Using OpenProcess

[capricious_001]

Hi guys, I am trying to use openprocess however I am running into a few problems. Specifically for the last parameter of the function OpenProcess, I am wondering how would I retreive the process id using hwnd retrieved from FindWindow? I have tried GetProcessId however that doesnt seem to work. I get a compiler error saying that its an undeclared identifier. However I have included windows.h so there should not be any problems. Would anyone know how to get the process id of a window handle? Thanks, Robbie

[ovidiucucu]

First note that GetProcessId requires at least Windows XP or Windows Server 2003. Call GetWindowThreadProcessId and OpenProcess:

   DWORD dwProcessID = 0;
   ::GetWindowThreadProcessId(hWnd, &dwProcessID);
   HANDLE hProcess = ::OpenProcess(PROCESS_QUERY_INFORMATION,
                                   FALSE,
                                   dwProcessID);
   if(NULL != hProcess)
   {
      // enjoy of hProcess;
      // ...
      ::CloseHandle(hProcess);
   }
   else
   {
      // ... oups, error!
      DWORD dwError = ::GetLastError();
      // ...
   }

Ovidiu Cucu Microsoft MVP - Visual C++

[capricious_001]

lol I just saw and used that from the MSDN and it worked. Thanks for confirming thats the right one to use!

[ovidiucucu]

You are welcome! BTW. Is MSDN really so funny to "lol", or just my answer ? ;) Ovidiu Cucu Microsoft MVP - Visual C++

[capricious_001]

I've skewed the meaning of "lol" so much that I end up including it in almost every post even if I have a straight face, but if I had to literally have a chuckle at your answer then it would have to be corniest joke I would have ever laughed at ;)