Writing to file limiting system performance
Hello,
I really could use some help with my VI in terms of writing data. I’ve had a LOT of help optimizing my code and am trying to enhance the performance in terms of data acquisition. However, it seems as though writing to a data file is really limiting the frequency I can sample at. I’ve done some research and understand that writing data at every iteration of the while loop and the build array function slows things down. How would I modify the code so that the array buffer would store maybe 5000 data points before writing to a file, then clearing the array? That would keep the array size small, as well as reduce the number of times the program is performing the write to file function. Is there a better way of doing this? I’m open to any other ideas as well.
I am taking data from 14 channels, and would like to sample at 1 kHz each. The task right now is created within Measurement and Automation Explorer, and the number of samples is at 100. I also use a buffer indicator, which will generally grow out of control, no matter how much I modify the number of samples and the frequency. The length of my test can last upwards to 6 hours, so it needs to work that long without crashing.
The code and attached subVI’s is attached. Hopefully it's all there.
Thanks for your help,
Alex
Attachments:
Test Program.zip 295 KB
Lynn,
Yea, I'll have to keep on the block diagram size in the future. Can get unwieldy.
I tried incorporating the Recent History Buffer example into my code. I did have a few hang ups, which are giving me some trouble. Mostly, how do I connect my waveform data to the Buffer VI? Will I be able to have all my channels connect to this? Also, ultimately I will have two write to file VI's. Can the buffer differentiate between which file to write?
Thanks,
Alex
Attachments:
Instrument Panel V1.1 (Labview 8.0).vi 159 KB
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제품 : ORACLE SERVER
작성날짜 : 2002-04-11
2GB OR NOT 2GB - FILE LIMITS IN ORACLE
======================================
Introduction
~~~~~~~~~~~~
This article describes "2Gb" issues. It gives information on why 2Gb
is a magical number and outlines the issues you need to know about if
you are considering using Oracle with files larger than 2Gb in size.
It also
looks at some other file related limits and issues.
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Why is 2Gb a Special Number ?
Why use 2Gb+ Datafiles ?
Export and 2Gb
SQL*Loader and 2Gb
Oracle and other 2Gb issues
Port Specific Information on "Large Files"
Why is 2Gb a Special Number ?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Many CPU's and system call interfaces (API's) in use today use a word
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negative). In hexadecimal the largest positive number that can be
represented in in 31 bits is 0x7FFFFFFF , which is +2147483647 decimal.
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2147483648 or higher in a 32bit environment. To overcome this problem
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typically use 64-bit addressing for file sizes and offsets. Recent Oracle
releases make use of these new interfaces but there are a number of issues
one should be aware of before deciding to use 'large files'.
What does this mean when using Oracle ?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The 32bit issue affects Oracle in a number of ways. In order to use large
files you need to have:
1. An operating system that supports 2Gb+ files or raw devices
2. An operating system which has an API to support I/O on 2Gb+ files
3. A version of Oracle which uses this API
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Why use 2Gb+ Datafiles ?
~~~~~~~~~~~~~~~~~~~~~~~~
In this section we will try to summarise the advantages and disadvantages
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Less file handle resources required
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Check with the OS Vendor to determine if large files are supported
and how to configure for them.
Check with the OS Vendor what the maximum file size actually is.
Check with Oracle support if any patches or limitations apply
on your platform , OS version and Oracle version.
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an value of MAXSIZE larger than Oracle can cope with which may
result in internal errors after the resize occurs. (Errors
typically include ORA-600 [3292])
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block at the start of the file so creating a file of 2Gb actually
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2Gb related Oracle Errors:
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ORA-01119 Error in creating datafile xxxx
ORA-27044 unable to write header block of file
SVR4 Error: 22: Invalid argument
ORA-19502 write error on file 'filename', blockno x (blocksize=nn)
ORA-27070 skgfdisp: async read/write failed
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KCF:write/open error dba=xxxxxx block=xxxx online=xxxx file=xxxxxxxx
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~~~~~~~~~~~~~~
2Gb Export File Size
~~~~~~~~~~~~~~~~~~~~
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(This article also describes in detail how to export to
a unix pipe, remote shell etc..)
