String to PAnsiChar

function StringToPAnsiChar(stringVar : string) : PAnsiChar;
Var
  AnsString : AnsiString;
  InternalError : Boolean;
begin
  InternalError := false;
  Result := '';
  try
    if stringVar <> '' Then
    begin
       AnsString := AnsiString(StringVar);
       Result := PAnsiChar(PAnsiString(AnsString));
    end;
  Except
    InternalError := true;
  end;
  if InternalError or (String(Result) <> stringVar) then
  begin
    Raise Exception.Create('Conversion from string to PAnsiChar failed!');
  end;
end;


procedure TForm1.Button1Click(Sender: TObject);
var
  str : PAnsiChar;
begin
  str := StringToPAnsiChar('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789$-_.+!*''(),{}|\^~[]`<>#%|<>;/?:@ß=');
  Label1.Caption := str;
end;