[solved]numbers from a text file as variables that I can do calcs on
Hi, I'm a bit stuck on this. If I try to assign a variable as the result of a command output that parses a text file, and then try and use that variable later on eg. bc it doesn't work. The latest error gives me
(standard_in) 1: illegal character: ^M
So for example if I try to use awk to extract line 26, which looks like this:
50
and assign it to a variable "POINTS":
POINTS=$(cat blahblah.txt | awk "NR==26")
echo $POINTS
produces the output "50" as expected,
but when I try and multiply the output by 2:
NEWVALUE=$(echo "$POINTS * 2" | bc)
echo $NEWVALUE
Gives the illegal character error above. Strangely, if I put
POINTS=50
above the bc calculation line, it all works properly.
EDIT- FORGET IT
I think it's DOS format text crappy crap problem. Nevermind.
Oh, and I'll mark this solved after I've had my cup of tea. And after I've checked it really is solved of course...
Last edited by darkbeanies (2012-08-26 15:08:09)
yup, dos2unix fixed all problems. Hoorah!
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How to input data into an arraylist from a text file?
I am trying to take data from a text file and put that data into an arraylist. First here is the text file:
[item1, 10, 125.0, item2, 10, 12.0, item3, 20, 158.0]
3
4530.0
[item5, 65, 555.5, item4, 29, 689.0]
2
56088.5
[item7, 84, 34.5, item6, 103, 0.5, item8, 85, 1.36]
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3065.1The text between the [ ] is the output from my arraylists. I have three arraylists. The first [ ] belongs to arraylist A, the second to arraylist B, and the third to arraylist C. The format of the arraylists is this:
<item name>,<# in stock>,<value of one item>
The first number below the arraylists in the text file represents the number of items in the list. The second number below the arraylists represents the total value of the items in the arraylists.
Here is the class file I have (yes, it does everything):
import java.io.*;
import java.util.Scanner;
import java.util.ArrayList;
public class Inventory extends Object
public int toAdd = 0;
private boolean done = false; //Are we done yet?
public String strItemName; //The name of the item type.
public int intNumInStock; //The number in stock of that type.
public double dblValueOfOneItem; //The value of one item.
public String strNumberInStock;
public double dblTotalValueA; //The total value of warehouse A.
public double dblTotalValueB; //The total value of warehouse B.
public double dblTotalValueC; //The total value of warehouse C.
public int intWarehouseAItemCount; //Counter for items in warehouse A.
public int intWarehouseBItemCount; //Counter for items in warehouse B.
public int intWarehouseCItemCount; //Counter for items in warehouse C.
ArrayList warehouseAList = new ArrayList(); //Create the Warehouse A ArrayList.
ArrayList warehouseBList = new ArrayList(); //Create the Warehouse B arrayList.
ArrayList warehouseCList = new ArrayList(); //Create the Warehouse C arrayList.
/** Construct a new Inventory object. */
public Inventory()
super();
/**Add items to the Warehouse A ArrayList.*/
private void createWareHouseA()
System.out.println("!" + toAdd + " item types will be added to warehouse A.");
//Cast
String strNumInStock = Integer.toString(intNumInStock);
String strValueOfOneItem = Double.toString(dblValueOfOneItem);
this.strNumberInStock = strNumInStock;
System.out.println("!Initial size of warehouseAList : " +
warehouseAList.size());
//Add items to the array List
warehouseAList.add(this.strItemName);
warehouseAList.add(this.strNumberInStock);
warehouseAList.add(this.dblValueOfOneItem);
System.out.println("!size of arrayList after additions " + warehouseAList.size());
/**Add items to the Warehouse B ArrayList.*/
private void createWareHouseB()
System.out.println("!" + toAdd + " item types will be added to warehouse B.");
//Cast
String strNumInStock = Integer.toString(intNumInStock);
String strValueOfOneItem = Double.toString(dblValueOfOneItem);
this.strNumberInStock = strNumInStock;
System.out.println("!Initial size of warehouseBList : " +
warehouseBList.size());
//Add items to the array List
warehouseBList.add(this.strItemName);
warehouseBList.add(this.strNumberInStock);
warehouseBList.add(this.dblValueOfOneItem);
System.out.println("!size of arrayList after additions " + warehouseBList.size());
/**Add items to the Warehouse C ArrayList.*/
private void createWareHouseC()
System.out.println("!" + toAdd + " item types will be added to warehouse C.");
//Cast
String strNumInStock = Integer.toString(intNumInStock);
String strValueOfOneItem = Double.toString(dblValueOfOneItem);
this.strNumberInStock = strNumInStock;
System.out.println("!Initial size of warehouseCList : " +
warehouseCList.size());
//Add items to the array List
warehouseCList.add(this.strItemName);
warehouseCList.add(this.strNumberInStock);
warehouseCList.add(this.dblValueOfOneItem);
System.out.println("!size of arrayList after additions " + warehouseCList.size());
/**Interpret the commands entered by the user.*/
public void cmdInterpreter()
this.displayHelp();
Scanner cin = new Scanner(System.in);
while (!this.done)
System.out.print(">");
//"line" equals the next line of input.
String line = cin.nextLine();
this.executeCmd(line);
/**Execute one line entered by the user.
* @param cmdLN; The command entered by the user to execute. */
private void executeCmd(String cmdLN)
Scanner line = new Scanner(cmdLN);
if (line.hasNext())
String cmd = line.next();
//What to do when users enter the various commands below.
if (cmd.equals("help"))
this.displayHelp();
else if (cmd.equals("Q!"))
this.done = true;
else if (cmd.equals("F") && line.hasNext())
this.inputFromFile(line.next());
else if (cmd.equals("K") && line.hasNext())
int numItemsToAdd = Integer.valueOf( line.next() ).intValue();
this.toAdd = numItemsToAdd;
this.inputFromKeyboard(numItemsToAdd);
/**What to do if input comes from a file.
* @param inputFile; The name of the input file to process.*/
private void inputFromFile(String inputFile)
Scanner cin = new Scanner(System.in);
System.out.println("!Using input file " + inputFile + ".");
System.out.print("!Enter the name of the output file: ");
String outputFile = cin.next();
System.out.println("!Using output file " + outputFile + ".");
try
BufferedReader in = new BufferedReader(new FileReader(inputFile));
//Scanner in = new Scanner(new File(inputFile));
//Initialize the String variables.
String line1 = null;
String line2 = null;
String line3 = null;
String line4 = null;
String line5 = null;
String line6 = null;
String line7 = null;
String line8 = null;
String line9 = null;
System.out.println(in.equals(",") + " see?");
//System.out.println((char)(char)in.read() + " experiment");
/**This loop assigns values to the string variables based on the
* values on each line in the input file. */
while(in.readLine() != null)
line1 = in.readLine();
line2 = in.readLine();
line3 = in.readLine();
line4 = in.readLine();
line5 = in.readLine();
line6 = in.readLine();
line7 = in.readLine();
line8 = in.readLine();
line9 = in.readLine();
//Print the contents of each line in the input file.
