Question

I have some problem for decoding image data from base 64 encoded string.
I am using base64.h and base 64.m files downloaded from the following link

http://cdn.imthi.com/e6cef8/wp-content/uploads/2010/08/base64.zip

This is my code

[Base64 initialize];
NSData * data = [Base64 decode:imageString];
imgview.image=[UIImage imageWithData:data];

but, nothing displayed in the image view ,

I tested by decoding the base 64 string(taken from debugger console) with an online base 64 decoder,It gives correct image,
I also tested by writing the data to a file like this

[data writeToFile:imagePath atomically:YES];

it gives a jpg file but i can’t open that image file,
it gives error message like

The file “test.jpg” could not be opened.

“It may be damaged or use a file format that Preview doesn’t recognize.”
What is the problem with my code
Can anyone help me…..

Thank you

Answer 1

Try a different base 64 implementation, I use the one from colloquy open source project:

    #import "NSDataAdditions.h" 

    /* encoded string to image */
    NSString *imageString = @"";
    NSData * data = [NSData dataWithBase64EncodedString:imageString];
    UIImage *image1 = [UIImage imageWithData:data];

    /* image to encoded string, back to image */
    imageString = [UIImagePNGRepresentation(image) base64Encoding];
    data = [NSData dataWithBase64EncodedString:imageString];
    UIImage *image2 = [UIImage imageWithData:data];

Get NSAdditions files: NSAdditions.h + NSAdditions.m