NET_DVR_GetDVRConfig 获取设备配置信息的两种方式

方式一:

[DllImportAttribute("HCNetSDK.dll", EntryPoint = "NET_DVR_GetDVRConfig", CallingConvention = CallingConvention.StdCall)]
[return: MarshalAsAttribute(UnmanagedType.Bool)]
public static extern bool NET_DVR_GetDVRConfig(int lUserID, uint dwCommand, int lChannel,IntPtr lpOutBuffer, uint dwOutBufferSize, ref uint lpBytesReturned);

uint dwReturned=0; //初始化实际接收的数据长度指针
IntPtr lptr;
HikClient.HCNetSDK.NET_DVR_USER_V30 PICCFG = new HikClient.HCNetSDK.NET_DVR_USER_V30();
int size = Marshal.SizeOf(PICCFG);//返回对象的大小
lptr = Marshal.AllocHGlobal(size);//根据大小分配内存
if (NET_DVR_GetDVRConfig(lUserID, 1006, 通道编号, lptr, (uint)size, ref dwReturned)) ;
{
PICCFG = (HikClient.HCNetSDK.NET_DVR_USER_V30)Marshal.PtrToStructure(lptr, typeof(HikClient.HCNetSDK.NET_DVR_USER_V30));
}
Marshal.FreeHGlobal(lptr);
MessageBox.Show(PICCFG.dwSize.ToString());