C#中如何连接海康威视

下面我将详细讲解如何在C#中连接海康威视。

1.准备工作

在开始之前，我们需要做一些准备工作。

1. 安装海康威视设备的SDK，可以从海康威视官网下载对应版本的SDK。

2. 将SDK的bin目录下的HCNetSDK.dll文件拷贝到C#项目的bin目录下。

2.连接海康威视

接下来，我们将通过以下步骤连接海康威视。

1. 引入HCNetSDK.dll

在代码中添加以下代码：

using System.Runtime.InteropServices;
[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, int wDVRPort, string sUserName, string sPassword, ref NET_DVR_DEVICEINFO_V30 lpDeviceInfo);
[DllImport("HCNetSDK.dll")]
public static extern bool NET_DVR_Logout(int iUserID);

1. 初始化SDK

在代码中添加以下代码：

if (NET_DVR_Init()) 
{
   Console.WriteLine("初始化SDK成功！");
}
else 
{
   Console.WriteLine("初始化SDK失败！错误码：" + NET_DVR_GetLastError());
   return;
}

其中，NET_DVR_GetLastError()函数可以获取当前SDK的错误码。

1. 登录设备

在代码中添加以下代码：

NET_DVR_DEVICEINFO_V30 deviceInfo = new NET_DVR_DEVICEINFO_V30();
int userID = NET_DVR_Login_V30("设备IP地址", 端口号, "用户名", "密码", ref deviceInfo);
if (userID < 0) 
{
   Console.WriteLine("登录设备失败！错误码：" + NET_DVR_GetLastError());
   NET_DVR_Cleanup();
   return;
}
else 
{
   Console.WriteLine("登录设备成功！");
}

其中，NET_DVR_Login_V30()函数返回的是userID，如果返回值小于0，则表示登录失败。

1. 登出设备

在代码中添加以下代码：

bool logout = NET_DVR_Logout(userID);
if (!logout) 
{
   Console.WriteLine("登出设备失败！错误码：" + NET_DVR_GetLastError());
}
else 
{
   Console.WriteLine("登出设备成功！");
}

3.示例

下面是两个示例。第一个示例连接设备并获取设备参数。第二个示例连接设备并打开实时预览。

示例1：获取设备参数

using System;
using System.IO;
using System.Text;
using System.Runtime.InteropServices;
using System.Threading;

namespace Hikvision
{    
    [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 bySupport;
        public byte byRes1;
        public ushort wDevType;
        public byte byRes2;
    }

    public class HikvisionTest
    {
        [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, int wDVRPort, string sUserName, string sPassword, ref NET_DVR_DEVICEINFO_V30 lpDeviceInfo);

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

        [DllImport("HCNetSDK.dll")]
        public static extern int NET_DVR_GetLastError();

        static void Main(string[] args)
        {
            if (NET_DVR_Init()) 
            {
                Console.WriteLine("初始化SDK成功！");
            }
            else 
            {
                Console.WriteLine("初始化SDK失败！错误码：" + NET_DVR_GetLastError());
                return;
            }

            NET_DVR_DEVICEINFO_V30 deviceInfo = new NET_DVR_DEVICEINFO_V30();
            int userID = NET_DVR_Login_V30("设备IP地址", 端口号, "用户名", "密码", ref deviceInfo);
            if (userID < 0) 
            {
                Console.WriteLine("登录设备失败！错误码：" + NET_DVR_GetLastError());
                NET_DVR_Cleanup();
                return;
            }
            else 
            {
                Console.WriteLine("登录设备成功！");
            }

            Console.WriteLine("设备序列号：" + deviceInfo.sSerialNumber);
            Console.WriteLine("通道数：" + deviceInfo.byChanNum);

            bool logout = NET_DVR_Logout(userID);
            if (!logout) 
            {
                Console.WriteLine("登出设备失败！错误码：" + NET_DVR_GetLastError());
            }
            else 
            {
                Console.WriteLine("登出设备成功！");
            }

