Question

如何从UIImage获取NSData

Answer 1

从UIImage 取出CGImageRef, 然后画到一个新的CGImageRef, 然后就可以的到原始数据//UIImage* ImageA;CGImageRef image = [ImageA CGImage]; CGSize image_size = ImageA.size; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();void* data = malloc(image_size.width * image_size.height * 4);CGContextRef context =CGBitmapContextCreate(data, image_size.width, image_size.height, 8, 4 * image_size.width, colorSpace,kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);CGContextDrawImage(context, CGRectMake(0, 0, leftwidth, image_size.height), image);/*data中就是你要得原始bmp图了, 没有文件头*/CGContextRelease(context);free(data);