Writing binary files & trouble with no unsigned byte type
I've got a fair amount of Java experience, enough to know what I'm doing most of the time but I do have a vast experience with C & C++ which helps my Java. I've stumbled across a problem when trying to write out files in binary.
If I was to write out a binary file, I would always choose C/C++ to do this because simply because I'm at ease with the implementation.
I've now written a Java program which needs to output a file in binary and I'm having real issues doing the most simple things because of no unsigned support.
I want to write out elements byte-by-byte and make use of the 8-bits provided in the byte type in Java.
Let's assume I've done my processing and I end up with an int. I know that this int is 0-255 in value. I now want to pack it into a byte and write it to my file. How do I go about assigning the byte without Java 'converting' it to a signed byte? I simply want to copy the lower 8-bits of the int and duplicate them into the byte variable - no conversion.
In C you would do something like this:
char mySignedChar = *( (char*)&(unsigned char)myInt ) );
What's the Java equivalent? Am I going about this the right way?
Whether a byte is signed or unsigned only matters if one is doing arithmetic on it. If the int is 0-255 then you just cast to a byte using
byte theByte = (byte)theIntValue;When reading back you just use
int theByteAsAnInt = theByte & 0xff;
Similar Messages
-
I would like to read in and write physiological data files which were saved by BioPac�s AcqKnowledge 3.8.1 software, in conjunction with their MP150 acquisition system. To start with, I�d like to write a converter from different physiodata file format into the AcqKnowledge binary file format for version 3.5 � 3.7 (including 3.7.3). It will allow us to read different file format into an analysis package which can only read in file written by AcqKnowledge version 3.5 � 3.7 (including 3.7.3).
I attempted to write a reader following the Application Note AS156 entitled �AcqKnowledge File Format for PC with Windows� (see http://biopac.com/AppNotes/ app156Fi
leFormat/FileFormat.htm ). Note the link for the Mac File format is very instructive too - it is presented in a different style and might make sense to some people with C library like look (http://biopac.com/AppNotes/ app155macffmt/macff.htm).
I guess the problem I had was that I could not manage to read all the different byte data stream with File.vi. This is easy in C but I did not get very far in LabView 7.0. Also, I was a little unsure which LabView data types correspond to int, char , short, long, double, byte, RGB and Rect. And, since it is for PC I am also assuming the data to be written as �little endian� integer, and thus I also used byte swap vi.
Two samples *.acq binary files are attach to this post to the list. Demo.acq is for version 3.7-3.7.2, while SCR_EKGtest1b.acq was recorded and saved with AcqKnowledge 3.8.1, which version number is 41.
I would be grateful if you someone could explain how to handle such binary file stream with LabView and send an example to i
llustrate it.
Many thanks in advance for your help.
Donat-Pierre
Attachments:
Demo.acq 248 KB
SCR_EKG_test1b.acq 97 KBThe reading of double is also straight forward : just use a dble float wired to the type cast node, after inverting the string (indian conversion).
See the attached example.
The measure of skin thickness is based on OCT (optical coherent tomography = interferometry) : an optical fiber system send and received light emitted to/back from the skin at a few centimeter distance. A profile of skin structure is then computed from the optical signal.
CC
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...
Attachments:
Read_AK_time_info.vi.zip 9 KB -
I would like to read in and write physiological data which was saved by Biopac�s AcqKnowledge 3.8.1 software, in conjunction with their MP150 acquisition system. To start with, I�d like to write a converter from different physiodata file format into the AcqKnowledge binary file format for version 3.5 � 3.7 (including 3.7.3). It will allow us to read different file format into an analysis package which can only read in file written by AcqKnowledge version 3.5 � 3.7 (including 3.7.3).
I attempted to write a reader following the Application Note AS156 entitled �AcqKnowledge File Format for PC with Windows� (see http://biopac.com/AppNotes/app156FileFormat/FileFormat.h
tm ). Note the link for the Mac File format is very instructive too - it is presented in a different style and might make sense to some people with C library like look (http://biopac.com/AppNotes/app155macffmt/macff.htm) .