Other 2Gb Export Issues
~~~~~~~~~~~~~~~~~~~~~~~
Oracle has a maximum extent size of 2Gb. Unfortunately there is a problem
with EXPORT on many releases of Oracle such that if you export a large table
and specify COMPRESS=Y then it is possible for the NEXT storage clause
of the statement in the EXPORT file to contain a size above 2Gb. This
will cause import to fail even if IGNORE=Y is specified at import time.
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limit:
. . exporting table BIGEXPORT
EXP-00015: error on row 10660 of table BIGEXPORT,
column MYCOL, datatype 96
EXP-00002: error in writing to export file
EXP-00002: error in writing to export file
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There is a secondary issue reported in <Bug:185855> which indicates that
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file size specified in BYTES. If the filesize is above 2Gb this may
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<Bug:490837> indicates a similar problem.
Export to Tape
~~~~~~~~~~~~~~
The VOLSIZE parameter for export is limited to values less that 4Gb.
On some platforms may be only 2Gb.
This is corrected in Oracle 8i. <Bug:490190> describes this problem.
SQL*Loader and 2Gb
~~~~~~~~~~~~~~~~~~
Typically SQL*Loader will error when it attempts to open an input
file larger than 2Gb with an error of the form:
SQL*Loader-500: Unable to open file (bigfile.dat)
SVR4 Error: 79: Value too large for defined data type
The examples in <Note:30528.1> can be modified to for use with SQL*Loader
for large input data files.
Oracle 8.0.6 provides large file support for discard and log files in
SQL*Loader but the maximum input data file size still varies between
platforms. See <Bug:948460> for details of the input file limit.
<Bug:749600> covers the maximum discard file size.
Oracle and other 2Gb issues
~~~~~~~~~~~~~~~~~~~~~~~~~~~
This sections lists miscellaneous 2Gb issues:
- From Oracle 8.0.5 onwards 64bit releases are available on most platforms.
An extract from the 8.0.5 README file introduces these - see <Note:62252.1>
- DBV (the database verification file program) may not be able to scan
datafiles larger than 2Gb reporting "DBV-100".
This is reported in <Bug:710888>
- "DATAFILE ... SIZE xxxxxx" clauses of SQL commands in Oracle must be
specified in 'M' or 'K' to create files larger than 2Gb otherwise the
error "ORA-02237: invalid file size" is reported. This is documented
in <Bug:185855>.
- Tablespace quotas cannot exceed 2Gb on releases before Oracle 7.3.4.
Eg: ALTER USER <username> QUOTA 2500M ON <tablespacename>
reports
ORA-2187: invalid quota specification.
This is documented in <Bug:425831>.
The workaround is to grant users UNLIMITED TABLESPACE privilege if they
need a quota above 2Gb.
- Tools which spool output may error if the spool file reaches 2Gb in size.
Eg: sqlplus spool output.
- Certain 'core' functions in Oracle tools do not support large files -
See <Bug:749600> which is fixed in Oracle 8.0.6 and 8.1.6.
Note that this fix is NOT in Oracle 8.1.5 nor in any patch set.
Even with this fix there may still be large file restrictions as not
all code uses these 'core' functions.
Note though that <Bug:749600> covers CORE functions - some areas of code
may still have problems.
Eg: CORE is not used for SQL*Loader input file I/O
- The UTL_FILE package uses the 'core' functions mentioned above and so is
limited by 2Gb restrictions Oracle releases which do not contain this fix.
<Package:UTL_FILE> is a PL/SQL package which allows file IO from within
PL/SQL.
