Set the auto-switch status of a decoding channel.
BOOL NET_DVR_MatrixSetLoopDecChanEnable( LONG lUserID, DWORD dwDecChanNum, DWORD dwEnable );
[IN] Value returned by NET_DVR_Login_V40.
[IN] Decoding channel No. or window No.
[OUT] 0-Disable, 1-Enable.
Return TRUE for success, and return FALSE for failure.
If FALSE is returned, you can call NET_DVR_GetLastError to get the error code.