c# 通过海康ISAPI 获取人脸数据

要通过海康ISAPI获取人脸数据，需要先进行以下步骤：

1. 确认你已经有了海康设备，并且设备的IP地址、端口号、用户名和密码都正确无误；
2. 通过ISAPI协议访问设备，获取登录sessionID；
3. 通过设备的人脸识别接口，获取人脸数据。

下面是一个C#示例代码，可以帮助你实现上述步骤：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.IO;
using System.Web.Script.Serialization;

namespace HikvisionISAPI
{
    class Program
    {
        static void Main(string[] args)
        {
            //设备信息
            string ip = "192.168.1.10";
            int port = 80;
            string username = "admin";
            string password = "12345";

            //登录
            string sessionID = Login(ip, port, username, password);

            //获取人脸数据
            string faceData = GetFaceData(ip, port, sessionID);

            Console.WriteLine(faceData);

            //注销登录
            Logout(ip, port, sessionID);

            Console.ReadLine();
        }

        //登录
        static string Login(string ip, int port, string username, string password)
        {
            string url = string.Format("http://{0}:{1}/ISAPI/Security/userCheck", ip, port);

            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);

            request.Method = "POST";
            request.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(Encoding.Default.GetBytes(username + ":" + password)));

            string postData = "{\"userName\":\"" + username + "\",\"password\":\"" + password + "\"}";

            byte[] data = Encoding.UTF8.GetBytes(postData);

            request.ContentType = "application/json";
            request.ContentLength = data.Length;

            Stream stream = request.GetRequestStream();
            stream.Write(data, 0, data.Length);

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            string result = string.Empty;

            using (StreamReader reader = new StreamReader(response.GetResponseStream()))
            {
                result = reader.ReadToEnd();
            }

            JavaScriptSerializer serializer = new JavaScriptSerializer();
            Dictionary<string, object> dict = (Dictionary<string, object>)serializer.DeserializeObject(result);

            string sessionID = dict["sessionID"].ToString();

            return sessionID;
        }

        //获取人脸数据
        static string GetFaceData(string ip, int port, string sessionID)
        {
            string url = string.Format("http://{0}:{1}/ISAPI/Intelligent/FDLib/FDSearch", ip, port);

            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);

            request.Method = "POST";
            request.Headers.Add("Authorization", "Session " + sessionID);

            string postData = "{\"searchResultPosition\":0,\"maxResults\":10,\"FDIDList\":[\"1\"],\"faceMatchThreshold\":0.9}";

            byte[] data = Encoding.UTF8.GetBytes(postData);

            request.ContentType = "application/json";
            request.ContentLength = data.Length;

            Stream stream = request.GetRequestStream();
            stream.Write(data, 0, data.Length);

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            string result = string.Empty;

            using (StreamReader reader = new StreamReader(response.GetResponseStream()))
            {
                result = reader.ReadToEnd();
            }

            return result;
        }

        //注销登录
        static void Logout(string ip, int port, string sessionID)
        {
            string url = string.Format("http://{0}:{1}/ISAPI/Security/userLogout", ip, port);

            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);

            request.Method = "POST";
            request.Headers.Add("Authorization", "Session " + sessionID);

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        }
    }
}

这个示例代码中，我们使用了C#的HttpWebRequest类来发送HTTP请求，获取海康设备的人脸数据。其中，Login方法用于登录设备，GetFaceData方法用于获取人脸数据，Logout方法用于注销登录。你可以根据自己的需求，修改这个示例代码来实现你自己的功能。