Re: Any problems expected in Multiple inheritance with template class ?

From:

"Ganga Sridhar" <gangasridhar@abosoftware.com>

Newsgroups:

microsoft.public.vc.language

Date:

Fri, 11 Jul 2008 00:06:45 +0530

Message-ID:

<ejFxqvr4IHA.2072@TK2MSFTNGP04.phx.gbl>

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Sorry for the incomplete mail:

I have my derived class

CABIOleDbSet : public CCommand<TAccessor, TRowset>, public CABISet

{
....
}

In CABISet I have a function like this

class CABISet

{

..........

virtual void Open(const string& strSQL) = 0;

}

HRESULT CABIOleDbSet::OpenWithException(CABIOleDbSession& session, const =
string& strCmd, DBPROPSET *pPropSet)

{

if(session.IsOpen()==false)

{

ostringstream ost;

ost << "Session is not opened. Can'nt execute command [" << strCmd << =
"]";

throw CMyException(CONNECTION_ERROR, ost.str(), __FILE__, __LINE__);

}

wstring wstrCmd = StrToWstr(strCmd);

HRESULT hr = S_FALSE;

try

{

hr =CCommand::Open(*m_pSession, wstrCmd.c_str(), pPropSet);//CRASHES =
here

}

catch(...)

{

ASSERT(false);

}

return hr;

}

Any idea why?

Thanks and Regards

Ganga

"Igor Tandetnik" <itandetnik@mvps.org> wrote in message =
news:O6FGn0q4IHA.3484@TK2MSFTNGP05.phx.gbl...

"Ganga Sridhar" <gangasridhar@abosoftware.com> wrote in message
news:egVe9lp4IHA.5060@TK2MSFTNGP02.phx.gbl

When I use multiple inheritance i.e derived class CABIOleDBSet from
CCommand and CTest program crashes.

Crashes when doing what? I seem to have misplaced by crysal ball.
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to =

land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925

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charset=iso-8859-1">
<META content="MSHTML 6.00.6000.16674" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY>
<DIV>
Sorry for the incomplete mail:
I have my derived class

CABIOleDbSet : public
CCommand<TAccessor, TRowset>, public
CABISet { ... } 
In CABISet I have a function like this

class CABISet 
{
.........
virtual void Open(const string& strSQL) = =
0;
}
HRESULT
CABIOleDbSet::OpenWithException(CABIOleDbSession& session, const =
string&
strCmd, DBPROPSET *pPropSet)
{
if(session.IsOpen()==false)
{
ostringstream ost; 
ost << "Session is not opened. =
Can'nt execute
command [" << strCmd << "]";
throw CMyException(CONNECTION_ERROR, =
ost.str(),
__FILE__, __LINE__);
}
wstring wstrCmd = =
StrToWstr(strCmd);
HRESULT hr = S_FALSE;

try
{
hr =CCommand::Open(*m_pSession, =

wstrCmd.c_str(), pPropSet);//CRASHES here
}
catch(...)
{
ASSERT(false);
}
return hr;
}
Any idea why?
Thanks and Regards
Ganga</DIV>
<DIV>"Igor Tandetnik" <<A
href="mailto:itandetnik@mvps.org">itandetnik@mvps.org</A>> =
wrote in
message <A =
href="news:O6FGn0q4IHA.3484@TK2MSFTNGP05.phx.gbl">news:O6FGn0q4IHA.3484@TK2MSFTNGP05.phx.gbl</A>...</DIV>> =
"Ganga Sridhar"
<<A href="mailto:gangasridhar@abosoftware.com">gangasridhar@abosoftware.com</A>> wrote
in message > <A
href="news:egVe9lp4IHA.5060@TK2MSFTNGP02.phx.gbl">news:egVe9lp4IHA.5060@TK2MSFTNGP02.phx.gbl</A> >> When I use multiple inheritance i.e derived class =
CABIOleDBSet
from >> CCommand and CTest program crashes. > > =
Crashes
when doing what? I seem to have misplaced by crysal ball. > -- =
 >
With best wishes, >    Igor Tandetnik > =
 > With
sufficient thrust, pigs fly just fine. However, this is not > =
necessarily
a good idea. It is hard to be sure where they are going to > =
land, and it
could be dangerous sitting under them as they fly > overhead. -- =
RFC 1925
 > ></BODY></HTML>

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