Re: Try Catch Finally in MFC

From:

David Wilkinson <no-reply@effisols.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Sun, 22 Jul 2007 08:11:44 -0400

Message-ID:

<esyrnlFzHHA.4824@TK2MSFTNGP02.phx.gbl>

slg wrote:

Iam using latest MFC Version, i believe 7.0. I could only find TRY
CATCH block in MFC.
How can i implement try -catch- finally in MFC?

One thought i have is to throw an exception while iam in try block when
i want to return.
Is this a good idea?

TRY{

//When i want to return due to improperly formatted parameter to the
function, i will throw a custom exception.
THROW();

}CATCH(Exception,e)
{
}

slg:

Not sure I fully understand the question.

Firstly, the use of MFC TRY/CATCH is no longer necessary -- use standard
try/catch instead (I think they are actually the same in later versions
of VC).

Second, if you use the C++ RAII idiom, "finally" is not needed (which is
just as well, as standard C++ has no such construct). With proper use of
RAII classes, you can return or throw an exception from anywhere in your
function without leaking resources.

Third, the routine use of "catch" in the same function as the "throw" is
a misuse of the try/throw mechanism, whose purpose is to separate error
handling from error generation.

--
David Wilkinson
Visual C++ MVP