How to search/split a string from visa read
hello all, i have a string coming from the serial port... the pattern is:
\00\s\s\s\s0,\s\s\s\s12,\s\s\s\s\s0,\s\s\s\s\s0\r\n
where the data is read as 0, 12, 0 , 0. i would like to save this data into a Write to Measurement File, for which i have to convert this text data into decimal format. can anyone please suggest me how to reduce the data from the string? I know I can save the data in a text file, but i am limited to use the Write to Measurement FIle.vi
please help.
Now on LabVIEW 10.0 on Win7
Hello LV_Enthu,
Have you played around with the functions in the Functions palette>>String at all? There are a few helpful functions like search/split strings and match string pattern that can be helpful, but here is an example from our website as well that does just this. Please let me know if you have any further questions.
Thank you,
Deborah Y.
LabVIEW Real-Time Product Marketing Manager
Certified LabVIEW Architect
National Instruments
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Our RS232-enabled instrument sends ASCII strings to COM 1 and I read strings in. For example I get the string "TPM", or at least it looks like "TPM" if I display it. However, if I send that to the selector input of a Case structure, and create a case for "TPM", whether the two appear to match varies. Sometimes it matches, and measuring its length returns 3. Sometimes it measures 7 or 11 or 12 characters long, and it doesn't match. I can reproduce a match or a mismatch by my choice of the command that went to the instrument prior to the command that causes the TPM response, but have made no sense of this clue. I have run it through Trim Whitespace, with Both Ends (the default) explicitly selected. I have also turned the string into a byte array, autoindexed a For loop on that, and only passed the bytes if they don't equal 32, or if they don't equal 0, thinking spaces or nulls might be in there, but no better.
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Hi ,
I want to store the data into text file,which is coming from visa-read.
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Thanks in advance.CSFGF wrote:
Hi ,
I want to store the data into text file,which is coming from visa-read.
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Hi.
I receive data from MCU whcih sampling frequency is constant and we assumed it is S. now I get data from MCU with using VISA read block. I can display data, perform some functios like filtering, multiply and save them in txt files. all thing is OK.
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How to split the string from character position.
HI ALL,
I need to split the string like this.
example:
String = "HelloWorld"
mid("HelloWorld", 2, 5);
it should print "ello"
menas mid is functiuon it will split "HelloWorld" from 2nd character to 5th character and prints "ello".
This one how to do in labview.
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How do I avoid Error 85 in Scan From String scanning VISA read buffer?
I have encountered an Error 85 with my Scan From String VI. I have a timed
loop to read data from a device (flowmeter) using a serial port. This device takes
periodic measurements and sends the reading which contains a numerical value to the serial port COM1. It cannot be read continuously, and the period
between measurements may vary, so I decided a timed loop would be better than a while loop.
The VI begins with VISA Configure Serial Port and then
goes to a VISA Write which sends the message to the device to begin
taking measurements. After this, the device usually says "TAKE FLOWMETER READINGS" to the terminal, thereafter only sending numbers. Then begins my timed loop containing VISA Read. I
am taking the read buffer two places.
First, I am taking it to an Array to Spreadsheet String with the
Format String %.3f, as was in the Write to Text File example. Then I am
using Concatenate Strings with this string and also a string containing
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configured using Open/Create/Replace File outside of the loop.
Second, I am taking the read buffer to a waveform chart. I thought
it would be a good idea to use Scan From String to convert the string
into a DBL which I am then sending to the waveform
chart.
I am not sure if the initial "TAKE READINGS" message is giving me an error. I was able to get one reading saved to my text file from the device.
Also the format string for my Scan From String is %.3f
I am getting the Error 85 at the Scan From String only sometimes.
When this happens, there is no data being written to the text file. But
other times, I get data and it writes to the text file just fine (but
rounds to nearest whole number).
Any help would be greatly appreciated! This serial port device has been giving me a lot of trouble.Is this what you mean? Did I wire the shift registers correctly?
I didn't know if you meant to Concatenate before Scan From String or Concantenate before or after VISA Read?
Message Edited by YeungJohn on 11-20-2008 03:48 PM
Message Edited by YeungJohn on 11-20-2008 03:49 PM
Attachments:
SerialShiftVI.JPG 87 KB -
How to search for particular string in array?
