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Q116017: PRB: ClassWizard Doesn’t Support Custom Foreign DDX

Article: Q116017
Product(s): Microsoft C Compiler
Version(s): winnt:
Operating System(s): 
Keyword(s): kbwizard kbDatabase kbMFC kbVC150 kbVC200 kbVC400 kbClassWizard kbGrpDSMFCATL
Last Modified: 07-MAY-2001

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The information in this article applies to:

- The ClassWizard, used with:
   - Microsoft Visual C++, versions 1.5, 1.51, 1.52 
   - Microsoft Visual C++ 32-bit Edition, versions 1.0, 2.0, 2.1, 4.0 
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SYMPTOMS
========

ClassWizard does not allow custom DDX functions for foreign variables.

Custom DDX functions can be implemented by the user and then used by ClassWizard
in generating code for member variables. The technique for this is described in
"MFC TechNote 26."

If, however, you have created a custom DDX function that is intended to be used
to exchange data between a control and a foreign member variable (see "foreign"
in the online help), ClassWizard will not recognize that your function is
intended for foreign variables, nor will it let you select your new property or
type (defined in the "ExtraDDX?" line in the APPSTUDIO.INI file) in conjunction
with a foreign variable.

CAUSE
=====

This is a limitation in all versions listed above of Microsoft Visual C++.

RESOLUTION
==========

To work around this, manually add your custom DDX_Field* call to your
CRecordView's DoDataExchange() function.

Additional query words: 1.00 1.50 1.51 1.52 2.00 2.10 4.00 DDX_Proc DDXExtra

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Keywords          : kbwizard kbDatabase kbMFC kbVC150 kbVC200 kbVC400 kbClassWizard kbGrpDSMFCATL 
Technology        : kbVCsearch kbAudDeveloper kbClassWizard
Version           : winnt:
Issue type        : kbprb

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