I guess the problem I had was that I could not manage to read all the different byte data stream with File.vi. This is easy in C but I did not get very far in LabView 7.0. Also, because it is for PC I am assuming the data to be written as �little endian� integer, and thus I also used byte swap vi.
I would be grateful if you someone could explain how to handle such binary file stream with LabView and send an example to illustrate it.
Many thanks in advance for your help.
Donat-PierreOne more step...
short are U16 integer
double are double precision float
bool seem to be 2 bytes (= U16)
char are string (variable length)
rgb are U16 integer, with high order byte = 0
rect should be 4 x U16 (top, left, bottom, right)
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left... -
Hi there,
Here is something I never did, so a little help is welcome
I have a binary file made with VB and I want to read it with LabVIEW 8.5.
I know the structure of the records in the file, it's something like:
str1 As String * 5
str2 As String * 6
str3 As String * 2
date As Date
str4 As String * 20
str5 As String * 20
int1 As Integer
flt1 As Single
flt2 As Single
flt3 As Single
and so on.
Further on there's even a 2D array: 3 rows, 400 cols of singles.
The total length of one record is 5120 bytes.
I can pick up whatever record from the file using the "Set file positions" & "Read from binary file" vi's but how do I convert those 5120 bytes in the correct structure?
I was thinking of a cluster but how do I define a fix string length in LV?
Also, is a cluster the right way to go?
So, like I said any help is welcome
ThanksAlain S wrote:
I was thinking of a cluster but how do I define a fix string length in LV?
Also, is a cluster the right way to go?
So, like I said any help is welcome
Thanks
Defining a fixed sized string officially not possible, and even the non official way will get you bugs, so let's do the official route.
First open up the file with a hex editor, I normally use the Total Commander's built in F3, and then hit '3' to get a hex view. In that view I check wheter the lenght of the string is prepended to the string (Pascal and LabVIEW style) or ended with a Null (C style).
If none of them is happening, I would use a cluster of 5 U8's to get the string, convert this cluster to an array, and convert that to a string.
I have no idea what a 'Date' representation is in VB.
A cluster is very suitable for this task, however I do not get the info about the 2D array, if you could add a data file that would be very helpfull.
Ton
Message Edited by TonP on 28-08-2009 08:44 PM
Free Code Capture Tool! Version 2.1.3 with comments, web-upload, back-save and snippets!
Nederlandse LabVIEW user groep www.lvug.nl
My LabVIEW Ideas
LabVIEW, programming like it should be! -
Problem writing binary files with LV 8.5. I have one VI that does all the interaction/file I/O and another VI for testing. I find when I run the subVI where all the data reading/writing is happening with break points and single stepping through the code all is OK, but when I run normally the files are much larger than they should be and as well when I close the files I get a error. Any insights?
WalterWaltz wrote:
I found the problem, I was actually trying to close the files twice.
I don't see how this could cause the symptoms you described in the first post.
(It only explains the error on close).
LabVIEW Champion . Do more with less code and in less time . -
Binary file read with bit offset..not byte offset.
hi,
i want to read a binary file with some offset ..not in bytes... offset in bits..my data is a single bit data stream size of 1GB ,after skipping particular bit offset i want to read the data in byte order..
Indrajit
| [email protected] | [email protected] .hi , Gerd W
i am not able to follow your answer.... here with i attached a file to describe my query more clearly. Actually two channels of 1 bit data stream stored in two different files ,and the file size will be more than 10 GB.
i want to delay the channel B by 3 bits and i want to perform bitwise operation between channel A and shifted version of channel B..till the end of the data..
now i am doing this without applying any delay by choosing a small block by block which corresponds to 1 sec of data .
Indrajit
| [email protected] | [email protected] .
Attachments:
bitwsie.png 16 KB
bitwsie.jpg 52 KB -
Writing binary file - random places
Hi,
I want to write to random places inside a binary file using powershell.
something like a function write(position,value)
Original file content "0123456789"
write(1,2) -> file is now "0223456789"
write(6,2) -> file is now "0223452789"
write(end,12345) -> file is now "022345278912345"
Is something like this possible? And how? Does somebody have any linkes for me to follow.
