...formatierte Fehlermeldungen ausgeben?

{1.}

function GetLastErrorText(): string;
var
  dwSize: DWORD;
  lpszTemp: PAnsiChar;
begin
  dwSize := 512;
  lpszTemp := nil;
  try
    GetMem(lpszTemp, dwSize);
    FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM or FORMAT_MESSAGE_ARGUMENT_ARRAY,
      nil,
      GetLastError(),
      LANG_NEUTRAL,
      lpszTemp,
      dwSize,
      nil)
  finally
    Result := lpszTemp;
    FreeMem(lpszTemp)
  end
end;

{***********************************}

{2.}

function SystemErrorMessage: string;
var
  P: PChar;
begin
  if FormatMessage(Format_Message_Allocate_Buffer + Format_Message_From_System,
                   nil,
                   GetLastError,
                   0,
                   @P,
                   0,
                   nil) <> 0 then
  begin
    Result := P;
    LocalFree(Integer(P))
  end
  else
    Result := '';
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage(SystemErrorMessage);
end;

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