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<FONT COLOR="#AOAO99">Displaying System Interfaces in ClassView</FONT></H3></CENTER>

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<P>This article was contributed by <A HREF="mailto:extraview@netmatters.co.uk">James Hebben</A></P>

<P>The VC++ ClassView pane of the project window displays a view of your
project classes. If your project is an ATL project, then ClassView will also
display your interfaces that a class supports when the class node is opened in
ClassView. ClassView scans your class header file for <B>COM_INTERFACE_ENTRY
</B>macros to determine what interfaces a class supports. By default, only
interfaces that appear in your IDL file are displayed in the ClassView. </P>
<P>You can extend this feature to include any system interfaces that you
implement in your class, such as <B>IStorage</B>, <B>IStream</B> etc. This can
be acieved in two simple steps:</P>

<OL>
<LI>Ensure that your class declaration includes <B>COM_INTERFACE_ENTRY </B>macros
for the system interfaces you implement (it should do already)</LI>
<LI>Open the system IDL file (in the main Include directory of your VC++
installation) that contains the interface you want ClassView to recognise and
include it in your project</LI></OL>

<P>All system interfaces that are defined all IDL files that are included in
your project will appear in the ClassView window.</P>

<P><B>NOTE:</B> By default, adding an IDL file to your project excludes it from
the project build so this method does not affect the  build of your project in
any way</P>



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