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Thread: Problem with a waitFor() executing a script

  1. #1
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    Default Problem with a waitFor() executing a script

    The script works fine but stop when it ends...

    Here's the code:

    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    import java.io.*;
    import java.lang.*;

    public class IOD extends JFrame implements ActionListener {

    File f;
    JLabel img;
    JScrollPane sc;

    private ImageIcon createImageIcon(String path) {
    try {

    return new ImageIcon(path);
    }
    catch (Exception e) {
    System.out.println(e.toString());
    return null;
    }
    }

    public void actionPerformed (ActionEvent ae) {
    JButton jb = (JButton) ae.getSource();

    if ( jb.getLabel().equals("Load image") ) { // Load Button
    try {
    JFileChooser fc = new JFileChooser();
    fc.showDialog(this, "Choose Image");
    f = fc.getSelectedFile();
    try {
    img.setVisible(false);
    sc.setVisible(false);
    }
    catch (Exception ex) {}
    img = new JLabel(createImageIcon(f.getAbsolutePath()));
    sc = new JScrollPane(img);
    this.getContentPane().add(sc, BorderLayout.CENTER);
    this.validate();
    }
    catch (Exception e) {}
    }

    if (jb.getLabel().equals("Predict orientation")){ // Predict Button
    try {
    runProcess(f);
    }
    catch (Exception e) {}
    }
    }
    private void runProcess(File f)throws Exception {
    this.f=f;
    File workDir = new File("c:/msys/1.0/bin");
    String[] cmdArray = new String[5];
    String image = new String (f.getName());
    cmdArray[0] = "c:/msys/1.0/bin/bash";
    cmdArray[1] = "--login";
    cmdArray[2] = "-i";
    cmdArray[3] = "-c";
    cmdArray[4] = "Extractor.sh " + image;
    Process p = Runtime.getRuntime().exec(cmdArray, null, workDir);
    StreamPumper out = new StreamPumper(new InputStreamReader(p.getInputStream()));
    StreamPumper err = new StreamPumper(new InputStreamReader(p.getErrorStream()));
    out.start();
    err.start();
    p.waitFor(); // here is the problem
    out.join();
    err.join();

    File workDir2 = new File("c:/tesi");
    String predictor = new String ("c:/tesi/predictor");
    Process predict = Runtime.getRuntime().exec(predictor, null, workDir2);
    StreamPumper out2 = new StreamPumper(new InputStreamReader(p.getInputStream()));
    StreamPumper err2 = new StreamPumper(new InputStreamReader(p.getErrorStream()));
    out2.start();
    err2.start();
    predict.waitFor();
    out2.join();
    err2.join();
    }

    class StreamPumper extends Thread {
    InputStreamReader input;
    StringBuffer buffer;

    StreamPumper(InputStreamReader input) {
    this.input = input;
    buffer = new StringBuffer();
    setDaemon(true);
    }

    public void run() {
    try {
    int c;
    while ((c = input.read()) != -1) {
    char ch = (char)c;
    buffer.append(ch);
    if (ch == '\n') {
    System.out.append(buffer.toString());
    buffer = new StringBuffer();
    }
    }
    }
    catch (Exception e) {
    e.printStackTrace();
    }
    }
    }

    public IOD() { // Frame
    super("Image Orientation Detector");
    JButton open = new JButton("Load image");
    JButton predict = new JButton("Predict orientation");
    this.getContentPane().setLayout(new BorderLayout());
    this.getContentPane().add(open, BorderLayout.NORTH);
    this.getContentPane().add(predict, BorderLayout.SOUTH);
    open.addActionListener(this);
    predict.addActionListener(this);
    this.setSize(300, 300);
    this.setVisible(true);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );

    public static void main (String[] args) throws InterruptedException, IOException{
    IOD d = new IOD();
    }
    }
    Last edited by Baldurian; January 28th, 2010 at 07:51 AM.


  2. #2
    Administrator copeg's Avatar
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    Default Re: Problem with a waitFor() executing a script

    The script works fine but stop when it ends...
    Shouldn't it stop when it ends? Please explain the problem a bit more

  3. #3
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    Default Re: Problem with a waitFor() executing a script

    Quote Originally Posted by copeg View Post
    Shouldn't it stop when it ends? Please explain the problem a bit more
    Problem solved... I have completely removed the first waitFor() and keep the one on the second process. Now everything works fine.

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