Is this possible? UIImage > NSData > NSString > .txt file

It's certainly possible, but seems like overkill depending on what you're trying to achieve.

If you just want to cache images then why not just convert the UIImage to NSData and write it to NSUserDefaults?

Code:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData *data = UIImagePNGRepresentation(image);
[defaults setObject:data forKey:@"key"];

Code:

NSData *data = [defaults dataForKey:@"key"];
UIImage *image = [UIImage imageWithData:data];

For export, you could use a JSON library for iPhone like SBJSON, or Base64-encode your images.

For converting NSString and NSData back and forth, you can use:

Code:

NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

Code:

NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];

 

From your NSData, I'd look at converting it using uuencode and decoding with uudecode. The other option is Base 64. This is common with e-mail applications.

 

Hi, do you succeed in exporting image and text to google docs? I'm trying to use base64 encoding without success.
Thanks in advance,
Fran