Hcnetsdk.dll 9 Hikvision Error (Cross-Platform Full)

[DllImport("hcnetsdk.dll")] private static extern uint NET_DVR_GetLastError();

If you have tried all the solutions in this guide and still face error 9, contact Hikvision technical support with a minimal reproducible code example and the SDK log file—they will pinpoint the exact illegal parameter causing the failure. hcnetsdk.dll 9 hikvision error

NET_DVR_USER_LOGIN_INFO loginInfo = new NET_DVR_USER_LOGIN_INFO(); loginInfo.dwSize = (uint)Marshal.SizeOf(loginInfo); // Prevents error 9 loginInfo.sDeviceAddress = ip; loginInfo.wPort = port; loginInfo.sUserName = user; loginInfo.sPassword = pwd; loginInfo.dwLoginMode = 0; // TCP mode [DllImport("hcnetsdk