如何获得UIImage正确的文件大小

Question

When I take the picture on camera, I'd like to get file size of UIImage.

-(void)imagePickerController:(UIImagePickerController*)imagePicker didFinishPickingMediaWithInfo:(NSDictionary*)info {
     UIImage *originalimage = [info objectForKey:UIImagePickerControllerOriginalImage];
     NSData *dataForPNGFile =  UIImagePNGRepresentation(originalimage);
     int fileLengthPNG = dataForPNGFile.length;
     NSLog(@"-->> fileSizePNG : [%i]", fileLengthPNG);
}

I wrote this code but the system console returned "fileSizePNG : [10550292]".
I think 10550292 bytes is too big.

It is about 10MB so I thought my code is mistake.

If you find any problems, could you please let to me?

Answer 1

I'd [dataForPNGFile writeToFile:@"test.png" atomically:YES]

and then go to the actual file and look at the size of the file. Then you'll know for sure.