win32控制台应用程序TCP服务器 向客户端发送数据三次代码

在Windows环境下创建一个简单的TCP服务器，向连接的客户端发送三次数据，可以使用C++的Winsock库。以下是基本的代码示例：

#include <winsock2.h>
#include <ws2tcpip.h>
#include <iostream>

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

int main() {
    WSADATA wsaData;
    int iResult;

    // 初始化 Winsock
    iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (iResult != 0) {
        std::cerr << "WSAStartup failed: " << WSAGetLastError() << std::endl;
        return 1;
    }

    SOCKET ListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (ListenSocket == INVALID_SOCKET) {
        closesocket(ListenSocket);
        WSACleanup();
        std::cerr << "Could not create a listening socket" << std::endl;
        return 1;
    }

    sockaddr_in ServerAddr;
    ServerAddr.sin_family = AF_INET;
    ServerAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
    ServerAddr.sin_port = htons(8080); // 设置端口

    // 绑定监听套接字到地址
    if (bind(ListenSocket, (SOCKADDR*)&ServerAddr, sizeof(ServerAddr)) == SOCKET_ERROR) {
        closesocket(ListenSocket);
        WSACleanup();
        std::cerr << "bind failed: " << WSAGetLastError() << std::endl;
        return 1;
    }

    listen(ListenSocket, SOMAXCONN);

    std::cout << "Listening for connections on port 8080..." << std::endl;

    // 接收客户端连接并循环发送数据
    char sendData[] = "Hello Client! This is the first message.\n";
    while (true) {
        SOCKET ClientSocket = accept(ListenSocket, NULL, NULL);
        if (ClientSocket == INVALID_SOCKET) {
            std::cerr << "accept failed: " << WSAGetLastError() << std::endl;
            break;
        }

        iResult = send(ClientSocket, sendData, strlen(sendData), 0);
        if (iResult > 0) {
            std::cout << "Sent data to client." << std::endl;
        } else if (iResult == 0) {
            std::cerr << "send failed: " << WSAGetLastError() << std::endl;
        } else {
            std::cerr << "Error sending data: " << WSAGetLastError() << std::endl;
        }

        // 发送第二次和第三次数据
        char sendData2[] = "This is the second message.\n";
        iResult = send(ClientSocket, sendData2, strlen(sendData2), 0);
        if (iResult > 0) {
            std::cout << "Sent data to client." << std::endl;
        }
        
        char sendData3[] = "And this is the third message.\n";
        iResult = send(ClientSocket, sendData3, strlen(sendData3), 0);
        if (iResult > 0) {
            std::cout << "Sent data to client." << std::endl;
        }

        closesocket(ClientSocket);
    }

    closesocket(ListenSocket);
    WSACleanup();

    return 0;
}