With kind regards,
Maurice LucasThe example is text. You cannot write to a binary file using text.
We would open the file as a binary stream and use file seek methods.
A binary file has only 1s and 0s. They may look like hex in a binary editor.
See:
http://msdn.microsoft.com/en-us/library/d3wke8tz(v=vs.110).aspx
Binary is written to by byte position and buffer length.
¯\_(ツ)_/¯ -
New to Applets: Problems wiht writing to files and with scroll panes.
Hi, I've recently graduated from university and so I have limited experience in java programming and I'm having some trouble with JApplets (this is the first time I've made one). I'm trying to make a simple program that will allow users to pick one of a few background images from a list (a list of jpanels within a scroll pane) then at the click of a button will output a CSS with the background tag set to the image location. This is for use on a microsoft sharepoint site where each user has a My-Sit area which I want to be customizable.
So far I've been creating this program as an application rather than a JApplet and just having another class that extends the JApplet Class which then displays the JFrame from the GUI Class. This initially didnt work because I was trying to add a window to a container so I kept programming it as an application until I got it working before trying to convert it to a JApplet. I solved the previous problem by changing my GUI class to extend JPanel instead of JFrame and it now displays correctly but with a coupe of issues.
Firstly the applet will not create/write to the CSS file. I read that applets couldnt read/write to the users file system but they could to their own. The file I wish to write to is kept on the same machine as the applet so I'm not sure why this isn't working.
Secondly the scroll panel is no longer working properly. This worked fine when I was still running the program as an application when the GUI still extended JFrame instead of JPanel (incidentally the program no longer runs as an application in this state) but now the scroll bar does not appear. This is a problem since I want the applet to remain the same size on the page even if I decide to add more backgrounds to the list. I tried setting the applet height/width to smaller values in the html file to see if the scroll bar would appear if the area was smaller than the GUI should be, but this just meant the bottom off the applet was cut off.
Could anyone offer any suggestion as to why these thigns arnt working and how to fix them? If necessary I can post my source code here. Thanks in advance.Ok, well my program is made up of 4 classes, I hope this isnt too much to be posting. If any explaination is needed then I'll post that next. Theres lots of print lines scattered aroudn due to me trying to fix this and theres some stuff commented out from when the program used to be an application isntead of an applet.
GUI Class, this was the main class until I made a JApplet Class
public class AppletGUI extends JPanel{
*GUI Components*
//JFrames
JFrame mainGUIFrame = new JFrame();
JFrame changeBackgroundFrame = new JFrame();
//JPanels (Sub-panels are indented)
JPanel changeBackgroundJP = new JPanel(new BorderLayout());
JPanel changeBackgroundBottomJP = new JPanel(new GridLayout(1,2));
JPanel backgroundJP = new JPanel(new GridLayout(1,2));
JPanel selectBackground = new JPanel(new GridLayout(1,2));
//Jbuttons
JButton changeBackgroundJB = new JButton("Change Background");
JButton defaultStyleJB = new JButton("Reset Style");
//JLabels
JLabel changeBackgroundJL = new JLabel("Choose a Background from the Menu");
JLabel backgroundJL = new JLabel();
//JScrollPane
JScrollPane backgroundList = new JScrollPane();
JPanel backgroundListPanel = new JPanel(new GridLayout());
//Action Listeners
ButtonListener bttnLstnr = new ButtonListener();
//Controllers
CSSGenerator cssGenerator = new CSSGenerator();
Backgrounds backgroundsController = new Backgrounds();
backgroundMouseListener bgMouseListener = new backgroundMouseListener();
//Flags
Component selectedComponent = null;
*Colour Changer*
//this method is used to change the colour of a selected JP
//selected JPs have their background darkered and when a
//different JP is selected the previously seleced JP has its
//colour changed back to it's original.