System.out.println("!value of line 1: " + line1);
System.out.println("!value of line 2: " + line2);
System.out.println("!value of line 3: " + line3);
System.out.println("!value of line 4: " + line4);
System.out.println("!value of line 5: " + line5);
System.out.println("!value of line 6: " + line6);
System.out.println("!value of line 7: " + line7);
System.out.println("!value of line 8: " + line8);
System.out.println("!value of line 9: " + line9);
/**Add items to the warehouses.*/
warehouseAList.add(line1);
warehouseBList.add(line4);
warehouseCList.add(line7);
/**Add the item count and total value for warehouse A.*/
int intLine2 = Integer.valueOf(line2).intValue();
this.intWarehouseAItemCount = intLine2;
double dblLine3 = Double.valueOf(line3).doubleValue();
this.dblTotalValueA = dblLine3;
/**Add the item count and total value for warehouse B.*/
int intLine5 = Integer.valueOf(line5).intValue();
this.intWarehouseBItemCount = intLine5;
double dblLine6 = Double.valueOf(line6).doubleValue();
this.dblTotalValueB = dblLine6;
/**Add the item count and total value for warehouse C.*/
int intLine8 = Integer.valueOf(line8).intValue();
this.intWarehouseCItemCount = intLine8;
double dblLine9 = Double.valueOf(line9).doubleValue();
this.dblTotalValueC = dblLine9;
/**Ask the user how many items to add or delete from inventory.*/
System.out.print("Enter the number to add to inventory for " +
warehouseAList.get(0) + ":");
String toAddOrDel = cin.next();
/**Print the contents of all the warehouses. */
System.out.println(" ");
//Print the contents of warehouse A.
System.out.println("!--------------------------------");
System.out.println("!----------Warehouse A:----------");
System.out.println("!--------------------------------");
//Print the item list for warehouse A.
System.out.println(warehouseAList);
//Print the total amount of items in warehouse A.
System.out.println("Total items: " + this.intWarehouseAItemCount);
//Print the total value of the items in warehouse A.
System.out.println("Total value: " + this.dblTotalValueA);
System.out.println("!--------------------------------");
System.out.println("!----------Warehouse B:----------");
System.out.println("!--------------------------------");
//Print the item list for warehouse B.
System.out.println("!warehouseB: " + warehouseBList);
//Print the total amount of items in warehouse B.
System.out.println("Total items: " + this.intWarehouseBItemCount);
//Print the total value of the items in warehouse B.
System.out.println("Total value: " + this.dblTotalValueB);
System.out.println("!--------------------------------");
System.out.println("!----------Warehouse C:----------");
System.out.println("!--------------------------------");
//Print the item list for warehouse C.
System.out.println("!warehouseC: " + warehouseCList);
//Print the total amount of items in warehouse C.
System.out.println("Total items: " + this.intWarehouseCItemCount);
//Print the total value of the items in warehouse C.
System.out.println("Total value: " + this.dblTotalValueC);
in.close();
catch (FileNotFoundException e)
System.out.println("!Error: Unable to open file for reading.");
catch (EOFException e)
System.out.println("!Error: EOF encountered, file may be corrupted.");
catch (IOException e)
System.out.println("!Error: Cannot read from file.");
/**What to do if input comes from the keyboard.
* @param numItems; The total number of items that will be added to the
* Warehouse(s). */
public void inputFromKeyboard(int numItems)
System.out.println("!You will be adding " + numItems + " items to " +
"inventory from the keyboard. ");
this.toAdd = numItems;
Scanner cin = new Scanner(System.in);
//Prompt user for name of output file.
System.out.print("!Enter the name of the output file: ");
String outputFile = cin.next();
/**This loop asks the user for information about the item(s) and inputs
*them into the appropriate array.*/
int count = 0;
while (numItems > count)
//Item name.
System.out.print("!Item name: ");
String addItemName = cin.next();
//Number in stock.
System.out.print("!Number in stock: ");
String addNumInStock = cin.next();
//Initial warehouse.
System.out.print("!Initial warehouse(A,B,C): ");
String addInitWarehouse = cin.next();
//Value of one item.
System.out.print("!Value of one item: ");
String addValueOfOneItem = cin.next();
//Add or delete from inventory
System.out.print("!Enter amount to add or delete from inventory: ");
String strAddOrDelete = cin.next();
System.out.println("!Amount to add or delete: " + strAddOrDelete);
//Cast
int intAddNumInStock = Integer.valueOf(addNumInStock).intValue();
double doubleAddValueOfOneItem = Double.valueOf(addValueOfOneItem).doubleValue();
int intAddOrDelete = Integer.valueOf(strAddOrDelete).intValue();
/**Add intAddNumInStock with intAddOrDelete to determine the amount
* to add or delete from inventory (If a user wishes to remove items
* from inventory simply add negative values). */
intAddNumInStock = intAddNumInStock + intAddOrDelete;
System.out.println("!Inventory after modifications: " + strAddOrDelete);
this.strItemName = addItemName;
this.intNumInStock = intAddNumInStock;
this.dblValueOfOneItem = doubleAddValueOfOneItem;
//Put items into warehouse A if appropriate.
if (intAddNumInStock < 25)
//Increment the warehouse A item count.
this.intWarehouseAItemCount = this.intWarehouseAItemCount + 1;
//Calculate the total value of warehouse A.
this.dblTotalValueA = this.dblTotalValueA + intAddNumInStock * doubleAddValueOfOneItem;
//Create the warehouse A array list.
this.createWareHouseA();
//Put items into warehouse B if appropriate.
if (intAddNumInStock >= 25)
if (intAddNumInStock < 75)
//Increment the warehouse B item count.
this.intWarehouseBItemCount = this.intWarehouseBItemCount + 1;
//Calculate the total value of warehouse B.
this.dblTotalValueB = this.dblTotalValueB + intAddNumInStock * doubleAddValueOfOneItem;
//Create the warehouse B array list.
this.createWareHouseB();
//Put items into warehouse C if appropriate.
if (intAddNumInStock >= 75)
//Increment the warehouse C item count.
this.intWarehouseCItemCount = this.intWarehouseCItemCount + 1;
//Calculate the total value of warehouse C.
this.dblTotalValueC = this.dblTotalValueC + intAddNumInStock * doubleAddValueOfOneItem;
//Create the warehouse C array list.
this.createWareHouseC();
//display helpful information.
System.out.println("!--------------------------------");
System.out.println("!" + addItemName + " is the item name.");
System.out.println("!" + addNumInStock + " is the number in stock.");
System.out.println("!" + addInitWarehouse + " is the initial warehouse.");
System.out.println("!" + addValueOfOneItem + " is the value of one item.");
System.out.println("!--------------------------------------------------");
//Increment the counters.
count++;
/**Create and write to the output file. */
try
//Use the output file specified by the user.
