Question

Crc corruption when attempting to create java.awt.image.

Asked by: htj

I get an odd exception when my applet attempts to create a java.awt.image from a PNG file. I can't see what it is that I'm doing wrong :(

This is the interesting bit of the stack trace:
sun.awt.image.PNGImageDecoder$PNGException: crc corruption
      at sun.awt.image.PNGImageDecoder.getChunk(PNGImageDecoder.java:719)
      at sun.awt.image.PNGImageDecoder.getData(PNGImageDecoder.java:727)
      at sun.awt.image.PNGImageDecoder.produceImage(PNGImageDecoder.java:249)
      at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:257)
      at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:168)
      at sun.awt.image.ImageFetcher.run(ImageFetcher.java:136)

I write out the buffer length that I get from the inputstream, and it is the same size as the PNG file. So I assume that my code has read all of the available data.

I've shortened the code that does this below, removing only the printStrackTrace() calls and log messages.

    String s = "image.png";
    InputStream in = getClass().getResourceAsStream(s);
    if (in == null) {
      System.err.println("Error. " + s + " file missing");
    }
    try {
      buffer = new byte[in.available()];
    } catch (IOException e) {
      System.err.println("Error. " + s + " size count error");
    }
    try {
      in.read(buffer);
    } catch (IOException e) {
      System.err.println("Error. " + s + " read error");
    }

    image = Toolkit.getDefaultToolkit().createImage(buffer);
    tracker.addImage(image, 1);

    try {
      tracker.waitForAll();
    } catch (InterruptedException e) {
    }

Any ideas?

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Asked On
2003-06-27 at 08:27:02ID20662218
Tags

crc

,

corruption

Topic

Java Programming Language

Participating Experts
3
Points
250
Comments
5

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Answers

 

by: htjPosted on 2003-06-27 at 08:29:09ID: 8814121

One more thing to note is that this only occurs when I attempt to run the applet in a browser.

It seems to work when I let my IntelliJ IDE run it.

 

by: girionisPosted on 2003-06-27 at 08:46:55ID: 8814243

 Does the same happen if you run it from the appletviewer?

 

by: objectsPosted on 2003-06-27 at 13:39:54ID: 8816357

> buffer = new byte[in.available()];

in.available() returns the number of bytes currently available to read(), not necessarily the number of bytes in the image

> in.read(buffer);

This does not necessarily fill the buffer.

I'd suggest simply using the following to load your image:

ImageIcon icon = new ImageIcon(getClass().getResource(s));
Image i = icon.getImage();


   

 

by: omry_yPosted on 2003-06-27 at 13:52:47ID: 8816427

Try in.readFully() instead of read()

 

by: objectsPosted on 2003-06-30 at 02:59:06ID: 8826544

20120131-EE-VQP-002

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