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Interprocess communication !!!

Posted on 1998-10-21
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Last Modified: 2010-04-02
Would you like help me how to comminicate interprocess ?
My problem is :
In my main program(A) I already actived another process(B) by WinExec() or CreateProcess() function and at this time my program A has to stop for waiting B process ends (exit the system or was killed by Windows). But I don't know when B process ends  is it return a value to my main A program ???
And how my program can capture that value to run at the rest of its ?
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Question by:longlong
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2 Comments
 
LVL 3

Accepted Solution

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stefanr earned 200 total points
ID: 1175734
Try something like this:

STARTUPINFO StartupInfo = { 0 };
StartupInfo.cb = sizeof(STARTUPINFO);

// Initialize StartupInfo with appropriate values.

PROCESS_INFORMATION ProcessInfo = { 0 };

if (::CreateProcess(lpszAppName, lpszCmdLine, NULL, NULL, FALSE, dwCreationFlags, NULL, NULL, &StartupInfo, &ProcessInfo))
{
   switch (::WaitForSingleObject(ProcessInfo.hProcess, dwMilliseconds))
   {
      case WAIT_OBJECT_0:
         // The process is terminated.
         {
            DWORD dwExitCode = 0;
            ::GetExitCodeProcess(ProcessInfo.hProcess, &dwExitCode); // You must have PROCESS_QUERY_INFORMATION access on NT.
         }
         break;

      case WAIT_TIMEOUT:
         // Fall through.
      default:
         // Timeout while waiting for process termination.
         break;
   }

   ::CloseHandle(ProcessInfo.hThread); // Don't forget!
   ::CloseHandle(ProcessInfo.hProcess); // Don't forget!
}

That doesn't work with WinExec, since it don't return any handles.
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Author Comment

by:longlong
ID: 1175735
Thank you very much.
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