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I am loading an image into my application from users and do not know in advance

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Question: I am loading an image into my application from users and do not know in advance what are dimensions. How do I find a width and height if it is an image and how to know if it is not? Maybe it is text file or some another kind of no image file.

Answer: The AWT provides two ways for you to track image loading: the MediaTracker class and the ImageObserver interface. The MediaTracker class is a utility class to track the status of a number of media objects. Media objects could include audio clips as well as images, though currently only images are supported.

The MediaTracker class is sufficient for many programs. You just create a MediaTracker instance, tell it to track one or more images, and then ask the MediaTracker the status of those images, as needed.

The ImageObserver interface lets you keep even closer track of image loading. Two methods: getWidth and the getWidth method of the Image class take one argument ImageObserver and return dimensions or -1 if it is not an image.


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