How do I decode html coded characters in an NSString?

Question

I am writing an app with both english and french support. The app requests information from a server and the server response uses JSON. I am using the JSONKit library to parse the response but the strings its parsing from the french responses look like this:

Membres –Économisez 5% sur les services et jusqu’à 15% sur d’autres produits

How do I decode the special characters? so that I get this:

Membres –Économisez 5% sur les services et jusqu’à 15% sur d’autres produits

I looked at the API for NSString and tried some of the instance methods but I don't know much about character encodings and I ended up getting some weird results. So if you can also provide a brief explanation on character encodings I'd really appreciate it.

Thanks in advance

Possible duplicate of: stackoverflow.com/questions/1105169/… — mja
– mja, Commented Sep 22, 2011 at 14:51
Possible duplicate of stackoverflow.com/questions/7513312/response-encryption-problem/… — zaph
– zaph, Commented Sep 22, 2011 at 15:31

StackRunner · Accepted Answer · 2017-11-27 17:33:57Z

5

This solution worked well for me if you're still using Objective C code.

- (NSString *)decodeHtmlStringValue
{
  NSData *encodedString = [self dataUsingEncoding:NSUTF8StringEncoding];
  NSAttributedString *htmlString = [[NSAttributedString alloc] initWithData:encodedString
                                                                    options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: [NSNumber numberWithInt:NSUTF8StringEncoding]} documentAttributes:nil error:nil];
  return [htmlString string];
}

If your using swift

https://stackoverflow.com/questions/25607247/how-do-i-decode-html-entities-in-swift

answered Nov 27, 2017 at 17:33

StackRunner

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Alastair Stuart · Accepted Answer · 2011-09-22 15:19:09Z

3

Check out these NSString categories

answered Sep 22, 2011 at 15:19

Alastair Stuart

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2 Comments

luis.ramireznossa Over a year ago

How would I go about using this? Probably a dumb question but I'm still fairly new to iPhone programming

Alastair Stuart Over a year ago

Add that file and its matching h header file to your project. NSString will then have a new instance method called stringByDecodingHTMLEntities. NSString *decodedString = [encodedString stringByDecodingHTMLEntities];

cellcortex · Accepted Answer · 2011-09-22 15:20:08Z

1

NSString stringByReplacingPercentEscapesUsingEncoding with the correct string encoding should do the magic.

[yourString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

might be a good candidate.

answered Sep 22, 2011 at 15:20

cellcortex

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3 Comments

luis.ramireznossa Over a year ago

I tried: NSString *myString = [myOtherString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; but its returning null. I checked myOtherString and it contains the encoded string.

Martin Winter Over a year ago

The documentation states: Returns nil if the transformation is not possible, for example, the percent escapes give a byte sequence not legal in encoding.

miracle-doh Over a year ago

This is for percent decoding, the question is asking for html code decoding

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