CODEWITHSUNDEEP
objective-c
Muhammad Umar
Muhammad Umar

Reputation: 11782

Retrieving data from UTF8String encoding in iPhone

I am using following code to save a text in serverDb. It can contain any character from spaces to colons.

queryString = [queryString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

Lets say i sent string "I Can't come" . In server it will be stored as I can\'t come.

While retrieving how can i remove such backslashes and other characters.

Upvotes: 0

Views: 188

Answers (3)

jszumski
jszumski

Reputation: 7416

If you want to handle all input, I would suggest url encoding and decoding anything you send in a query string:

+ (NSString*)urlEncode:(NSString*)rawString {
    NSMutableString *escaped = [[rawString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding] mutableCopy];   
    [escaped replaceOccurrencesOfString:@"$" withString:@"%24" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"&" withString:@"%26" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"+" withString:@"%2B" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"," withString:@"%2C" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"/" withString:@"%2F" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@":" withString:@"%3A" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@";" withString:@"%3B" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"=" withString:@"%3D" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"?" withString:@"%3F" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"@" withString:@"%40" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@" " withString:@"%20" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"\t" withString:@"%09" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"#" withString:@"%23" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"<" withString:@"%3C" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@">" withString:@"%3E" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"\"" withString:@"%22" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"\n" withString:@"%0A" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];

    return escaped;
}

+ (NSString *)urlDecode:(NSString *)rawString {
    NSMutableString *escaped =  [rawString mutableCopy];
    [escaped replaceOccurrencesOfString:@"%24" withString:@"$" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%26" withString:@"&" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%2B" withString:@"+" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%2C" withString:@"," options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%2F" withString:@"/" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%3A" withString:@":" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%3B" withString:@";" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%3D" withString:@"=" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%3F" withString:@"?" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%20" withString:@" " options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%40" withString:@"@" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%09" withString:@"\t" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%23" withString:@"#" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%3C" withString:@"<" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%3E" withString:@">" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%22" withString:@"\"" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
    [escaped replaceOccurrencesOfString:@"%0A" withString:@"\n" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];

    return escaped;
}

Upvotes: 1

βhargavḯ
βhargavḯ

Reputation: 9836

// While storing       
NSString *queryString =@"I can't come";
queryString = [queryString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"%@",queryString);

// While retrieving
queryString = [queryString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"%@",queryString);

Upvotes: 2

Moray
Moray

Reputation: 321

It's quite simple, you have just to use the - (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target withString:(NSString *)replacement method. Here is your little piece of code:

NSString *str = your server string with backslashes
NSString *stringWithoutBackSlashes = [str stringByReplacingOccurrencesOfString:@"\" withString:@""];

Upvotes: 0

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