Q243173: PRB: Install VCCE Causes ATL Windows Message Handler List Empty

Article: Q243173
Product(s): Microsoft C Compiler
Version(s): 6.0
Operating System(s): 
Keyword(s): kbwizard kbATL kbVC600 kbOSWinCEsearch kbGrpDSMFCATL
Last Modified: 13-MAY-2002

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The information in this article applies to:

- Microsoft Windows CE Toolkit for Visual C++ 6.0 
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SYMPTOMS
========

After installing the Microsoft Windows CE Toolkit for Visual C++ 6.0, if you
right-click on an ATL class in the Class View pane, the "Add Windows Message
Handler" wizard always displays empty. The wizard is supposed to have a list of
windows messages and events you can select to add a handler for. On a computer
without Microsoft Windows CE Toolkit for Visual C++ 6.0, the "Add Windows
Message Handler" wizard had numerous messages/events to choose from.

CAUSE
=====

Microsoft is researching this problem and will post more information here in the
Microsoft Knowledge Base when it becomes available.

RESOLUTION
==========

At this time, there is no resolution to this problem other than uninstalling the
toolkit, and doing a clean uninstall and reinstall of Microsoft Visual C++ 6.0
or Microsoft Visual Studio 6.0. To workaround this problem, message maps can be
added manually without using any wizards. For example:

  class CMyClass : ...
  {
  public:
     ...

     BEGIN_MSG_MAP(CMyClass)
        COMMAND_HANDLER(IDC_MYCTL, EN_CHANGE, OnChange)
        MESSAGE_HANDLER(WM_PAINT, OnPaint)
        ...
     END_MSG_MAP()

     // When a CMyClass object receives a WM_COMMAND
     // message identified by IDC_MYCTL and EN_CHANGE,
     // the message is directed to CMyClass::OnChange
     // for the actual processing.
     LRESULT OnChange( ... )
     { ... }

     // When a CMyClass object receives a WM_PAINT
     // message, the message is directed to
     // CMyClass::OnPaint for the actual processing.
     LRESULT OnPaint( ... )
     { ... }
  };

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

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

1. Create a New ATL/COM AppWizard project.

2. From Menu item, choose Insert, New ATL Object... and choose the Miscellaneous
  Category and then add a Dialog object.

3. In the Class View right-click the Dialog Class and choose Add Windows Message
  Handler.

If Windows CE Toolkit for Visual C++ 6.0 is installed on the computer, you will
notice that the "New Windows messages/event" list is empty.

(c) Microsoft Corporation 1999, All Rights Reserved.
Contributions by Vidyanand Rajpathak, Microsoft Corporation


Additional query words: Message handler, command ATL, Toolkit, Windows CE

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Keywords          : kbwizard kbATL kbVC600 kbOSWinCEsearch kbGrpDSMFCATL 
Technology        : kbVCsearch kbAudDeveloper kbWinCETKVCSearch kbWinCESearch kbWinCETK600VC
Version           : :6.0
Issue type        : kbprb
Solution Type     : kbpending

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