Reputation: 331
I have a CGImageRef that I want to convert to NSData without saving it into some file. Right now, I am doing this by saving the image to some temporary location and then retrieving this to a NSData. How can I do this without saving the image?
CGImageRef img = [[self system_Application] getScreenShot];
NSString *tempDirectory = NSTemporaryDirectory();
CFURLRef url = (CFURLRef)[NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/abc.jpg",tempDirectory]];
CGImageDestinationRef destination = CGImageDestinationCreateWithURL(url, kUTTypePNG, 1, NULL);
CGImageDestinationAddImage(destination, img, nil);
if(!CGImageDestinationFinalize(destination))
NSLog(@"Failed to write Image");
NSData *mydata = [NSData dataWithContentsOfFile:[NSString stringWithFormat:@"%@/abc.jpg",tempDirectory]];
Upvotes: 4
Views: 5458
Reputation: 11039
iOS:
NSData *data = UIImageJPEGRepresentation([[UIImage alloc] initWithCGImage:img], 1)
MacOS:
NSImage *image = [[NSImage alloc] initWithCGImage:img size:NSSizeFromCGSize(CGSizeMake(100, 100))];
NSBitmapImageRep *imgRep = (NSBitmapImageRep *)[[image representations] objectAtIndex: 0];
NSData *data = [imgRep representationUsingType: NSPNGFileType properties: @{}];
Upvotes: 7
Reputation: 331
I was able to do this in the following manner:
CFMutableDataRef newImageData = CFDataCreateMutable(NULL, 0);
CGImageDestinationRef destination = CGImageDestinationCreateWithData(newImageData, kUTTypePNG, 1, NULL);
CGImageDestinationAddImage(destination, img, nil);
if(!CGImageDestinationFinalize(destination))
NSLog(@"Failed to write Image");
NSData *newImage = ( NSData *)newImageData;
Upvotes: 9