Image from PNG is not fully downloaded and part of Image is black
Hi,
I have quite slow Internet connection (sth like 3kB/s). In my application I create ImageIcon (and then Image from it) from an URL.
Sometimes when I download quite big PNG images (sth like 400 kB) the download process made by internal JVM methods breaks up. All my methods finish properly, but suddenly I get an error:
java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at sun.awt.image.PNGFilterInputStream.read(PNGImageDecoder.java:830)
at java.util.zip.InflaterInputStream.fill(InflaterInputStream.java:213)
at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:134)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:183)
at java.io.BufferedInputStream.read(BufferedInputStream.java:201)
at sun.awt.image.PNGImageDecoder.produceImage(PNGImageDecoder.java:355)
at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:254)
at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:172)
at sun.awt.image.ImageFetcher.run(ImageFetcher.java:136)
and part of the image downloaded is totally black.
Is there a way I can somehow catch this exception or change the code:
Image img = (new ImageIcon(url)).getImage();
so I'm sure that the whole image is downloaded?
jacek
Hiya Jacek,
Try using java.awt.MediaTracker to download the image. The javadocs give an example how to use it to ensure the app waits for the image to be fully downloaded.
Cheers,
James
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