Re: WaitForSingleObject does not wait

From:

"Alexander Grigoriev" <alegr@earthlink.net>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 16 Sep 2009 19:31:07 -0700

Message-ID:

<uk8Gr7zNKHA.1232@TK2MSFTNGP05.phx.gbl>

If the target process gets elevated, an intermediate (proxy) process is
started first to request elevation, and you only get a handle to that
intermediate process. It end very promptly, thus the handle is signalled. If
you print ProcessID from processinfo, and compare it with the actual
elevated process ID, they will be different.

"Kilo" <kilo@yahoo.com.hk> wrote in message
news:%23RxCHxsNKHA.1232@TK2MSFTNGP05.phx.gbl...

Here is my code. It pops up a message box with text "Wait object". But I
can still see the dialog box of that process.

DWORD createProcess(CString applicationPath, CString parameter) {
   STARTUPINFO startupInfo;
   ZeroMemory(&startupInfo, sizeof(startupInfo));
   startupInfo.cb = sizeof(startupInfo);

   PROCESS_INFORMATION processInfo;
   ZeroMemory(&processInfo, sizeof(processInfo));

   DWORD returnCode = 0;

   parameter = applicationPath + _T(' ') + parameter;

   if (!CreateProcess(
       NULL,
       parameter.LockBuffer(),
       NULL,
       NULL,
       FALSE,
       0,
       NULL,
       NULL,
       &startupInfo,
       &processInfo)) {
       returnCode = GetLastError();
   }

   parameter.UnlockBuffer();

   switch (WaitForSingleObject(processInfo.hProcess, INFINITE)) {
       case WAIT_ABANDONED:
           AfxMessageBox(_T("Wait abandoned"));
       break;
       case WAIT_TIMEOUT:
           AfxMessageBox(_T("Wait timeout"));
       break;
       case WAIT_OBJECT_0:
           AfxMessageBox(_T("Wait object"));
       break;
       case WAIT_FAILED:
           AfxMessageBox(_T("Wait failed"));
       break;
   }

   CloseHandle(processInfo.hThread);
   CloseHandle(processInfo.hProcess);

   // zero if success
   // non-zero if fail
   return returnCode;
}

"Goran" <goran.pusic@gmail.com> ???
news:2c3cf2af-f739-4b5e-80c7-99176c19ed17@f10g2000vbf.googlegroups.com
???...
On Sep 16, 12:56 pm, "Kilo" <k...@yahoo.com.hk> wrote:

I have called CreateProcess to create a process. Then I called
WaitForSingleObject with INFINITE timeout. However, it does not wait.

It does. Chances are that your code is wrong.