Finding filepath of an UIImage in Objective-C

Question

In my app you pick an image using UIImagePickerControllerDelegate, so I have an UIImage. Now I need the filepath of said image.

More about the app: I'm trying to modify/edit a selected PNG image. I need to be able to access each pixel of chosen image. I have found source code on how to access the pixels but the code relies on loading the image via filepath and I haven't found any way of using the UIImage instead. I've tried:

CGImageRef si = [imageView.image CGImage];
CGDataProviderRef src = CGImageGetDataProvider(si);
CGImageRef img = CGImageCreateWithPNGDataProvider(src, NULL, NO, kCGRenderingIntentDefault);

But that only gives me the error: ": CGDataProviderGetSize: size is too large for this function."

(See iPhone SDK: accessing indexed color PNG images )

progrmr · Accepted Answer · 2011-09-10 14:12:53Z

1

When the image is picked, your delegate gets a callback on imagePickerController:didFinishPickingMediaWithInfo: That call includes an info parameter which is a dictionary. One of the keys gives you the file URL. A file URL can be converted to a path using the path method.

answered Sep 10, 2011 at 14:12

progrmr

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OZZIE Over a year ago

I saw in the documentation that that method signature was deprecated but using the correct signature - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info only gives me the keys and values "key: UIImagePickerControllerMediaType, value: public.image key: UIImagePickerControllerOriginalImage, value: <UIImage: 0x392e680>"

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