function to check what parameters the device actually supports before trying to "Set" them. [3] Update SDK and Firmware : Ensure you are using the latest version of the Hikvision SDK and that your camera firmware is up to date. [4] Validate Channel Numbers

NET_DVR_GetLastError();

: The SDK needs to be initialized before use. Failure to initialize properly can lead to errors. Make sure you've called the initialization function ( HCNetSDK_Init ) successfully before using other SDK functions.