Port Specific Information on "Large Files"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Below are references to information on large file support for specific
platforms. Although every effort is made to keep the information in
these articles up-to-date it is still advisable to carefully test any
operation which reads or writes from / to large files:
Platform See
~~~~~~~~ ~~~
AIX (RS6000 / SP) <Note:60888.1>
HP <Note:62407.1>
Digital Unix <Note:62426.1>
Sequent PTX <Note:62415.1>
Sun Solaris <Note:62409.1>
Windows NT Maximum 4Gb files on FAT
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** See <Note:67421.1> before using large files
on NT with Oracle8
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System.out.println("Populating the window");
backgroundsController.populateBackgroundsData();
backgroundsController.populateBackgroundsList();
//loops to add background panels to the JSP
ArrayList<JPanel> tempBackgroundsList = new ArrayList<JPanel>();
JPanel tempBGJP = new JPanel();
tempBackgroundsList = backgroundsController.getBackgroundsList();
int j = tempBackgroundsList.size();
JPanel backgroundListPanel = new JPanel(new GridLayout(j,1));
for(int i = 0; i < j; i++){
tempBGJP = tempBackgroundsList.get(i);
System.out.println("Adding to the JSP: " + tempBGJP.getName());
//Add Mouse Listener
tempBGJP.addMouseListener(bgMouseListener);
backgroundListPanel.add(tempBGJP, i);
//set viewpoing
backgroundList.setViewportView(backgroundListPanel);
/*TESTING
System.out.println("\n\n TESTING!\n Printing Content of SCROLL PANE \n");
j = tempBackgroundsList.size();
for(int i = 0; i < j; i++){
System.out.println(backgroundList.getComponent(i).getName());
changeBackgroundJP.add(changeBackgroundJL, BorderLayout.NORTH);
changeBackgroundJP.add(backgroundList, BorderLayout.CENTER);
//changeBackgroundJP.add(tempBGJP, BorderLayout.CENTER);
changeBackgroundJP.add(changeBackgroundBottomJP, BorderLayout.SOUTH);
changeBackgroundBottomJP.add(changeBackgroundJB);
changeBackgroundBottomJP.add(defaultStyleJB);
System.out.println("Finsihed populating");
//REMOVED CODE
//adding the Background Menu to the GUI and settign the GUI options
//AppletGUI.setDefaultLookAndFeelDecorated(true);
//this.setResizable(true);
//this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocation(500,500);
this.setSize(400,300);
this.add(changeBackgroundJP);
//REMOVED CODE
*Main Method*
public static void main(String[] args){
System.out.println("Creating GUI");
AppletGUI theGUI = new AppletGUI();
theGUI.setVisible(true);
System.out.println("GUI Displayed");
*Button Listener Inner Class*
public class ButtonListener implements ActionListener{
//check which button is clicked
public void actionPerformed(ActionEvent event) {
AbstractButton theButton = (AbstractButton)event.getSource();
//Default Style Button
if(theButton == defaultStyleJB){
System.out.println("Default Style Button Clicked!");
//Change Background Button
if(theButton == changeBackgroundJB){
System.out.println("Change Background Button Clicked!");
String backgroundURL = cssGenerator.getBackground();
if(backgroundURL != ""){
cssGenerator.setBackgroundChanged(true);
cssGenerator.setBackground(backgroundURL);
cssGenerator.outputCSSFile();
System.out.println("Backgroudn Changed, CSS File Written");
else{
System.out.println("No Background Selected");
*Mouse Listener Inner Class*
public class backgroundMouseListener implements MouseListener{
public void mouseClicked(MouseEvent e){
//get component
JPanel tempBackgroundJP = new JPanel();
tempBackgroundJP = (JPanel)e.getComponent();
System.out.println("Background Panel Clicked");
//change component colour
if(selectedComponent == null){
selectedComponent = tempBackgroundJP;
else{
changeColour((JPanel)selectedComponent, false);
selectedComponent = tempBackgroundJP;
changeColour((JPanel)selectedComponent, true);
//set background URL
cssGenerator.setBackground(tempBackgroundJP.getName());
public void mousePressed(MouseEvent e){
public void mouseReleased(MouseEvent e){
public void mouseEntered(MouseEvent e){
public void mouseExited(MouseEvent e){
}JApplet Class, this is what I plugged the GUI into after I made the change from Application to JApplet.
