function ConvertAnsiToOem(const S: string): string;
{ ConvertAnsiToOem translates a string into the OEM-defined character set }
{$IFNDEF WIN32}
var
  Source, Dest : array[0..255] of Char;
{$ENDIF}
begin
  {$IFDEF WIN32}
  SetLength(Result, Length(S));
  if Length(Result) > 0 then
    AnsiToOem(PChar(S), PChar(Result));
  {$ELSE}
  if Length(Result) > 0 then
  begin
    AnsiToOem(StrPCopy(Source, S), Dest);
    Result := StrPas(Dest);
  end;
  {$ENDIF}
end; { ConvertAnsiToOem }

function ConvertOemToAnsi(const S: string): string;
{ ConvertOemToAnsi translates a string from the OEM-defined
character set into either an ANSI or a wide-character string }
{$IFNDEF WIN32}
var
  Source, Dest : array[0..255] of Char;
{$ENDIF}
begin
  {$IFDEF WIN32}
  SetLength(Result, Length(S));
  if Length(Result) > 0 then
    OemToAnsi(PChar(S), PChar(Result));
  {$ELSE}
  if Length(Result) > 0 then
  begin
    OemToAnsi(StrPCopy(Source, S), Dest);
    Result := StrPas(Dest);
  end;
  {$ENDIF}
end; { ConvertOemToAnsi }