Convert NSString to a form passable in a HTTP POST request

Question

Is there a simple way to escape a NSString so I can use it in a HTTP POST request?

I've tried stringByAddingPercentEscapesUsingEncoding, but the following:

[@"~!@#$%^&*()-+\"'" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]

gives me:

~!@%23$%25%5E&*()-+%22'

which is not usable in a HTTP POST query because the & is left unescaped; therefore the other end interprets whatever follows it as another argument.

Look up the URLEncoding category for NSString. It looks like it is under MIT License and you can find it by searching "NSString+URLEncoding.m" — Jesse Black
– Jesse Black, Commented Jan 21, 2012 at 3:18
@Maudicus: thanks, that worked, I'm posting it as an answer for Googlers. — houbysoft
– houbysoft, Commented Jan 21, 2012 at 5:27
See also stackoverflow.com/questions/718429/…, stackoverflow.com/questions/1748981/nsurl-encoding-in-objc, stackoverflow.com/questions/2159341/… — Isaac
– Isaac, Commented Jan 21, 2012 at 5:32

houbysoft · Accepted Answer · 2012-01-21 05:27:07Z

The following function, part of NSString+URLEncoding.m, does exactly what I need:

- (NSString *)encodedURLParameterString { NSString *result = (NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)self, NULL, CFSTR(":/=,!$&'()*+;[]@#?"), kCFStringEncodingUTF8); return [result autorelease]; }

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