CODEWITHSUNDEEP
objective-cnsstring
Patrick
Patrick

Reputation: 21

stringByAddingPercentEscapesUsingEncoding does not escape "&"

I am using stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding to pass data to a php script. The problem is if the field has the char '&' in the text lets say: 'someone & cars', only the text "someone" is saved, everything after the '&' doesn't.

To create the string I use [NSString stringWithFormat:], so I have like 5 field in the form and if I use stringbyReplacingOcorrencesOfstring:@"&", what it does is replace the whole string not only the char '&' from the text field, so I get error.

Any ideas?

Upvotes: 1

Views: 2712

Answers (2)

CodeOverRide
CodeOverRide

Reputation: 4471

Following works using stringByAddingPercentEncodingWithAllowedCharacters if you want to specifically allow what would be encoded yourself. I'm using after base64 so this works fine.

NSString *charactersToEscape = @"!*'();:@&=+$,/?%#[]\" ";
NSCharacterSet *customEncodingSet = [[NSCharacterSet characterSetWithCharactersInString:charactersToEscape] invertedSet];

NSString *url = [NSString stringWithFormat:@"%@", @"http://www.test.com/more/test.html?name=john&age=28"];
NSString *encodedUrl = [url stringByAddingPercentEncodingWithAllowedCharacters:customEncodingSet];

Upvotes: 2

James Frost
James Frost

Reputation: 6990

Unfortunately, stringByAddingPercentEscapesUsingEncoding: doesn't actually escape all necessary URL characters.

Instead, you can use the lower-level CoreFoundation function:

(NSString *)CFURLCreateStringByAddingPercentEscapes(NULL, (CFStringRef)myString, NULL, (CFStringRef)@"!*'\"();:@&=+$,/?%#[]% ", CFStringConvertNSStringEncodingToEncoding(encoding));

or, when using ARC:

CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(NULL, (__bridge CFStringRef)myString, NULL, (__bridge CFStringRef)@"!*'\"();:@&=+$,/?%#[]% ", CFStringConvertNSStringEncodingToEncoding(encoding)));

See this post for an example of a category on NSString that uses this function.

Upvotes: 6

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