如何将.cpbitmap转换为可读图像（png，jpg，jpeg…）

Question

I like to convert an .cpbitmap file to an image format that can be displayed in UIImageView. Is there a way to do this in Objective-C? The app will run on jailbroken Devices, so thats not a big deal.

Answer 1

Import private AppSupport.framework and declare this

CFArrayRef CPBitmapCreateImagesFromData(CFDataRef cpbitmap, void*, int, void*);

This function will return an array of CGImageRef objects. First argument is data from .cpbitmap file. Other arguments are unknown to me (one of them is probably CFAllocatorRef ) so I checked how iOS calls this function and used the same values. Here is how I did it

CPBitmapCreateImagesFromData([NSData dataWithContentsOfFile:@"LockBackground.cpbitmap"], NULL, 1, NULL);

Answer 2

I also wanted to convert HomeBackground.cpbitmap / LockBackground.cpbitmap from Library/Springboard.

The following worked for me: @creker: Thank you!

CFArrayRef CPBitmapCreateImagesFromData(CFDataRef cpbitmap, void*, int, void*);
CFArrayRef someArrayRef = CPBitmapCreateImagesFromData((__bridge CFDataRef)([NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"LockBackground" ofType:@"cpbitmap"]]), NULL, 1, NULL);
NSArray *array = (__bridge NSArray*)someArrayRef;
UIImage *test = [UIImage imageWithCGImage:(__bridge CGImageRef)(array[0])];

I added a breakpoint after the last line and extracted the image with XCode -> test -> Preview.