PrintWriter out = new PrintWriter(outputFile);
/**Write warehouse A details.*/
//Blank the first line.
out.println(" ");
//Write the array list for warehouse A.
out.println(warehouseAList);
//Write the amount of items in warehouse A.
out.println(intWarehouseAItemCount);
//Write the total value for warehouse A.
out.println(dblTotalValueA);
/**Write warehosue B details.*/
//Write the array list for warehouse B.
out.println(warehouseBList);
//Write the amount of items in warehouse B.
out.println(intWarehouseBItemCount);
//Write the total value for warehouse B.
out.println(dblTotalValueB);
/**Write warehouse C details.*/
//Write the array list for warehouse C.
out.println(warehouseCList);
//Write the amount of items in warehouse C.
out.println(intWarehouseCItemCount);
//Write the total value for warehouse C.
out.println(dblTotalValueC);
//Close the output file.
out.close();
catch (FileNotFoundException e)
System.out.println("Error: Unable to open file for reading.");
catch (IOException e)
System.out.println("Error: Cannot read from file.");
/**View the contents and the value of each warehouse.*/
System.out.println("!---------------Inventory Summary------------------");
System.out.println("!--------------------------------------------------");
System.out.println("!--------------------LEGEND:-----------------------");
System.out.println("!<item type>, <amount in stock>,<value of one item>");
System.out.println("!--------------------------------------------------");
System.out.println("!------------------Warehouse A:--------------------");
System.out.println("!--------------------------------------------------");
//Display Items in warehouse A.
System.out.println(warehouseAList);
//Total items in warehouse A.
System.out.println("Total items: " + intWarehouseAItemCount);
//Display total value of warehouse A.
System.out.println("Total value: " + "$" + dblTotalValueA);
System.out.println("!--------------------------------------------------");
System.out.println("!------------------Warehouse B:--------------------");
System.out.println("!--------------------------------------------------");
//Display Items in warehouse B.
System.out.println(warehouseBList);
//Total items in warehouse B.
System.out.println("Total items: " + intWarehouseBItemCount);
//Display total value of warehouse B.
System.out.println("Total value: " + "$" + dblTotalValueB);
System.out.println("!--------------------------------------------------");
System.out.println("!------------------Warehouse C:--------------------");
System.out.println("!--------------------------------------------------");
//Display Items in warehouse C.
System.out.println(warehouseCList);
//Total items in warehouse C.
System.out.println("Total items: " + intWarehouseCItemCount);
//Display total value of warehouse C.
System.out.println("Total value: " + "$" + dblTotalValueC);
/**Display a help message.*/
private void displayHelp()
System.out.println("!--------------------------------");
System.out.println("! General Help:");
System.out.println("!--------------------------------");
System.out.println("! ");
System.out.println("!'help' display this help message.");
System.out.println("!'Q!' quit this program.");
System.out.println("!--------------------------------");
System.out.println("! Input File Specific Commands:");
System.out.println("!--------------------------------");
System.out.println("! ");
System.out.println("!'F' <name> type F followed by the name of the " +
"file to be used for input.");
System.out.println("!---------------------------------------");
System.out.println("! Input From Keyboard Specific Commands:");
System.out.println("!---------------------------------------");
System.out.println("! ");
System.out.println("!'K' <number> type K followed by the number of " +
"items that will be added. ");
System.out.println("! ");
}Program file:
public class InventoryProg
public static void main(String[] args)
//Create a new Inventory object.
Inventory test = new Inventory();
//Execute the command interpreter.
test.cmdInterpreter();
}Right now I am stuck on this and I cannot progress any further until I figure out how to input the data in the text file back into a arraylist.
Thanks in advance.Thanks but I figured it out. Heres a sample of the code i used to solve my problem:
try
//Warehouse A BufferedReader.
BufferedReader inA = new BufferedReader(new FileReader(inputFileWarehouseA));
//Warehouse B BufferedReader.
BufferedReader inB = new BufferedReader(new FileReader(inputFileWarehouseB));
//Warehouse C BufferedReader.
BufferedReader inC = new BufferedReader(new FileReader(inputFileWarehouseC));
//Warehouse details BufferedReader.
BufferedReader inDetails = new BufferedReader(new FileReader(inputFileDetails));
//Will hold values in warehouse arraylists.
String lineA = null;
String lineB = null;
String lineC = null;
//Will hold the details of each warehouse.
String line1 = null;
String line2 = null;
String line3 = null;
String line4 = null;
String line5 = null;
String line6 = null;
//Get the item count and total value for each warehouse.
while(inDetails.readLine() != null)
line1 = inDetails.readLine();
line2 = inDetails.readLine();
line3 = inDetails.readLine();
line4 = inDetails.readLine();
line5 = inDetails.readLine();
line6 = inDetails.readLine();
/**Assign the item count and total value to warehouse A.*/
//Cast.
int intLine1 = Integer.valueOf(line1).intValue();
double dblLine2 = Double.valueOf(line2).doubleValue();
//Assign the values.
this.intWarehouseAItemCount = intLine1;
this.dblTotalValueA = dblLine2;
/**Assign the item count and total value to warehouse B.*/
//Cast.
int intLine3 = Integer.valueOf(line3).intValue();
double dblLine4 = Double.valueOf(line4).doubleValue();
//Assign the values.
this.intWarehouseBItemCount = intLine3;
this.dblTotalValueB = dblLine4;
/**Assign the item count and total value to warehouse C.*/
//Cast.
int intLine5 = Integer.valueOf(line5).intValue();
double dblLine6 = Double.valueOf(line6).doubleValue();
//Assign the values.
this.intWarehouseCItemCount = intLine5;
this.dblTotalValueC = dblLine6;
/**Put the items back into the warehouses arraylists. */
//Add items to warehouse A.
while((lineA = inA.readLine()) != null)
warehouseAList.add(lineA);
//Add items to warehouse B.
while((lineB = inB.readLine()) != null)
warehouseBList.add(lineB);
//Add items to warehouse C.
while((lineC = inC.readLine()) != null)
warehouseCList.add(lineC);
}(this isn't the whole try statement its pretty long) -
Reading from a text file in to an array, help please
I have the following
public class date extends Loans{
public int dd;
public int mm;
public int yyyy;
public String toString() {
return String.format( "%d,%d,%d", mm, dd, yyyy );
public class Loans extends Borrowing {
public String name;
public String book;
public date issue;
public char type;
public String toString(){
return String.format( "%s, %s, %s, %s", name, book, issue, type );
import java.util.Scanner;
import java.io.*;
public class Borrowing extends BorrowingList {
private Loans[] Loaned = new Loans[20];
if i want to read in from a text file in to that array how do i do it?sorry to keep bothering you and thanks loads for your help but now I am getting the following error mesage
C:\Documents and Settings\MrW\Menu.java:43: cannot find symbol
symbol : class IOException
location: class Menu
}catch(IOException e){
Note: C:\Documents and Settings\MrW\Borrowing.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
BUILD FAILED (total time: 0 seconds)
for this line
}catch(IOException e){ -
At end of tether! Reading in variables from a text file
Hi all
My stress factor has gone through the roof because I am trying to read in from a text file (you may have seen some earlir questions about ArrayLists) it's just not working!
The code is below. The result is that it's reading in all of the car data, none of the motorbike and only the first line for the services. It's odd and it's driving me insane!
