Try-catch works with structured exception

01-22-08, 11:13 AM

George George

Hello everyone,

I have tested try-catch works with structured exception, to my surprise. Previously I think we have to use __try and __except.

Any comments? Here is my test code and I am using Visual Studio 2008.

[Code]
#include <iostream>

using namespace std;

int main()
{
int* address = NULL;

try{

(*address) = 1024;
} catch (...)
{
cout << "access violation caught" << endl;
}
return 0;
}
[/Code]

thanks in advance,
George

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01-22-08, 12:46 PM

Kerem Gümrükcü

Hi George,

>Any comments?

first at all: This is NOT a Newsgroup for discussions about language
and language concepts.

>[Code]
>#include <iostream>

>using namespace std;

>int main()
{
>int* address = NULL;

>try{

>(*address) = 1024;
>} catch (...)
>{
>cout << "access violation caught" << endl;
>}
>return 0;
>}
>[/Code]

What you use here is not SEH, it is C++ exception handling, though they
internally map to SEH (i think Volodymyr said that already somewhere here)!
Read the documents carefully before you post anything!

By the way: You ask questions for anything that is answered already
in the MSDN Library or in some newsgroups. First do a extensive search
and after being not able to find something, then ask and not everything that
is unclear to you. There are beginner NG's tailored for your questions and
there are lots of them out there. Try to ask your questions there, because
it
is more obvious to get a answer there than here.

Regards

Kerem

01-22-08, 03:03 PM

Ben Voigt [C++ MVP]

<George George> wrote in message
news:emic
> Hello everyone,
>> I have tested try-catch works with structured exception, to my surprise.
> Previously I think we have to use __try and __except.
>
> Any comments? Here is my test code and I am using Visual Studio 2008.

You're in the realm of needing to list the compile command line.

catch(...) will be an SEH when compiling with /EHa, but not with /EHsc
[..]

01-22-08, 03:12 PM

Volodymyr Shcherbyna

> You're in the realm of needing to list the compile command line.
>
> catch(...) will be an SEH when compiling with /EHa, but not with /EHsc

And by default, VS2008 uses /EHsc, so George's code should fail with access
violation.

01-24-08, 09:23 AM

Roberto Baggio

With VS2003, the only exception handling options from the integrated
environment for /EHz and "none". Using /EHz, the default, catches both C++
and SEH.

In VS2005 (and 2008), the behavior is different as that compiler setting
doesn't catch SEH. It also gives the option of /EHz in the integrated
environment, which will catch both types of exceptions.

Minor pain in the butt.

"Volodymyr Shcherbyna" <v_scherbina> wrote in message
news:1132
[..]

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