How to get the process ID's of all running programs

Problem/Question/Abstract:

I am trying to build a component to get info about the programs executing in my NT4 environment. I managed to get the names for all the windows running (title text). Now, how can I get the process ID for each of them? Which function should I use? Is there any function that tells me for how long my process is running?

Answer:

It is better to use the EnumWindows function instead of FindWindow/GetWindow, because the latter isn't sensitive to windows being destroyed halfway through the loop and you can end up getting invalid handles. Here's an example:

function EnumWindowsProc(hWnd: LongWord; Form: TForm1): WordBool; stdcall;
begin
  Form.FoundAWindow(hWnd);
  Result := True
end;

procedure TForm1.FoundAWindow(hWnd: LongWord);
var
  ProcessID: LongWord;
  Title: array[0..255] of Char;
begin
  GetWindowThreadProcessID(hWnd, @ProcessID);
  GetWindowText(hWnd, Title, 256);
  {Now, do whatever you want with Title and ProcessID, e.g.:}
  Memo1.Lines.Add(Title + ' [' + IntToStr(ProcessID) + ']')
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  EnumWindows(@EnumWindowsProc, Integer(Self))
end;