基于TCP的socket编程(C++)

服务器端

//TCP服务端
#include<winsock2.h>                                //包含头文件
#include<stdio.h>
#include<windows.h>
#include<iostream>
#include<ws2tcpip.h>
 
#pragma comment(lib, "WS2_32.lib")                 //显示连接套接字库
 
using namespace std;
 
int main()
{
    WSADATA data;                                 //定义WSADATA结构体对象
    WORD w = MAKEWORD(2, 0);                      //定义版本号码
    ::WSAStartup(w, &data);                       //初始化套接字
    SOCKET s;                                     //定义连接套接字和数据收发套接字句柄
    s = ::socket(AF_INET, SOCK_STREAM, 0);        //创建tcp套接字
    sockaddr_in addr;                             //定义套接字地址结构
    addr.sin_family = AF_INET;                    //初始化地址结构
    addr.sin_port = htons(75);
    addr.sin_addr.S_un.S_addr = INADDR_ANY;
    ::bind(s, (sockaddr*)&addr, sizeof(addr));    //绑定套接字
    ::listen(s, 5);                               //监听套接字,5并不是时间而是最大监听5个
    cout << "服务端已启动..." << endl;
 
    sockaddr_in addr2;
    int n = sizeof(addr2);
    SOCKET s1;
    char sztext[] = "您已成功连接服务端...\n";
    char buffer[17];
    while (true)
    {
 
        s1 = ::accept(s, (sockaddr*)&addr2, &n);            //接受连接请求
        if (s1 != NULL)                                     //不能使用s1 ！= nullptr
        {
            cout <<"地址:" << inet_ntop(AF_INET, (const void*)&addr2.sin_addr, buffer, 17) << "已经连接到服务端" << endl;
            ::send(s1, sztext, sizeof(sztext), 0);             //向客户端发送信息
        }
        ::closesocket(s);                                  //关闭套接字句柄
        ::closesocket(s1);
        ::WSACleanup();                                    //释放套接字库
 
        if (getchar())
        {
            return 0;
        }
        else
        {
            ::Sleep(100);
        }
    }
}

　　客户端：

/*
* TCP客户端代码
*/
 
#include<winsock2.h>
#include<stdio.h>
#include<Windows.h>
#include<iostream>
#include<ws2tcpip.h>
 
#pragma comment(lib, "WS2_32.lib")                  //显示连接套接字库
 
using namespace std;
 
int main()
{
    WSADATA data;                                  //定义WSADATA结构体对象
    WORD w = MAKEWORD(2, 0);                       //定义版本号码
    ::WSAStartup(w, &data);                        //初始化套接字库
    SOCKET s = ::socket(AF_INET, SOCK_STREAM, 0);  //定义连接套接字句柄
    sockaddr_in addr;                             //定义套接字地址结构
    addr.sin_family = AF_INET;
    addr.sin_port = htons(75);
    inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr.S_un.S_addr);
    cout << "客户端已启动..." << endl;
    ::connect(s, (sockaddr*)&addr, sizeof(addr));
    char sztext[50];
    ::recv(s,sztext, sizeof(sztext), 0);
    cout<<sztext<<endl;
    ::closesocket(s);
    ::WSACleanup();
    if (getchar())
    {
        return 0;
    }
    else
    {
        ::Sleep(100);              
    }
    return 0;
}