Q231578: FIX: Hosting a WebBrowser Control in an MFC Container ASSERTs

Article: Q231578
Product(s): Microsoft C Compiler
Version(s): 5.0
Operating System(s): 
Keyword(s): kbActiveX kbCOMt kbContainer kbCtrl kbMFC kbVC500 kbVC500bug kbVC600bug kbWebBrowser kb
Last Modified: 13-FEB-2002

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The information in this article applies to:

- The Microsoft Foundation Classes (MFC), used with:
   - Microsoft Visual C++, 32-bit Enterprise Edition, version 5.0 
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SYMPTOMS
========

Take a CHtmlView based application or have a dialog hosting a web browser
control. Go to a local folder. Right-click and select either New Folder or one
of the file types listed there. It will ASSERT in WinOcc.cpp, Line 331. This
does not have any impact on the release build.

CAUSE
=====

This is due to a bug in MFC for UI activation of an ActiveX control.

RESOLUTION
==========

Override the PreTranslateMessage function in the dialog class or the one derived
from CHtmlView. If the message is WM_RBUTTONDOWN, return 0. The code should look
like this:

  BOOL CMyDialog::PreTranslateMessage(MSG* pMsg) 
  {
  	if (pMsg->message == WM_RBUTTONDOWN)
  		return 0;

  	return CDialog::PreTranslateMessage(pMsg);
  }

This eliminates the possibility of having a context menu for the container.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article.

This problem was corrected in Visual C++ 6.0.

MORE INFORMATION
================

Steps to Reproduce Behavior
---------------------------

1. Generate an AppWizard application and select CHtmlView class as the base
  class of your view class in Step 6 of the AppWizard.

2. Provide a valid path to one of the local folders. Modify the OnInitialUpdate
  of the view class as shown below:

  void CMyHTMLView::OnInitialUpdate()
  {
  	CHtmlView::OnInitialUpdate();

  	Navigate2(_T("C:\\Temp"),NULL,NULL);
  }

3. Build the EXE and run it.

4. Right-click inside the view and select New Folder.

Additional query words: CHtmlView

======================================================================
Keywords          : kbActiveX kbCOMt kbContainer kbCtrl kbMFC kbVC500 kbVC500bug kbVC600bug kbWebBrowser kbGrpDSMFCATL kbNoUpdate 
Technology        : kbAudDeveloper kbMFC
Version           : :5.0
Issue type        : kbbug
Solution Type     : kbfix

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