C++ http get下载网页源码

例子1：wininet

#include <stdio.h>

#include <windows.h>
#include <wininet.h>
#define MAXSIZE 1024
#pragma comment(lib, "Wininet.lib") 
void urlopen(_TCHAR*);


int _tmain(int argc, _TCHAR* argv[])
{
    urlopen(_T("http://www.jb51.net"));
    return 0;
}
void urlopen(_TCHAR* url)
{
    HINTERNET hSession = InternetOpen(_T("UrlTest"), INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
    if(hSession != NULL)
    {
        HINTERNET hHttp = InternetOpenUrl(hSession, url, NULL, 0, INTERNET_FLAG_DONT_CACHE, 0);
        if (hHttp != NULL)
        {
            wprintf_s(_T("%s\n"), url);
            BYTE Temp[MAXSIZE];
            ULONG Number = 1;
            while (Number > 0)
            {
                InternetReadFile(hHttp, Temp, MAXSIZE - 1, &Number);
                Temp[Number] = '\0';
                printf("%s", Temp);
            }
            InternetCloseHandle(hHttp);
            hHttp = NULL;
        }
        InternetCloseHandle(hSession);
        hSession = NULL;
    } 

}

例子2：winsock

#include <winsock2.h>
#include<windows.h>
#include<stdio.h>
#pragma comment(lib, "ws2_32.lib")


int main(int argc, char* argv[])
{
char server_name[256]= "www.163.com";


WSADATA wsaData;
struct sockaddr_insrv_addr;


if (WSAStartup(0x202,&wsaData) == SOCKET_ERROR) {
WSACleanup();
return -1;
}


SOCKET cli_sock=socket(PF_INET,SOCK_STREAM,0);
if (cli_sock==INVALID_SOCKET)
return -1;


// connect to server


srv_addr.sin_family = AF_INET;
LPHOSTENT lphost = gethostbyname(server_name);
if (lphost != NULL)
srv_addr.sin_addr.s_addr = ((LPIN_ADDR)lphost->h_addr)->s_addr;
srv_addr.sin_port= ntohs(80);
if (connect(cli_sock,(LPSOCKADDR)&srv_addr,sizeof(srv_addr))==SOCKET_ERROR){
return -1;
}


char sz[]="GET / HTTP/1.1\r\nHost:www.163.com\r\n\r\n";
int retval = send(cli_sock,sz,sizeof(sz)-1,0);
if( SOCKET_ERROR == retval )
return 0;
char buffer[1024]={0};
while( SOCKET_ERROR != retval ){
retval = recv(cli_sock ,buffer,1000,0);
printf("%s\n",buffer);
}
closesocket(cli_sock);
return 0;
}