FIX: ISAPI Extension Wizard Generates Bad OnAuthentication

ID: Q152493

The information in this article applies to:

The AppWizard, included with:
- Microsoft Visual C++, 32-bit Editions, version 4.1

SYMPTOMS

Generating an ISAPI Filter using the MFC ISAPI Extension Wizard and selecting the option "Client Authentication Requests," will generate an ISAPI Filter DLL with an OnAuthentication() member function that will never be called.

CAUSE

When generating an ISAPI Filter using the MFC ISAPI Extension Wizard, if the "Client Authentication Requests" checkbox is selected on the second page of the Wizard, the function generated, OnAuthentication(), will have an improper type as one of its parameters. Therefore, it will not override the virtual function in the base class.

RESOLUTION

Modify the definition and implementation of the OnAuthentication function so the second parameter is of type PHTTP_FILTER_AUTHENT rather than type PHTTP_FILTER_PREPROC_HEADERS.

The definition of the OnAuthentication function will look like the following in the .H file:


   DWORD OnAuthentication(CHttpFilterContext* pCtxt,
       PHTTP_FILTER_PREPROC_HEADERS pHeaderInfo);

and like the following in the .CPP file:


   DWORD CMyFilter::OnAuthentication(CHttpFilterContext* pCtxt,
       PHTTP_FILTER_PREPROC_HEADERS pHeaderInfo)

The second parameter should not be PHTTP_FILTER_PREPROC_HEADERS, but should read PHTTP_FILTER_AUTHENT. For example:


   DWORD OnAuthentication(CHttpFilterContext* pCtxt,
       PHTTP_FILTER_AUTHENT pHeaderInfo);

in the .H file, and:


   DWORD CMyFilter::OnAuthentication(CHttpFilterContext* pCtxt,
       PHTTP_FILTER_AUTHENT pHeaderInfo)

in the .CPP file.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug was fixed in Visual C++ 32-bit Edition version 4.2.

Additional query words:

Keywords : kbprg kbISAPI kbMFC kbVC kbVC410bug kbVC420fix iisapi
Version : winnt:
Platform : winnt
Issue type : kbbug