I'm having a little confusion due to conflicting return values from CreateProcess()
and GetLastError()
. When I use CreateProcess()
in a manner similar to below, it succeeds and appears to accomplish its required tasks. Yet, GetLastError()
still returns Access is Denied.
If access is denied, why is does it appear to complete the task. In contrast, if CreateProcess()
succeeds, why is GetLastError()
returning access denied?
Or is my use of GetLastError()
incorrect? Am I only supposed to use it when CreateProcess()
returns a failed value? (My justification for the below behavior was that I figured it was better to be safe than sorry)
SetLastError(0);
hello = CreateProcess(_T("C:\\Windows\\System32\\cmd.exe"),
_T("C:\\Windows\\System32\\cmd.exe /C ant debug"),
NULL,NULL,false,0,NULL,
_T("C:\\My\\Directory"),&siStartupInfo, &piProcessInfo);
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |FORMAT_MESSAGE_ALLOCATE_BUFFER
|FORMAT_MESSAGE_IGNORE_INSERTS,NULL,GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)&errorText, 0, NULL);
AfxMessageBox(errorText);
Is this type of behavior normal? In the CreateProcess()
documentation, it mentions using GetLastError()
when CreateProcess()
fails, but it does not mention the inverse. Not criticizing the documentation, would just like some clarification.
This occurs whether the second parameter in CreateProcess()
is NULL
or not. Maybe it has to do with cmd.exe
permissions? If that's the case, shouldn't CreateProcess()
fail? Thank you.