简单的socket通信

//client
#include <iostream>
#include <WinSock2.h>
#pragma comment(lib, "WS2_32")    // 链接到WS2_32.lib
using namespace std;
int main()
{
    SOCKET so;
    WSADATA ws;
    if (WSAStartup(MAKEWORD(2, 2), &ws) != 0)
    {
        cout << "WSAStartup failed" << endl;
    }
    if((so = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
    {
        cout << "socket failed" << endl;
    }
    //绑定地址时需要将主机字节序转换成网络字节序,这个地址是需要连接的ip和端口
    sockaddr_in addr = {0};
    addr.sin_addr.s_addr = inet_addr("127.0.0.1");//此地址是网络字节序，需要将主机字节序抓换成网络字节序,inet_addr:可以转换ip地址
    addr.sin_family = AF_INET;
    addr.sin_port = htons(2000);
    //addr.sin_zero
    if(connect(so, (sockaddr*)&addr, sizeof(sockaddr)) == SOCKET_ERROR)//connect,系统自动分配端口号和IP，无需自己绑定
    {
        cout << "connect failed" << endl;
    }
    char sendBuf[4096];
    while(1)
    {
        fgets(sendBuf, 4096, stdin);
        if(send(so, sendBuf, strlen(sendBuf), 0) < 0)//send
        {
            cout << "send failed" << endl;
        }
    }
    
    system("pause");
    closesocket(so);
    WSACleanup();
    return 0;
}

//server
#include <iostream>
#include <winsock2.h>
#include <windows.h>
#pragma comment(lib, "WS2_32")    // 链接到WS2_32.lib
using namespace std;
int main()
{
    //有一种非阻塞的socket，没有用过
    SOCKET so;
    WSADATA ws;
    if (WSAStartup(MAKEWORD(2, 2), &ws) != 0)
    {
        cout << "WSAStartup failed" << endl;
    }
    if((so = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET)//创建socket
    {
        cout << "scoket failed" << endl;
    }
    sockaddr_in addr = {0};
    addr.sin_addr.s_addr = inet_addr("127.0.0.1");//将字符串ip地址转换成网络字节顺序的整型值
    addr.sin_family = AF_INET;
    addr.sin_port = htons(2000);//此地址是网络字节序，需要将主机字节序抓换成网络字节序
    //addr.sin_zero
    if(bind(so, (struct sockaddr*)&addr, sizeof(sockaddr)) != 0)//bind
    {
        cout << "bind failed" << endl;
    }
    if(listen(so, 10) == -1)//监听so套接字
    {
        cout << "listen failed" << endl;
    }
    sockaddr_in addrclient;
    int client;
    int nrecv;
    char buff[4096];
    while (true)
    {
        if((client = accept(so, (struct sockaddr*)&addrclient, NULL)) == -1)//accept客户端的连接,返回连接的套接字,此函数时阻塞函数
        {
            continue;
        }
        //输出IP
        //cout << inet_ntoa(addrclient.sin_addr.s_addr);//将网络格式的ip转换成.分格式的字符串
        while (true)
        {
            nrecv = recv(client, buff, 4096, 0);//recv也是阻塞函数
            buff[nrecv] = ‘\0‘;
            cout << buff << endl;
        }

    }
    
    WSACleanup();
    system("pause");
    return 0;
}