Question

OK this is what I want :

• Take some NSImages
• Add them to an ICNS file
• Save it

This is what I’ve done so far (purely as a test) :

- (CGImageRef)refFromImage:(NSImage*)img
{
    CGImageSourceRef source;

    source = CGImageSourceCreateWithData((CFDataRef)[img TIFFRepresentation], NULL);
    CGImageRef maskRef =  CGImageSourceCreateImageAtIndex(source, 0, NULL);

    return maskRef;
}

- (void)awakeFromNib
{
    NSImage* img1 = [NSImage imageNamed:@"image1"];
    NSImage* img2 = [NSImage imageNamed:@"image2"];

    NSLog(@"%@",img1);
    CGImageRef i1 = [self refFromImage:img1];
    CGImageRef i2 = [self refFromImage:img2];

    NSURL *fileURL = [NSURL fileURLWithPath:[@"~/Documents/final.icns" stringByExpandingTildeInPath]]; 
    CGImageDestinationRef dr = CGImageDestinationCreateWithURL((__bridge CFURLRef)fileURL, kUTTypeAppleICNS , 1, NULL);

    CGImageDestinationAddImage(dr, i1, NULL);
    CGImageDestinationAddImage(dr, i2, NULL);
    /* Even tried adding 'multiple' times

    CGImageDestinationAddImage(dr, i1, NULL);
    CGImageDestinationAddImage(dr, i2, NULL);
    CGImageDestinationAddImage(dr, i1, NULL);
    CGImageDestinationAddImage(dr, i2, NULL);

    */

    CGImageDestinationFinalize(dr);

    CFRelease(dr);
}

But, it still keeps throwing an error :

ImageIO: CGImageDestinationFinalize image destination does
not have enough images

What’s wrong with my code?

---

I’ve had a look at the answers below, but still nothing :

• Save CGImageRef to PNG file errors? (ARC Caused?)
• How exactly to make a CGImageRef from an image on disk

Answer 1

You can use IconFamily.

IconFamily is a Cocoa/Objective-C wrapper for the Mac OS X Carbon
API’s “icon family” data type. Its main purpose is to enable Cocoa
applications to easily create custom file icons from NSImage
instances, and thus take advantage of Mac OS X’s high-resolution RGBA
“thumbnail” icon formats to provide richly detailed thumbnail previews
of the files’ contents.

NSImage *mImage = [[NSImage alloc] initWithContentsOfFile:@"/Users/Username/Desktop/WhiteTiger.jpg"];
IconFamily *fam = [IconFamily iconFamilyWithThumbnailsOfImage:mImage];    
[fam writeToFile:@"/Users/Username/Desktop/WhiteTiger.icns"];