public class AppletTest extends JApplet{
public void init() {
System.out.println("Creating GUI");
AppletGUI theGUI = new AppletGUI();
theGUI.setVisible(true);
Container content = getContentPane();
content.setBackground(Color.white);
content.setLayout(new FlowLayout());
content.add(theGUI);
AppletGUI theGUI = new AppletGUI();
theGUI.setVisible(true);
setContentPane(theGUI);
System.out.println("GUI Displayed");
public static void main(String[] args){
AppletTest at = new AppletTest();
at.init();
at.start();
}The CSS Generator Class. This exists because once I have the basic program working I intend to expand upon it and add multiple tabs to the GUI, each one allowing the user to change different style options. Each style option to be changed will be changed wit ha different method in this class.
public class CSSGenerator {
//Variables
String background = "";
ArrayList<String> backgroundCSS;
//Flags
boolean backgroundChanged = false;
//Sets and Gets
//For Variables
public void setBackground(String theBackground){
background = theBackground;
public String getBackground(){
return background;
//For Flags
public void setBackgroundChanged(boolean isBackgroundChanged){
backgroundChanged = isBackgroundChanged;
public boolean getBackgroundChanged(){
return backgroundChanged;
//background generator
public ArrayList<String> backgroundGenerator(String backgroundURL){
//get the URL for the background
backgroundURL = background;
//creat a new array list of strings
ArrayList<String> backgroundCSS = new ArrayList<String>();
//add the strings for the background options to the array list
backgroundCSS.add("body");
backgroundCSS.add("{");
backgroundCSS.add("background-image: url(" + backgroundURL + ");");
backgroundCSS.add("background-color: #ff0000");
backgroundCSS.add("}");
return backgroundCSS;
//Write CSS to File
public void outputCSSFile(){
try{
//Create CSS file
System.out.print("creating file");
FileWriter cssWriter = new FileWriter("C:/Documents and Settings/Gwilym/My Documents/Applet Data/CustomStyle.css");
System.out.print("file created");
System.out.print("creating buffered writer");
BufferedWriter out = new BufferedWriter(cssWriter);
System.out.print("buffered writer created");
//check which settings have been changed
//check background flag
if(getBackgroundChanged() == true){
System.out.print("retrieving arraylist");
ArrayList<String> tempBGOptions = backgroundGenerator(getBackground());
System.out.print("arraylist retrieved");
int j = tempBGOptions.size();
for(int i = 0; i < j ; i++){
System.out.print("writing to the file");
out.write(tempBGOptions.get(i));
out.newLine();
System.out.print("written to the file");
out.close();
}catch (Exception e){//Catch exception if any
System.out.println("Error: Failed to write CSS file");
/** Creates a new instance of CSSGenerator */
public CSSGenerator() {
}The Backgrounds Class. This class exists because I didnt want there to just be a hardcoded lsit of backgrounds, I wanted it to be possible to add new ones to the list without simply lettign users upload their own images (since the intended users are kids and this sharepoint site is used for educational purposes, I dont want them uplaoded inapropraite backgrounds) but I do want the site admin to be able to add more images to the list. for this reason the backgrounds are taken from a list in a text file that will be stored in the same location as the applet, the file specifies the background name, where it is stored, and where a thumbnail image is stored.
