windows之socket编程示例

1. tcp服务器端

#include "stdafx.h"

#include <WINSOCK2.H>
#include <windows.h>
#include <iostream>
#include <string>

#pragma     comment(lib, "ws2_32.lib ") 

using namespace std;


DWORD WINAPI ClientThread(LPVOID sockCliet);

int _tmain(int argc, _TCHAR* argv[])
{
    
    // 0 --- 加载套接字库
    WSAData wsaData;
    WSAStartup(MAKEWORD(2,2), &wsaData);

    // 1 --- 创建套接字
    SOCKET serSock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    // 2 --- 绑定套接字
    SOCKADDR_IN addrService;
    addrService.sin_family = AF_INET;
    addrService.sin_addr.s_addr = inet_addr("127.0.0.1");
    addrService.sin_port = htons(6000);
    bind(serSock, (sockaddr *)&addrService, sizeof(addrService));
    
    // 3 --- 指定最大同时连接数，开始监听
    listen(serSock, 10);


    // 4 --- 接受新的连接，创建线程处理本次连接
    while (1)
    {
        SOCKADDR_IN addrClient;
        int n = sizeof(addrClient);
        SOCKET newSock = accept(serSock, (sockaddr*)&addrClient, &n);    // newSock应该在子线程中关闭
        if (newSock != INVALID_SOCKET)
        {
            /*
             5 --- 利用返回的套接字和客户端进行通信
             6 --- 关闭套接字
             这两步都在子线程中进行
            */
            HANDLE hThread = CreateThread(NULL, 0, ClientThread, (LPVOID)newSock, 0, NULL); 
            CloseHandle(hThread);    // 减小引用计数，并不会关闭线程,线程创建时，引用计数为2
        }
        else
        {
            break;
        }
    }
    
    // 7 --- 关闭套接字
    closesocket(serSock);
    
    // 8 --- 关闭加载的套接字库
    WSACleanup(); 
    return 0;
}

/****************************
    和客户端进行通信的子进程
*****************************/

DWORD WINAPI ClientThread(LPVOID sockClient) 
{
    SOCKET  sock = (SOCKET)sockClient;
    char buffer[100] = {0};
    
    while (1)
    {
        int recvLen = recv(sock, buffer, 100, 0);
        if ( 0 == recvLen)    break;
        cout << "message from client: " << buffer << endl;
        //send(sock, "welcome.", strlen("welcome."), 0);
    }

    closesocket(sock);

    return 0;
}

2. tcp客户端

#include "stdafx.h"

#include <WINSOCK2.H>
#include <windows.h>
#include <iostream>
#include <string>

#pragma     comment(lib, "ws2_32.lib ") 

using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
    // 0 --- 加载套接字库
    WSAData wsaData;
    WSAStartup(MAKEWORD(2, 2), &wsaData);
    
    // 1 --- 创建套接字
    SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    // 2 --- 绑定套接字
    sockaddr_in serverAddr;
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    serverAddr.sin_port = htons(6000);

    // 3 --- 向服务器发出连接请求
    connect(clientSocket, (sockaddr*)&serverAddr, sizeof(serverAddr));

    // 4 --- 和服务器端进行通信(send/recv)
    while (1)
    {
        Sleep(10000);
        send(clientSocket, "welcome.", strlen("welcome."), 0);
    }

    // 5 --- 关闭套接字
    closesocket(clientSocket);

    // 6 --- 关闭加载的套接字库
    WSACleanup(); 

    return 0;
}