Here's an example of the data it's reading. There are about 7-10 sets of data per type
<car><reg>AB04CDE</reg><make>Ford</make><model>Fiesta</model><colour>blue</colour><passenger_no>4</passenger_no></car>
<service><service_no>13570</service_no><reg>J605PLE</reg><date>15:07:2006</date><miles>20000</miles><part_replaced>brake_pads</part_replaced><part_replaced>front_tyres</part_replaced></service>
<motorbike><reg>TT05EKJ</reg><make>Triumph</make><model>Speedmaster</model><colour>black</colour><load>20.50</load></motorbike>
Here's the code
while (moreToRead) {
String line;
try {
line = fileReader.getNextStructure();
// collect the data from the file
if (line.indexOf("<car>")> -1){
// Select/Extract the registration element
int nStart = line.indexOf("<reg>");
int nEnd = line.indexOf("</reg>");
String reg = line.substring(nStart+5,nEnd);
// Select/Extract the make element
nStart = line.indexOf("<make>");
nEnd = line.indexOf("</make>");
String make = line.substring(nStart+6,nEnd);
// Select/Extract the model element
nStart = line.indexOf("<model>");
nEnd = line.indexOf("</model>");
String model = line.substring(nStart+7,nEnd);
// Select/Extract the colour element
nStart = line.indexOf("<colour>");
nEnd = line.indexOf("</colour>");
String colour = line.substring(nStart+8,nEnd);
// Select/Extract the passenger_no element
nStart = line.indexOf("<passenger_no>");
nEnd = line.indexOf("</passenger_no>");
String passenger_no = line.substring(nStart+14,nEnd);
//convert string to int
int passengerInt = Integer.parseInt(passenger_no);
// declare new object car and assign the variables then add it to the array.
Car c = new Car (reg, make, model, colour, passengerInt);
carList.add(c);
} else if (line.indexOf("<bike>")> -1) {
// Select/Extract the registration element
int nStart = line.indexOf("<reg>");
int nEnd = line.indexOf("</reg>");
String reg = line.substring(nStart+5,nEnd);
// Select/Extract the make element
nStart = line.indexOf("<make>");
nEnd = line.indexOf("</make>");
String make = line.substring(nStart+6,nEnd);
// Select/Extract the model element
nStart = line.indexOf("<model>");
nEnd = line.indexOf("</model>");
String model = line.substring(nStart+7,nEnd);
// Select/Extract the colour element
nStart = line.indexOf("<colour>");
nEnd = line.indexOf("</colour>");
String colour = line.substring(nStart+8,nEnd);
// Select/Extract the load element
nStart = line.indexOf("<load>");
nEnd = line.indexOf("</load>");
String load = line.substring(nStart+6,nEnd);
//convert load string to double
double bikeLoad = Double.parseDouble(load);
// declare new object motorbike and assign the variables then add it to the array.
Motorbike m = new Motorbike (reg, make, model, colour, bikeLoad);
bikeList.add(m);
} else {
// Select/Extract the service_number element
int nStart = line.indexOf("<service_no>");
int nEnd = line.indexOf("</service_no>");
String service_no = line.substring(nStart+12,nEnd);
console.println("service = " + service_no);
nStart = line.indexOf("<reg>");
nEnd = line.indexOf("</reg>");
String reg = line.substring(nStart+5,nEnd);
console.println("service = " + reg);
nStart = line.indexOf("<date>");
nEnd = line.indexOf("</date>");
String date = line.substring(nStart+6,nEnd);
console.println("service = " + date);
nStart = line.indexOf("<miles>");
nEnd = line.indexOf("</miles>");
String miles = line.substring(nStart+7,nEnd);
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nStart = line.indexOf("<part_replaced>");
nEnd = line.indexOf("</part_replaced>");
String part_replaced = line.substring(nStart+15,nEnd);
console.println("service = " + part_replaced);
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int dateOfService = Integer.parseInt(date);
//convert string to double
double milesAtService = Double.parseDouble(miles);
//convert service no to unique int
int serviceNo = Integer.parseInt(service_no);
// declare new object service and assign the variables then add it to the array.
Service s = new Service (reg, part_replaced, serviceNo, dateOfService, milesAtService);
serviceList.add(s);
catch (Exception e) {
// Run out of data
moreToRead = false;
} If anyone can spy anything that could be causing this I love your advice. I simply can't see it.
Johi jos,
we have been asked not to use a parser for this assignment. evil
tutor i think! lolYour example seems to imply that all the <tag> ... </tag> pairs have
to occur on a single line; if that is so, you can do some cheap
programming like this:String getText(String line, String tag) {
int start= line.indexOf("<"+tag+">");
int end= line.indexOf("</"+tag+">", start);
if (start < 0 || end < 0) return null; // no <tag> ... </tag> pair found
// return the text in between the <tag> ... </tag> tags
return line.substring(start+tag.length()+2, end);
}kind regards,
Jos -
Importing a text file with variable values into web reporting
Hello,
I'm looking for a possibility to import values from a text file into a variable selection in Web reporting.
With BEx reporting in Excel this is possible, by clicking on the multiple selection button in the variable popup screen, and subsequently selecting the "Import from Text file" button.
However, this function seems not to be available for web-reporting...
It would be great if someone could help me out with this!
Thanks & regards,
ArvidHi,
we could resolve this issue, so i thought it may also be helpful for others:
In our example we used a file with numbers for materials. This file is stored somewhere in a directory, to which SAP BI must have authorization to read.
The file looks something like this:
4711
4712
4713
4714
The file is named "import.txt" and lays in directory "/usr/sap/EC6/files/bi/"
*& Include ZXRSRU01
* global variables
Data: intern_range LIKE LINE OF i_t_var_range,
l_s_range TYPE rsr_s_rangesid,
line(100) TYPE c,
p_file(128) TYPE c,
length_rangelow type i,
tmp_rangelow like l_s_range-low.
* internal tables for selection-transfer from transaction
* Data: BEGIN OF it_file occurs 0,
* it_p_file(128) TYPE c,
* END of it_file.
IF i_step = 1.
** variables can be changed or set before pop-up appears
CASE i_vnam.
* take material from external file to selection-list
WHEN 'ZSD_UPMA'.
** call of transaction, with which the path can be set
*CALL TRANSACTION 'ZBW_VARIABLE' using it_file
*MODE 'A' " call should be visible, so that variable can be set
*UPDATE 'S'. " first transaction, then processing
** Der Pfad, der in dem Selektionsbild eingegeben wird, wird an die Variable übergeben
** Der Set-Parameter ist in Report ZSD_SELECT_VARIABLE
* get parameter id 'VAR' field p_file.
p_file = '/usr/sap/EC6/files/bi/import.txt'.
* further handling of variable in BI
OPEN DATASET p_file FOR INPUT IN TEXT MODE ENCODING DEFAULT.
IF sy-subrc = 0.
READ DATASET p_file INTO line.
WHILE sy-subrc = 0.
IF line(2) <> '//'.
l_s_range-sign = 'I'.
l_s_range-opt = 'EQ'.
l_s_range-low = line.
