服务端:

// WSASever.cpp : 定义控制台应用程序的入口点。

//

#include "stdafx.h"

#include <WinSock2.h>

#include <Windows.h>

#pragma comment (lib,"wSock32.lib")

int _tmain(int argc, _TCHAR* argv[])

{

    WORD wVersionRequested;

    WSADATA wsaData;

    int err;

    wVersionRequested = MAKEWORD(, );

    err = WSAStartup(wVersionRequested, &wsaData);

    if (err != ) {

        printf("WSAStartup failed with error: %d\n", err);

        return ;

    }

    if (LOBYTE(wsaData.wVersion) !=  || HIBYTE(wsaData.wVersion) != )

    {

        printf("Could not find a usable version of Winsock.dll\n");

        WSACleanup();

        return ;

    }

    else

        printf("The Winsock 2.2 dll was found okay\n");

    //程序开始

    //创建socket->bing-》listen->accept->recv->send->closesocket

    SOCKET severSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    if (severSocket == INVALID_SOCKET)

    {

        printf("new socket error!");

    }

    SOCKADDR_IN sockAddr;

    sockAddr.sin_port = htons();

    sockAddr.sin_family = AF_INET;

    //IP地址表示方法

    /*方法1：  m_addr.sin_addr.S_un.S_un_b.s_b1 = 192; m_addr.sin_addr.S_un.S_un_b.s_b2 = 168; m_addr.sin_addr.S_un.S_un_b.s_b3 = 0; m_addr.sin_addr.S_un.S_un_b.s_b4 = 1;

    方法2：  m_addr.sin_addr.S_un.S_un_w.s_w1 = (168 << 8) | 192; m_addr.sin_addr.S_un.S_un_w.s_w2 = (1 << 8) | 0;

    方法3：  m_addr.sin_addr.S_un.S_addr = (1 << 24) | (0 << 16) | (168 << 8) | 192

    方法4;    service.sin_addr.s_addr = inet_addr("127.0.0.1");

    */

    //sockAddr.sin_addr.s_addr = inet_addr(INADDR_ANY);

    sockAddr.sin_addr.S_un.S_un_b.s_b1 = ;

    sockAddr.sin_addr.S_un.S_un_b.s_b2 = ;

    sockAddr.sin_addr.S_un.S_un_b.s_b3 = ;

    sockAddr.sin_addr.S_un.S_un_b.s_b4 = ;

    if (bind(severSocket, (sockaddr*)&sockAddr, sizeof(SOCKADDR_IN)) == SOCKET_ERROR)

    {

        printf("bind error! %d\n", WSAGetLastError());

    }

    //监听1个

    if (listen(severSocket, ) == SOCKET_ERROR)

    {

        printf("listen error!%d\n", WSAGetLastError());

    }

    //创建一个一客户端连接的socket

    SOCKET sockLink = accept(severSocket, NULL, NULL);

    if (sockLink != INVALID_SOCKET)

    {

        printf("communication sucess!\n");

    }

    int nErr=;

    while (true)

    {

        char pSeverBuff[MAXBYTE] = {  };

        nErr = recv(sockLink, pSeverBuff, MAXBYTE, );

        printf("%s(%d)%s\n", inet_ntoa(sockAddr.sin_addr), sockAddr.sin_port, pSeverBuff);

        send(sockLink, pSeverBuff, MAXBYTE, );

        //当客户端关闭时，服务端也随之关闭

        if (nErr == INVALID_SOCKET)

            break;

    }

    closesocket(severSocket);

    closesocket(sockLink);

    WSACleanup();

    return ;

}

客户端

// WASClient.cpp : 定义控制台应用程序的入口点。

//

//#include <WinSock2.h>一定要在#include <Windows.h>前面

#include "stdafx.h"

#include <WinSock2.h>

#include <Windows.h>

#pragma comment (lib,"wSock32.lib")

int _tmain(int argc, _TCHAR* argv[])

{

    WORD wVersionRequested;

    WSADATA wsaData;

    int err;

    //版本检测

    wVersionRequested = MAKEWORD(, );

    err = WSAStartup(wVersionRequested, &wsaData);

    if (err != ) {

        printf("WSAStartup failed with error: %d\n", err);

        return ;

    }

    if (LOBYTE(wsaData.wVersion) !=  || HIBYTE(wsaData.wVersion) != )

    {

        printf("Could not find a usable version of Winsock.dll\n");

        WSACleanup();

        return ;

    }

    else

        printf("The Winsock 2.2 dll was found okay\n");

    //程序开始

    //创建socket-》连接connect-》发送send-》接受recv-》释放closesocke

    SOCKET clientSocket=socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    if (clientSocket == INVALID_SOCKET)

    {

        printf("new socket error!");

    }

    SOCKADDR_IN sockAddr;

    //一定要把主机字节序换成网络字节序 并是short类型   htons（）

    sockAddr.sin_port = htons();

    sockAddr.sin_family = AF_INET;

    //IP地址表示方法

    /*方法1：  m_addr.sin_addr.S_un.S_un_b.s_b1 = 192; m_addr.sin_addr.S_un.S_un_b.s_b2 = 168; m_addr.sin_addr.S_un.S_un_b.s_b3 = 0; m_addr.sin_addr.S_un.S_un_b.s_b4 = 1;

    方法2：  m_addr.sin_addr.S_un.S_un_w.s_w1 = (168 << 8) | 192; m_addr.sin_addr.S_un.S_un_w.s_w2 = (1 << 8) | 0;

    方法3：  m_addr.sin_addr.S_un.S_addr = (1 << 24) | (0 << 16) | (168 << 8) | 192*/

    sockAddr.sin_addr.S_un.S_un_b.s_b1 = ;

    sockAddr.sin_addr.S_un.S_un_b.s_b2 = ;

    sockAddr.sin_addr.S_un.S_un_b.s_b3 = ;

    sockAddr.sin_addr.S_un.S_un_b.s_b4 = ;

    if (connect(clientSocket, (sockaddr*)&sockAddr, sizeof(SOCKADDR_IN)) != SOCKET_ERROR)

    {

        printf("communication sucess!\n");

    }

    char pClientBuf[MAXBYTE] = {};

    //请求连接

    while (TRUE)

    {

        gets_s(pClientBuf);

        send(clientSocket, pClientBuf, MAXBYTE, );

        recv(clientSocket, pClientBuf, MAXBYTE, );

        printf("return from sever:%s\n", pClientBuf);

    }

    WSACleanup();

    closesocket(clientSocket);

    return ;

}