如何改变CFileDialog的默认路径

CFileDialog中有这个参数lpszFileName，指定它就可以了

explicit   CFileDialog(   
        BOOL   bOpenFileDialog,   
        LPCTSTR   lpszDefExt   =   NULL,   
        LPCTSTR   lpszFileName   =   NULL, //指定这个就行了   
        DWORD   dwFlags   =   OFN_HIDEREADONLY   |   OFN_OVERWRITEPROMPT,   
        LPCTSTR   lpszFilter   =   NULL,   
        CWnd*   pParentWnd   =   NULL,   
        DWORD   dwSize   =   sizeof(   
        OPENFILENAME   )   
  );

CFileDialog dlgFile(TRUE, NULL, "指定的目录", OFN_HIDEREADONLY, _T("(*.pfx;)|*.pfx;||"), NULL);
if (dlgFile.DoModal())
{
  ...
}