首先在調用微信的JS-SDK接口的時候需要仔細閱讀一下官方的注意事項，否則可能事倍功半。這里先大概概述一下主要的流程，首先，使用微信掃一掃需要一個已經通過認證的公眾號；其次，需要知道公眾號的APPID以及APPSecrect，以便獲取Access_Token和Ticket；再有就是需要了解.NET內部的SHA1的加密類；最后引用官方的JS，就可以了。
VIEW代碼
需要注意的是，公眾號一定要有域名綁定
<!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, // 開啟調試模式,調用的所有api的返回值會在客戶端alert出來，若要查看傳入的參數，可以在pc端打開，參數信息會通過log打出，僅在pc端時才會打印。
appId: '@ViewBag.appid', // 必填，公眾號的唯一標識
timestamp: '@ViewBag.timestamp', // 必填，生成簽名的時間戳
nonceStr: '@ViewBag.noncestr', // 必填，生成簽名的隨機串
signature: '@ViewBag.sinature',// 必填，簽名
jsApiList: ['checkJsApi',
//這里的接口在官方文檔中都有涉及，我們只需要調用微信掃一掃即可
//'chooseImage',
//'previewImage',
// 'uploadImage',
// 'downloadImage',
// 'getNetworkType',//網絡狀態接口
// 'openLocation',//使用微信內置地圖查看地理位置接口
// 'getLocation', //獲取地理位置接口
// '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'// 微信掃一掃接口
]
});
<!--開始掃描-->
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" onclick="scan()">click here to scan</button>
</div>
</body>
</html>
Controller代碼
首先，我們需要根據APPID和APPSecrect來獲取Access_Token，之后根據AccessToken來獲取jsapi_ticket。最后，在Controller內部生成時間戳，隨機字符串，之后將ticket以及前兩者根據SHA1加密成簽名,並發送給微信服務器，通過認證之后，這樣就可以調用掃一掃的接口了。
public ActionResult Index()
{
//獲取ACCESS_TOKEN
string _url = Request.Url.ToString();
//獲取Ticket
string _ticket = Requestjsapi_ticket(Request_Url());
//獲取ticket
string _finalticket = _ticket;
//獲取noncestr
string _noncestr = CreatenNonce_str();
//獲取timestamp
long _timestamp = CreatenTimestamp();
//獲取sinature
string _sinature = GetSignature(_finalticket, _noncestr, _timestamp, _url).ToLower();
ViewBag.appid = "這里填寫你的APPID";
ViewBag.timestamp = _timestamp;
ViewBag.noncestr = _noncestr;
ViewBag.sinature = _sinature;
return View();
}
//獲取AccessToken
public static string Request_Url()
{
// 設置參數
string _appid = "這里寫入你的APPID";
string _appsecret = "這里寫入你的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");
//發送請求並獲取相應回應數據
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
//直到request.GetResponse()程序才開始向目標網頁發送Post請求
Stream responseStream = response.GetResponseStream();
StreamReader sr = new StreamReader(responseStream, Encoding.UTF8);
//返回結果網頁（html）代碼
string content = sr.ReadToEnd();
//由於微信服務器返回的JSON串中包含了很多信息，我們只需要將AccessToken獲取就可以了，需要將JSON拆分
String[] str = content.Split('"');
content = str[3];
return content;
}
//根據AccessToken來獲取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");
//發送請求並獲取相應回應數據
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
//直到request.GetResponse()程序才開始向目標網頁發送Post請求
Stream responseStream = response.GetResponseStream();
StreamReader sr = new StreamReader(responseStream, Encoding.UTF8);
//返回結果網頁（html）代碼
string content = sr.ReadToEnd();
//同樣，返回的JSON中只要取出ticket的信息即可
String[] str = content.Split('"');
content = str[9];
return content;
}
//接下來就是輔助工具類，生成隨機字符串
#region 字符串隨機 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
//生成時間戳，備用
#region 時間戳生成 CreatenTimestamp()
public static long CreatenTimestamp()
{
return (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000;
}
#endregion
//獲取簽名，這里的三個參數分別為前面生成的ticket，隨機字符串以及時間戳
#region 獲取簽名 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 加密簽名算法 SHA1(content)
//加密簽名算法
public static string SHA1(string content)
{
return SHA1(content, Encoding.UTF8);
}
//加密簽名
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加密出錯：" + ex.Message);
}
}
#endregion
總結
代碼復制即可使用，需要注意的還是公眾號的認證，域名的綁定，以及最后加密算法生成的字符串的正確性，少了哪一步，我們都不會得到一個正確的返回結果。
轉載：https://blog.csdn.net/SugaryoTT/article/details/78558105