public void changeColour(JPanel theJPanel, boolean isDarker){
//set selected JP to a different colour
Color tempColor = theJPanel.getBackground();
if(isDarker){
tempColor = tempColor.darker();
else{
tempColor = tempColor.brighter();
theJPanel.setBackground(tempColor);
//also find any sub-JPs and change their colour to match
int j = theJPanel.getComponents().length;
for(int i = 0; i < j; i++){
String componentType = theJPanel.getComponent(i).getClass().getSimpleName();
if(componentType.equals("JPanel")){
theJPanel.getComponent(i).setBackground(tempColor);
*Populating the GUI*
//backgroundList.add();
//Populating the Backgrounds List
*Set Component Size Method*
public void setComponentSize(Component component, int width, int height){
Dimension tempSize = new Dimension(width, height);
component.setSize(tempSize);
component.setMinimumSize(tempSize);
component.setPreferredSize(tempSize);
component.setMaximumSize(tempSize);
*Constructor*
public AppletGUI() {
//REMOVED CODE
//AppletGUI.setDefaultLookAndFeelDecorated(true);
//Component Sizes
//setComponentSize
//Adding Action Listeners to Components
System.out.println("adding actions listeners to components");
changeBackgroundJB.addActionListener(bttnLstnr);
defaultStyleJB.addActionListener(bttnLstnr);
//Populating the Change Background Menu
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! -
Writing Binary files from PL/SQL
Hi Group,
I wish to read tables in Oracle and write them in to Binary files in a predefined format, Can any one help me How to write binary data from within PL/SQL.
UTL_FILE package has support to .txt files only, is there any other way to deal with this problem.You can write ActiveX COM components and use Oracle COM Automation too. I plan to do some experiments later in the summer.
-
Writing binary files in block mode?
I am sampling two channels in continuous mode using labview basic version. I would like to take the two arrays of values as I am sampling them and write them out in block mode to a binary file. What's the best way to do that?
Open or create a file for write before daq starts, then continuously write data to the file, and close it after the daq is stopped. Make sure each column of the data array is each channel, so an Array transpose might be needed.
-Joe
Attachments:
Snap8.gif 8 KB -
Writing binary file for fixed amount of time
Hello, I'm trying to write a binary file of multiple channels for a fixed amount of time before I perform my analysis. Does anyone know the best way to accomplish this?
Here is an example of one way to do what I think you are trying to do. There may be a more elegant way of doing it, but this is pretty simple and straight-forward. It basically writes a 5-integer array for 5 seconds and then stops. Let me know if you have any questions.
Attachments:
timed write.vi 27 KB -
Problems with writing to file, and with ActionListener.
I have been trying to write a Payroll Division type program as my school Computer Science Project. However, I have a few problems with it...
import java.io.IOException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.StringTokenizer;
import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.*;
public class Personnel implements ActionListener {
JFrame GUIFrame;
JLabel ID, Line, OKText,AnswerField;
JTextField IDField, LineField;
JButton OK;
JPanel GUIPanel;
int trialCounter=0;
final static int employeeNumber = 7;
final static int maxValue = ((employeeNumber*4)-1);
//Number of employees, which would be in real life passed by the Payroll division.
public static String [][] sortHelp = new String [employeeNumber+1][3]; /** Creates a new instance of Personnel */
public Personnel() {
GUIFrame = new JFrame("PersonnelSoft"); //create title header.
GUIFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GUIFrame.setSize(new Dimension(100, 140));
GUIPanel= new JPanel(new GridLayout(2, 2));
addWidgets();
GUIFrame.getRootPane().setDefaultButton(OK);
GUIFrame.getContentPane().add(GUIPanel, BorderLayout.CENTER);
GUIFrame.pack();
GUIFrame.getContentPane().setVisible(true);
GUIFrame.setVisible(true);
private void addWidgets() {
ID = new JLabel ("Please enter your employee Identification Number:", SwingConstants.LEFT);
IDField = new JTextField ("ID", 5);
Line = new JLabel ("Please enter the line of your payroll with which you have concerns:", SwingConstants.LEFT);
LineField = new JTextField ("###", 2);
OKText = new JLabel ("Click OK when you have verified the validity of your request", SwingConstants.LEFT);
OK = new JButton ("OK");
OK.setVerticalTextPosition(AbstractButton.CENTER);
OK.setMnemonic(KeyEvent.VK_I);
AnswerField = new JLabel("The Result of your Querie will go here", SwingConstants.LEFT);
GUIPanel.add(ID);
GUIPanel.add(IDField);
GUIPanel.add(Line);
GUIPanel.add(LineField);
GUIPanel.add(OKText);
GUIPanel.add(OK);
GUIPanel.add(AnswerField);
OK.addActionListener(this);
ID.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
OKText.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
Line.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
public static void ArrayCreate() throws IOException {
//creates a employeeNumber x 3 array, which will hold all data neccessary for future sorting by employee ID number.
