ftp 下载时防止从缓存中获取文件

//http://baike.baidu.com/link?url=QucJiA_Fg_-rJI9D4G4Z4687HG4CfhtmBUd5TlXrcWCeIEXCZxIh0TD7ng1wROAzAuGD8qncM65XK4BZ1K1uqq 

int CFTP_MFC_TESTDlg::FTP_DownLoadFile(char *FtpIp, char *User, char *Password, char *FtpPath, char *FileName, char *DownLoadPath)
{
HINTERNET hInternet;
    HINTERNET hConnect;

BOOL bRes;
    
hInternet = InternetOpen("A3GS Sample",
INTERNET_OPEN_TYPE_DIRECT,
NULL,
NULL,
INTERNET_FLAG_NO_CACHE_WRITE);

    if ( NULL == hInternet )
    {
        return -1;
    }

    hConnect  = InternetConnect(hInternet,
        FtpIp,
        INTERNET_DEFAULT_FTP_PORT,
        User,
        Password,
        INTERNET_SERVICE_FTP,
        INTERNET_FLAG_EXISTING_CONNECT || INTERNET_FLAG_PASSIVE,
        0 );

     if ( NULL == hInternet )
     {
         InternetCloseHandle(hInternet);
         return -2;
     }

//设置ftp的文件所在的文件夹，这样才能正常下载
    FtpSetCurrentDirectory(hConnect, FtpPath);

    bRes = FtpGetFile(hConnect,FileName,DownLoadPath,FALSE,FILE_ATTRIBUTE_ARCHIVE,FTP_TRANSFER_TYPE_UNKNOWN | INTERNET_FLAG_RELOAD,0);//INTERNET_FLAG_RELOAD 强制重读数据

InternetCloseHandle(hConnect);
    InternetCloseHandle(hInternet);

if( bRes )
return 0;
else
return -3;
}