* fill with leading Zeros
* in variable tmp_rangelow the value from l_s_range-low is taken
tmp_rangelow = l_s_range-low.
* read the length
length_rangelow = strlen( tmp_rangelow ).
* in our case: material has 18 characters
while length_rangelow lt 18.
CONCATENATE '0' tmp_rangelow INTO tmp_rangelow.
length_rangelow = length_rangelow + 1.
endwhile.
* initialize l_s_range-low
clear l_s_range-low.
* set with filled values
l_s_range-low = tmp_rangelow.
* transfer to structure
APPEND l_s_range TO e_t_range.
ENDIF.
READ DATASET p_file INTO line.
ENDWHILE.
ENDIF.
CLOSE DATASET p_file.
ENDCASE.
ELSEIF i_step = 2.
** in step 2 all variable values from pop-up input can be processed or
** User Exit variables can be derived
* UserExit Ende.
ENDIF.
Hope i could help!
Best regards,
Tobias -
Reading signed interger from a text file:
Is this possible with some construct in java? Attempting to read a signed number using .readInt() throws an exception before the first token is a malformed int. i,e, the sign + or -.
I would like to read a signed integer from a text file but I am clueless.
Any help is appreciated.It can be a bit of a dilemma for lexical analysers. Say you read "a + 12" then you'd generally want to process that as three separate lexemes. The monadic form of plus is less common than the monadic minus.
A quick test shows that "+12" and "+ 12" are both rejected by Integer.parseInt() (which surprised me).
I'd suggest if you want to read positive numbers then first analyse your input using a regular expression, for example "\\s*([-+]?)\\s*(\\d+)" followed by
(matcher.match(1).equals("-") ? -1 : 1) * Integer.parseInt(matcher.match(2));Edited by: malcolmmc on May 24, 2010 2:10 PM -
Read one word at a time from a text file
I want to read one word at a time from a text file as it is done by "scanf &s" function in text based programme. It is not possible by " read from text" function. Suggest me function or method to solve this.
The simplest way is to use the spreadsheet string to array function with the space character as the delimiter.
Note that this won't work unless there is a space character between the words - it won't work with line feeds / carriage returns between the words but you could always split the string into lines first. You may also want to trim whitespace to remove any other non-visible characters (e.g. tab, line feeds) from around the word.
If you need something more sophisticated that splits based on whitespace (e.g. tab, new line) then you'll probably need to do something with searching the string for these characters (e.g. using a regular expression) and then splitting them yourself into an array.
Of course...if you actually want to just read one word at a time from the file rather than just split the file into words (I assumed you meant this), you will need to read the file byte by byte using the low level file IO functions, build a buffer of the bytes and check the character you've read to see if it a space.
Certified LabVIEW Architect, Certified TestStand Developer
NI Days (and A&DF): 2010, 2011, 2013, 2014
NI Week: 2012, 2014
Knowledgeable in all things Giant Tetris and WebSockets -
How to read some lines from a text file using java.
hi,
i m new to java and i want to read some lines from a text file based on some string occurrence in the file. This file to be read in steps.
we only want to read the file upto the first Occurrence of "TEXT" string.
How to do it ,,,
Kinldy give the code
Regards,
Sagar
this is the text file
dfgjdjj
sfjhjkd
ghjkdg
hjkdgh TEXT
ikeyt
ujt
jk
tyk TEXT
rukl
rHendawy wrote:
Since the word "TEXT" is formed of 4 letters, you would read the text file 4 bytes by four bytes. Wrong on two counts. First, the file may not be encoded 1 byte per character. It could be utf-16 in which case it would be two byte per character. Second, even if it were 1 byte per character, the string "Text" may not start on a 4 byte boundary.
Consider a FileInputStream object "fis" that points to your text file. use fis.read(byte[] array, int offset, int len) to read every four bytes. Convert the "TEXT" String into a byte array "TEXT".getBytes(), and yous the Arrays class to compare the equality of the read bytes with your "TEXT".getBytes()Wrong since it relies on my second point and will fail when fis.read(byte[] array, int offset, int len) does not read 4 bytes (as is no guaranteed to). Check the Javadoc. Also, the file may not be encoded with the default character encoding.
The problem is easily solved by reading a line at a time using a BufferedReader wrapping an InputStreamReader wrapping a FileInputStream and specifying the correct character encoding.
Edited by: sabre150 on Apr 29, 2009 2:13 PM -
Getting repeated values when reading from a text file.
I need to read from a text file. When the token encounters a particular word (command) I need to read the next line and perform some actions. However, this part is working but it is repeating the values again and again until it encounters the next particular word (command). Hope that someone will help me out, as always when I posted a problem in these forums.
SetOperations class - contains the set methods
// Imported packages.========================================================
import java.util.Vector;
import java.util.Iterator;
// Public class SetOperations.===============================================
public class SetOperations
// Instance variables.===================================================
private Vector v = null; // Creates new instance of vector.
protected int memberCount;
// Constructor.==========================================================
public SetOperations()
v = new Vector();
} // end constructor.
// Method isMember.======================================================
* Checks whether the element is already a member of the set.
* @return True if Vector v contains Object member.
public boolean isMember(Object member)
if (member != null) // only if Object member is not null.
return v.contains(member); // returns true if vector already contains member.
else
return false; // returns false if vector does not contain member.
} // end public boolean isMember(Object member).
// Method addMember.=====================================================
* Adds a member to the set.
* @return Adds Object member to Vector v.
public void addMember(Object member)
//if (! v.contains(member)) // only if element is not already a member.
if (isMember(member) == false) // only if element is not already a member.
v.add(member); // adds a member.
} // end public void addMember(Object member).
// Method countMember.===================================================
* Returns the number of members present in the vector.
* @return Number of elements present in the vector.
public int countMember()
return v.size();
} // end public int countMember().
// Method isSetEmpty.====================================================
* Returns true if set is empty.
* @return True if no elements are present in Vector v.
public boolean isSetEmpty()
return v.size() == 0; // returns 0 if no elements are present in the vector.
} // end of public boolean isSetEmpty().
// Method printMember.===================================================
* Displays member/s of the set.
* @return Prints element/s present in the vector.
public void printMember()
for (int i = 0; i < v.size(); i++) // iterates through present members.
System.out.println("[" + i + "] " + v.get(i)); // displays member/s present in the vector.
} // end of public void printMember().
} // end public class SetOperations.
SetTextLauncher class - reads from a text file and implements the set operations
// Imported packages.========================================================
import java.util.*;
import java.io.*;
// Public class SetTestLauncher.=============================================
public class SetTestLauncher
// Main method public static void main(String args[]).===================
public static void main(String args[])
displayFile("test.txt"); // outputs result from text file.
// method to display a file on screen
public static void displayFile (String textFile)
// Instance variables.===============================================
// Creates new instances of SetOperations.
SetOperations setA = new SetOperations();
SetOperations setB = new SetOperations();
SetOperations setC = new SetOperations();
SetOperations setD = new SetOperations();
SetOperations setE = new SetOperations();
// Initialisation.
String line = "", nextLine = "";
FileReader fr = null;
try
// Opens the file with the FileReader data sink stream.
fr = new FileReader(textFile);
// Converts the FileReader input stream with the BufferedReader processing stream.
