Re: Help - General Exception handling in vc++
Did you read on those keywords? Note you can't mix
C and C++ exception handlers. And the routine that
uses C exception handlers should not define any class
instances (destructors are not honored).
Your C handler looks like:
__try {
function_that_might_crash();
} __except (exception_filter_function()) {
/* Exception handling code */
} _finally {
/* Cleanup code - executes always, even if no exception is thrown */
/* Think of this as the C equivalent of a destructor */
}
Read the docs on __except for what your filter function
should return. Note that the __finally section is optional.
Finally, C exception handling can rarely help you in a
C++ program. If you get a structured exception that means
there's something wrong in your program and catching
the exception usually simply postpones the inevitable
crash. Your best recourse is to cleanup, save any user
data that you are fairly certain isn't corrupted (the user
would hate it if you stored corrupt data that causes any
subsequent reruns of your program to also crash!) and
then exit the process. Also note that when the structured
exception is thrown, no C++ destructors for objects on
the stack in nested functions were executed, so you most
likely incurred memory and/or resource leaks. Continuing
may even lead to a deadlock if mutexes were left locked.
--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@mvps.org
MVP VC FAQ: http://vcfaq.mvps.org
=====================================
"Nicol" <Nicol@discussions.microsoft.com> wrote in message
news:188C7E88-9288-4B7C-8540-C6F6094AE59F@microsoft.com...
could u plz tell me how to handle C structured exception(Access
violations),
i am getting this sometimes... plz give me an example how to club these 2.
shall i say like
try
{
//all my code
}
catch(...)
{
//To catch c++ exceptions
}
__except
{
}
---finally
{
}
tx in advance
"Alexander Nickolov" wrote:
Not sure if it is correct - are you throwing any C++
exceptions? If you do, do you also set the Win32 error
code for them? Makes no sense to me overall...
Note that this won't catch non-C++ exceptions, for
example access vilation exceptions, deletion by zero,
etc. These are handled via C structured exception
handlers. See __try, __except, __finally
--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@mvps.org
MVP VC FAQ: http://vcfaq.mvps.org
=====================================
"Nicol" <Nicol@discussions.microsoft.com> wrote in message
news:A9473057-9FAD-48FE-B49A-80C54BBD64CE@microsoft.com...
Hi,
How to handle general exception in vc++?
This is the VC++ ATL project which i openend in vc++.net.
I am using like
catch(...)
{
DWORD dw = GetLastError();
char excMsg[80];
ltoa(dw, excMsg, 10);
LogMsg(excMsg);
}
Is the above correct?
will it give any problem at runtime?
will it catch all type of errors?
I am getting some error when i referred this dll in .net. but it is not
logged as i mentioned in my catch to do..
Help me..
Tx in advance.