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我正在开发一个客户端-服务器应用程序，其中我有两个不同的端口，一个（主要）用于我们发送和接收消息或任何其他命令，另一个用于向客户端发送和接收服务器的屏幕截图。从客户端到服务器通知开始我们发送将捕获并显示在一个新窗口中......工作正常但如果我关闭窗口并再次打开它，我无法连接到该端口（绑定失败我）。

我的问题是如何在不影响主端口的情况下清理或完全释放我用于截图的端口，也就是说，当你关闭窗口以释放端口时，就好像我从未使用过一样，并建议客户端也这样做。

在这里我留下代码：

服务器：

int serviceCapture(int port)
{
    int error;
    WSAData wsaDataER;

    error = WSAStartup(MAKEWORD(2, 2), &wsaDataER);

    if (error == SOCKET_ERROR)
    {
        return 1;
    }

   // ShowMessage ("Server: WinSocket Started Correctly!\n");
    sock_ER = socket(AF_INET, SOCK_STREAM, 0);
    if (sock_ER == SOCKET_ERROR)
    {
        return 2;
    }

    struct sockaddr_in escritorioRem; // New! Our network socket structure
    escritorioRem.sin_family = AF_INET; // Always have ti as this for internet
    escritorioRem.sin_port = htons(puerto); // Dont forget the byte ordering
    escritorioRem.sin_addr.s_addr = INADDR_ANY;internet
  if(!enviandoCapturas){
    error = bind(sock_ER, (sockaddr*)&escritorioRem, sizeof(escritorioRem)); // Attempt to bind the socket

    if (error == SOCKET_ERROR)
    {   
        return 3 ;
    }
  }

    error = listen(sock_ER, 1); // Listen for connections

    if (error == SOCKET_ERROR)
    {

        return 4;
    }
    // }
    //ShowMessage ( "Server: Waiting for a client to connect ...\n"); // Just to keep us up to date - ish
      int len= sizeof (struct sockaddr);
      sock_ER=accept(sock_ER,(sockaddr*)&escritorioRem, &len);
     //
    //do{
       if( sock_ER<0){

          return 5;
       }

    sendingCaps=true;

    startSendCaps();

    return 0;
}

客户：

    int client(string serv, int puerto)
{


    int error;
    WSAData wsaData;

    error = WSAStartup(MAKEWORD(2, 2), &wsaData);

    if (error == SOCKET_ERROR)
    {

        return 1;
    }

   // ShowMessage( "Client: WinSocket Loaded.\n");


    if (sock == SOCKET_ERROR)
    {

        return 2;
    }

   // ShowMessage( "Client: Socket Opened Successfully!\n");


    const char *server_name = serv.c_str(); // The server name we will connect to


    struct hostent *host_entry; // Translates into something the computer can understand


    host_entry = gethostbyname(server_name); // Gather out information

    if (host_entry == NULL)
    {

        return 3;
    }


    struct sockaddr_in server;

    server.sin_family = AF_INET;
    server.sin_port = htons((unsigned short) puerto);
    server.sin_addr.s_addr = *(unsigned long*) host_entry->h_addr;


  if(connect(ventanaCliente->sock, (sockaddr*)&server, sizeof(struct sockaddr))<0){

      return 4;
  }
   receivingCaps=true;
   strartReceiveCaps();
    return 0;
}
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