Android平板電腦和PC之間的通信

Question

我開始在Android上，並在我的第一個應用程序中，我需要建立一個PC和Android表之間的通信。我需要的是，staqtic IP直接通信，當我有幾臺PC和平板電腦時，每張桌子只能與PC通信。

從平板電腦到PC的通訊已經在工作，但來自PC表我不能得到數據轉移

的Android側

public class Server implements Runnable 
{ 
    @Override 
    public void run() 
    { 
     while (always==true) 
     { 
      while(start2==false) 
      { 
      } 
      try 
      { 
       InetAddress serverAddr = InetAddress.getByName("192.168.173.133"); 
       updatetrack("\nServer: Start connecting\n"); 
       //*DatagramSocket socket = new DatagramSocket(SERVERPORT2, serverAddr);/ 
       DatagramSocket socket = new DatagramSocket(SERVERPORT2); 

       byte[] buf = new byte[17]; 
       DatagramPacket packet = new DatagramPacket(buf, buf.length, serverAddr, SERVERPORT2); 
       //*DatagramPacket packet = new DatagramPacket(buf, buf.length);/ 
       updatetrack("Server: Receiving\n"); 
       socket.receive(packet); 
       updatetrack("Server: Message received: '" + new String(packet.getData()) + "'\n"); 
       updatetrack("Server: Succeed!\n"); 
       start2=false; 

      } 
      catch (Exception e) 
      { 
       updatetrack("Server: Error!\n"); 
       start2=false; 
      } 
     } 
    } 
}  

192.168.173.133是表IP和SERVERPORT2是4445 當我開始它仍然顯示後等待數據的應用「服務器：在接收」但

C＃代碼

public static void Main() 
{ 
     IPEndPoint iep2 = new IPEndPoint(IPAddress.Parse("192.168.173.133"), 4445); 
     string hostname = Dns.GetHostName(); 
     byte[] data = Encoding.ASCII.GetBytes(hostname); 
     sock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1); 
     sock.SendTo(data, iep2); 
     sock.Close(); 
} 

我想這是任何愚蠢的以爲我忘了，但讀書很多論壇和書籍後，我停止了在這一點上

任何建議將受到歡迎

Answer 1

您使用UDP連接和socket.receive （分組）不等待分組。如果緩衝區中沒有數據包，則此操作會引發異常。 嘗試將代碼改爲：

@Override 
    public void run() 
    { 
     while (always==true) 
     { 
      while(start2==false) 
      { 
      } 
      try 
      { 
       InetAddress serverAddr = InetAddress.getByName("192.168.173.133"); 
       updatetrack("\nServer: Start connecting\n"); 
       //*DatagramSocket socket = new DatagramSocket(SERVERPORT2, serverAddr);/ 
       DatagramSocket socket = new DatagramSocket(SERVERPORT2); 

       while (always==true) 
       { 
       try{ 
       byte[] buf = new byte[17]; 
       DatagramPacket packet = new DatagramPacket(buf, buf.length, serverAddr, SERVERPORT2); 
       //*DatagramPacket packet = new DatagramPacket(buf, buf.length);/ 
       updatetrack("Server: Receiving\n"); 
       socket.receive(packet); 
       updatetrack("Server: Message received: '" + new String(packet.getData()) + "'\n"); 
       updatetrack("Server: Succeed!\n"); 
       start2=false; 
       } 
       catch(Exception ex) {ex.printStackTrace();} 
       } 


      } 
      catch (Exception e) 
      { 
       updatetrack("Server: Error!\n"); 
       start2=false; 
      } 
     } 
    }