Images

[Terry Stehle]

Im using getImage from the java.applet library. And I was wondering if theres a way that I can check and see if the images are finished loading before I display them. I have tried using ImageIcon but having problems getting it to work on my web site. I get access denied errors. Anyways I would appricate any help in this matter. Thanks Terry.

[Nathan Pruett]

That's what MediaTracker is for. It is in the java.awt package. Here's a short snippet of code to show how it's used...

// A component reference has to be sent to the MediaTracker's 
// constructor... in most cases you can just use [I]this[/I]
// because you are creating it in an applet.
MediaTracker mt = new MediaTracker( this );
 
Image img = getImage( getCodeBase(), "img.gif" );
 
// You add an image to the MediaTracker with an ID... this is
// useful if you are loading alot of images because you can show
// a status bar of how many images out of the total have loaded, 
// and it's easier to use a thread or something to load the
// images a few at a time...
mt.addImage( img, 0 );
 
try
{
    // This loads the image specified by the ID into memory.
    mt.waitForID( 0 );
    
    // As an alternative there is waitForAll(), which loads
    // all images you've put into the MediaTracker so far, and
    // there is also waitForID( int ID, long MS ) that tries to
    // load the image, but gives up if it takes longer than the 
    // specified number of milliseconds.
}
catch( InterruptedException exception )
{
}

-Nate
[This message has been edited by Nathan Pruett (edited September 26, 2001).]