Hello,

I have a thread function on Process B that contains a switch to perform certain operations based on the results of an event sent from Process A, these are stored as two elements in an array.

I set the first element to the event which signals when Process A has data to send and I have the second element set to the event which indicates when Process A has closed.

I have began to implement the functionality for the switch statement but I'm not getting the results as I expect.

Consider the following:

//
    //Thread function
    DWORD WINAPI ThreadFunc(LPVOID passedHandle)
    {

        for(i = 0; i < 2; i++)
        {
            ghEvents[i] = OpenEvent(EVENT_ALL_ACCESS, FALSE, TEXT("Global\\ProducerEvents"));


            if(ghEvents[i] == NULL)
            {
                getlasterror = GetLastError();
            }
        }

        dwProducerEventResult = WaitForMultipleObjects(
            2,
            ghEvents,
            FALSE,
            INFINITE);

        switch (dwProducerEventResult) 
    {
    case WAIT_OBJECT_0 + 0: 
        {
            //Producer sent data

            //unpackedHandle = *((HWND*)passedHandle);

            MessageBox(NULL,L"Test",L"Test",MB_OK);

            break;
        }
    case WAIT_OBJECT_0 + 1:
        {
            //Producer closed
            ExitProcess(1);
            break;
        }
    default: 
        return;
    }
}

As you can see if the event in the first array is signalled Process B should display a simple message box, if the second array is signalled the application should close.

When I actually close Process A, Process B displays the message box instead.

If I leave the first case blank (Do nothing) both applications close as they should.

Furthermore Process B sends data an error is thrown (When I comment out the unpacking):

Have I implemented my switch statement incorrectly? I though I handled the unpacking of the HWND correctly too, any suggestions?

Thanks for your time.