Question

我使用过C ++＆amp; Winsock2创建服务器和客户端应用程序。它目前通过创建单独的线程来处理多个客户端连接。

两个客户端连接到服务器。两者连接后，我需要仅向连接的第一个客户端发送消息，然后等待直到收到响应，向第二个客户端发送单独的消息。麻烦的是，我不知道如何定位连接的第一个客户端。 我目前的代码接受两个连接，但邮件被发送到客户端2。

有人可以就如何使用Send（）到特定的客户端给我这么想法吗？感谢

接受连接并启动新线程的代码

        SOCKET TempSock = SOCKET_ERROR;                 // create a socket called Tempsock and assign it the value of SOCKET_ERROR
        while (TempSock == SOCKET_ERROR && numCC !=2)   // Until a client has connected, wait for client connections
        {
            cout << "Waiting for clients to connect...\n\n";

            while ((ClientSocket = accept(Socket, NULL, NULL))) 
            {
            // Create a new thread for the accepted client (also pass the accepted client socket).
            unsigned threadID;
            HANDLE hThread = (HANDLE)_beginthreadex(NULL, 0, &ClientSession, (void*)ClientSocket, 0, &threadID);
            }
        }

的ClientSession（）

    unsigned __stdcall ClientSession(void *data)
    {
        SOCKET ClientSocket = (SOCKET)data;

        numCC ++; // increment the number of connected clients

        cout << "Clients Connected: " << numCC << endl << endl; // output number of clients currently connected to the server

        if (numCC <2) 
            {
                cout << "Waiting for additional clients to connect...\n\n";
            }   

        if (numCC ==2)
        {
        SendRender();       // ONLY TO CLIENT 1???????????


            // wait for client render to complete and receive Done message back
            memset(bufferReply, 0, 999);                                // set the memory of the buffer
            int inDataLength = recv(ClientSocket,bufferReply,1000,0);   // receive data from the server and store in the buffer
            response = bufferReply;                                     // assign contents of buffer to string var 'message'

            cout << response << ". " << "Client 1 Render Cycle complete.\n\n";

            SendRender(); // ONLY TO CLIENT 2????????????
        }
        return 0;
    }

Sendrender（）函数（向客户端发送渲染命令）

    int SendRender()
    {
        // Create message to send to client which will initialise rendering
            char *szMessage = "Render";

            // Send the Render message to the first client
            iSendResult = send(ClientSocket, szMessage, strlen(szMessage), 0);      // HOW TO SEND ONLY TO CLIENT 1???
            if (iSendResult == SOCKET_ERROR) 
        {
                // Display error if unable to send message
                cout << "Failed to send message to Client " << numCC << ": ", WSAGetLastError();
                closesocket(Socket);
                WSACleanup();
                return 1;
        }
            // notify user that Render command has been sent
            cout << "Render command sent to Client " << numCC << endl << endl;

            return 0;
    }

Answer 1

您可以通过添加WaitForSingleObject（或WaitForMultipleObjects）调用为线程提供等待函数和控制函数。那些API调用暂停该线程，直到其他线程设置事件句柄。 API返回值告诉您设置了哪个事件句柄，您可以使用它来确定要采取的操作。

为每个线程使用不同的事件句柄。要将其传递给线程，您将需要一个包含事件句柄和您现在传递的套接字句柄的结构。将指向此结构的指针传递给线程实际上是一种传递两个参数的方法。

您的主线程需要使用CreateEvent来初始化线程句柄。然后在连接两个套接字后，它将设置一个事件（SetEvent），触发第一个线程。

如何选择和发送数据到特定的winsock客户端

1 个答案: