C++获取网页信息

#include "stdafx.h"
#include<winsock.h>
#include<stdio.h>
#include<string>
#include<iostream>
using namespace std;
#define WSWENS MAKEWORD(2,0)
int _tmain(int argc, _TCHAR* argv[])
{
    sockaddr_in sin;
    WSADATA wsadata;
    /*WSAStartup()的调用方和Windows Sockets DLL互相通知对方它们可以支持的最高版本,并且互相确认对方的最高版本是可接受的. 在WSAStartup()函数的入口,Windows Sockets DLL检查了应用程序所需的版本.如果版本高于DLL支持的最低版本,则调用成功并且DLL在wHighVersion中返回它所支持的最高版本，在 wVersion中返回它的高版本和wVersionRequested中的较小者.然后Windows Sockets DLL就会假设应用程序将使用wVersion.*/
    if(WSAStartup(WSWENS,&wsadata)!=0)

        cout<<"startup failed"<<endl;

    SOCKET s = socket(PF_INET,SOCK_STREAM,0);
    // memset 是对一段内存空间全部设置为某个字符
    memset(&sin,0,sizeof(sin));
    sin.sin_family = AF_INET;
    sin.sin_port = htons(80);
    //sin.sin_addr.S_un.S_addr=inet_addr("203.208.37.99");
    hostent* hptr = gethostbyname("www.google.cn");
    // 将有参数的string内容copy到左边参数
    memcpy(&sin.sin_addr.S_un.S_addr,hptr->h_addr,hptr->h_length);
    printf("IP address:%d.%d.%d.%d/n",sin.sin_addr.S_un.S_un_b.s_b1,
        sin.sin_addr.S_un.S_un_b.s_b2,
        sin.sin_addr.S_un.S_un_b.s_b3,
        sin.sin_addr.S_un.S_un_b.s_b4);
    // 将sockaddr_in transfer to sockaddr
    if(connect(s,(sockaddr*)&sin,sizeof(sin)))
    {
        cout<<"connect failed"<<endl;
        return 0;
    }
    else
    {
        cout<<"connect success"<<endl;
    }
    char buffersend[]="GET/HTTP1.1/nHOST:www.google.cn/nconnection:close/n/n";
    send(s,buffersend,strlen(buffersend),0);
    /*string ss;
    int len = recv(s,const_cast<char*>(ss.c_str()),2000,0);*/
    char bufferecv[10240];
    int len=recv(s,bufferecv,10240,0);
    printf("the length of page is %d/n", len);
    if(len==-1)
    {
        cout<<"receive failed"<<endl;
        return -1;
    }
    else
        cout<<"receive success"<<endl;
    for (int i = 0; i < len; i++)
        printf("%c",bufferecv[i]);
    WSACleanup();
    closesocket(s);
    return 0;
}

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