BufferedReader br = new BufferedReader(fr);
// Iterates through text file reading lines until end of text lines.
while (line != null)
line = br.readLine(); // reads one line at a time.
if(line == null) break; // when the line is null break the loop.
// Creates a new instace of StringTokenizer.
StringTokenizer st = new StringTokenizer(line);
// Loops until there are no more tokens.
while (st.hasMoreTokens())
String token = st.nextToken(); // reads next token.
// Only if the token encounters the String "membera".
if(token.equals("membera"))
nextLine = br.readLine(); // gets next line.
setA.addMember(nextLine); // adds a member to the set.
// Displays members present in the set if vector is not empty.
if (! setA.isSetEmpty())
setA.printMember(); // print members present.
// Displays the number of member/s present in the vector.
System.out.println("Number of set members: " + setA.countMember());
// Catches and displays exceptions.
catch (FileNotFoundException exp)
System.out.println(exp.getMessage());
exp.printStackTrace();
catch (IOException exp)
System.out.println(exp.getMessage());
exp.printStackTrace();
finally
try
// if file is found
if (fr != null)
// close file
fr.close();
catch (IOException exp)
exp.printStackTrace();
} // end public static void main(String args[]).
} // end public class SetTestLauncher.Thanks for your interest. Please ignore SetOperations class, it is just the class containing the methods and it works correctly since I checked it without reading from a text file. I marked the part where I think lies my problem in class SetTestOperations.
The information in the text file is as follows:
membera
Hillman
membera
Skoda
membera
Honda
membera
Toyota
and the result is:
[0] Hillman
Number of set members: 1
[0] Hillman
[1] Skoda
Number of set members: 2
[0] Hillman
[1] Skoda
[2] Honda
Number of set members: 3
[0] Hillman
[1] Skoda
[2] Honda
[3] Toyota
Number of set members: 4
instead of just one set:
[0] Hillman
[1] Skoda
[2] Honda
[3] Toyota
Number of set members: 4
Hope it is easier to understand like this.
Regards
Marco
I need to read from a text file. When the token
encounters a particular word (command) I need to read
the next line and perform some actions. However, this
part is working but it is repeating the values again
and again until it encounters the next particular
word (command). Hope that someone will help me out,
as always when I posted a problem in these forums.
SetOperations class - contains the set
methods
// Imported
packages.=============================================
===========
import java.util.Vector;
import java.util.Iterator;
// Public class
SetOperations.========================================
=======
public class SetOperations
// Instance
e
variables.============================================
=======
private Vector v = null; // Creates new instance of
f vector.
protected int memberCount;
Constructor.==========================================
================
public SetOperations()
v = new Vector();
} // end constructor.
// Method
d
isMember.=============================================
=========
* Checks whether the element is already a member of
f the set.
* @return True if Vector v contains Object member.
public boolean isMember(Object member)
if (member != null) // only if Object member is not
ot null.
return v.contains(member); // returns true if
if vector already contains member.
else
return false; // returns false if vector does not
not contain member.
} // end public boolean isMember(Object member).
// Method
d
addMember.============================================
=========
* Adds a member to the set.
* @return Adds Object member to Vector v.
public void addMember(Object member)
//if (! v.contains(member)) // only if element is
is not already a member.
if (isMember(member) == false) // only if element
nt is not already a member.
v.add(member); // adds a member.
} // end public void addMember(Object member).
// Method
d
countMember.==========================================
=========
* Returns the number of members present in the
e vector.
* @return Number of elements present in the vector.
public int countMember()
return v.size();
} // end public int countMember().
// Method
d
isSetEmpty.===========================================
=========
* Returns true if set is empty.
* @return True if no elements are present in Vector
r v.
public boolean isSetEmpty()
return v.size() == 0; // returns 0 if no elements
ts are present in the vector.
} // end of public boolean isSetEmpty().
// Method
d
printMember.==========================================
=========
* Displays member/s of the set.
* @return Prints element/s present in the vector.
public void printMember()
for (int i = 0; i < v.size(); i++) // iterates
es through present members.
System.out.println("[" + i + "] " + v.get(i)); //
// displays member/s present in the vector.
} // end of public void printMember().
} // end public class SetOperations.
SetTextLauncher class - reads from a text file
and implements the set operations
// Imported
packages.=============================================
===========
import java.util.*;
import java.io.*;
// Public class
SetTestLauncher.======================================
=======
public class SetTestLauncher
// Main method public static void main(String
g args[]).===================
public static void main(String args[])
displayFile("test.txt"); // outputs result from
om text file.
// method to display a file on screen
public static void displayFile (String textFile)
// Instance
ce
variables.============================================
===
// Creates new instances of SetOperations.
SetOperations setA = new SetOperations();
// Initialisation.
String line = "", nextLine = "";
FileReader fr = null;
try
// Opens the file with the FileReader data sink
ink stream.
fr = new FileReader(textFile);
// Converts the FileReader input stream with the
the BufferedReader processing stream.
BufferedReader br = new BufferedReader(fr);
// Iterates through text file reading lines until
til end of text lines.
while (line != null)
line = br.readLine(); // reads one line at a
at a time.
if(line == null) break; // when the line is null
null break the loop.
// Creates a new instace of StringTokenizer.
StringTokenizer st = new StringTokenizer(line);
// Loops until there are no more tokens.
while (st.hasMoreTokens())
String token = st.nextToken(); // reads next
next token.
// Only if the token encounters the String
tring "membera".
if(token.equals("membera"))
// *****THE PROBLEM LIES HERE....I GUESS
// need to read the next line after encountering the word membera in text file
nextLine = br.readLine(); // gets next line.
setA.addMember(nextLine); // adds a member to
ber to the set.
// Displays members present in the set if
set if vector is not empty.
if (! setA.isSetEmpty())
setA.printMember(); // print members present.
// Displays the number of member/s present in
ent in the vector.
System.out.println("Number of set members: " +
s: " + setA.countMember());
// Catches and displays exceptions.
catch (FileNotFoundException exp)
System.out.println(exp.getMessage());
exp.printStackTrace();
catch (IOException exp)
System.out.println(exp.getMessage());
exp.printStackTrace();
finally
try
// if file is found
if (fr != null)
// close file
fr.close();
catch (IOException exp)
exp.printStackTrace();
} // end public static void main(String args[]).
} // end public class SetTestLauncher. -
How do i read complete line from a text file in j2me?????
how do i read complete line from a text file in j2me????? I wanna read file line by line not char by char..Even i tried with readUTF of datainputstream to read word by word but i got UTFDataFormatException.. Please solve my problem.. Thanks in advance..
That is not my problem . i already read it char by char.. i am getting complete line..But this process is taking to much time..So thats why i directly wanna read complete line or word to save time..
-
Average Data from multiple text files
I am new to labVIEW hence a little help is appreciated:
I have a 100 txt files with two columns (tab separated) for X and Y value.
I need to average the Y values to generate one single txt file and generate X versus Y graph.
