Arno,

> The only workaround that comes to my mind was another overload that takes 
> a RawByteString instead of string. I won't use AnsiString because implicit 
> ansi string
>  casts must be avoided too.

That would work for me. I'm not very familiar with the use of RawByteString, 
but I made version of the function that works for me, do you think this version 
would work for others too (I just testet in 2010 C++ builder):

Regards Bjørnar

Code follows (only change from previous version I sent is type-change of first 
in-param):

function UrlDecode(const S : RawByteString ; SrcCodePage: Cardinal = CP_ACP;
  DetectUtf8: Boolean = TRUE) : UnicodeString ;
var
    I, J, L : Integer;
    U8Str   : AnsiString;
    Ch      : AnsiChar;
begin
    L := Length(S);
    SetLength(U8Str, L);
    I := 1;
    J := 0;
    while (I <= L) and (S[I] <> '&') do begin
        Ch := AnsiChar(S[I]);
        if Ch = '%' then begin
            Ch := AnsiChar(htoi2(PAnsiChar(@S[I + 1])));
            Inc(I, 2);
        end
        else if Ch = '+' then
            Ch := ' ';
        Inc(J);
        U8Str[J] := Ch;
        Inc(I);
    end;
    SetLength(U8Str, J);
    if (SrcCodePage = CP_UTF8) or (DetectUtf8 and IsUtf8Valid(U8Str)) then
{$IFDEF COMPILER12_UP}
        Result := Utf8ToStringW(U8Str)
    else
        Result := AnsiToUnicode(U8Str, SrcCodePage);
{$ELSE}
        Result := Utf8ToStringA(U8Str)
    else
        Result := U8Str;
{$ENDIF}
end;
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