Using textarea to write data to html files

Question

Hi. I am trying to make an application to change contents of html files. I used filereader and filewriter constructors but I guess I have a problem with using textarea. I want the data from the file to appear in a textarea so I can edit it and save.
boolean saveFile () {
JTextArea textarea = new JTextArea();
JFrame frame = new JFrame();
frame.add(textarea);
File file = null;
File fFile = new File ("default.java");
JFileChooser fc = new JFileChooser ();
htmlFilter fhtmlFilter = new htmlFilter();
// Start in current directory
fc.setCurrentDirectory (new File ("."));
// Set filter for Java source files.
fc.setFileFilter (fhtmlFilter);
// Set to a default name for save.
fc.setSelectedFile (fFile);
// Open chooser dialog
int result = fc.showSaveDialog (this);
if (result == JFileChooser.CANCEL_OPTION) {
return true;
} else if (result == JFileChooser.APPROVE_OPTION) {
fFile = fc.getSelectedFile ();
return writeFile (file,textarea.getText);
return true;
// saveFile
boolean openFile () {
htmlFilter fhtmlFilter= new htmlFilter();
File file = new File("");
JTextArea textarea = new JTextArea();
JFileChooser fc = new JFileChooser ();
fc.setDialogTitle ("Open File");
// Choose only files, not directories
fc.setFileSelectionMode ( JFileChooser.FILES_ONLY);
// Start in current directory
fc.setCurrentDirectory (new File ("."));
// Set filter for Java source files.
fc.setFileFilter (fhtmlFilter);
// Now open chooser
int result = fc.showOpenDialog (this);
if (result == JFileChooser.CANCEL_OPTION) {
return true;
} else if (result == JFileChooser.APPROVE_OPTION) {
file = fc.getSelectedFile ();
JFrame frame= new JFrame();
frame.add(textarea);
frame.pack();
frame.setVisible(true);
// Invoke the readFile method in this class
return writeFile (file, textarea.getText ());
return true;
} // openFile
public static boolean writeFile (File file, String dataString) {
try {
PrintWriter out =
new PrintWriter (new BufferedWriter (new FileWriter (file)));
out.print (dataString);
out.flush ();
out.close ();
catch (IOException e) {
return true;
} // writeFile
public String readFile(File file)
JFrame frame= new JFrame();
JTextArea textarea = new JTextArea();
frame.add(textarea);
StringBuffer contents = new StringBuffer();
//declared here only to make visible to finally clause
BufferedReader input = null;
try {
//use buffering, reading one line at a time
//FileReader always assumes default encoding is OK!
input = new BufferedReader( new FileReader(file) );
String line; //not declared within while loop
* readLine is a bit quirky :
* it returns the content of a line MINUS the newline.
* it returns null only for the END of the stream.
* it returns an empty String if two newlines appear in a row.
while (( line = input.readLine()) != null){
System.out.println(line);
catch (FileNotFoundException ex) {
ex.printStackTrace();
catch (IOException ex){
ex.printStackTrace();
finally {
try {
if (input!= null) {
//flush and close both "input" and its underlying FileReader
input.close();
catch (IOException ex) {
ex.printStackTrace();
return contents.toString();
}

Answer 1

Sorry this didn't get a response sooner. You can alter the way your consumer loop writes the data to file by altering the data that you send through the queue. I would suggest clustering your data (the array you currently send) with an array of booleans. Then you can unbundle this cluster in the consumer loop before you write to file and use it accordingly. This should allow you to do what you're trying to do.
Just to give you some feedback on your code, there are few things that you can improve upon. I'm sure this is a learning process so you probably know a lot more about LabVIEW now than you did when you started.
All of your array operations in there can be done much simpler. You have a whole Index Array node that inputs 8-21 in order. This can be done by simply having an 8 at the beginning and dragging the rest down since the indices always count from the previous by default. You are also doing a lot of indexing and re-building of arrays. You should look int o Array Subset VI  and Array To Cluster node to consolidate here.
You have a lot of indicators and controls that coudl be consolidated in to array and/or clusters. Your "element 1", "element 2", etc  indicators are all displayed on the front panel next to each other, so why not just display them as an array?
You use property nodes in a couple places to read the values. This can be better done by a local variable. Property nodes shouldn't usually be read from continuously.