So how do I read the data from these text files? (without having to select each one of them individually) and how to average the data and create a XY graph from it?
Thanks in advance
Solved!
Go to Solution.Use X-Y Graph.
You were able to get two arrays of X and Y points from text file right?
Gaurav k
CLD Certified !!!!!
Do not forget to Mark solution and to give Kudo if problem is solved. -
Reading data from a text file into PAS - Dimension member names truncated
Hi,
I created a procedure to dump variables and data into a text file to load into another model. I used a semicolon as a field seperator.
The data, measures and dimension members are dumped properly into a text file and no dimension member names are truncated .
However when I read the data into a measure, and I issue a peek command, dimension meber names are read in truncated
and remain full names in the text file. Any reason for this? What do I need to do to prevent this from happening?
THanks.
LungileHi Lungile,
The problem that you're likely having is that you haven't created a file description for the file from which you're reading. When loading data into Application Server from a text file, you would normally go through three steps:
1. Enter the ACCESS EXTERNAL subsystem
2. Specify the name of the file to be read
3. Specify the format of the file field names, types, widths, and positions.
If you go into the Application Server help, select "Application Server Help", then "Application Server at the command level", then "Variables and reading in data", and then "Reading an external file", you will have the process of the steps you need to follow outlined for you, including links to the help topic for each command you need to issue.
So what I think you need to do is use the DESCRIPTION command to specify the names of your fields, their type, and also their width, in order to ensure no truncation of data on the load.
The same DESCRIPTION statement is required if you want to use your text file as the source of a dimension.
Hope this helps,
Robert -
Reading fields from a text file
Hi, I'm fairly new to this so bear with me.
This is for an assignment - the idea is to cretae an online system for booking seats at a cinema - haven't got past the login stage yet?
I've got an applet that needs to read in a field from a text file.
I'm using the StringTokenizer function.
I've put a test in to check that the applet can find the file, which seems to be ok.
However, it's not reading from the file.
Te file is a simple text file - fields are seperated by a comma and a space.
Any ideas?
Please help as this is quite urgent.
Prototype Code is below
public class cinema extends Applet implements ActionListener, ItemListener{
private List ActionList;
private int listIndex;
TextArea t = new TextArea(5, 30);
private Button gobutton, writebutton, login, logout;
private PrintWriter suggestfile;
TextField Userid, password, enterField;
private int count, checkuser;
private BufferedReader firstn;
File myFile = new File("e:\\Ian\\Unistuff\\2nd Year\\se2\\cinema2\\src\\cinema2\\member.txt");
//Construct the applet
public cinema() {
enterField = new TextField("Please enter user ID and Password");
enterField.setEditable(false);
add(enterField);
Userid = new TextField(3);
add(Userid);
password = new TextField(10);
password.setEchoChar('*');
add(password);
//Initialize the applet
public void init() {
BorderLayout borderLayout1 = new BorderLayout();
//some code ommitted
t.setEditable(false);
add(t);
gobutton = new Button("Go!");
add(gobutton);
gobutton.addActionListener(this);
public void actionPerformed(ActionEvent event) {
if (event.getSource() == gobutton) {
try {
firstn = new BufferedReader( new FileReader(myFile));
catch (IOException e) {
t.setText("Member database missing - please contact Chairperson");
return;
try {
String line1;
boolean found = false;
while (( ( line1 = firstn.readLine() ) != null) && (! found))
{StringTokenizer token1 = new StringTokenizer (line1, " ,");
String user = token1.nextToken();
if (Userid.getText().equals(user))
{ found = true;
t.setText("Hello");
firstn.close();
catch (IOException e) {
System.err.println("Error Reading File " + myFile + ": " + e.toString());
Here's the text file:
Ian, Dodson, 001, rubbish
Joe, Bloggs, 002, medway
Bill, Smith, 003, unique
Guest, , Guest,
To test that it is working, it should just put a message in the Text Area, but nothing happens when you press the "go" button.1. Your applet will not work, because it is trying to
read file from local disk.
2. This task can be solved by simple CGI script
(which is much more common and universal thing than
java), so you do not need to use java if you want to
send 3 lines to a server.
3. See examples and read some books.1. Stated the obvious.
2. This is a java forum, not Perl.
3. Pathetic and patronizing.
Very helpful. -
How to execute code from a text file?
Hello all!
How to execute some code lines from a text file? For example my file is:
String varname = "somecontents";
JFrame frame = new JFrame();
frame.setVisible(true);How can I get contents of this file and parse them if I want get new JFrame and access to the variable varname?I mean the PHP would generate a readable Java source,
for example some variables with some data, and I just
dont know what to do with file if I want generate the
xls file from my saved data, could You help? :)Some variables, some data, PHP, Java, XLS file??? Al rather vague.
You need to explain in more detail what it is you're trying to do if you want an answer to your question! -
Populating a form from a text file
I have an Oracle form which schedules students into courses. The form collects the student id, name, school, and course code. A "RUN" button then does the scheduling. The form is not a table, meaning the data is not all stored together in an Oracle table. The user currently has to manually enter each piece of information before a student can be scheduled. I would like to be able to auto populate this form/screen with data from a text file. I cannot use SQL Loader since the data is not going into a table. Is there a way to take my text file and make it appear on the form/screen when the form opens? Then my user just has to click the RUN button in order to schedule the students instead of hand entering all the data.
Any help on this would be greatly appreciated!
-NTWhi
USING THE TEXT_IO PACKAGE
Abstract: This document describes the functionality of the TEXT_IO
package and explains how to use it to access the file
system effectively.
Keywords: TEXT_IO;FILE;IO;PACKAGE
Using the TEXT_IO Package
=========================
Oracle Procedure Builder, "an integrated, interactive environment for
PL/SQL", is shipped with several built-in packages which, if used
properly, can greatly boost development productivity. These built-in
packages are not installed as extensions to the STANDARD package;
hence, when you reference a construct from any of these packages, you
must prefix the package name to the construct.
TEXT_IO provides constructs that allow programmers to read information
from and write information to a file system. The procedures and
functions in TEXT_IO fall into the following three categories:
Category 1: File Operations
FILE_TYPE - Declares a file type variable as a handle to the file being
processed.
Syntax: TEXT_IO.FILE_TYPE;
FOPEN - Opens a file and returns a handle to the specified file of
type FILE_TYPE.
Syntax: TEXT_IO.FOPEN(file_specs VARCHAR2, file_mode VARCHAR2);
The file mode can be R(read), W(write) or A(append).
FCLOSE - Closes an open file.
Syntax: TEXT_IO.FCLOSE(file_specs VARCHAR2);
IS_OPEN - Checks if the specified file is currently open and returns a
boolean.
Syntax: TEXT_IO.IS_OPEN(file_type FILE_TYPE);
Category 2: Output Operations
PUT - Concatenates the supplied data to the current line of an open file.
Syntax: TEXT_IO.PUT(file FILE_TYPE, data DATA_TYPE)
Valid data types are VARCHAR2, DATE, NUMBER, PLS_INTEGER.
All data except VARCHAR2 is converted to a character string.
PUTF - Formats and writes a character string to an open file,
doing a C-like substitution.
