What does <Error>: ImageIO: PNG [5C][30][0D]I: invalid chunk type mean?

Question

i saved an image pulled from image picker into a mysql database, i retrieve the image and try to create a uiimage from it with

[self.currentPicView setImage:[[UIImage alloc] initWithData:[[Person person] current_pic]]];

and it gives me the error:

<Error>: ImageIO: PNG [5C][30][0D]I: invalid chunk type
<Error>: ImageIO: PNG [5C][30][0D]I: invalid chunk type

without crashing.. the image just doesn't show. i have no idea what that error means or how to fix it. any ideas?

ps:

[[Person person] current_pic]

contains the PNG image data.. Person is a singleton. current_pic is an NSData property in Person. i can't include that code because the property is synthesized and so i didn't create the method myself or override it.

To prep and upload(via POST using EPUpload from here ) the image, i do:

-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
  UIImage *image= [info objectForKey:@"UIImagePickerControllerOriginalImage"];
  NSData *webData = UIImagePNGRepresentation(image);
  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
  NSString *documentsDirectory = [paths objectAtIndex:0];
  NSString *localFilePath = [documentsDirectory stringByAppendingPathComponent:@"temp-file"];
  [webData writeToFile:localFilePath atomically:YES];
  NSLog(@"localFilePath.%@",localFilePath);
  [self doUpload:localFilePath];
  [[picker parentViewController] dismissViewControllerAnimated:YES completion:^{}];
}

UPDATE: When i construct a UIImage in the didFinishPickingMedia method using 'webData', it doesn't give an error and the image is create sans error.

i tried uploading that same webData directly to the server with POST, then retrieved it and attempted to create another image from it, and got the error again

Answer 1

I got this issue when I had two png images in my bundle with the same name! orange.png and orange.png ... renamed the second to citrus.png , I hadn't even realized they had the same name for at least an hour, and whenever I would try to load that image, the app would crash with this error.

Answer 2

通过将其作为Base64String与服务器之间来回发送，可以避免这些错误