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Plotting icons into NSImage

Hello everybody!

I am running into problems when plotting an IconRef into an NSImage. Here is the piece of code I am using:

IconRef ref;
err = GetIconRefFromFileInfo (&fsref, fname.length, fname.unicode,
kIconServicesCatalogInfoMask, &catinfo, kIconServicesNormalUsageFlag, &ref, &label);

if (err == noErr)
{
CGRect myRect = CGRectMake(0,0,128,128);
NSImage* image = [[NSImage alloc] initWithSize:NSMakeSize (128,128)];
[image lockFocus];
PlotIconRefInContext((CGContextRef)[[NSGraphicsContext currentContext]
graphicsPort],&myRect,kAlignNone,kTransformNone,NULL,kPlotIconRefNormalF lags,ref);
[image unlockFocus];
NSData * imageData = [image TIFFRepresentation];

[imageData writeToFile:@"/Users/daniel/Desktop/myicon.tif" atomically:YES];

When I open myicon.tif in Preview, the icon is on top of a black background. I thought it might be the alpha channel, but then Preview should be able to deal with transparency... What is it that goes wrong?

Cheers,
Daniel
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