RETERR CALLBACK DefNdiProc(hndi, uMsg, wParam, lParam)
HNDI hndi; // NDI handle
UINT uMsg; // message
WPARAM wParam; // first message parameter
LPARAM lParam; // second message parameter
The DefNdiProc is the default NDI procedure that processes messages sent to an NDI object. If an NDI object does not have a custom installer procedure, the default installer procedure will be used. If an NDI object has a custom NDI procedure, it should pass messages to DefNdiProc for default handling.