I am struggling to figure out how to search array contents for a string and then delete the entry from the array if it is found.
The code for a program that allows the user to enter up to 20 inventory items (tools) is posted below; I apologize in advance for it as I am also not having much success grasping the concept of OOP and I am certain it is does not conform although it all compiles.
Anyway, if you can provide some assistance as to how to go about searching the array I would be most grateful. Many thanks in advance..
// ==========================================================
// Tool class
// Reads user input from keyboard and writes to text file a list of entered
// inventory items (tools)
// ==========================================================
import java.io.*;
import java.text.DecimalFormat;
public class Tool
private String name;
private double totalCost;
int units;
// int record;
double price;
// Constructor for Tool
public Tool(String toolName, int unitQty, double costPrice)
name = toolName;
units = unitQty;
price = costPrice;
public static void main( String args[] ) throws Exception
String file = "test.txt";
String input;
String item;
String addItem;
int choice = 0;
int recordNum = 1;
int qty;
double price;
boolean valid;
String toolName = "";
String itemQty = "";
String itemCost = "";
DecimalFormat fmt = new DecimalFormat("##0.00");
// Display menu options
System.out.println();
System.out.println(" 1. ENTER item(s) into inventory");
System.out.println(" 2. DELETE item(s) from inventory");
System.out.println(" 3. DISPLAY item(s) in inventory");
System.out.println();
System.out.println(" 9. QUIT program");
System.out.println();
System.out.println("==================================================");
System.out.println();
// Declare and initialize keyboard input stream
BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
do
valid = false;
try
System.out.print(" Enter an option > ");
input = stdin.readLine();
choice = Integer.parseInt(input);
System.out.println();
valid = true;
catch(NumberFormatException exception)
System.out.println();
System.out.println(" Only numbers accepted. Try again.");
while (!valid);
while (choice != 1 && choice != 2 && choice != 9)
System.out.println(" Not a valid option. Try again.");
System.out.print(" Enter an option > ");
input = stdin.readLine();
choice = Integer.parseInt(input);
System.out.println();
if (choice == 1)
// Declare and initialize input file
FileWriter fileName = new FileWriter(file);
BufferedWriter bufferedWriter = new BufferedWriter(fileName);
PrintWriter dataFile = new PrintWriter(bufferedWriter);
do
addItem="Y";
System.out.print(" Enter item #" + recordNum + " name > ");
toolName = stdin.readLine();
if (toolName.length() > 15)
toolName = toolName.substring(0,15); // Convert to uppercase
toolName = toolName.toUpperCase();
dataFile.print (toolName + "\t");
do
valid = false;
try
// Prompt for item quantity
System.out.print(" Enter item #" + recordNum + " quantity > ");
itemQty = stdin.readLine();
// Parse integer as string
qty = Integer.parseInt (itemQty);
// Write item quantity to data file
dataFile.print(itemQty + "\t");
valid=true;
catch(NumberFormatException exception)
// Throw error for all non-integer input
System.out.println();
System.out.println(" Only whole numbers please. Try again.");
while (!valid);
do
valid = false;
try
// Prompt for item cost
System.out.print(" Enter item #" + recordNum + " cost (A$) > ");
itemCost = stdin.readLine();
// Parse float as string
price = Double.parseDouble(itemCost);
// Write item cost to data file
dataFile.println(fmt.format(price));
valid = true;
catch(NumberFormatException exception)
// Throw error for all non-number input (integers
// allowed)
System.out.println();
System.out.println(" Only numbers please. Try again.");
while (!valid);
// Prompt to add another item
System.out.println();
System.out.print(" Add another item? Y/N > ");
addItem = stdin.readLine();
while ((!addItem.equalsIgnoreCase("Y")) && (!addItem.equalsIgnoreCase("N")))
// Prompt for valid input if not Y or N
System.out.println();
System.out.println(" Not a valid option. Try again.");
System.out.print(" Add another item? Y/N > ");
addItem = stdin.readLine();
System.out.println();
// Increment record number by 1
recordNum++;
if (addItem.equalsIgnoreCase("N"))
System.out.println();
System.out.println(" The output file \"" + file + "\" has been saved.");
System.out.println();
System.out.println(" Quitting program.");
while (addItem.equalsIgnoreCase("Y"));
// Close input file
dataFile.close();
if (choice == 2)
try {
Read user input (array search string)