            NET_DVR_Cleanup();
        }
    }
}

示例2：打开实时预览

using System;
using System.IO;
using System.Text;
using System.Runtime.InteropServices;
using System.Threading;

namespace Hikvision
{    
    [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 bySupport;
        public byte byRes1;
        public ushort wDevType;
        public byte byRes2;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct NET_DVR_PREVIEWINFO
    {
        public int lChannel;
        public int dwStreamType;
        public int dwLinkMode;
        public IntPtr hPlayWnd;
        public int bBlocked;
        public int bPassbackRecord;
        public int bPreviewMode;
        public int bRetrieveIPChannel;
        public int dwDisplayBufNum;
        public IntPtr byRes;
    }

    public class HikvisionTest
    {
        [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, int wDVRPort, string sUserName, string sPassword, ref NET_DVR_DEVICEINFO_V30 lpDeviceInfo);

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

        [DllImport("HCNetSDK.dll")]
        public static extern int NET_DVR_GetLastError();

        [DllImport("HCNetSDK.dll")]
        public static extern int NET_DVR_RealPlay_V40(int iUserID, ref NET_DVR_PREVIEWINFO lpPreviewInfo, RealDataCallBack_V30 fRealDataCallBack_V30, IntPtr pUser);

        public delegate void RealDataCallBack_V30(int lRealHandle, ref NET_DVR_PACKET_INFO_EX pstruPacketInfo, IntPtr pUser);

        static void Main(string[] args)
        {
            if (NET_DVR_Init()) 
            {
                Console.WriteLine("初始化SDK成功！");
            }
            else 
            {
                Console.WriteLine("初始化SDK失败！错误码：" + NET_DVR_GetLastError());
                return;
            }

            NET_DVR_DEVICEINFO_V30 deviceInfo = new NET_DVR_DEVICEINFO_V30();
            int userID = NET_DVR_Login_V30("设备IP地址", 端口号, "用户名", "密码", ref deviceInfo);
            if (userID < 0) 
            {
                Console.WriteLine("登录设备失败！错误码：" + NET_DVR_GetLastError());
                NET_DVR_Cleanup();
                return;
            }
            else 
            {
                Console.WriteLine("登录设备成功！");
            }

            NET_DVR_PREVIEWINFO lpPreviewInfo = new NET_DVR_PREVIEWINFO();
            lpPreviewInfo.hPlayWnd = IntPtr.Zero;
            lpPreviewInfo.lChannel = 1;
            lpPreviewInfo.dwStreamType = 0;
            lpPreviewInfo.dwLinkMode = 0;
            lpPreviewInfo.bBlocked = true;
            lpPreviewInfo.dwDisplayBufNum = 15;

            int playHandle = NET_DVR_RealPlay_V40(userID, ref lpPreviewInfo, null, IntPtr.Zero);
            if (playHandle < 0) 
            {
                Console.WriteLine("打开实时预览失败！错误码：" + NET_DVR_GetLastError());
            }
            else 
            {
                Console.WriteLine("打开实时预览成功！");
            }

            Thread.Sleep(5000);//5秒钟后关闭实时预览

            bool stopPreview = NET_DVR_StopRealPlay(playHandle);
            if (!stopPreview) 
            {
                Console.WriteLine("关闭实时预览失败！错误码：" + NET_DVR_GetLastError());
            }
            else 
            {
                Console.WriteLine("关闭实时预览成功！");
            }

            bool logout = NET_DVR_Logout(userID);
            if (!logout) 
            {
                Console.WriteLine("登出设备失败！错误码：" + NET_DVR_GetLastError());
            }
            else 
            {
                Console.WriteLine("登出设备成功！");
            }

            NET_DVR_Cleanup();
        }
    }
}

以上就是连接海康威视的完整攻略，希望能对你有所帮助。