jquery跨域调用WCF

  最近在做了一个web和winform通讯的小东西，第一时间想到了通过wcf监听的方式实现。

  方案：winform启动wcf监听程序，前台通过js调用wcf实现通讯。

  1、添加wcf 控制台程序，修改配置文件 binding="webHttpBinding"。

  2、wcf添加接受程序，并返回

  public string GetHello(string s)
  {
    string result = s;
    Console.WriteLine(s);
    return result;
  }

　3、添加webapplication工程，引用jquery.编写调用js脚本

    function callServer1() {
            //ie下需要编码
            var s = escape($("#title").val());
            $.ajax({
                type: "GET",
                url: "http://192.168.23.24/wcf/GetHello",
                data: "s=" + s + "&r=" + Math.random() * 150 + "&callback=?", //调用服务所需要的参数
                contentType: "text/json;charset=utf-8",
                dataType: "json",
                processData: false,
                success: function(msg) {
                    alert(unescape(msg));
                }
            });
        }

基本功能编写完成，调试后发现，web端无法获取返回信息。通过firefox网络可以发现请求信息如下：

 返回信息以json形式返回，并自动添加了 "d":"我的返回字符"。

 这说明信息已经发送到wcf服务端，但是由于产生跨域调用无法返回给请求端。

经过在网上搜索，发现可以通过返回stream的方式实现跨域调用：

wcf改写后代码：

public Stream GetHello(string s, string callBack)
        {
            //string result = s;
            //Console.WriteLine(s);
            //return result;
            MemoryStream ms = new MemoryStream();
            try
            {
                //接受输入
                Console.WriteLine(System.Web.HttpUtility.UrlDecode(s));

                //IPHostEntry v = System.Net.Dns.Resolve(System.Net.Dns.GetHostName());
                //Console.WriteLine(System.Net.Dns.Resolve(System.Net.Dns.GetHostName()).AddressList.GetValue(0).ToString());//.Current.Request.UserHostAddress;
                //string hostName = System.Net.Dns.GetHostName();
                //IPHostEntry ipHostEntry = System.Net.Dns.GetHostEntry(hostName);


                //OperationContext context = OperationContext.Current;
                //MessageProperties messageProperties = context.IncomingMessageProperties;
                //RemoteEndpointMessageProperty endpointProperty = messageProperties[RemoteEndpointMessageProperty.Name] as RemoteEndpointMessageProperty;
                //var ipmsg = string.Format("Hello {0}! Your IP address is {1} and your port is {2}", s, endpointProperty.Address, endpointProperty.Port);

                //获取客户端请求ip
                WebOperationContext current = WebOperationContext.Current;
                WebHeaderCollection headers = current.IncomingRequest.Headers;
                Uri url = new Uri(headers["referer"]);
                var host = url.Host;
                IPHostEntry cIp = System.Net.Dns.GetHostEntry(host);
                var clientIp = cIp.AddressList.GetValue(0).ToString();
                Console.WriteLine("客户端请求IP:" + clientIp);
                //获取服务本机ip
                string hostName = System.Net.Dns.GetHostName();
                IPHostEntry ipHostEntry = System.Net.Dns.GetHostEntry(hostName);
                var serverIp = ipHostEntry.AddressList.GetValue(0).ToString();
                Console.WriteLine("服务本机IP:" + serverIp);

                System.Runtime.Serialization.Json.DataContractJsonSerializer formater = new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(string));
                formater.WriteObject(ms, s);
                ms.Position = 0;
                string returnStr = "";
                using (StreamReader sr = new StreamReader(ms))
                {
                    string objContent = sr.ReadToEnd();
                    returnStr = callBack + "(" + objContent + ")";
                }
                ms = new MemoryStream();
                StreamWriter sw = new StreamWriter(ms);
                sw.AutoFlush = true;
                sw.Write(returnStr);
                ms.Position = 0;
                WebOperationContext.Current.OutgoingResponse.ContentType = "text/plain"; //此处一定要是“text/plain”

            }
            catch (Exception e)
            { }
            return ms;
        }

重新调用，成功返回。

 

参考网文：http://m.cnblogs.com/11042/1444601.html

源码下载