人脸识别 API C# 示例代码

阿里的人脸识别 API，有多种语言的示例代码，但没有 c# 的。

https://help.aliyun.com/document_detail/67818.html?spm=a2c4g.11186623.6.556.rD16LC

于是今天有了：

[csharp]view plain copy
using System;  
using System.Collections.Generic;  
using System.IO;  
using System.Linq;  
using System.Net;  
using System.Reflection;  
using System.Security.Cryptography;  
using System.Text;  
  
namespace AliFace  
{  
    class Program  
    {  
        /// <summary>  
        /// 计算MD5+BASE64  
        /// </summary>  
        /// <param name="s"></param>  
        /// <returns></returns>  
        public static String MD5Base64(String s)  
        {  
            if (s == null)  
                return null;  
  
            MD5 md5 = new MD5CryptoServiceProvider();  
            byte[] result = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(s));  
  
            return Convert.ToBase64String(result);  
        }  
          
        /// <summary>  
        /// 计算 HMAC-SHA1  
        /// </summary>  
        /// <param name="data"></param>  
        /// <param name="key"></param>  
        /// <returns></returns>  
        public static String HMACSha1(String data, String key)  
        {  
            String result;  
            try  
            {  
                HMACSHA1 hmac = new HMACSHA1()  
                {  
                    Key = Encoding.Default.GetBytes(key)  
                };  
  
                byte[] rawHmac = hmac.ComputeHash(Encoding.Default.GetBytes(data));  
                result = Convert.ToBase64String(rawHmac);  
            }  
            catch (Exception e)  
            {  
                throw new Exception("Failed to generate HMAC : " + e.Message);  
            }  
            return result;  
        }  
          
        /// <summary>  
        /// GMT 时间格式  
        /// </summary>  
        /// <param name="date"></param>  
        /// <returns></returns>  
        public static String toGMTString(DateTime date)  
        {  
            return date.ToString("r");  
        }  
  
        /// <summary>  
        /// 阿里人像比对接口地址  
        /// </summary>  
        public static string VerifyURL = "https://dtplus-cn-shanghai.data.aliyuncs.com/face/verify";  
  
        /// <summary>  
        /// 发送 Post 请求  
        /// </summary>  
        /// <param name="body"></param>  
        /// <param name="ak_id"></param>  
        /// <param name="ak_secret"></param>  
        /// <returns></returns>  
        public static String SendVerifyPost(String body, String ak_id, String ak_secret)  
        {  
            // https 访问需要设置  ************************************************ 需要的  
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;  
  
            String method = "POST";  
            String accept = "application/json";  
            String content_type = "application/json";  
            String path = "/face/verify";  
            String date = toGMTString(DateTime.Now);  
            // 1.对body做MD5+BASE64加密  
            String bodyMd5 = MD5Base64(body);  
            String stringToSign = method + "\n" + accept + "\n" + bodyMd5 + "\n" + content_type + "\n" + date + "\n"  
                    + path;  
            // 2.计算 HMAC-SHA1  
            String signature = HMACSha1(stringToSign, ak_secret);  
            String authHeader = "Dataplus " + ak_id + ":" + signature;  
  
            byte[] postData = Encoding.Default.GetBytes(body);  
  
  
            string result = "";  
            HttpWebRequest req = WebRequest.Create(VerifyURL) as HttpWebRequest;  
            HttpWebResponse res = null;  
            if (req != null)  
            {  
                req.Method = method;  
                req.Accept = accept;  
                req.ContentType = content_type;  
  
                // Date 参数不可直接设置，使用Header.Add 会报错    ************************************************ 需要的  
                MethodInfo priMethod = req.Headers.GetType().GetMethod("AddWithoutValidate", BindingFlags.Instance | BindingFlags.NonPublic);  
                priMethod.Invoke(req.Headers, new[] { "Date", date });  
  
                req.Headers.Add("Authorization", authHeader);  
                if (postData.Length > 0)  
                {  
                    req.ContentLength = postData.Length;  
                    req.Timeout = 15000;  
                    Stream outputStream = req.GetRequestStream();  
                    outputStream.Write(postData, 0, postData.Length);  
                    outputStream.Flush();  
                    outputStream.Close();  
                    try  
                    {  
                        res = (HttpWebResponse)req.GetResponse();  
                        System.IO.Stream InputStream = res.GetResponseStream();  
                        Encoding encoding = Encoding.GetEncoding("UTF-8");  
                        StreamReader sr = new StreamReader(InputStream, encoding);  
                        result = sr.ReadToEnd();  
                    }  
                    catch (Exception ex)  
                    {  
                    }  
                }  
                else  
                {  
                    res = (HttpWebResponse)req.GetResponse();  
                    System.IO.Stream InputStream = res.GetResponseStream();  
                    Encoding encoding = Encoding.GetEncoding("UTF-8");  
                    StreamReader sr = new StreamReader(InputStream, encoding);  
                    result = sr.ReadToEnd();  
                    sr.Close();  
                }  
            }  
            return result;  
        }  
  
        static void Main(string[] args)  
        {  
            String imgUrl1 = "http://pic.hnjsrcw.com/cam_entry/20180511/20391905371813208.jpg";  
            String imgUrl2 = "http://pic.hnjsrcw.com/cam_entry/20180511/20391905371813208.jpg";  
  
            string body = "{\"type\":0,\"image_url_1\":\"" + imgUrl1 + "\",\"image_url_2\":\"" + imgUrl2 + "\"}";  
  
            try  
            {  
                string result = SendVerifyPost(body, "your Access Key ID", "your Access Key Secret");  
                Console.WriteLine(result);  
            }  
            catch (Exception e)  
            {  
                Console.WriteLine(e.Message);  
            }  
        }  
    }  
}  

输出结果：

[javascript]view plain copy
{"confidence":99.99996948242188,"thresholds":[61.0,69.0,75.0],"rectA":[97,45,102,180],"rectB":[97,45,102,180],"errno":0,"request_id":"430dff94-3877-4c7d-92ae-70a0a98ba0a9"}  

人脸识别 API C# 示例代码

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