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The QTSimpleApplet Example

A good starting point for understanding QuickTime for Java is the QTSimpleApplet program from the QuickTime for Java SDK. The code listing for QTSimpleApplet.java is given below:

/*
 * QuickTime for Java SDK Sample Code

   Usage subject to restrictions in SDK License Agreement
 * Copyright:  1996-1999 Apple Computer, Inc.

 */
import java.applet.Applet;
import java.awt.*;
import java.io.*;

import quicktime.*;
import quicktime.io.QTFile;

import quicktime.app.QTFactory;
import quicktime.app.display.*;
import quicktime.app.image.ImageDrawer;	// for exceptions

public class QTSimpleApplet extends Applet {
	private Drawable myQTContent;
	private QTCanvas myQTCanvas;
	
	public void init () {
		try {
			// this is a workaround required by a bug in the loading
			// mechanism of applets using the JavaPlugin on Netscape on Win
			if (QTSession.isInitialized() == false)
				QTSession.open();

				// set up a QTCanvas which will disply its content 
				// at its original size of smaller and centered in the space given
				// to the QTCanvas when the applet is layed out
			setLayout (new BorderLayout());
			myQTCanvas = new QTCanvas (QTCanvas.kInitialSize, 0.5F, 0.5F);
			add (myQTCanvas, "Center");		
			
			QTFile file = new QTFile (getCodeBase().getFile() + getParameter("file"));
			myQTContent = QTFactory.makeDrawable (file);
		} catch (QTException qtE) {
				// something wrong with the content but QT itself is OK
			if (QTSession.isInitialized())
				myQTContent = ImageDrawer.getQTLogo();
			else
				throw new RuntimeException (qtE.getMessage());		
		} catch (FileNotFoundException fnfE) {
			myQTContent = ImageDrawer.getQTLogo();
		
		} catch (IOException ioE) {
				// the IOException would occur as a violation of
				// java security settings on the user machine - throw it again
			throw new SecurityException (ioE.getMessage());
		}
	}	

	public void start () { 
		try { // if QT was not successfully initialized the QTCanvas will be null
			if (myQTCanvas != null)
				myQTCanvas.setClient (myQTContent, true);			
		} catch (QTException e) {
			e.printStackTrace();
		}
	}
	
	public void stop () { 
		if (myQTCanvas != null)
			myQTCanvas.removeClient();
	}
	
	public void destroy () {
		QTSession.close();
	}
}

The out of QTSimpleApplet running in an applet viewer is shown in Fig. 9.1.

{\tt QTSimpleApplet} Output

The things to note about this program are:

The basic operation of the code is as follows:


next up previous
Next: The QuickTime for Java Up: The Quicktime API: A Previous: The Quicktime API: A
Dave Marshall
10/4/2001