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GetGraphicsImporterForDataRef

I'm trying to get a graphics importer component for some in-memory data. Unfortunately, the QuickTime documentation on this subject is less than informative and somewhat circular :)

Can anyone spot what's wrong with this, or link me up with some more useful documentation / sample code that does what I want?

data = [NSData dataWithContentsOfURL:url];
dataref = NewHandle(sizeof(const void*));
HLock(dataref);
*(const void**)*dataref = [data bytes];
HUnlock(dataref);

err = GetGraphicsImporterForDataRef(dataref, PointerDataHandlerSubType, &gi);
if (err != noErr)
{
NSLog(@"Can't get graphics import component for data");
goto CLEAN_UP_SELF;
}

Thanks,
Keith
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