Syntax: TEXT_IO.PUTF(file FILE_TYPE, format VARCHAR2,
arg1[,...,arg5] VARCHAR2);
Format is an optional parameter. If it is omitted, only
one argument value can be passed.
You can embed up to 5 "%s" patterns within the format string,
which can be replaced by the corresponding strings
(arg1 ... arg5) at execution.
PUT_LINE - Concatenates the given argument string to the file
followed by a newline character.
Syntax: TEXT_IO.PUT_LINE(file FILE_TYPE, data VARCHAR2);
NEW_LINE - Concatenates n number of newline characters to the current line,
where n is the second argument with a default value of 1.
Syntax: TEXT_IO.NEW_LINE(file FILE_TYPE, n PLS_INTEGER := 1);
Note: If the file name is not specified each of the above cases, the
output is directed to the Interpreter.
Category 3: Input Given Operations
GET_LINE - Reads a line from an open file into the parameter.
Syntax: TEXT_IO.GET_LINE(file FILE_TYPE, data_item OUT VARCHAR2);
Note: After a GET_LINE call, the file pointer moves to the next
line and subsequent lines are read in after each call. If the
line to be read exceeds the size of data_item, the VALUE_ERROR
exception is raised. If no more characters can be read from the
file, the NO_DATA_FOUND exception is raised. You cannot move this
pointer back to the previous line though this can be simulated
using your own buffer scheme.
If a file name is provided for any of the above routines, this file
must be accessible to Oracle Forms. In addition, you must provide the
complete path. If no path is given, Forms assumes the file is in the
current working directory and does not search for the file in the file
system. The accessibility is determined as follows:
On Windows, a TEXT_IO package function call only accesses local
drives. It does not recognize any Universal Naming Conventions like
\\machine_name\drive_letter. To access files on remote machines using
the TEXT_IO package, map a letter to the remote drive through the File
Manager.
On UNIX, the absolute path must be given for the location of the file.
Forms does not recognize relative paths provided for the file. This is also
the case for VMS and other platforms. When you do not specify a path, Forms
assumes the file is in the current working directory.
For more information, refer to the TEXT_IO Package section in the
"Oracle Procedure Builder Packages" chapter of the Oracle
Developer/2000 Procedure Builder Developer's Guide Manual.
Sample Form
The following sample form explains some of the concepts and the
syntax. The form reads in lines from a specified text file one at a
time and displays them in a text item. It enables the user to parse
the file by getting the next or the previous line. In addition, the
user can write any line currently displayed to a specified output
file.
Create a single non-base table block. Put the following items and
buttons on it. Create the appropriate boilerplate text for each item.
All items go on the same canvas. No database connection is required
for this application.
Create the following text items:
1. Name INPUT_FILE_SPECS
Item Type Text Item
Data Type Char
Maximum Length 30
2. Name LINE_READ
Item Type Text Item
Data Type Char
Maximum Length 300
3. Name OUTPUT_FILE_SPECS
Item Type Text Item
Data Type Char
Maximum Length 30
4. Name LINE_NO
Item Type Text Item
Data Type Number
Maximum Length 30
Create the following buttons and associated triggers:
1. Name OPEN_AND_READ_FROM_FILE
Label Echo file using TEXT_IO package
Associated Button Trigger:
Name WHEN-BUTTON-PRESSED
Trigger Text:
IF :input_file_specs IS NOT NULL THEN
:line_no := 1;
ECHO_TEXT_IO;
ELSE
MESSAGE('You must enter a valid input file name
with a complete path');
END IF;
2. Name NEXT
Label NEXT LINE
Associated Button Trigger:
Name WHEN-BUTTON-PRESSED
Trigger Text:
:line_no := :line_no + 1;
ECHO_TEXT_IO;
3. Name PREVIOUS
Label PREVIOUS LINE
Associated Button Trigger:
Name WHEN-BUTTON-PRESSED
Trigger Text:
IF :line_no = 1 THEN
MESSAGE('You are on the first line of the file.');
ELSE
:line_no := :line_no - 1;
TEXT_IO.FCLOSE(variable_declarations.infile);
/* Close the file then reopen it with the
ECHO_TEXT_IO package. This resets the
file pointer. */
ECHO_TEXT_IO;
END IF;
4. Name WRITE_LINE_TO_FILE
Label WRITE CURRENT LINE TO Output FILE
Associated button trigger:
Name WHEN-BUTTON-PRESSED
Trigger Text:
IF :output_file_specs IS NOT NULL THEN
write_to_file;
ELSE
MESSAGE('Must enter a valid output file name with
complete path');
END IF;
Create the following program units and package specifications:
1. ECHO_TEXT_IO* (Procedure Body)
PROCEDURE echo_text_io IS
-- infile TEXT_IO.FILE_TYPE; /* Not used in this program */
linebuf VARCHAR2(300);
line_counter INTEGER;
BEGIN
line_counter := 0;
Note that the IF condition would be redundant if you use
a local variable (commented out above) to save the file pointer.
Infile is a local variable, so the binding would be lost each
time you exited the program. The use of package variables
to act as global file type handles resolves this problem.
IF TEXT_IO.IS_OPEN(variable_declarations.infile) THEN
If the file is open, read in the next line.
TEXT_IO.GET_LINE(variable_declarations.infile, linebuf);
line_counter := line_counter + 1;
ELSE
The file is closed for the application when you display the
previous line; see the WHEN_BUTTON_PRESSED trigger on the
PREVIOUS item. Since the file pointer cannot move
backwards, you must reset the file pointer and loop to the
specified line.
variable_declarations.infile := TEXT_IO.FOPEN(:INPUT_FILE_SPECS, 'r')
-- variable_declarations.infile := TEXT_IO.FOPEN('c:\autoexec.bat', 'r')
/* You can also hard-code the value */
WHILE line_counter < :line_no LOOP
TEXT_IO.GET_LINE(variable_declarations.infile, linebuf);
line_counter := line_counter + 1;
END LOOP;
END IF;
:line_read := linebuf;
EXCEPTION
WHEN NO_DATA_FOUND THEN
MESSAGE('End Of File reached.');
:line_no := :line_no - 1;
WHEN OTHERS THEN
MESSAGE('UNHANDLED EXCEPTION RAISED in ECHO_TEXT_IO
procedure - Check the file name');
MESSAGE('U. E. R.');
END;
2. VARIABLE_DECLARATIONS (Package Spec)
PACKAGE variable_declarations IS
The following declarations are public and, hence, visible
to the Forms application.
infile TEXT_IO.FILE_TYPE;
outfile TEXT_IO.FILE_TYPE;
line_number NUMBER;
END;
3. WRITE_TO_FILE* (Procedure Body)
PROCEDURE write_to_file IS
BEGIN
IF NOT TEXT_IO.IS_OPEN(variable_declarations.outfile) THEN
variable_declarations.outfile := TEXT_IO.FOPEN(:OUTPUT_FILE_SPECS, 'a');
END IF;
TEXT_IO.PUT_LINE(variable_declarations.outfile, :line_read);
END;Sarah
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