NET_DVR_USER_LOGIN_INFO loginInfo = 0; loginInfo.dwSize = sizeof(NET_DVR_USER_LOGIN_INFO); strcpy(loginInfo.sDeviceAddress, "192.168.1.100"); loginInfo.wPort = 8000; strcpy(loginInfo.sUserName, "admin"); strcpy(loginInfo.sPassword, "12345");

int main() // SDK Initialization NET_SDK InitStatus = NET_Init(); if (InitStatus != NET_OK) // Handle initialization error printf("SDK Init failed!\n"); return -1;

If you are a developer, ensure the HCNetSDK.dll and its dependent folders (like HCNetSDKCom ) are in the same directory as your .exe . The error often stems from the application finding the main DLL but not its sub-components.

Using the wrong version can cause malformed string parameters → error 9.