How to convert (OS_dispatch_data *) 5018112 bytes into NSData to put into UIImage

Question

I've been looking for an answer to this and some seem like they might be what I need but I'm not sure. I found this Question #9152851 and this Question #2617625 and poked around on a bunch of links but I need some direction here.

Essentially, I'm dispatching an async call to process an image using OpenCV. You can see by the code here that I'm turning it into NSData * before sending it back to my delegate.

NSData *proccessedData = [NSData dataWithBytes:processedImage.data length:(processedImage.rows * processedImage.cols)];        
[self.delegate onProcessedBitmapReady:proccessedData withFocusQuality:focusQuality];

But when I get back to my delegate, my processedBitmap is of type (OS_dispatch_data *) and contains a value of bytes. So, when I try to set the UIImage, it gets set to null.

- (void)onProcessedBitmapReady:(NSData *)processedBitmap withFocusQuality:(double)focusQuality
{
    //Use comverted image from self.captureCommand onComplete
    UIImage *image = [[UIImage alloc] initWithData:processedBitmap];
    [self saveImage:image];
}

Here is a screen capture of the values:

So, how do I convert those bytes (or whatever they are) into something that I can stuff into a UIImage?

Thank you in advance for your help.

------------------------------------------------------- Adding a new image -----------------------------------------

Does this new image help?

Thank you.

Answer 1

NSData is actually a class cluster which just provides the interface, and there are multiple special implementations for it around. It appears that OS_dispatch_data is such a special implementations made to pass data objects around blocks, especially since your UIImage creation doesn't crash (as it would if you would pass it a non NSData object, or just garbage memory). Instead, it looks like UIImage simply doesn't recognize the format the image is in!

By the way, Apple has a great guide about the concept of class clusters, which can be found here.