Using CreateProcess to launch event viewer, how to wait the end of the viewer?

Question

I'm currently writing an application that must start the event viewer (system32/eventvwr.msc) and be blocked as long as the event viewer runs.

For standard applications I'm doing this by:

    BOOL logDone =  CreateProcess(NULL
                              , applicationCmdLine
                              , NULL
                              , NULL
                              , false
                              , NORMAL_PRIORITY_CLASS
                              , NULL
                              , NULL
                              , &si
                              , &pi
                            );
if (logDone)
{
    WaitForSingleObject(pi.hProcess, INFINITE);
}

But this code does not work with the event viewer. The wait immediately returns.

Do you now how to wait for the end of this application?

Thanks for your help.