#include <MsgBoxConstants.au3>
#include <WinAPISysWin.au3>
Example()
Func  Example()
; Run Notepad
Run ("notepad.exe")
; Wait 10 seconds for the Notepad window to appear.
WinWait ("[CLASS:Notepad]","",10)
; Retrieve the handle of the Notepad window using the classname of Notepad.
Local $hWnd= WinGetHandle ("[CLASS:Notepad]")
If @error Then
MsgBox ($MB_SYSTEMMODAL,"","An error occurred when trying to retrieve the window handle of Notepad.")
Exit
EndIf
; Retrieve the identifier of the thread and pass a variable to the $iPID parameter to store the PID.
Local $iPID= 0
Local $iThread= _WinAPI_GetWindowThreadProcessId ($hWnd,$iPID)
; Display the process thread and PID of the Notepad window.
MsgBox ($MB_SYSTEMMODAL,'',"Process thread: "&$iThread&@CRLF &_
"Process ID (PID): "&$iPID)
; Close the Notepad window using the handle returned by WinGetHandle.
WinClose ($hWnd)
EndFunc ;==>Example