用Microsoft VisualC++编写写一个简单的客户机／服务器程序，要求当客户机向服务器发出请求时，给客户机传输" iello , World !"信息。

在 Microsoft Visual C++ 中创建一个简单的客户端/服务器程序涉及到几个步骤。这里是一个简化的例子，我们将使用套接字编程来实现这个功能。由于这是一个文本平台，我将提供伪代码描述，实际代码需要在Visual Studio环境中编写。

**服务器端 (Server.cpp)**

#include <winsock2.h>
#include <iostream>

#pragma comment(lib, "ws2_32.lib")

int main() {
    // 创建套接字
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        std::cerr << "WSAStartup failed: " << WSAGetLastError() << std::endl;
        return 1;
    }

    SOCKET serverSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (serverSocket == INVALID_SOCKET) {
        std::cerr << "socket creation failed: " << WSAGetLastError() << std::endl;
        WSACleanup();
        return 1;
    }

    sockaddr_in serverAddr;
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(12345); // 端口号
    serverAddr.sin_addr.s_addr = INADDR_ANY; // 任意地址

    bind(serverSocket, (SOCKADDR*)&serverAddr, sizeof(serverAddr));
    listen(serverSocket, SOMAXCONN);

    while (true) {
        SOCKET clientSocket = accept(serverSocket, NULL, NULL);
        if (clientSocket == INVALID_SOCKET) {
            std::cerr << "accept failed: " << WSAGetLastError() << std::endl;
            continue;
        }

        char message[] = "Hello, World!"; // 要发送的消息
        send(clientSocket, message, strlen(message) + 1, 0); // 发送消息

        closesocket(clientSocket);
    }

    closesocket(serverSocket);
    WSACleanup();

    return 0;
}

**客户端 (Client.cpp)**

#include <winsock2.h>
#include <iostream>

#pragma comment(lib, "ws2_32.lib")

int main() {
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        std::cerr << "WSAStartup failed: " << WSAGetLastError() << std::endl;
        return 1;
    }

    SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (clientSocket == INVALID_SOCKET) {
        std::cerr << "socket creation failed: " << WSAGetLastError() << std::endl;
        WSACleanup();
        return 1;
    }

    sockaddr_in serverAddr;
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(12345); // 服务器端口
    inet_aton("localhost", &serverAddr.sin_addr); // 地址替换为你服务器的实际IP

    connect(clientSocket, (SOCKADDR*)&serverAddr, sizeof(serverAddr));

    char buffer[1024];
    recv(clientSocket, buffer, sizeof(buffer), 0); // 接收服务器响应

    std::cout << "Received from server: " << buffer << std::endl;

    closesocket(clientSocket);
    WSACleanup();

    return 0;
}

要运行这个程序，首先需要链接到Winsock库（ws2_32.lib），然后在Visual Studio中分别编译和运行 `Server.exe` 和 `Client.exe`。当客户端连接到服务器并发送请求时，服务器会回复 "Hello, World!"。