Is there a way to HTML encode a string (NSString) in objective-c, something along the lines of Server.HtmlEncode in .NET?
Thanks!
+4
A:
There isn't an NSString method that does that. You'll have to write your own function that does string replacements. It is sufficient to do the following replacements:
- '&' => "&"
- '"' => """
- '\'' => "'"
- '>' => ">"
- '<' => "<"
Something like this should do (haven't tried):
[[[[[myStr stringByReplacingOccurrencesOfString: @"&" withString: @"&"] stringByReplacingOccurrencesOfString: @"\"" withString: @"""] stringByReplacingOccurrencesOfString: @"'" withString: @"'"] stringByReplacingOccurrencesOfString: @">" withString: @">"] stringByReplacingOccurrencesOfString: @"<" withString: @"<"];
thesamet
2009-04-29 19:06:51
I was hoping to avoid this, but thanks for the info about them not having something built in.
Billy
2009-04-29 19:26:15
This solution doesn't work in all cases. I recently ran into a bug with the UTF-8 string that included the character 0xE28099 which translates to UTF-8 2019 or the 'right single quotation mark'. Such extended characters are not handled in the above example, and caused errors in our client's server (as they were out of spec). The above example work work in most cases, but not all.
Aftermathew
2009-06-24 16:17:15
Although it does occur to me now that our client's XML Schema specifically called out ISO-8859-1, and I'm not sure if this would be a problem otherwise.
Aftermathew
2009-06-24 16:34:48
Just a quick note, if you're going perform a lot of these escapes on a lot of XML/HTML inside 1 run loop then don't forget to wrap each encode in an `NSAutoreleasePool`!
Michael Waterfall
2009-11-02 17:26:48
+3
A:
For URL encoding:
NSString * encodedString = [originalString
stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
See Apple's NSString documentation for more info.
For HTML encoding:
Check out CFXMLCreateStringByEscapingEntities, which is part of the Core Foundation XML library, but should still do the trick.
e.James
2009-04-29 19:10:36
+11
A:
I use Google Toolbox for Mac (works on iPhone). In particular, see the additions to NSString in GTMNSString+HTML.h and GTMNSString+XML.h.
Chris Lundie
2009-04-29 19:34:24
+3
A:
the samets's routine forgot the hex digit. Here's the routine I came up with that works:
- (NSString*)convertEntities:(NSString*)string
{
NSString *returnStr = nil;
if( string )
{
returnStr = [ string stringByReplacingOccurrencesOfString:@"&" withString: @"&" ];
returnStr = [ returnStr stringByReplacingOccurrencesOfString:@""" withString:@"\"" ];
returnStr = [ returnStr stringByReplacingOccurrencesOfString:@"'" withString:@"'" ];
returnStr = [ returnStr stringByReplacingOccurrencesOfString:@"9" withString:@"'" ];
returnStr = [ returnStr stringByReplacingOccurrencesOfString:@"’" withString:@"'" ];
returnStr = [ returnStr stringByReplacingOccurrencesOfString:@"–" withString:@"'" ];
returnStr = [ returnStr stringByReplacingOccurrencesOfString:@">" withString:@">" ];
returnStr = [ returnStr stringByReplacingOccurrencesOfString:@"<" withString:@"<" ];
returnStr = [ [ NSString alloc ] initWithString:returnStr ];
}
return returnStr;
}
Mike
2009-12-19 15:46:04
+2
A:
I took Mike's work and turn it into a category for NSMutableString and NSString
Make a Category for NSMutableString with:
- (NSMutableString *)xmlSimpleUnescape
{
[self replaceOccurrencesOfString:@"&" withString:@"&" options:NSLiteralSearch range:NSMakeRange(0, [self length])];
[self replaceOccurrencesOfString:@""" withString:@"\"" options:NSLiteralSearch range:NSMakeRange(0, [self length])];
[self replaceOccurrencesOfString:@"'" withString:@"'" options:NSLiteralSearch range:NSMakeRange(0, [self length])];
[self replaceOccurrencesOfString:@"9" withString:@"'" options:NSLiteralSearch range:NSMakeRange(0, [self length])];
[self replaceOccurrencesOfString:@"’" withString:@"'" options:NSLiteralSearch range:NSMakeRange(0, [self length])];
[self replaceOccurrencesOfString:@"–" withString:@"'" options:NSLiteralSearch range:NSMakeRange(0, [self length])];
[self replaceOccurrencesOfString:@">" withString:@">" options:NSLiteralSearch range:NSMakeRange(0, [self length])];
[self replaceOccurrencesOfString:@"<" withString:@"<" options:NSLiteralSearch range:NSMakeRange(0, [self length])];
return self;
}
- (NSMutableString *)xmlSimpleEscape
{
[self replaceOccurrencesOfString:@"&" withString:@"&" options:NSLiteralSearch range:NSMakeRange(0, [self length])];
[self replaceOccurrencesOfString:@"\"" withString:@""" options:NSLiteralSearch range:NSMakeRange(0, [self length])];
[self replaceOccurrencesOfString:@"'" withString:@"'" options:NSLiteralSearch range:NSMakeRange(0, [self length])];
[self replaceOccurrencesOfString:@">" withString:@">" options:NSLiteralSearch range:NSMakeRange(0, [self length])];
[self replaceOccurrencesOfString:@"<" withString:@"<" options:NSLiteralSearch range:NSMakeRange(0, [self length])];
return self;
}
Make a Category for NSString with:
- (NSString *)xmlSimpleUnescapeString
{
NSMutableString *unescapeStr = [NSMutableString stringWithString:self];
return [unescapeStr xmlSimpleUnescape];
}
- (NSString *)xmlSimpleEscapeString
{
NSMutableString *escapeStr = [NSMutableString stringWithString:self];
return [escapeStr xmlSimpleEscape];
}
Tod Cunningham
2010-05-27 01:49:39