int counter = 2;
int empCounter = 1;
String save;
//avoid having to waste memory calculating this value every time the for loop begins
FileInputStream inFile = new FileInputStream("C:\\Documents and Settings\\Abraham\\humanresource4\\src\\humanresource4\\HR.txt");
BufferedReader in = new BufferedReader(new InputStreamReader(inFile));
String line;
line = in.readLine();
StringTokenizer st = new StringTokenizer(line);
save = st.nextToken();
sortHelp[0][0] = save;
sortHelp[0][2] = save;
while (st.hasMoreTokens()) {
save = st.nextToken();
sortHelp[0][1] = save;
while (counter <= maxValue) {
line = in.readLine();
if (((counter - 1) % 4) == 0) {
st = new StringTokenizer(line);
sortHelp[empCounter][0] = st.nextToken();
sortHelp[empCounter][2] = sortHelp[empCounter][0];
while (st.hasMoreTokens()) {
save = st.nextToken();
sortHelp[empCounter][1] = save;
empCounter++;
counter++;
public static String[] joinString() {
String[] tempStorage = new String[employeeNumber+1];
int counter;
for (counter = 0; counter <= employeeNumber; counter++) {
tempStorage[counter] = (sortHelp[counter][1] + sortHelp[counter][0]);
return (tempStorage);
public static String[] sortEm(String[] array, int len)
java.util.Arrays.sort(array);
return array;
public static void splitString(String[] splitString){
int counter;
for (counter = 0; counter <= employeeNumber; counter++){
sortHelp[counter][0]=splitString[counter].substring( 5 );
sortHelp[counter][1]=splitString[counter].substring(0,5);
void setLabel(String newText) {
AnswerField.setText(newText);
void writetoHR(String local) throws IOException {
FileOutputStream outFile = new FileOutputStream ("C:\\Documents and Settings\\Abraham\\humanresource4\\src\\humanresource4\\HR2.txt");
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(outFile));
out.write(local+"the preceding employee number is not in our database, but has submitted a request. Please sort out the issue");
System.exit(0);
public void actionPerformed(ActionEvent e){
boolean flag=false;
String local=IDField.getText();
int i=0;
while((i<=employeeNumber)&&(flag==false)){
if (sortHelp[1]==local) {
flag=true;
i++;
trialCounter++;
if (trialCounter>=3)
writetoHR(local);
if (flag==false)
setLabel("Your ID number does not exist in our records. Verify your ID and try again.");
else {
switch (LineField.getText())
case 04:
setLabel("Your pay is calculated by multiplying your working hours by the amount per hour. If both of these fields are satisfactory to you, please contact humanresource");
break;
case 03:
setLabel("Hourly amount was calculated by the system, by dividing your yearly pay 26 and then 80.");
break;
case 07:
setLabel("Overtime pay was calculated by multiplying regular hourly pay by 1.1");
break;
case 06:
setLabel("The overtime hourly pay was multiplied by the amount of overtime hours.");
break;
case 10:
setLabel("For holiday hours, your pay is increased by 25%.");
break;
case 09:
setLabel("The holiday hourly pay was multiplied by your amount of holiday hours.");
break;
case 11:
setLabel("Your total pay was calculated by adding all the separate types of payment to your name.");
break;
case 17:
setLabel("Your net pay was found by subtracting the amount withheld from your account");
break;
case 19:
setLabel("Your sick hours remaining were taken from a pool of 96 hours.");
break;
default:
setLabel("Please contact humanresource.");
break;
private static void CreateAndShowGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
Personnel GUI = new Personnel();
public static void main(String[] args) throws IOException {
String[] temporary = new String[employeeNumber];
ArrayCreate();
temporary = joinString();
temporary = sortEm(temporary, employeeNumber);
splitString(temporary);
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
CreateAndShowGUI();
int row;
int column;
for (row = 0; row < (employeeNumber); row++) { // verify proper output by ArrayCreate splitString
for (column = 0; column <= 2; column++) {
System.out.print(sortHelp[row][column]);
System.out.print(' ');
System.out.print(' ');
System.out.println();
1) It does not permit me to switch on a String. How do I solve that?