Search array
If match found, remove entry from array
Confirm "deletion" and display new array contents
catch block {
} // class
// ==========================================================
// ListToolDetails class
// Reads a text file into an array and displays contents as an inventory list
// ==========================================================
import java.io.*;
import java.util.StringTokenizer;
import java.text.DecimalFormat;
public class ListToolDetails {
// Declare variable
private Tool[] toolArray; // Reference to an array of objects of type Tool
private int toolCount;
public static void main(String args[]) throws Exception {
String line, name, file = "test.txt";
int units, count = 0, record = 1;
double price, total = 0;
DecimalFormat fmt = new DecimalFormat("##0.00");
final int MAX = 20;
Tool[] items = new Tool[MAX];
System.out.println("Inventory List");
System.out.println();
System.out.println("REC.#" + "\t" + "ITEM" + "\t" + "QTY" + "\t"
+ "PRICE" + "\t" + "TOTAL");
System.out.println("\t" + "\t" + "\t" + "\t" + "PRICE");
System.out.println();
try {
// Read a tab-delimited text file of inventory items
FileReader fr = new FileReader(file);
BufferedReader inFile = new BufferedReader(fr);
StringTokenizer tokenizer;
while ((line = inFile.readLine()) != null) {
tokenizer = new StringTokenizer(line, "\t");
name = tokenizer.nextToken();
try {
units = Integer.parseInt(tokenizer.nextToken());
price = Double.parseDouble(tokenizer.nextToken());
items[count++] = new Tool(name, units, price);
total = units * price;
} catch (NumberFormatException exception) {
System.out.println("Error in input. Line ignored:");
System.out.println(line);
System.out.print(" " + count + "\t");
System.out.print(line + "\t");
System.out.print(fmt.format(total));
System.out.println();
inFile.close();
} catch (FileNotFoundException exception) {
System.out.println("The file " + file + " was not found.");
} catch (IOException exception) {
System.out.println(exception);
System.out.println();
// Unfinished functionality for displaying "error" message if user tries to
// add more than 20 tools to inventory
public void addTool(Tool maxtools) {
if (toolCount < toolArray.length) {
toolArray[toolCount] = maxtools;
toolCount += 1;
} else {
System.out.print("Inventory is full. Cannot add new tools.");
// This should search inventory by string and remove/overwrite matching
// entry with null
public Tool getTool(int index) {
if (index < toolCount) {
return toolArray[index];
} else {
System.out
.println("That tool does not exist at this index location.");
return null;
} // classData file contents:
TOOL 1 1 1.21
TOOL 2 8 3.85
TOOL 3 35 6.92Ok, so you have an array of Strings. And if the string you are searching for is in the array, you need to remove it from the array.
Is that right?
Can you use an ArrayList<String> instead of a String[ ]?
To find it, you would just do:
for (String item : myArray){
if (item.equals(searchString){
// remove the element. Not trivial for arrays, very easy for ArrayList
}Heck, with an arraylist you might be able to do the following:
arrayList.remove(arrayList.indexOf(searchString));[edit]
the above assumes you are using 1.5
uses generics and for each loop
[edit2]
and kinda won't work it you have to use an array since you will need the array index to be able to remove it. See the previous post for that, then set the value in that array index to null.
Message was edited by:
BaltimoreJohn -
How to search for a string in ALL Function Modules source code
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How do I "link" the programs to eachother? Im a newbie....
import java.sql.*;
import java.util.*;
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public static void main(String[] args) {
Connection conn = null;
try {
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Hi Guys,
I have a question hopefully you guys can help with..
I have a set of data similar to
sefsfesef<1111>Example<2222>desefsefsefefsefsef<1111>Example2<2222>sefsefsef
What I want to do is split my string between the <1111> and <2222> and get "Example" and "Example2" back... is this possible in Java? Possibly using regular expressions of sorts. I'm a little lost, any help would be much appreciated!
Thanks,
VasantHere is an example (parse.java) that will work provided that the content between <1111> and <2222> does not contain the < character.
import java.util.regex.*;
public class parse {
public static void main(String args[]) {
String teststring = "sefsfesef<1111>Example<2222>desefsefsefefsefsef<1111>Example2<2222>sefsefsef";
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