C#代码如何实现海康相机数字IO输出

以下是C#代码示例，用于实现海康相机数字IO输出：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;

namespace DigitalIOControlDemo
{
    class Program
    {
        [DllImport("HCNetSDK.dll")]
        public static extern bool NET_DVR_Init();

        [DllImport("HCNetSDK.dll")]
        public static extern bool NET_DVR_Cleanup();

        [DllImport("HCNetSDK.dll")]
        public static extern int NET_DVR_Login_V30(string sDVRIP, ushort wDVRPort, string sUserName, string sPassword, ref NET_DVR_DEVICEINFO_V30 lpDeviceInfo);

        [DllImport("HCNetSDK.dll")]
        public static extern bool NET_DVR_Logout(int lUserID);

        [DllImport("HCNetSDK.dll")]
        public static extern bool NET_DVR_SetDVRConfig(int lUserID, uint dwCommand, int lChannel, ref NET_DVR_DIGITAL_IO_CONTROL lpInBuffer, uint dwInBufferSize);

        [StructLayout(LayoutKind.Sequential)]
        public struct NET_DVR_DEVICEINFO_V30
        {
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 48)]
            public string sSerialNumber;
            public byte byAlarmInPortNum;
            public byte byAlarmOutPortNum;
            public byte byDiskNum;
            public byte byDVRType;
            public byte byChanNum;
            public byte byStartChan;
            public byte byAudioChanNum;
            public byte byIPChanNum;
            public byte byZeroChanNum;
            public byte byMainProto;
            public byte bySubProto;
            public byte bySupport;
            public byte bySupport1;
            public byte bySupport2;
            public ushort wDevType;
            public byte bySupport3;
            public byte byMultiStreamProto;
            public byte byStartDChan;
            public byte byStartDTalkChan;
            public byte byHighDChanNum;
            public byte bySupport4;
            public byte byLanguageType;
            public byte byVoiceInChanNum;
            public byte byRes3;
            public byte byMirrorChanNum;
            public ushort wStartMirrorChanNo;
            public byte byRes2;
            public byte bySupport5;
            public int lStartUserRight; // the begin user right
            public int lEndUserRight; // the end user right
            public byte byMirrorChanNum2;
            public byte byStartListenChan;
            public byte byReserve3;
            public byte bySupport6;
            public int lSerialNum; //Serial number
            public byte bySupport7;
            public byte byDevTypeName;
            public byte byRes4;
            public byte bySupport8;
            public byte bySupport9;
            public byte bySupport10;
            public byte bySupport11;
            public byte bySupport12;
            public byte bySupport13;
            public byte bySupport14;
            public byte bySupport15;
            public byte bySupport16;
            public byte bySupport17;
            public byte bySupport18;
            public byte bySupport19;
            public byte bySupport20;
            public byte bySupport21;
            public byte bySupport22;
            public byte bySupport23;
            public byte bySupport24;
            public byte bySupport25;
            public byte bySupport26;
            public byte bySupport27;
            public byte bySupport28;
            public byte bySupport29;
            public byte bySupport30;
            public byte bySupport31;
            public byte bySupport32;
            public byte bySupport33;
            public byte bySupport34;
            public byte bySupport35;
            public byte bySupport36;
            public byte bySupport37;
            public byte bySupport38;
            public byte bySupport39;
            public byte bySupport40;
            public byte bySupport41;
            public byte bySupport42;
            public byte bySupport43;
            public byte bySupport44;
            public byte bySupport45;
            public byte bySupport46;
            public byte bySupport47;
            public byte bySupport48;
            public byte bySupport49;
            public byte bySupport50;
            public byte bySupport51;
            public byte bySupport52;
            public byte bySupport53;
            public byte bySupport54;
            public byte bySupport55;
            public byte bySupport56;
            public byte bySupport57;
            public byte bySupport58;
            public byte bySupport59;
            public byte bySupport60;
            public byte bySupport61;
            public byte bySupport62;
            public byte bySupport63;
            public byte bySupport64;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct NET_DVR_DIGITAL_IO_CONTROL
        {
            public uint dwSize;
            public uint dwChannel;
            public uint dwControlType;
            public NET_DVR_DIGITAL_IO struDigitalIO;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 76, ArraySubType = UnmanagedType.I1)]
            public byte[] byRes;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct NET_DVR_DIGITAL_IO
        {
            public uint dwChannel;
            public uint dwWorkType;
            public uint dwTrigType;
            public byte byDelayTime;
            public byte byRes1;
            public ushort wRes1;
            public uint dwAlarmOutPut;
            public uint dwOutputDuration;
            public byte byMode;
            public byte byPolarity;
            public byte byRes2;
            public byte bySignalLatch;
            public byte byRes3;
            public byte bySignalType;
            public byte byRes4;
            public byte byRes5;
            public byte byRes6;
            public byte byRes7;
            public uint dwSignalInPut;
            public uint dwInputLevel;
            public byte byRes8;
            public byte byRes9;
            public ushort wRes2;
            public uint dwTrigChannel;
            public byte byTrigDelayTime;
            public byte byTrigLatch;
            public byte byTrigSignalType;
            public byte byRes10;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4, ArraySubType = UnmanagedType.I1)]
            public byte[] byRes11;
        }

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

            // 登录相机
            NET_DVR_DEVICEINFO_V30 deviceInfo = new NET_DVR_DEVICEINFO_V30();
            int lUserID = NET_DVR_Login_V30("192.168.1.64", 8000, "admin", "12345", ref deviceInfo);
            if (lUserID < 0)
            {
                Console.WriteLine("登录相机失败，错误码：" + NET_DVR_GetLastError().ToString());
                return;
            }

            // 设置数字 IO 参数
            NET_DVR_DIGITAL_IO_CONTROL struIOControl = new NET_DVR_DIGITAL_IO_CONTROL();
            struIOControl.dwSize = (uint)Marshal.SizeOf(struIOControl);
            struIOControl.dwChannel = 1; // IO 通道号
            struIOControl.dwControlType = 0; // 输出模式

            NET_DVR_SetDVRConfig(lUserID, NET_DVR_SET_IO_CONTROL_CFG, 0, ref struIOControl, (uint)Marshal.SizeOf(struIOControl));

            // 启用输出信号
            struIOControl.struDigitalIO.dwChannel = 1; // IO 通道号
            struIOControl.struDigitalIO.dwWorkType = 1; // 手动模式
            struIOControl.struDigitalIO.byMode = 1; // 输出高电平

            NET_DVR_SetDVRConfig(lUserID, NET_DVR_SET_IO_CONTROL_CFG, 0, ref struIOControl, (uint)Marshal.SizeOf(struIOControl));

            // 关闭输出信号
            struIOControl.struDigitalIO.byMode = 0; // 输出低电平

            NET_DVR_SetDVRConfig(lUserID, NET_DVR_SET_IO_CONTROL_CFG, 0, ref struIOControl, (uint)Marshal.SizeOf(struIOControl));

            // 释放资源
            NET_DVR_Logout(lUserID);
            NET_DVR_Cleanup();
        }
    }
}

注意：以上代码仅供参考，实际使用时需要根据相机型号和需求进行调整。