Get Process ID from MainWindowHandle

Posted on 2009-05-08
Last Modified: 2013-11-08
I am attempting to kill a process by using the processID.  I can seem to do this by the process name, but I need to be able to do this by the actual processID since I will have multiples running with the same name I can not kill.  For some reason they are all returning a processID = 0, even when I set the window to visible.  If I debug and look at all the processes collected in the getprocesses() method and take a look at the processes that have open windows (i.e. notepad) they have zero as mainwindowhandle.
private Int32 GetCurrentExcelProcessID()
            Process[] aProcesses = Process.GetProcesses();
            Int32 processID = 0;
            bool originalVisibility = commXl.Visible;
            commXl.Visible = true;
            for (int i = 0; i <= aProcesses.GetUpperBound(0); i++)
                if (aProcesses[i].MainWindowHandle.ToString() == commXl.Hwnd.ToString())
                    processID = aProcesses[i].Id;
            commXl.Visible = originalVisibility;
            return processID;
        private void KillCurrentExcelProcess()
            Process[] aProcesses = Process.GetProcesses();
            Process aProcess = null;
            for (int i = 0; i <= aProcesses.GetUpperBound(0); i++)
                if (aProcesses[i].Id.ToString() == currProcID.ToString())
                    aProcess = aProcesses[i];
                if (aProcess != null)
            catch { }

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Question by:dtadin
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LVL 19

Expert Comment

ID: 24345663

This is a known problem
Try to use WIN32 API GetMainProcessWindow(<processId>) instead of aProcesses[i].MainWindowHandle

Accepted Solution

TMarkham1 earned 250 total points
ID: 24704397

I looked through the Windows API Reference on MSDN, and I don't see a function named GetMainProcessWindow in the entire API (unless I am looking in the wrong place).

I've seen this "GetMainProcessWindow" functionality offered up as a solution a few times in web searches I've done, but none of them went beyond a basic suggestion of "Try the WIN32 API GetMainProcessWindow instead of MainWindowHandle".

Have you personally implemented your suggestion in the past using the .Net Framework? If so, how about a code example?

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