public class Backgrounds {
//Array Lists
private ArrayList<JPanel> backgroundsList;
private ArrayList<String> backgroundsData;
//Set And Get Methods
public ArrayList getBackgroundsList(){
return backgroundsList;
//ArrayList Population Methods
public void populateBackgroundsData(){
//decalre the input streams and create a new fiel hat points to the BackgroundsData file
File backgroundsDataFile = new File("C:/Documents and Settings/Gwilym/My Documents/Applet Data/BackgroundsData.txt");
FileInputStream backgroundsFIS = null;
BufferedInputStream backgroundsBIS = null;
DataInputStream backgroundsDIS = null;
try {
backgroundsFIS = new FileInputStream(backgroundsDataFile);
backgroundsBIS = new BufferedInputStream(backgroundsFIS);
backgroundsDIS = new DataInputStream(backgroundsBIS);
backgroundsData = new ArrayList<String>();
String inputtedData = null;
//loops until it reaches the end of the file
while (backgroundsDIS.available() != 0) {
//reads in the data to be stored in an array list
inputtedData = backgroundsDIS.readLine();
backgroundsData.add(inputtedData);
//TESTING
System.out.println("\n\nTESTING: populateBackgroundsData()");
int j = backgroundsData.size();
for(int i = 0; i < j; i++){
System.out.println("Index " + i + " = " + backgroundsData.get(i));
System.out.println("\n\n");
//close all stremas
backgroundsFIS.close();
backgroundsBIS.close();
backgroundsDIS.close();
} catch (FileNotFoundException e) {
System.out.println("Error: File Not Found");
} catch (IOException e) {
System.out.println("Error: IO Exception Thrown");
public void populateBackgroundsList(){
backgroundsList = new ArrayList<JPanel>();
int j = backgroundsData.size();
System.out.println("number of backgrounds = " + j);
backgroundsList = new ArrayList<JPanel>();
for(int i = 0; i < j; i++){
String tempBackgroundData = backgroundsData.get(i);
JPanel backgroundJP = new JPanel(new GridLayout(1,2));
JLabel backgroundNameJL = new JLabel();
JLabel backgroundIconJL = new JLabel();
//split the string string and egt the background name and URL
String[] splitBGData = tempBackgroundData.split(",");
String backgroundName = splitBGData[0];
String backgroundURL = splitBGData[1];
String backgroundIcon = splitBGData[2];
System.out.println("\nbackgroundName = " + backgroundName);
System.out.println("\nbackgroundURL = " + backgroundURL);
System.out.println("\nbackgroundIcon = " + backgroundIcon + "\n");
backgroundNameJL.setText(backgroundName);
backgroundIconJL.setIcon(new javax.swing.ImageIcon(backgroundIcon));
backgroundJP.add(backgroundNameJL);
backgroundJP.add(backgroundIconJL);
backgroundJP.setBorder(javax.swing.BorderFactory.createBevelBorder(javax.swing.border.BevelBorder.RAISED));
//Name the JP as the background URL so it can be found
//May be useful sicne the data file may need to contain 3 fields in future
//this is incase the preview image (icon) is different from the acctual background
//most liekly in the case of more complex ppictures rather then repeating patterns
backgroundJP.setName(backgroundURL);
//Add the JP to the Array List
backgroundsList.add(backgroundJP);
//TESTING
System.out.println("\n\nTESTING: populateBackgroundsList()");
j = backgroundsList.size();
for(int i = 0; i < j; i++){
System.out.println("Index " + i + " = " + backgroundsList.get(i));
System.out.println("\n\n");
}So thats my program so far, if theres anythign that needs clarifying then please jsut ask. Thank you very much for the help! -
"Error writing to file" when installing Oracle9i
I am fairly new to Oracle and have not been able to install Oracle 9i on my Redhat 7.2 box. In three attempts to install I have encountered the same error at some point, usually early on 5% or 10% into the install.
The error is:
"Error in writing to file /usr/oracle/product/9.2.0/olap/wrksht/wks.jar"
However, it has not happened on the same file each time. I have stopped the installation of that component, but it encounters the same error on other files. I have tried redownloading the oracle disks and reinstalling, but to no avail. I read on one posting that Oracle needs to have glib2.2(rather than glib1.2) installed, so I downloaded it and will be trying that later today. If anyone has encountered this error and knows how to solve it I would appreciate the help. Below I have listed my computer configuration and I have attached the portion of the install log that identifies the error that takes place.
Thanks
Ed
Here is my setup:
Dual boot system running Redhat 7.2 and Win2k server.