2)How would I throw an exception (IO) within actionperformed?
3)Generally, if cut it down to everything except the writing to a file part, the actionperformed script causes an error... why?
Thanks in advance.
And sorry for the relative lameness of my question...
---abe---Thank you very much. That did solve almost all the problems that I had...
I just have one more problem.
First (here's the new code):
import java.io.IOException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.StringTokenizer;
import javax.swing.*;
import java.util.*;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.*;
public class Personnel implements ActionListener {
JFrame GUIFrame;
JLabel ID, Line, OKText,AnswerField;
JTextField IDField, LineField;
JButton OK;
JPanel GUIPanel;
int trialCounter=0;
final static int employeeNumber = 7;
final static int maxValue = ((employeeNumber*4)-1);
public static String [][] sortHelp = new String [employeeNumber+1][3];
public Personnel() {
GUIFrame = new JFrame("PersonnelSoft"); //create title header.
GUIFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GUIFrame.setSize(new Dimension(100, 140));
GUIPanel= new JPanel(new GridLayout(2, 2));
addWidgets();
GUIFrame.getRootPane().setDefaultButton(OK);
GUIFrame.getContentPane().add(GUIPanel, BorderLayout.CENTER);
GUIFrame.pack();
GUIFrame.getContentPane().setVisible(true);
GUIFrame.setVisible(true);
private void addWidgets() {
ID = new JLabel ("Please enter your employee Identification Number:", SwingConstants.LEFT);
IDField = new JTextField ("ID", 5);
Line = new JLabel ("Please enter the line of your payroll with which you have concerns:", SwingConstants.LEFT);
LineField = new JTextField ("###", 2);
OKText = new JLabel ("Click OK when you have verified the validity of your request", SwingConstants.LEFT);
OK = new JButton ("OK");
OK.setVerticalTextPosition(AbstractButton.CENTER);
OK.setMnemonic(KeyEvent.VK_I);
AnswerField = new JLabel("The Result of your Querie will go here", SwingConstants.LEFT);
GUIPanel.add(ID);
GUIPanel.add(IDField);
GUIPanel.add(Line);
GUIPanel.add(LineField);
GUIPanel.add(OKText);
GUIPanel.add(OK);
GUIPanel.add(AnswerField);
OK.addActionListener(this);
ID.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
OKText.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
Line.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
public static void ArrayCreate() throws IOException {
int counter = 2;
int empCounter = 1;
String save;
FileInputStream inFile = new FileInputStream("C:\\Documents and Settings\\Abraham\\humanresource4\\src\\humanresource4\\HR.txt");
BufferedReader in = new BufferedReader(new InputStreamReader(inFile));
String line;
line = in.readLine();
StringTokenizer st = new StringTokenizer(line);
save = st.nextToken();
sortHelp[0][0] = save;
sortHelp[0][2] = save;
while (st.hasMoreTokens()) {
save = st.nextToken();
sortHelp[0][1] = save;
while (counter <= maxValue) {
line = in.readLine();
if (((counter - 1) % 4) == 0) {
st = new StringTokenizer(line);
sortHelp[empCounter][0] = st.nextToken();
sortHelp[empCounter][2] = sortHelp[empCounter][0];
while (st.hasMoreTokens()) {
save = st.nextToken();
sortHelp[empCounter][1] = save;
empCounter++;
counter++;
public static String[] joinString() {
String[] tempStorage = new String[employeeNumber+1];
int counter;
for (counter = 0; counter <= employeeNumber; counter++) {
tempStorage[counter] = (sortHelp[counter][1] + sortHelp[counter][0]);
return (tempStorage);
public static String[] sortEm(String[] array, int len)
java.util.Arrays.sort(array);
return array;
public static void splitString(String[] splitString){
int counter;
for (counter = 0; counter <= employeeNumber; counter++){
sortHelp[counter][0]=splitString[counter].substring( 5 );
sortHelp[counter][1]=splitString[counter].substring(0,5);
void setLabel(String newText) {
AnswerField.setText(newText);
void writetoHR(String local) throws IOException {
FileOutputStream outFile = new FileOutputStream ("C:\\Documents and Settings\\Abraham\\humanresource4\\src\\humanresource4\\HR2.txt");
