Convert NSString with NSScanner

Question

I have a string formatted like this : Oy\U00e9\U00e9 Oy\U00e9 So, I found something in some forum and tried to adapt it. This is what I use :

// To keep whiteSpaces safe
string = [string stringByReplacingOccurrencesOfString:@" " withString:@"@@**@@"];
NSMutableString* clean_string = [NSMutableString string];
NSScanner* scanner = [NSScanner scannerWithString:string];
NSString* buf = nil;

while (![scanner isAtEnd] ) {
    //Plus de caractères à scanner
    if (![scanner scanUpToString: @"\\u" intoString: &buf] ){
        break;
    }
    NSLog(@"%@", buf);
    [clean_string appendString: buf];

    //Fin du scan
    if ([scanner isAtEnd] ){
        break;
    }

    [scanner setScanLocation: [scanner scanLocation] + 3];//skip the '\\u'
    unsigned c = 0;

    if ([scanner scanHexInt: &c]){
        [clean_string appendFormat: @"%c", c];
    }else{
        [clean_string appendString: @"\\u"];//nm
    }
}



self.cleanStringWithSpaces= [clean_string stringByReplacingOccurrencesOfString:@"@@**@@" withString:@" "];

return self.cleanStringWithSpaces;

The problem is that when I have a string with 2 \u00e9 following, the string is cut.

Example:

Oy\U00e9\U00e9 Oy\U00e9    Give ====> Oyé

Instead of : Oyéé Oyé

Maybe I missed something ... Hope you could help me !

Have a nice day !

http://stackoverflow.com/questions/594797/how-to-use-nsscanner — iPatel, Apr 03 '14 at 14:54
Are you *certain* your string contains `\Uxxxx` and that's not just how you are seeing it in logs/etc.? — trojanfoe, Apr 03 '14 at 14:55
Yes I get this like this. I'm sure, but do you know a method to know it without logs ? — Ritooon, Apr 03 '14 at 15:00
Why does your code scan for lowercase "u" when your input string has uppercase "U"? — Martin R, Apr 03 '14 at 17:11
This does not address the code you're trying to use, but the original problem: you might find either [Converting escaped UTF-8 characters back to their original form](http://stackoverflow.com/q/7860867) or [Removing Unicode and backslash escapes from NSString converted from NSData](http://stackoverflow.com/q/9018347) useful. — jscs, Apr 03 '14 at 18:14
@JoshCaswell Thank you very much ! The first link made it ! A lot of thanks to you ! You could post it in an answer, I'll validate it ;) — Ritooon, Apr 04 '14 at 08:14

score 1 · Accepted Answer · edited May 23 '17 at 12:05

1

@JoshCaswell made my day by answer to my question.

I used something I found here : Converting escaped UTF8 characters back to their original form

[NSString stringWithCString:[name2escaped cStringUsingEncoding:NSUTF8StringEncoding]
        encoding:NSNonLossyASCIIStringEncoding];

edited May 23 '17 at 12:05

Community

1
1

answered Apr 08 '14 at 07:27

Ritooon

155
12

score 0 · Answer 2 · answered Apr 03 '14 at 15:23

I think the problem is with the line:

[scanner setScanLocation: [scanner scanLocation] + 3];//skip the '\\u'

When changing the scanners location, you are counting the escape character. @"\\u" is actually only \u, therefore you should use:

[scanner setScanLocation: [scanner scanLocation] + 2];//skip the '\\u'

Convert NSString with NSScanner

2 Answers2