微信扫一扫功能实现-附全部代码

偏执的太偏执、 2023-06-05 11:15 21阅读 0赞

首先在调用微信的JS-SDK接口的时候需要仔细阅读一下官方的注意事项，否则可能事倍功半。这里先大概概述一下主要的流程，首先，使用微信扫一扫需要一个已经通过认证的公众号；其次，需要知道公众号的APPID以及APPSecrect，以便获取Access\_Token和Ticket；再有就是需要了解.NET内部的SHA1的加密类；最后引用官方的JS，就可以了。

# VIEW代码 #

需要注意的是，公众号一定要有域名绑定

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<!DOCTYPE html>
    
    <html>
    <head>
        <meta name="viewport" content="width=device-width" />
        <title>Index</title>
        <script src="http://res.wx.qq.com/open/js/jweixin-1.1.0.js"> </script> 
        <script src="http://libs.baidu.com/jquery/2.0.0/jquery.js"></script>
        <script src="~/Script/WxScanQRCode.js"></script>
        <script>
            wx.config({
            debug: true, // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。  
            appId: '@ViewBag.appid', // 必填，公众号的唯一标识  
            timestamp: '@ViewBag.timestamp', // 必填，生成签名的时间戳  
            nonceStr: '@ViewBag.noncestr', // 必填，生成签名的随机串  
            signature: '@ViewBag.sinature',// 必填，签名  
            jsApiList: ['checkJsApi',
            //这里的接口在官方文档中都有涉及，我们只需要调用微信扫一扫即可
                        //'chooseImage',
                        //'previewImage',
                        // 'uploadImage',
                        // 'downloadImage',
                        //  'getNetworkType',//网络状态接口
                        //  'openLocation',//使用微信内置地图查看地理位置接口
                        //  'getLocation', //获取地理位置接口
                        //  'hideOptionMenu',//界面操作接口1
                        //  'showOptionMenu',//界面操作接口2
                        //  'closeWindow',  界面操作接口3
                        //  'hideMenuItems',界面操作接口4
                        //  'showMenuItems',界面操作接口5
                        //  'hideAllNonBaseMenuItem',界面操作接口6
                        //  'showAllNonBaseMenuItem',界面操作接口7
                          'scanQRCode'// 微信扫一扫接口
            ]  
            });
            
            function scan(){
                wx.ready(function () {
                    var _scan = document.getElementById("url");
                    _scan.value = window.location.href;
                    wx.scanQRCode({
                        needResult: 1,
                        desc: 'scanQRCode desc',
                        success: function (res) {
                            alert(JSON.stringify(res));
                        }
                    });
                })
            }
        </script>
    </head>
    
    <body>
        <div>
            <input type="text" name ="url" id="url">
            <button id="scanbutton" type="button" οnclick="scan()">click here to scan</button>
        </div>
    </body>
    </html>

![复制代码][copycode.gif]

# Controller代码 #

首先，我们需要根据APPID和APPSecrect来获取Access\_Token，之后根据AccessToken来获取jsapi\_ticket。最后，在Controller内部生成时间戳，随机字符串，之后将ticket以及前两者根据SHA1加密成签名,并发送给微信服务器，通过认证之后，这样就可以调用扫一扫的接口了。

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public ActionResult Index()
            {
                //获取ACCESS_TOKEN
                string _url = Request.Url.ToString();
                //获取Ticket
                string _ticket = Requestjsapi_ticket(Request_Url());
                //获取ticket
                string _finalticket = _ticket;
                //获取noncestr
                string _noncestr = CreatenNonce_str();
                //获取timestamp
                long _timestamp = CreatenTimestamp();
                //获取sinature
                string _sinature = GetSignature(_finalticket, _noncestr, _timestamp, _url).ToLower();
    
                ViewBag.appid = "这里填写你的APPID";
                ViewBag.timestamp = _timestamp;
                ViewBag.noncestr = _noncestr;
                ViewBag.sinature = _sinature;
                return View();
    
            }
    
    //获取AccessToken
            public static string Request_Url()
            {
                // 设置参数
                string _appid = "这里写入你的APPID";
                string _appsecret = "这里写入你的APPSecrect";
                string _url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + _appid + "&secret=" + _appsecret;
                string method = "GET";
                HttpWebRequest request = WebRequest.Create(_url) as HttpWebRequest;
                CookieContainer cookieContainer = new CookieContainer();
                request.CookieContainer = cookieContainer;
                request.AllowAutoRedirect = true;
                request.Method = method;
                request.ContentType = "text/html";
                request.Headers.Add("charset", "utf-8");
    
