windows下实现服务端和客户端程序

一、服务端

//初始化WSA
    WORD socketVersion = MAKEWORD(2, 2);
    WSADATA wsaData;//WSADATA结构体变量的地址值
    //成功时返回0
    if (WSAStartup(socketVersion, &wsaData) != 0)
    {
        cout << "WSAStartup() error!" << endl;
        return 0;
    }
    //创建套接字
    SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (slisten == INVALID_SOCKET)
    {
        cout << "socket error" << endl;
        return 0;
    }
    //绑定ip和端口
    sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = htons(8888);
    sin.sin_addr.S_un.S_addr = INADDR_ANY;
    //bind函数把一个地址族中的特定地址赋给socket
    if (bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)
    {
        cout << "bind fail" << endl;
    }
    //开始监听
    std::cout << "开始监听..." << endl;
    if (listen(slisten,5) == SOCKET_ERROR)
    {
        cout << "listen error" << endl;
        return 0;
    }
    //循环接收数据
    SOCKET sclient;
    sockaddr_in remoteAddr;//scoketaddr_in常用于socket的定义
    int nAddrlen = sizeof(remoteAddr);
    char recvData[256] = { 0 };
    while (1)
    {
        cout << "等待连接" << endl;
        sclient = accept(slisten,(sockaddr*)&remoteAddr,&nAddrlen);
        if (sclient == SOCKET_ERROR)
        {
            cout << "accpet error" << endl;
            continue;
        }
        cout << "监听成功" << endl;
        cout << "接收到一个连接" << inet_ntoa(remoteAddr.sin_addr) << endl;
        //接收数据
        int ret = recv(sclient, recvData, 255, 0);
        if (ret > 0)
        {
            recvData[ret] = 0x00;
            cout << recvData << endl;
        }
        //发送数据
        const char* sendData = "你好,客户端!\n";
        send(sclient, sendData, strlen(sendData), 0);
        closesocket(sclient);
    }
    closesocket(slisten);

二、客户端

WORD socketVersion = MAKEWORD(2,2);
WSADATA wsaData;
if (WSAStartup(socketVersion, &wsaData) != 0)
{
std::cout << "初始化网络失败" << endl;
return 0;
}
//创建套接字
SOCKET cSocket = socket(AF_INET,SOCK_STREAM, IPPROTO_TCP);
if (cSocket == INVALID_SOCKET)
{
std::cout << "创建套接字失败" << endl;
return 0;
}
sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
sin.sin_port = htons(8888);

if(connect(cSocket, (SOCKADDR*)&sin, sizeof(SOCKADDR)) == SOCKET_ERROR)
{
cout << "连接服务端失败" << endl;
return 0;
}
cout << "连接服务端成功" << endl;
char recvData[256] = { 0 };
while (true)
{
//发送数据
const char* str = "你好,服务端!\n";
send(cSocket, str, strlen(str), 0);
int ret = recv(cSocket, recvData, 255, 0);
if (ret > 0)
{
recvData[ret] = 0x00;
cout << recvData << endl;
}
closesocket(cSocket);
}
closesocket(cSocket);
WSACleanup();

使用库中的套接字时需要包含以下极端代码

#include <WinSock2.h>

using namespace std;
#pragma comment(lib,"ws2_32.lib")

#define _WINSOCK_DEPRECATED_NO_WARNINGS