VC获取网页源码的三种方式

//有三种方法
'方法一(只适用于MFC工程)：
//参数URL：网页地址
//返回CString就是网页源码
//返回的网页源码是UTF8格式,要转成ANSI等编码才能正常显示
#include <afxinet.h>
CString GetWebSource(CString URL)
{
    CInternetSession Session(NULL,0);
    CString PageData;
    CString TempData;
    CHttpFile*HttpFile=(CHttpFile*)Session.OpenURL(URL);
    while(HttpFile->ReadString(TempData))
    {
        PageData+=TempData;
    }
    HttpFile->Close();
    delete HttpFile;
    Session.Close();
    //这里返回的网页源码是UTF8格式,要转成ANSI等编码才能正常显示
    return PageData;
}
'方法二：
首先引用:
#import <msxml4.dll> named_guids
using namespace MSXML2;
CString resaa;
IXMLHTTPRequestPtr httpRes;
HRESULT hr=httpRes.CreateInstance("MSXML2.XMLHTTP");
if(!SUCCEEDED(hr))
{
  AfxMessageBox("无法创建XMLHTTP对象，请检查是否安装了MS XML运行库!");
}
LPCTSTR url="http://localhost/changjun/asxml.asp";
httpRes->open("Get",url,false,"","");
httpRes->send();
if((httpRes->readyState)==4) //4时表示数据已加载完
{
  resaa=httpRes->responseText.copy();
}
httpRes.Release();
//到这里,再把UTF8转成char就可以正常显示网页源码了

'方法三：
#include <wininet.h>
#pragma comment(lib, "wininet.lib")
char* GetWebPage(char*URL)
{
    HINTERNET Session = InternetOpen(NULL,INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,NULL);
    if (NULL == Session)
    {
        InternetCloseHandle(Session);
        return FALSE;
    }
    HINTERNET hHttpFile =InternetOpenUrl(Session,URL,NULL,NULL,INTERNET_FLAG_NO_CACHE_WRITE,NULL);
    if (NULL == hHttpFile)
     {
        InternetCloseHandle(hHttpFile);
        InternetCloseHandle(Session);
        return FALSE;
     }
    char szSizeBuffer[32];
    DWORD dwLengthSizeBuffer = sizeof(szSizeBuffer);
    DWORD dwFileSize=10*1024;
    if(::HttpQueryInfo(hHttpFile,5, szSizeBuffer,&dwLengthSizeBuffer,NULL)==TRUE)
    {
        // allocating the memory space for http file contents
        dwFileSize=atol(szSizeBuffer);
    }

    PBYTE pBuf = new BYTE[dwFileSize*sizeof(TCHAR)];
    if (NULL == pBuf)
     {
        InternetCloseHandle(hHttpFile);
        InternetCloseHandle(Session);
        return FALSE;
     }
    DWORD dwReadDataLength = NULL;
    BOOL bRet = TRUE;
    do 
    {
        //ZeroMemory(pBuf,dwMaxDataLength*sizeof(TCHAR));
        bRet = InternetReadFile(hHttpFile,pBuf,dwFileSize,&dwReadDataLength);
     } while (NULL != dwReadDataLength);
    return (char*)pBuf; 
}