Question

Regarding:

PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)

If hWnd is NULL, PeekMessage retrieves
messages for any window that belongs
to the current thread, and any
messages on the current thread’s
message queue whose hwnd value is NULL
(see the MSG structure). Therefore if
hWnd is NULL, both window messages and
thread messages are processed.

Are messages received via a named pipe included in window messages and thread messages?

Answer 1

Definitely not. Named pipes do not send window messages.

The thread messages in this context are special and have nothing to do with named pipes.

Use MsgWaitForMultipleObjects instead.

CODE SAMPLE:

void MessageLoop(HANDLE hNamedPipe)
{
    do {
        DWORD res = MsgWaitForMultipleObjects(1, &hNamedPipe, INFINITE, QS_ALLEVENTS, MWMO_INPUTAVAILABLE);
        if (res == WAIT_OBJECT_0) {
           /* Handle named pipe -- at this point ReadFile will not block */
        } else if (res == WAIT_OBJECT_0 + 1) {
           MSG msg;
           if (!GetMessage(&msg, NULL, 0, 0))
              break; /* WM_QUIT */
           TranslateMessage(&msg);
           DispatchMessage(&msg);
        }
    } while (1);
}