c#海康visionmaster二次开发每隔5秒监控相机是否在线

您好！要每隔5秒钟监控相机是否在线，您可以使用C#中的定时器Timer，代码如下：

using System;
using System.Timers;
using System.Runtime.InteropServices;
using HCNetSDK;

class Program
{
    static int loginHandle = -1;

    static void Main(string[] args)
    {
        // 初始化 SDK
        HCNetSDK.NET_DVR_Init();

        // 每隔5秒钟检查相机是否在线
        Timer timer = new Timer();
        timer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
        timer.Interval = 5000;
        timer.Enabled = true;

        // 等待用户输入任意字符退出程序
        Console.ReadLine();

        // 关闭定时器、登出相机并释放资源
        timer.Enabled = false;
        if (loginHandle >= 0)
        {
            HCNetSDK.NET_DVR_Logout(loginHandle);
        }
        HCNetSDK.NET_DVR_Cleanup();
    }

    static void OnTimedEvent(object source, ElapsedEventArgs e)
    {
        Console.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));

        // 如果相机未登录，则登录相机
        if (loginHandle < 0)
        {
            NET_DVR_USER_LOGIN_INFO loginInfo = new NET_DVR_USER_LOGIN_INFO();
            loginInfo.sDeviceAddress = "192.168.1.100";
            loginInfo.wPort = 8000;
            loginInfo.sUserName = "admin";
            loginInfo.sPassword = "12345";
            loginInfo.bUseAsynLogin = false;
            NET_DVR_DEVICEINFO_V40 deviceInfo = new NET_DVR_DEVICEINFO_V40();
            loginHandle = HCNetSDK.NET_DVR_Login_V40(ref loginInfo, ref deviceInfo);
            if (loginHandle < 0)
            {
                Console.WriteLine("登录相机失败：{0}", HCNetSDK.NET_DVR_GetLastError());
                return;
            }
        }

        // 获取相机状态
        NET_DVR_WORK_STATUS workStatus = new NET_DVR_WORK_STATUS();
        int bufferSize = Marshal.SizeOf(workStatus);
        IntPtr bufferPtr = Marshal.AllocHGlobal(bufferSize);
        Marshal.StructureToPtr(workStatus, bufferPtr, true);
        int bytesReturned = 0;
        bool success = HCNetSDK.NET_DVR_GetDVRConfig(loginHandle, HCNetSDK.NET_DVR_GET_WORK_STATUS, -1, bufferPtr, bufferSize, out bytesReturned);
        workStatus = (NET_DVR_WORK_STATUS)Marshal.PtrToStructure(bufferPtr, typeof(NET_DVR_WORK_STATUS));

        // 判断相机是否在线
        if (workStatus.dwDeviceStatic == 1)
        {
            Console.WriteLine("相机在线");
        }
        else
        {
            Console.WriteLine("相机离线");

            // 登出相机、清除登录句柄
            HCNetSDK.NET_DVR_Logout(loginHandle);
            loginHandle = -1;
        }
    }
}

注意，以上代码仅为示例，仅供参考。具体实现还需根据您的具体需求进行调整。