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(outFile));
out.write(local+"the preceding employee number is not in our database, but has submitted a request. Please sort out the issue");
System.exit(0);
public void actionPerformed(ActionEvent e){
boolean flag=false;
String local=IDField.getText();
local trim();
int i=0;
while((i<employeeNumber)&&(flag==false)){
if (sortHelp[1]==local) {
flag=true;
else {
i++;
trialCounter++;
if (trialCounter>=3)
try {
writetoHR(local);
} catch (IOException exception) {
setLabel("We are sorry. The program has encountered an unexpected error and must now close");
} finally {
if (flag==false)
setLabel("Your ID number does not exist in our records. Verify your ID and try again.");
else {
final Map m = new HashMap();
m.put("04","Your pay is calculated by multiplying your working hours by the amount per hour. If both of these fields are satisfactory to you, please contact humanresource.");
m.put("03", "Hourly amount was calculated by the system, by dividing your yearly pay 26 and then 80.");
m.put("07", "Overtime pay was calculated by multiplying regular hourly pay by 1.1");
m.put("06", "The overtime hourly pay was multiplied by the amount of overtime hours.");
m.put("10", "For holiday hours, your pay is increased by 25%.");
m.put("09", "The holiday hourly pay was multiplied by your amount of holiday hours.");
m.put("11", "Your total pay was calculated by adding all the separate types of payment to your name.");
m.put("17", "Your net pay was found by subtracting the amount withheld from your account.");
m.put("19", "Your sick hours remaining were taken from a pool of 96 hours.");
setLabel(m.get(LineField.getText()));
private static void CreateAndShowGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
Personnel GUI = new Personnel();
public static void main(String[] args) throws IOException {
String[] temporary = new String[employeeNumber];
ArrayCreate();
temporary = joinString();
temporary = sortEm(temporary, employeeNumber);
splitString(temporary);
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
CreateAndShowGUI();
int row;
int column;
for (row = 0; row < (employeeNumber); row++) { // verify proper output by ArrayCreate splitString
for (column = 0; column <= 2; column++) {
System.out.print(sortHelp[row][column]);
System.out.print(' ');
System.out.print(' ');
System.out.println();
Now that code above produces two errors. First of all.
local trim();produces the error:
Syntax error, insert "AssignmentOperator ArrayInitializer" to complete ArrayInitializerAssignementSecondly, if I take that into comments, the line
setLabel(m.get(LineField.getText()));Produces the error:
The method setLabel(String) in the type Personnel is not applicable for the arguments (Object)If anybody could help me solve these, I would be sincerely thankfull.
Now, before anybody asks as to why I want to trim the String in the first place, it is due to the fact that I compare it to another String that is without whitespaces. Thus the field that DOES have whitespaces was preventing me from launching into the if loop:
if (sortHelp[1]==local) {
flag=true;
(within actionperformed) Or at least that's my explanation as to why the loop never launched. If it is wrong, can somebody please explain?)
I apologize for the horrible indentation and lack of comments. This is an unfinished version.. I'll be adding the comments last (won't that be a joy), as well as looking for things to cut down on and make the program more efficient.
Anyways,
Thanks in Advance,
---abe--- -
Hi
I am facing problem with writing binary file as .raw file. I have attached my VI please let me know whether I am mistaking with creating and writing files. I will appreciate your help.
Thanks
Attachments:
writing_binary file.vi 67 KBYour actual writing of the file looks fine to me. If you wanted to make it a little simpler, you could actually not use the File Open and the File Close functions. You can wire the path straight into the Write Binary File and if you don't wire the file reference out, it will close the file. Were you having problems with something?