                //发送请求并获取相应回应数据
                HttpWebResponse response = request.GetResponse() as HttpWebResponse;
                //直到request.GetResponse()程序才开始向目标网页发送Post请求
                Stream responseStream = response.GetResponseStream();
                StreamReader sr = new StreamReader(responseStream, Encoding.UTF8);
                //返回结果网页（html）代码
                string content = sr.ReadToEnd();
                //由于微信服务器返回的JSON串中包含了很多信息，我们只需要将AccessToken获取就可以了，需要将JSON拆分
                String[] str = content.Split('"');
                content = str[3];
                return content;
            }
    
     //根据AccessToken来获取jsapi_ticket
            public static string Requestjsapi_ticket(string accesstoken)
            {
    
                string _accesstoken = accesstoken;
                string url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=" + _accesstoken + "&type=jsapi";
                string method = "GET";
                HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
                CookieContainer cookieContainer = new CookieContainer();
                request.CookieContainer = cookieContainer;
                request.AllowAutoRedirect = true;
                request.Method = method;
                request.ContentType = "text/html";
                request.Headers.Add("charset", "utf-8");
                //发送请求并获取相应回应数据
                HttpWebResponse response = request.GetResponse() as HttpWebResponse;
                //直到request.GetResponse()程序才开始向目标网页发送Post请求
                Stream responseStream = response.GetResponseStream();
                StreamReader sr = new StreamReader(responseStream, Encoding.UTF8);
                //返回结果网页（html）代码
                string content = sr.ReadToEnd();
                //同样，返回的JSON中只要取出ticket的信息即可
                String[] str = content.Split('"');
                content = str[9];
                return content;
            }
    
    //接下来就是辅助工具类，生成随机字符串
    #region 字符串随机 CreatenNonce_str()
            private static string[] strs = new string[]
                                        {
                                        "a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z",
                                        "A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"
                                        };
            public static string CreatenNonce_str()
            {
                Random r = new Random();
                var sb = new StringBuilder();
                var length = strs.Length;
                for (int i = 0; i < 15; i++)
                {
                    sb.Append(strs[r.Next(length - 1)]);
                }
                return sb.ToString();
            }
            #endregion
    
    //生成时间戳，备用
     #region 时间戳生成 CreatenTimestamp()
            public static long CreatenTimestamp()
            {
                return (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000;
            }
            #endregion
    
    //获取签名，这里的三个参数分别为前面生成的ticket，随机字符串以及时间戳
    #region 获取签名 GetSignature()
            public static string GetSignature(string jsapi_ticket, string noncestr, long timestamp,string url)
            {
    
                var string1Builder = new StringBuilder();
                string1Builder.Append("jsapi_ticket=").Append(jsapi_ticket).Append("&")
                              .Append("noncestr=").Append(noncestr).Append("&")
                              .Append("timestamp=").Append(timestamp).Append("&")
                              .Append("url=").Append(url.IndexOf("#") >= 0 ? url.Substring(0, url.IndexOf("#")) : url);
                return SHA1(string1Builder.ToString());
            }
            #endregion
    
    
    //最后就是SHA1的加密算法工具
     #region 加密签名算法 SHA1(content)
            //加密签名算法
            public static string SHA1(string content)
            {
                return SHA1(content, Encoding.UTF8);
    
            }
            //加密签名
            public static string SHA1(string content, Encoding encode)
            {
                try
                {
                    SHA1 sha1 = new SHA1CryptoServiceProvider();
                    byte[] bytes_in = encode.GetBytes(content);
                    byte[] bytes_out = sha1.ComputeHash(bytes_in);
                    sha1.Dispose();
                    string result = BitConverter.ToString(bytes_out);
                    result = result.Replace("-", "");
                    return result;
                }
                catch (Exception ex)
                {
                    throw new Exception("SHA1加密出错：" + ex.Message);
                }
            }  
            #endregion

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# 总结 #

代码复制即可使用，需要注意的还是公众号的认证，域名的绑定，以及最后加密算法生成的字符串的正确性，少了哪一步，我们都不会得到一个正确的返回结果。

转载：https://blog.csdn.net/SugaryoTT/article/details/78558105

转载于:https://www.cnblogs.com/macT/p/11579449.html

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