微信公众号链接分享开发和遇到的问题

1.先看前端代码。

网上查了很多资料，前端代码是这样的

（1）需要引用官方的js文件： 

（2）相信查过其它资料的大兄弟们都能看的懂，这里唯一要点是微信签名怎么生成

2.接下去我们来看微信签名怎么生成

（1）先取到“access_token” ，注意这里的access_token和“https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code” 授权后用code获取的access_token是不一样的，这里需要用“https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}”这个接口获取。

BaseAccessTokenDTO BaseAccessTokenDTO = this.Post(string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", appID, appsecret));
                       

（2）接着通过access_token获取“ticket”

ticketDTO ticketDTO = this.Post(string.Format("https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token={0}&type=jsapi", BaseAccessTokenDTO.access_token)); 
JSApiTicket = CreateSignature(appID, ticketDTO.ticket, Request.Url.AbsoluteUri);

“JSApiTicket”是一个json变量，会赋值给前台，“CreateSignature(appID, ticketDTO.ticket, Request.Url.AbsoluteUri)” 是一个拼接签名的方法

  /// 

        /// 生成微信签名
        /// 
        /// 
        public string CreateSignature(string APPID, string Ticket, string url)
        {

            var ticket = Ticket;
            string noncestr = CreatenNonce_str();
            long timestamp = CreatenTimestamp();

            var string1Builder = new StringBuilder();
            string1Builder.Append("jsapi_ticket=").Append(ticket).Append("&")
                          .Append("noncestr=").Append(noncestr).Append("&")
                          .Append("timestamp=").Append(timestamp).Append("&")
                          .Append("url=").Append(url.IndexOf("#") >= 0 ? url.Substring(0, url.IndexOf("#")) : url);
            string string1 = string1Builder.ToString();

            //建立SHA1对象
            SHA1 sha = new SHA1CryptoServiceProvider();
            //将mystr转换成byte[]
            ASCIIEncoding enc = new ASCIIEncoding();
            byte[] dataToHash = enc.GetBytes(string1);
            //Hash运算
            byte[] dataHashed = sha.ComputeHash(dataToHash);
            //将运算结果转换成string
            string hash = BitConverter.ToString(dataHashed).Replace("-", "");

            FileWrite.WriteTextLog("签名jsapi_ticket：" + ticket);
            FileWrite.WriteTextLog("签名signature：" + string1);

            return "{\"appId\":\"" + APPID + "\",\"timestamp\":\"" + timestamp + "\",\"nonceStr\":\"" + noncestr + "\",\"signature\":\"" + hash + "\"}";
        }

        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"
        };

        /// 

        /// 创建随机字符串
        ///本代码来自开源微信SDK项目：https://github.com/night-king/weixinSDK
        /// 
        /// 
        public 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();
        }

        /// 

        /// 创建时间戳
        ///本代码来自开源微信SDK项目：https://github.com/night-king/weixinSDK
        /// 
        /// 
        public long CreatenTimestamp()
        {
            return (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000;
        }

 

开发过程中遇到的问题：“config:invalid url donmain” 。  wx.config中报错

开始以为是签名生成的不对，后来发现还需要在公众号平台上面配置“JS接口域名”

下图