Mysterious Class Wizard warning message

Jon Meltzer/HHP/International Thomson Publishing
Sunday, June 09, 1996

Platform:  Windows 95/ Environment:  VC++ 1.52, MFC 2.5  (but I get the same 
error using VC++ 4.1)

Excuse the following if it is a naive question, but I'm stumped: 

I'm trying to use the VC++ 1.52 Class Wizard (development platform: Windows 95) 
to create a new derived class. I create my dialog in AppStudio, click on the 
ClassWizard, get the "select class" dialog, select the class I want to derive 
the new one from, and get the message:

"A duplicate insert block was found for class CConjView in the source files 
(conjview.h, conjview.cpp)".

Now, the conjview.* files were written by another programmer, who is currently 
not available. But the files compile OK.  (CConjView is derived from CFormView, 
and I don't see any problems in how it is created.)

I tried rebuilding the .CLW file. No luck.

My questions are:

- what does the message mean, 
- are the ClassWizard warning messages documented;  (I've looked in the help, 
the printed books, and the knowledge base), and
- what should I be looking for in the code so that I can fix things and get the 
wiz to accept a new derived class?

I'd appreciate any help, and would be happy to send the offending code if 
necessary.

Thanks,

Jon Meltzer
Heinle & Heinle/ITP 



 

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Alex Sevugan -- asevugan@csci.csc.com
Monday, June 10, 1996

[Mini-digest: 3 responses]

Hi Jon,

Could you send the offending code. I think I might be able to help.

Alaks

-----From: Amir Salzberg 

Maby you should delete the previous conjview.* files or at list rename them

-----From: George Voronoff 

I'm just shooting from the hip here but you might have a look at the Dialog
Constructors.
Class wizard provies a default constructor that initializes any member
variables that
were created via class wizard:

        //{{AFX_DATA_INIT(CConjView)
        m_foo = 0.0
        m_bar = 9.9
        //}}AFX_DATA_INIT

If there is more than one constructor, and this code appears in each, Class
Wizard Barfs.
The workaround is to put the init data into a subroutine and call this
subroutine
from both constructors.

good luck

---

Les.L.J.Benson@lee0101.wins.icl.co.uk
Tuesday, June 11, 1996

[Mini-digest: 4 responses]

Have you checked to see if the CLW blocks are duplicated i.e the
lines that read //{{AFX_MSG_MAP(CMyClass) to //}}AFX_MSG_MAP
in the .cpp and between //{{AFX_MSG(CMyClass) thru //}}AFX_MSG
in the .h
These are the place markers for Classwizard, so these could be
duplicated.   Rgds Les Benson
-----From: Anthony Garrigan 

I have had similar messages generated when duplicate class declarations 
have been made in either the *h or *.cpp files. In the situations that it 
has happened I cannot fully remember and I donot know why the compiler did 
not complain. Anyway this is worth checking out. The class wizard parses 
the files and if any duplication are made an error is generated.

I hope this helps

>  > > > 

-----From: Terry Trippany 

Hi,

>"A duplicate insert block was found for class CConjView in the source files 
>(conjview.h, conjview.cpp)".

It should compile OK because the class wizard is parsing comments to read in
it's database information.  You should look in the header file for one of
the following duplicate blocks

//{{AFX_MSG(CMainFrame)

//}}AFX_MSG

 or

//{{AFX_VIRTUAL(CMainFrame)

//}}AFX_VIRTUAL

Try looking up MFC Message Maps in something like the InfoViewer or MSDN for
more info.

Hope this helps.

Terry Trippany

terryt@str.com
Senior Consultant
Strategic Technology Resources
Chicago, IL

-----From: Jon Meltzer/HHP/International Thomson Publishing

I tried George Voronoff's fix, and it worked. So now I know what the ClassWiz 
defines an "insert block" as ...

I wish the term was indexed somewhere in the help and documentation, though.

Thanks for the help.

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