Pentium III 400 MHZ
256 MB of RAM
30 GB Hard drive split in half-- 15GB for linux 15GB for windows.
The mount points for linux are
/ 400 MB
/boot 400 MB
/home 1GB
/tmp 600 MB
/swap 600 MB
/usr 12GB
ORACLE_HOME is /usr/oracle/product/9.2.0
all data files and software are under /usr/oracle
Portion of the install log:
Starting install install phase 1 of component Oracle OLAP Worksheet
Calling query areasQueries2.2.0.7.0 getProductHome
name = oracle.swd.jre
startVersion = 1.1.8.0.0
endVersion = 1.1.8.99.99
acceptCompatible = null
Query returned : /usr/oracle/jre/1.1.8
Setting value of JDK_ROOT to /usr/oracle/jre/1.1.8
Calling action fileActions2.2.0.10.0 copyGroupFromJar
selectedNodes = null
copyGroup = worksheet
permissions = 644
owner = null
group = null
copyAsText = null
JarLoc = /tmp/OraInstall2003-01-23_03-02-09PM/temp57
gpEntries = [[xsjwork.jar ->%ORACLE_HOME%/olap/wrksht/xsjwork.jar 1803268 plats=1=>
Exception thrown from action: copyGroupFromJar
Exception Name: IOException2
Exception String: Error in writing to file /usr/oracle/product/9.2.0/olap/wrksht/wks.jar
Exception Severity: 2
*** Cancel Dialog: ***
User selected: Stop installation of all products.
Exception handling set to prompt user with options to RETRY IGNORE
User choice : User selected stop installation of all components
Error in writing to file /usr/oracle/product/9.2.0/olap/wrksht/wks.jar
Unable to read the list of homes from the inventory.
Hi,
Did you guys finally find solution to the problem?
I have been trying to install Oracle 9.2.0.1 on redhat 8.0 box, for ages now. I get the following error first during install
Error in writing to file libclntsh.so.9.0
Then it is a series of errors, similar.
In the end there is the dreaded linking error... for the ins_rdbms.mk sdo_on
i just cant handle it.
What the hell is wrong?
I have done everything right as far as i know... any solutions?
cheers -
I'm working on a program that asks for the users name. after that its supposed to pull the current date and time and print that into a file along with the users name.
my problem is when i open the .txt file i get several characters i dont recogize and then my name at the end.
Thanks for the help:
public class CIS314Exam1MarkWellsFrame
private ObjectOutputStream output;
public void openFile()
try
output = new ObjectOutputStream(new FileOutputStream("guestlog.txt"));
catch(IOException ioException)
JOptionPane.showMessageDialog(null, "You do not have access to this file");
System.exit(1);
public void insertName()
try
Date today = new Date();
//utput.writeObject(today);
//String name = JOptionPane.showInputDialog("Enter Name");
String name = "Mark";
output.writeObject(name);
catch(IOException ioException)
JOptionPane.showMessageDialog(null, "Error writing to file");
return;
public void closeFile()
try
if(output !=null)
output.close();
catch(IOException ioException)
JOptionPane.showMessageDialog(null, "Error Closing File");
System.exit(1);
System.exit(0);
}This isnt the correct forum for this question. Use tags when posting code. Post the contents of the .txt file and what unexpected characters you are getting.
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Error writing to file during iTunes 10.6 installation - Help!!
I am trying to update iTunes to 10.6 but I get 'Error writing to file C:\Config.Msi\1b0f1d.rbf. Verify that you have access to that directory' I am presented with the option to 'Retry' or 'Cancel' after choosing retry on multiple occassions the update will not complete. I have a new pc on Windows 7 Home Premium 64-bit system. I have never had this problem before. Thanks in advance.
Wierdly after persistance it has worked :s not sure how. but I have iTunes 10.6 which is the main thing!
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Hi,
I have made a program that reads a string, converts it to bytes, then writes to a file.