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines -
Hi gurus,
I am getting binary file as base64binary (not a text/xml file) in a request XML tag. I need to write this file to a file directory with the file adapter after retrieving it from the request message by a message/java mapping and use another field in XML as the file name.
I followed the blog `how to send binary data through PI` but in that case, the request message is also the same. Mine requires a mapping to be executed and in this case I cannot use dummy names for message types/interfaces as Enterprise Repository development is required.
How can I achieve this?
Thanks
GokhanJust solved the problem actually
As I was trying to write a binary file directly with the receiver file adapter, I wasn't sure how to define a data type / message type for it. I developed a java mapping that decodes the base64 to binary data and writes it to the output stream, and used a dummy message type / data type for the service interface as the target in Operation Mapping
And it worked!
Regards,
Gökhan -
Bug in LV8 : 'Save for previous version' and 'Write to Binary File' VI
Hello
I am using LabVIEW 8's revamped 'Write to Binary File' VI with a 'TRUE' boolean constant wired to the optional 'prepend array or string size?' to write non-trivial structures to a binary file. I then read the file with the 'Read from Binary File' VI and everything is fine. I don't wire anything to the 'file (use dialog)' input (don't know if this can help).
However, after saving my VI for LabVIEW 7.1, I cannot read the binary files created with the LV7 version of the VI anymore. After examining the LV7 converted version of the VI, there is a 'FALSE' boolean constant that is wired to the equivalent of the 'prepend array or string size' input, which breaks the binary format that is expected.
The attached files are LV8 and 'saved for LV7' versions of a dummy VI that writes an array of 5 integers into a binary file. To test the bug, start LV8, open the LV8 version, run it and create a 'test-lv8.bin' file, then open the LV7 version, run it and create a 'test-lv7.bin' file. Check the content of the two files : the size of the array is indeed missing from the 'test-lv7.bin' file, which can be assimilated as a bug in my opinion.
I think I found another one too : if in LV8 I wire the 'cancelled' boolean output of the 'Open/Create/Replace file' to the selector of a case structure, the 'converted to LV7' version VI will have an error, saying the Case Structure selector is not wired.
Could someone please confirm these are indeed bugs ?
Thanks in advance and have a nice day.
Eric Batut
Attachments:
Test Binary File v7-v8 LV7.vi 15 KB
Test Binary File v7-v8 LV8.vi 7 KBI'm using LV8.6 and need to read a .bin file created in MATLAB. This file obviously does not contain the 4 byte header that LabVIEW prepends .bin files with. So when I use Read from Binary File, I get no data (I'm trying to read an array of doubles). I've tried making my .bin file both in native and big-endian format and changing the representation (double, int64, float64) but none of this works. I noted that if I create the same array in a .bin file in LabVIEW and wire a FALSE to the "prepend array or string size?", my VI for reading .bin files can't read this file either.
Any work-arounds here?
(I'll try attaching my write & read VI's)
Attachments:
ReadWriteBinFile.zip 19 KB
Maybe you are looking for
-
Hi Friends In order to avoid over delivery , in 0VLP , we made configuration setting for delivery item category .(Check overdelivery B Situation rejected with an error). In scheduling agreement , there are 5 line items , quantity for each line item
-
Programatically pprove/Disapprove user decision step in a waiting workflow.
Hi Experts, If I have the approval step work item ID,can I programetically resume the waiting workflow by providing the input (approve disapprove). The use case is that the workflow is started. The workflow has a approval step and it is now waiting f
-
Hi All, We have a requirement of creating an AME setup for Cost center and category approval. The requirement is that, for a PO Requisition header, the approval must be routed dynamically on the basis of requisition total at header level. A header ma
-
F9N1 - Bank Account statement does not generate FINSTA IDOC
Hi SAP guru, Could any of you advise me what I am missing?? I am currenly experiencing the issue relating to the generation of FINSTA IDOC within IHC (which was not experienced in March). ALE is established correctly and current account contain the t
-
Synching outlook appointments with iphone
Where are the instructions on how to synch my MS Outlook calendar appointments with my iPhone?