Control LOGO display.
BOOL NET_DVR_LogoSwitch( LONG lUserID, DWORD dwDecChan, DWORD dwLogoSwitch )
[IN] User ID, which is returned by NET_DVR_Login_V40.
[IN] Decoding channel No.
[IN] Switch on/off command. 1-NET_DVR_SHOWLOGO, display LOGO; 2-NET_DVR_HIDELOGO, hide LOGO.
Return TRUE for success and FALSE for failure. If FALSE is returned, you can call NET_DVR_GetLastError to get the error code.