Well i got the first two working, but its not writing to file. I know it should work cos i have written to file on my previous tests, but when i used a FOR loop it stoped working. Do ya know why. Below is the code...
for (int a = 0;a = bytes.length - 1;a++){
of.write(bytes[a]);
System.out.print(" " + bytes[a] + " : " + bytes.length);
My friend told me to use bytes.length - 1 as it is meant to stop the OUTOFBOUNDS error.
OK,
my regards
Below is the whole program, its a bit messy cos i got lots of old code that i have blocked.
import java.io.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.String;
public class sender implements Runnable {
int i= 0;
String mes;
int count =0;
int b = 0;
boolean yes = false;
public static void main (String[] arguments) {
Thread th = new Thread (new sender());
th.start ();
//sender();
//while (true){}
public void run() {
try {
Thread.sleep(100);
} catch (InterruptedException e) {}
String mesdialog = JOptionPane.showInputDialog(null,
"Enter your message");
mes = mesdialog.toString();
try {
//FileOutputStream of = new
//FileOutputStream ("send.txt");
FileWriter of = new
FileWriter("send.txt");
//BufferedReader in = new
// BufferedReader(fr);
//while (true){}
int i = 66;
boolean eof = false;
int inChar = 0;
//String inChar;
byte[] bytes = mes.getBytes();
/* < disable / enable
do {
int n=Integer.MIN_VALUE;
try{
n = Integer.parseInt(mes);
} catch (NumberFormatException nfe){
//inChar = n;
if (inChar != -1) {
byte outChar = (byte)inChar* ;
//char outChar = (char)inChar ;
of.write(outChar);
System.out.println("" + outChar);
//of.write(mes,0,20);
} else
eof = true;
} while (!eof);//*/
for (int a = 0;a = bytes.length - 1;a++){
of.write(bytes[a]);
System.out.print(" " + bytes[a] + " : " + bytes.length);
while (!yes) {
if (bytes[b] == 32 )
yes = true;
else {
of.write(bytes);
System.out.print(" " + bytes[b]);
b++;
//System.exit(0);
//outfile.write(input);
} catch (IOException e) {
System.out.print("AAA ERROR");}your friend was obviously wrong.
for (int a = 0;a = bytes.length - 1;a++){ // that does nothing
of.write(bytes[a]);
System.out.print(" " + bytes[a] + " : " + bytes.length);
}the above "for" loop says :
1:initialize a with 0;
2:do loop while a=bytes.length(<-that's completely wrong. it should be
a boolean expression);
3:for each loop increment "a" by one.
try this:for (int a = 0;a < bytes.length;a++){
of.write(bytes[a]);
System.out.print(" " + bytes[a] + " : " + bytes.length); -
public static void main(String args[]) throws Exception
String str1;
int length;
BufferedReader inpu=new BufferedReader(new InputStreamReader(System.in));;
System.out.println("Enter something: ");
str1=inpu.readLine();
System.out.println("hai"+" "+str1);
i ve used the above code to read an input from the user now i want to write this to a file.plz tell me how to do itya i tried using FileWriter
But is there any other methods
import java.io.*;
class readtofile
public static void main(String args[]) throws Exception
String str1;
int length;
//stream given to inputstream reader then buffered usin buffered reader
BufferedReader inpu=new BufferedReader(new InputStreamReader(System.in));;
System.out.println("Enter something: ");
str1=inpu.readLine();
System.out.println("hai"+" "+str1);
//opening a new file for output
File outfile_1= new File("testout.txt");
//using filewriter class for writing to file
FileWriter out= new FileWriter(outfile_1);
out.write(str1);
out.close();
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Writing to file in JUnit test case? Not working?
I have a singleton class called InstantLogger that internally uses a PrintWriter to write to file. It is very basic, has startLogger(String filename), log(String msg), and stopLogger(). startLogger just creates file, log write to file, and stopLogger closes file.
When I use this class outside of the JUnit test suite it works fine.
