FileDocCategorySizeDatePackage
ExecDemoNS.javaAPI DocExample2641Sun Apr 29 13:54:26 BST 2001None

ExecDemoNS

public class ExecDemoNS extends JFrame
ExecDemoNS shows how to execute a 32-bit Windows program from within Java.

Fields Summary
protected static final String
HELPFILE
The name of the help file.
Process
p
A process object tracks one external running process
protected static String
program
The path to the binary executable that we will run
Constructors Summary
public ExecDemoNS(String prog)
Constructor - set up strings and things.

		super("ExecDemo: " + prog);
		String osname = System.getProperty("os.name");
		if (osname == null) 
			throw new IllegalArgumentException("no os.name");
		if (prog.equals("netscape"))
			program = // Windows or UNIX only for now, sorry Mac fans
				(osname.toLowerCase().indexOf("windows")!=-1) ?
				"c:/program files/netscape/communicator/program/netscape.exe" :
				"/usr/local/netscape/netscape";
		else
			program = prog;

		Container cp = getContentPane();
		cp.setLayout(new FlowLayout());
		JButton b;
		cp.add(b=new JButton("Exec"));
		b.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent evt) {
				runProg();
			}
		});
		cp.add(b=new JButton("Wait"));
		b.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent evt) {
				doWait();
			}
		});
		cp.add(b=new JButton("Exit"));
		b.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent evt) {
				System.exit(0);
			}
		});
		pack();
Methods Summary
public voiddoWait()

		try {
			p.waitFor();	// wait for process to complete
			Debug.println("trace", "Process is done");
		} catch (Exception ex) {
			JOptionPane.showMessageDialog(this,
				"Error" + ex, "Error",
				JOptionPane.ERROR_MESSAGE);
		}
public static voidmain(java.lang.String[] av)
main - instantiate and run


	      
	        
		String program = av.length == 0 ? "netscape" : av[0];
		new ExecDemoNS(program).setVisible(true);
public voidrunProg()
Start the help, in its own Thread.


		new Thread() {
			public void run() {

				try {
					// Get the URL for the Help File
					URL helpURL = this.getClass().getClassLoader().
						getResource(HELPFILE);

					// Start Netscape from the Java Application.

					p = Runtime.getRuntime().exec(program + " " + helpURL);

					Debug.println("trace", "In main after exec");

				} catch (Exception ex) {
					JOptionPane.showMessageDialog(ExecDemoNS.this,
						"Error" + ex, "Error",
						JOptionPane.ERROR_MESSAGE);
				}
			}
		}.start();