WinSock2的简单通信例子

#include <iostream>
#include <WinSock2.h>
#pragma comment(lib, "ws2_32.lib") 
int main()
{
    // 初始化Winsock 2.2
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) == SOCKET_ERROR) {
        printf("WSAStartup ERROR\n");
    }

    // 创建服务器的SOCKET对象
    SOCKET connServer;
    connServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (connServer == INVALID_SOCKET) {
        printf("ConnectServer ERROR\n");
    }

    // 绑定地址和端口
    SOCKADDR_IN addr;
    addr.sin_family = AF_INET;
    addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    addr.sin_port = 9999;
    int errCode = bind(connServer, (SOCKADDR*)&addr, sizeof(addr));
    if (errCode == SOCKET_ERROR) {
        printf("Bind ERROR\n");
        return 0;
    }
    // listen 监听
    errCode = listen(connServer, 1);
    if (errCode == SOCKET_ERROR) {
        printf("Listen ERROR\n");
        return 0;
    }
    // 声明和初始化变量
    SOCKET acceptSocket;       // 执行accept函数后新建用于实际通信的套接字
    int lenSocket = sizeof(acceptSocket);
    SOCKADDR_IN clientSocket;
    int lenClinet = sizeof(clientSocket);
    int bytesRecv = SOCKET_ERROR;
    char sendbuf[64] = "";
    char recvbuf[64] = "";
    acceptSocket = accept(connServer, (SOCKADDR*)&clientSocket, &lenClinet);
    // 循环
    while (true)
    {
        recv(acceptSocket, recvbuf, 64, 0);
        printf("Client: %s\n", recvbuf);
        std::cout << "Server: ";
        std::cin >> sendbuf;
        send(acceptSocket, sendbuf, strlen(sendbuf), 0);
    }
    return 0;
}

#include <iostream>
#include <WinSock2.h>
#pragma comment(lib, "ws2_32.lib")
int main()
{
    // 初始化WinSock
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        printf("初始化出错！\n");
    }
    
    // 创建连接到服务器的SOCKET对象
    SOCKET ConnectSocket;
    ConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (ConnectSocket == INVALID_SOCKET) {
        printf("Error at socket()%ld\n", WSAGetLastError());
        WSACleanup();
        return 0;
    }

    // 构建地址信息
    sockaddr_in clientService;
    clientService.sin_family = AF_INET;
    clientService.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    clientService.sin_port = 9999;

    // 连接到服务器
    if (connect(ConnectSocket, (SOCKADDR*)&clientService, sizeof(clientService)) == SOCKET_ERROR) {
        printf("Failed to connect.\n");
        WSACleanup();
        return 0;
    }
    printf("连接成功！！！\n");
    // 声明和初始化变量
    char sendbuf[64] = "Client: Sending data.\n";
    char recvbuf[64] = "";
    // 发送数据
    while (true)
    {
        // 发送数据
        std::cout << "Client: ";
        std::cin >> sendbuf;
        send(ConnectSocket, sendbuf, strlen(sendbuf), 0);
        // 接受数据
        recv(ConnectSocket, recvbuf, 64, 0);
        printf("Server: %s\n", recvbuf);
    }

    if (WSACleanup() == SOCKET_ERROR) {
        printf("清理错误\n");
    }
    return 0;
}