As soon as I use it in a JUnit test it does not write to file. It creates the file (this happens in the TestSuite), but will not write anything to it (when log is called from TestCase). I put a System.out in the log function and I see that, but still nothing writing to file. And I will say it again, it does work in non TestCase scenarios so I know it works.
Is there something that could be preventing me from writing to file in JUnit TestCase? Could this be a Singleton Issue?
Thanks,avalanche333 wrote:
I have a singleton class called InstantLogger Ouch.
that internally uses a PrintWriter to write to file. It is very basic, has startLogger(String filename), log(String msg), and stopLogger(). startLogger just creates file, log write to file, and stopLogger closes file.
When I use this class outside of the JUnit test suite it works fine.Oh, brother.
>
As soon as I use it in a JUnit test it does not write to file. It creates the file (this happens in the TestSuite), but will not write anything to it (when log is called from TestCase). I put a System.out in the log function and I see that, but still nothing writing to file. And I will say it again, it does work in non TestCase scenarios so I know it works.
Is there something that could be preventing me from writing to file in JUnit TestCase? Could this be a Singleton Issue?Um, no.
Your code is wrong. You're assuming something that isn't correct. You're also making the assumption that just because it "works" in another context that it's right in all contexts. The two aren't the same, be it configuration or something else.
Singleton? That GoF pattern has been voted off the island. Didn't you hear?
http://code.google.com/p/google-singleton-detector/
% -
Writing to file with ObjectOutputStream
ApartmentWriterProgram asks information about apartments
and saves it to a file.
For some reason it doesnt save information, it writes:
Writing to file "+file+ " failed.
So there happens IOException in the method write(Apartment apartment).
Or in the run().
I dont know what's wrong. Do you?
public class ApartmentFileHandler extends Object implements Serializable {
private OutputStream outStream;
private ObjectOutputStream obStream;
private String filePath;
public ApartmentFileHandler(String filePath) {
this.filePath = filePath;
/** Writes the given apartment data in the file. If the file already
exists, the old contents are overwritten.
Parameters:
apartment - the apartment to be written in the file
Throws:
IOException - if other problems arose when handling the file (e.g. the
file could not be written)
public void write(Apartment apartment)
throws IOException {
outStream = new FileOutputStream(filePath);
obStream = new ObjectOutputStream(outStream);
obStream.writeObject(apartment);
import java.io.*;
import java.util.*;
public class ApartmentWriterProgram
extends Object
private KeyboardReader keyboardReader;
private List roomsInList;
private Room[] rooms;
private int numberOfRooms;
private String file;
public ApartmentWriterProgram()
this.keyboardReader = new KeyboardReader();
this.roomsInList = new ArrayList();
this.rooms = new Room [numberOfRooms];
/** Runs the writer program. The program asks the user for some
apartment data and a file name, and saves the data in the file. */
public void run() {
try {
numberOfRooms = keyboardReader.getInt("Give number of rooms: ");
for (int i =1; i<numberOfRooms+1; i++) {
String type =keyboardReader.getString("Give " +i+ ". " + "type of the room: ");
double area =keyboardReader.getDouble("Give " +i+ ". " + "area of room: ");
Room room= new Room(type, area);
this.roomsInList.add(huone);
roomsInList.toArray(rooms);
Apartment apartment = new Apartment(rooms);
System.out.println();
file = keyboardReader.getString("Give name of the file: ");
ApartmentFileHandler handler = new ApartmentFileHandler(file);
handler.write(apartment);
} catch (IOException ioe) {
System.out.println("Writing to file "+file+ " failed.");
public static void main(String[] args) {
ApartmentWriterProgram program = new ApartmentWriterProgram();
program.run();
}There is nothing to gain in not putting the throws IOException in the write method, since the exception object will have the information about the actual problem.
Is this a typo for the this post? this.roomsInList.add(huone); should be room nes pas.
What exception is actually thrown? To find out useSystem.out.println("Exception: " + ioe);Then wonder why you have the AppartmentFileHandler implement Serializable when you are not writing that object to the file.
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