三种获取网页源码的方法(使用MFC/Socket实现)

CString GetHttpFileData(CString strUrl)
{
     CInternetSession Session("Internet Explorer", 0);
     CHttpFile *pHttpFile = NULL;
     CString strData;
     CString strClip;
     pHttpFile = (CHttpFile*)Session.OpenURL(strUrl);
    while ( pHttpFile->ReadString(strClip) )
     {
      strData += strClip;
      }
     return strData;
}

#define MAXBLOCKSIZE 1024
#include <windows.h>
#include <wininet.h>

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

void GetWebSrcCode(const char *Url);

int _tmain(int argc, _TCHAR* argv[])
{
    GetWebSrcCode("//www.jb51.net/");

    return 0;
}

void GetWebSrcCode(const char *Url)
{
    HINTERNET hSession = InternetOpen("zwt", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
    if (hSession != NULL)
    {
        HINTERNET hURL = InternetOpenUrl(hSession, Url, NULL, 0, INTERNET_FLAG_DONT_CACHE, 0);
        if (hURL != NULL)
        {
            char Temp[MAXBLOCKSIZE] = {0};
            ULONG Number = 1;

            FILE *stream;
            if( (stream = fopen( "E:\\test.html", "wb" )) != NULL )
            {
                while (Number > 0)
                {
                    InternetReadFile(hURL, Temp, MAXBLOCKSIZE - 1, &Number);
                    fwrite(Temp, sizeof (char), Number , stream);
                }
                fclose( stream );
            }

            InternetCloseHandle(hURL);
            hURL = NULL;
        }

        InternetCloseHandle(hSession);
        hSession = NULL;
    }
}

int main(int argc, char* argv[])
{
    SOCKET hsocket;
    SOCKADDR_IN saServer;
    WSADATA wsadata;
    LPHOSTENT lphostent;
    int nRet;
    char Dest[3000]; 
    char* host_name="blog.sina.com.cn";
    char* req="GET /s/blog_44acab2f01016gz3.html HTTP/1.1\r\n"
        "User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET4.0C; .NET4.0E; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)\r\n"
        "Host:blog.sina.com.cn\r\n\r\n";

    // 初始化套接字 
    if(WSAStartup(MAKEWORD(2,2),&wsadata))
        printf("初始化SOCKET出错！");
    lphostent=gethostbyname(host_name);  
    if(lphostent==NULL)  
        printf("lphostent为空！");  
    hsocket = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);  
    saServer.sin_family = AF_INET;  
    saServer.sin_port = htons(80);  
    saServer.sin_addr =*((LPIN_ADDR)*lphostent->h_addr_list);  
    // 利用SOCKET连接  
    nRet = connect(hsocket,(LPSOCKADDR)&saServer,sizeof(SOCKADDR_IN));  
    if(nRet == SOCKET_ERROR)  
    {
        printf("建立连接时出错！");  
        closesocket(hsocket);
        return 0;
    }
    // 利用SOCKET发送  

    nRet = send(hsocket,req,strlen(req),0);  
    if(nRet==SOCKET_ERROR)  
    {  
        printf("发送数据包时出错！");  
        closesocket(hsocket);  
    }  
    nRet=1;  
    while(nRet>0)  
    {  
        // 接收返回数据包  
        nRet=recv(hsocket,(LPSTR)Dest,sizeof(Dest),0);  
        if(nRet>0)
            Dest[nRet]=0;
        else  
            Dest[0]=0; 
        char sDest[3000] = {0};
        UTF8_2_GB2312(sDest,nRet,Dest,nRet);
        // 显示返回数据包的大小、内容 
        //printf("\nReceived bytes:%d\n",nRet);  
        printf("Result:\n%s",sDest);  
    }
}

void UTF_8ToUnicode(wchar_t* pOut,char *pText)
{  
    char* uchar = (char *)pOut;
    uchar[1] = ((pText[0] & 0x0F) << 4) + ((pText[1] >> 2) & 0x0F);
    uchar[0] = ((pText[1] & 0x03) << 6) + (pText[2] & 0x3F);
}
void Gb2312ToUnicode(wchar_t* pOut,char *gbBuffer)
{  
    ::MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,gbBuffer,2,pOut,1);
}
void UTF_8ToGB2312(char*pOut, char *pText, int pLen) 
{  
    char Ctemp[4];  
    memset(Ctemp,0,4);
    int i =0 ,j = 0;
    while(i < pLen)
    { 
        if(pText[i] >= 0) 
        { 
            pOut[j++] = pText[i++];
        }
        else
        { 
            WCHAR Wtemp;
            UTF_8ToUnicode(&Wtemp,pText + i);
            UnicodeToGB2312(Ctemp,Wtemp);
            pOut[j] = Ctemp[0];
            pOut[j + 1] = Ctemp[1]; 
            i += 3;  
            j += 2; 
        }  
    }
    pOut[j] ='\n';
    return;
}