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    <p>The code to which you link does not work. The <code>PunycodeDecode</code> function is broken. Line 416 reads:</p> <pre><code>move(output[i], output[i + 1], (outidx - i) * SizeOf(output^)); </code></pre> <p>This is a mis-translation from C. Instead it should read:</p> <pre><code>move(output[i], output[i + 1], (outidx - i) * SizeOf(output^[0])); </code></pre> <p>After making this change, I successfully tested the following program:</p> <pre><code>program Punycode; {$APPTYPE CONSOLE} uses SysUtils, dorPunyCode in 'dorPunyCode.pas'; function PEncode(const str: UnicodeString): AnsiString; var len: Cardinal; begin if str = '' then begin Result := ''; exit; end; if (PunycodeEncode(Length(str), PPunyCode(str), len) = pcSuccess) and (Length(str) + 1 &lt;&gt; len) then begin SetLength(Result, len); PunycodeEncode(Length(str), PPunyCode(str), len, PByte(Result)); end else Result := str; end; function PDecode(const str: AnsiString): UnicodeString; var outputlen: Cardinal; begin if str = '' then begin Result := ''; exit; end; outputlen := 0; if (PunycodeDecode(Length(str), PByte(str), outputlen) = pcSuccess) and (Length(str) + 1 &lt;&gt; outputlen) then begin SetLength(Result, outputlen); PunycodeDecode(Length(str), PByte(str), outputlen, PPunycode(Result)); end else Result := str; end; procedure Test(const Input: UnicodeString); begin if PDecode(PEncode(Input))&lt;&gt;Input then raise EAssertionFailed.CreateFmt('Round-trip failed: %s', [Input]); end; begin Test('http://президент.рф/'); Test('David Heffernan'); Test(''); Test('A'); end. </code></pre> <p>However, I know exactly nothing about Punycode and in particular I've no idea what the point of the <code>'xn--'</code> prefix that is added at the question to which you linked. So the <code>PEncode</code> and <code>PDecode</code> routines that I show above are probably not exactly what you need.</p> <p>I am extremely dubious of the Delphi code in the <code>dorPunyCode</code> unit and I suspect that there are other problems lurking. In your position I would get hold of <code>punycode.c</code>, compile it with <code>bcc32</code> and then link to it with <code>$L</code>. I would regard that as much more trustworthy than this <code>dorPunyCode</code> unit.</p>
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    1. PODelphi: Punicode Decode
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    1. USDavid Heffernan
    1. USDavid Heffernan
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      1. VTUpMod
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    1. COYou can say more about where i can get punycode.c and how to link "to it with $L"? This is my first time with this encounter.
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      1. USdedoki
    2. COThere's a link at the top of the Delphi unit. Do you know much about punycode?
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      1. USDavid Heffernan
    3. CO[The GNI IDN library](http://www.gnu.org/software/libidn/) has instructions and examples. [This](http://git.savannah.gnu.org/cgit/libidn.git/tree/examples/example.c) shows you how to compile libIDN and [here](http://git.savannah.gnu.org/cgit/libidn.git/tree/examples/example2.c) is an example of how to use punycode.
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