c++怎么使用socket进行TCP网络编程_c++实现TCP通信的基本步骤

#ifdef _WIN32
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        std::cerr << "WSAStartup failed!" << std::endl;
        return -1;
    }
#endif

int sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock == -1) {
    std::cerr << "Socket creation failed!" << std::endl;
    return -1;
}

sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(8080);           // 端口转为网络字节序
addr.sin_addr.s_addr = INADDR_ANY;     // 绑定本机所有IP
<p>if (bind(sock, (sockaddr*)&addr, sizeof(addr)) == -1) {
std::cerr << "Bind failed!" << std::endl;
return -1;
}

if (listen(sock, 5) == -1) {  // 最多允许5个连接排队
    std::cerr << "Listen failed!" << std::endl;
    return -1;
}

sockaddr_in clientAddr;
int clientAddrSize = sizeof(clientAddr);
int clientSock = accept(sock, (sockaddr*)&clientAddr, &clientAddrSize);
<p>if (clientSock == -1) {
std::cerr << "Accept failed!" << std::endl;
} else {
std::cout << "Client connected!" << std::endl;
}

sockaddr_in serverAddr;
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(8080);
serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");  // 服务端IP
<p>if (connect(sock, (sockaddr*)&serverAddr, sizeof(serverAddr)) == -1) {
std::cerr << "Connect failed!" << std::endl;
return -1;
}
std::cout << "Connected to server!" << std::endl;

// 发送
const char* msg = "Hello, Server!";
send(clientSock, msg, strlen(msg), 0);
<p>// 接收
char buffer[1024] = {0};
int bytes = recv(clientSock, buffer, sizeof(buffer)-1, 0);
if (bytes > 0) {
std::cout << "Received: " << buffer << std::endl;
}

#ifdef _WIN32
    closesocket(sock);
    WSACleanup();
#else
    close(sock);
#endif