用CInternetSession下载文件

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用CInternetSession下载文件

江湖 C/C++ 2018-11-7 1191 0评论

bool InternetDownload(const CString &strURL, const CString &strFN)
...{

    CInternetSession internetSession("SecurityScan.exe",0);
    //第一个参数不能为空

    BOOL bSucceed = TRUE;

    try
    ...{
        CStdioFile * pFile = internetSession.OpenURL(strURL);

        if(pFile != NULL)
        ...{

            CFile cf;
            if(!cf.Open(strFN, CFile::modeCreate | CFile::modeWrite, NULL))
            ...{
                return FALSE;
            }

            BYTE Buffer[512];

            ZeroMemory(Buffer, sizeof(Buffer));
            int nReadLen = 0;

            while((nReadLen = pFile->Read(Buffer, sizeof(Buffer))) > 0)
            ...{
                cf.Write(Buffer, nReadLen);
            }

            cf.Close();
            pFile->Close() ;

            delete pFile;

        }
    }
    catch (CInternetException& e)
    ...{
        char szBuffer[128];
        ZeroMemory(szBuffer, sizeof(szBuffer));
        e.GetErrorMessage(szBuffer, sizeof(szBuffer), NULL);
        TRACE("InternetDownload, Exception: %s ",szBuffer);
    }
    catch(...)
    ...{
        TRACE("InternetDownload, Exception: ... ");
    }
    internetSession.Close() ;

    if(!bSucceed)
        DeleteFile(strFN);
    return bSucceed;
}

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