Getting the exception code from a structured exception in a catch (...) block

10-26-03, 12:18 AM

Douglas Peterson

In my program I'm throwing C++ exceptions all around and need to catch
structured exceptions and re-throw them as C++ exceptions.
I've managed to do it, but it's a bit ugly:

static DWORD _nExceptionCode;

int handler(DWORD code)
{
_nExceptionCode = code;
return EXCEPTION_CONTINUE_SEARCH;
}

void CatchRun()
{
__try { Run(); }
__except (handler(GetExceptionCode())) { }
}

now I can ...

try { CatchRun(); }
catch (...) { throw new FaultStructured(_nExceptionCode); }

Is there a 'cleaner' way?
Since a catch (...) block does catch structured exceptions, it seems to me
there should be a catch (StructuredException& ex) syntax (or some such) that
I'm not seeing documented.

10-26-03, 01:30 AM

Kirk Ferdmann

"Douglas Peterson" <Tergiver> wrote in message
news:2416
> In my program I'm throwing C++ exceptions all around and need to catch
> structured exceptions and re-throw them as C++ exceptions.

Consider _set_se_translator. The translating function shall be installed on
per thread basis. Also note that if you catch SEH exception with __except
it's not necessarily true that destructors for automatic objects have been
called. Consider compiler's documentation on /EH -

<quote>
However, some of the unwindable objects in the function where the exception
occurs may not get unwound, if the compiler judges their lifetime tracking
mechanics to be unnecessary for the synchronous model
</quote>

In plain English that means that you have to use /EHa if you plan to catch
exceptions with __except and treat them as non fatal.

-Kirk

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