问题
I use the following code to get a base64 encoded string of my image:
UIImage *image = [photoView image];
NSString *encoded = [UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
The image is 800*800 pixels, but the generated string is so big that it crashes my browser when I paste it in a textbox. I pasted it in dreamweaver to count the lines and it is over 300.000 lines. This can't be right. If I upload the same picture to this site it generates a base64 string of about 200 lines.
How do I generate a 'normal' base64 string in objective c? One that I can actually use...
As Martin R suggested I checked the data length of what UIImagePNGRepresentation(image) returns and it is 4502370 bytes. This is probably a part of the problem. Could it be that drawing an image in a UIImageView and retrieving it later like I'm doing gives back an image at the screen size?
回答1:
By using NSDataBase64Encoding64CharacterLineLength you limit each line to 64 characters (as is written in the documentation). Try:
NSString *encoded = [UIImagePNGRepresentation(image) base64EncodedStringWithOptions:0];
回答2:
A base-64 encoded string is 1.37 times the size of the binary data. Therefore:
800x800x4 (32-bit RGBA) = 2,560,000 bytes
x 1.37 = 3,507,200 bytes
I don't understand why you are pasting the base-64 encoded string into a browser though?
来源：https://stackoverflow.com/questions/20971719/how-to-get-valid-base64-string-for-an-image