CInternetSession類OpenURL函數異常問題

       最近在做項目過程中，用到了讀取網頁（現在以百度首頁爲例）上的數據，代碼如下：

       CInternetSession session("HttpClient");   
       char * url = "www.baidu.com";   
       CHttpFile* pfile = (CHttpFile *)session.OpenURL(url);

       在CInternetSession類OpenURL函數一直爆發異常，經查看，GetLastError報錯12006，經查閱MSDN才明白：

       CStdioFile* OpenURL( LPCTSTR pstrURL

                                                 , DWORD_PTR dwContext = 1

                                                 , DWORD dwFlags = INTERNET_FLAG_TRANSFER_ASCII

                                                 , LPCTSTR pstrHeaders = NULL

                                                 , DWORD dwHeadersLength = 0 );

        對第一個參數的解釋爲：A pointer to the name of the URL to begin reading. Only URLs beginning with file:, ftp:, gopher:, or http: are supported. ASSERTS if pszURL is NULL.

       恍然大悟，將代碼修改爲：

       CInternetSession session("HttpClient");   
       char * url = "http://www.baidu.com";   
       CHttpFile* pfile = (CHttpFile *)session.OpenURL(url);

       最終程序運行正常。