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    <p>I've found that both <code>stringByAddingPercentEscapesUsingEncoding:</code> and <code>CFURLCreateStringByAddingPercentEscapes()</code> are inadequate. The <code>NSString</code> method misses quite a few characters, and the CF function only lets you say which (specific) characters you want to escape. The proper specification is to escape all characters except a small set.</p> <p>To fix this, I created an <code>NSString</code> category method to properly encode a string. It will percent encoding everything EXCEPT <code>[a-zA-Z0-9.-_~]</code> and will also encode spaces as <code>+</code> (according to <a href="http://tools.ietf.org/html/draft-hammer-oauth-10#section-3.6" rel="noreferrer">this specification</a>). It will also properly handle encoding unicode characters.</p> <pre><code>- (NSString *) URLEncodedString_ch { NSMutableString * output = [NSMutableString string]; const unsigned char * source = (const unsigned char *)[self UTF8String]; int sourceLen = strlen((const char *)source); for (int i = 0; i &lt; sourceLen; ++i) { const unsigned char thisChar = source[i]; if (thisChar == ' '){ [output appendString:@"+"]; } else if (thisChar == '.' || thisChar == '-' || thisChar == '_' || thisChar == '~' || (thisChar &gt;= 'a' &amp;&amp; thisChar &lt;= 'z') || (thisChar &gt;= 'A' &amp;&amp; thisChar &lt;= 'Z') || (thisChar &gt;= '0' &amp;&amp; thisChar &lt;= '9')) { [output appendFormat:@"%c", thisChar]; } else { [output appendFormat:@"%%%02X", thisChar]; } } return output; } </code></pre>
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    1. POObjective-c iPhone percent encode a string?
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    1. USDave DeLong
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    1. CONote that encoding spaces as + instead %20 is according to x-www-form-urlencoded, not to oauth-1,3.6 (the spec link you posted).
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    2. COthis is even converting http:// in to escape characters....
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      1. USmihir mehta
    3. CO@mihir of course. This is just a conversion method. If you don't want an entire string encoded, don't pass in the entire string...
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