C＃和Flex之間的套接字通信問題

Question

我正在實現一個模擬的B/S股票數據系統。我爲客戶端和服務器端使用flex和c＃。我發現閃存有一個安全策略，我在我的服務器代碼中處理策略文件請求。但似乎它不起作用，因爲代碼在連接後跳出「socket.Receive（b）」。我試過在連接處理程序中的客戶端上發送消息，在這種情況下，服務器可以收到正確的消息。但是自動生成的「策略文件請求」永遠不會被接收，並且客戶端不能從服務器獲得數據發送。在這裏，我把我的代碼片段。

我ActionScript代碼：

public class StockClient extends Sprite { 
    private var hostName:String = "192.168.84.103"; 
    private var port:uint = 55555; 
    private var socket:XMLSocket; 

    public function StockClient() { 
     socket = new XMLSocket(); 
     configureListeners(socket); 
     socket.connect(hostName, port); 
    } 

    public function send(data:Object) : void{ 
     socket.send(data); 
    } 

    private function configureListeners(dispatcher:IEventDispatcher):void { 
     dispatcher.addEventListener(Event.CLOSE, closeHandler); 
     dispatcher.addEventListener(Event.CONNECT, connectHandler); 
     dispatcher.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler); 
     dispatcher.addEventListener(ProgressEvent.PROGRESS, progressHandler); 
     dispatcher.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler); 
dispatcher.addEventListener(ProgressEvent.SOCKET_DATA, dataHandler); 
    } 

    private function closeHandler(event:Event):void { 
     trace("closeHandler: " + event); 
    } 

    private function connectHandler(event:Event):void { 
     trace("connectHandler: " + event); 
     //following testing message can be received, but client can't invoke data handler 
//send("<policy-file-request/>"); 
    } 

    private function dataHandler(event:ProgressEvent):void { 
     //never fired 
     trace("dataHandler: " + event); 
    } 

    private function ioErrorHandler(event:IOErrorEvent):void { 
     trace("ioErrorHandler: " + event); 
    } 

    private function progressHandler(event:ProgressEvent):void { 
     trace("progressHandler loaded:" + event.bytesLoaded + " total: " + event.bytesTotal); 
    } 

    private function securityErrorHandler(event:SecurityErrorEvent):void { 
     trace("securityErrorHandler: " + event); 
    } 
} 

我的C＃代碼：

const int PORT_NUMBER = 55555; 
    const String BEGIN_REQUEST = "begin"; 
    const String END_REQUEST = "end"; 
    const String POLICY_REQUEST = "<policy-file-request/>\u0000"; 
    const String POLICY_FILE = "<?xml version=\"1.0\"?>\n" + 
     "<!DOCTYPE cross-domain-policy SYSTEM \"http://www.adobe.com/xml/dtds/cross-domain-policy.dtd\">\n" + 
     "<cross-domain-policy> \n" + 
     " <allow-access-from domain=\"*\" to-ports=\"55555\"/> \n" + 
     "</cross-domain-policy>\u0000";   
    ................ 

    private void startListening() 
    { 
     provider = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); 
     provider.Bind(new IPEndPoint(IPAddress.Parse("192.168.84.103"), PORT_NUMBER)); 
     provider.Listen(10); 
     isListened = true; 

     while (isListened) 
     { 
      Socket socket = provider.Accept(); 
      Console.WriteLine("connect!"); 
      byte[] b = new byte[1024]; 
      int receiveLength = 0; 
      try 
      { 
       // code jump out at this statement 
       receiveLength = socket.Receive(b); 
      } 
      catch (Exception e) 
      { 
       Debug.WriteLine(e.ToString()); 
      } 
      String request = System.Text.Encoding.UTF8.GetString(b, 0, receiveLength); 

      Console.WriteLine("request:"+request); 

      if (request == POLICY_REQUEST) 
      { 
       socket.Send(Encoding.UTF8.GetBytes(POLICY_FILE)); 
       Console.WriteLine("response:" + POLICY_FILE); 
      } 
      else if (request == END_REQUEST) 
      { 
       Dispose(socket); 
      } 
      else 
      { 
       StartSocket(socket); break; 
      } 
     } 
    } 

很抱歉的長碼，請別人幫忙吧，萬分感謝

Answer 1

那是因爲插座策略文件不是在您嘗試加入的端口上請求的，而是在靜態端口843上請求的。

您應該監聽端口843來服務策略請求。另外，在發送策略文件後立即關閉套接字時遇到了一些問題。看來策略文件發送後，套接字應該保持打開幾秒鐘，否則Flash可能會簡單地放棄答案。

請注意，通過這種方式，您可以從另一個應用程序提供策略文件請求，而不是從主服務器中請求。

整個東西在this documentation中描述。