Stephen,
Killing the parent process will not necessarily terminate all its child
processes. Even if your parent is able to somehow detect external
termination, it won't be able to kill all its children. The best you could
do is terminate the immediate children, if you actually created the child
processes, by using the process handles. However, what happens if your
children create more child processes? You have no way of knowing that, so
you won't be able to kill them either. Basically, there is no parent-child
relationship between processes in Windows like traditional Unix
environments.
You have to rely on unmanaged Win32 process/threads APIs for this. You
have to spawn child processes using "CreateProcess" or
"CreateProcessAsUser", and then add your parent process to a Windows
JobObject. The JobObject will, from that point onward, keep track of all
your child processes. When you decide to cleanup your processes, you can
call "TerminateJobObject", which will cleanup your process tree. Mind you
that JobObject is available only in Windows 2000, XP and Windows 2003. If
you search for JobObject on MSDN, you should find an article about how to
use them in MSDN magazine. I use P/Invoke to call the Win32 APIs from C#
code. You could do it with Managed C++ or COM.
HTH,
Srihari
On Fri, 6 Aug 2004, Stephen Hess wrote:
> Hi all,
>
> I'm trying to use System::Diagnostics::Process to spin off processes
> (mostly doing builds using devenv.com), watch/store the output, and provide
> a method for killing that process if desired.
>
> It appears that when I call Process.Kill - it will kill the direct process
> that I spawned, but any child process stays running. The docs make it
> sound like it should kill everything, but that's not what I'm seeing.
>
> Launching the process:
>
> ...
> mRunningProcess->StartInfo->set_FileName( execStr );
> mRunningProcess->StartInfo->set_Arguments( argsStr );
> mRunningProcess->StartInfo->set_UseShellExecute( false );
> mRunningProcess->StartInfo->set_CreateNoWindow( true );
> mRunningProcess->StartInfo->set_RedirectStandardOutput( true );
> mRunningProcess->StartInfo->set_RedirectStandardError( true );
> mRunningProcess->Start();
> ...
>
> With execStr set to:
> "C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\IDE\devenv.com"
>
> And argsStr set to:
> "BuildMe.sln" /rebuild Release
>
> Then killing the process via a button click from the GUI:
>
> if ( ( mRunningProcess != 0x0 ) && !mProcessBreak )
> {
> mProcessBreak = true;
>
> if ( !mRunningProcess->CloseMainWindow() )
> {
> mRunningProcess->Kill();
> }
>
> Thread::Sleep( 1 );
> }
>
> Any help very much appreciated.
>
> Thanks,
> Stephen Hess
>
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