[DGD]Calling CPP Functions from an Extension

[Michael J. Bacon]

	Hello all!  My apologies if this has been asked and answered in the past I
am relatively new to the list and still trying to figure out the best way to
go through the archive files in a logical manner.

	Anyway, I've been playing around with dgd1.2's extension capabilities.
Very neat I must say.  For convoluted reasons I find myself needing to call
C++ functions from an extension.  I realize I will be unable to directly
access class objects or advanced C++ constructs from an extension, but I
have devised a few functions which, in theory, should act as a layer between
the C++ objects and methods and the procedural C calls any extension would
make.  I wrote a simple extension to test this theory, and I'm glad I did,
because I can't get things to link.

	I am trying to do this on WinNT using Visual C++ 6.0.  I am trying to link
in a very simple CPP file which at the moment does nothing except declare a
string variable...  It looks like this:

------
#define TESTHR(x) if FAILED(x) _com_issue_error(hr)

// Function declarations
int OpenX(void);

///////////////////////////////////////////////////////////
//                                                       //
//               OpenX Function                          //
//                                                       //
///////////////////////////////////////////////////////////

int OpenX(void)
{

    _bstr_t strCnn("Provider=sqloledb;Data Source=MyServer;"
        "Initial Catalog=pubs;User Id=sa;Password=;");


	return 0;

}
------

Compiles fine, but when I link I get the following errors:

Microsoft (R) Program Maintenance Utility   Version 6.00.8168.0
Copyright (C) Microsoft Corp 1988-1998. All rights reserved.

No configuration specified.  Defaulting to windgd - Win32 Debug.
        link.exe @C:\WINDOWS\TEMP\nma00163.
nafxcwd.lib(afxmem.obj) : error LNK2005: "void * __cdecl operator
new(unsigned i
nt)" (??2 at YAPAXI@Z) already defined in LIBCMTD.lib(new.obj)
nafxcwd.lib(afxmem.obj) : error LNK2005: "void __cdecl operator delete(void
*)"
(??3 at YAXPAX@Z) already defined in LIBCMTD.lib(dbgdel.obj)
.\Debug/dgd.exe : fatal error LNK1169: one or more multiply defined symbols
foun
d
NMAKE : fatal error U1077: 'D:\PROGRA~1\MICROS~1\VC98\BIN\link.exe' : return
cod
e '0x491'
Stop.


	Any ideas what I am doing wrong?  I haven't modified windgd.mak at all
except to add the cpp file to the dependency and to link it in...

	Thanks in advance for any advice...


Michael.


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