How to catch unhanded exception ?

Anticross

I've got QCoreApplication. I run it at Microsoft Windows OS and need to catch unhanded exception. I try to do this:
@try{
m_defMail.setDefault();
#ifdef _DEBUG
m_defMail.setDebugDefault();
#endif

// int g = 0;
// int t = g/g;

initPathes();
initArgs();
analyseArguments(argc, argv);
sendAllMessages();
}
catch (...){
qDebug() << "sxMailSender: Unhanded Exception!!! Application will be terminated.";
}--@
but it's have no effect.

Edit: moved to C++, as it is no Qt related topic. Gerolf

giesbert

which exception do you try to catch?
There are two types:

"normal" exception (by throw) which can be caught by try/catch
structured exceptions (like div 0, null pointer, etc.) which can't be catched by try/catch. For those you need try/except which is not possible in functions using C++ objects :-( Then you need an exception translator (_set_se_translator). There you can convert the structured exception into a C++ exception and throw that one. But sorry,. I can't give you code for that, as it is closed source what I do here.

Anticross

@try{
m_defMail.setDefault();
#ifdef _DEBUG
m_defMail.setDebugDefault();
#endif

int g = 0;
int t = g/g;

initPathes();
initArgs();
analyseArguments(argc, argv);
sendAllMessages();
}
catch (...){
qDebug() << "sxMailSender: Unhanded Exception!!! Application will be terminated.";
}--@

I mean for example in this source i try to catch div by zero. But I can't reach catch section and get OS exception message. So I need some how to catch all OS exceptions for my application.

giesbert

Did you read my post completely?

bq. structured exceptions (like div 0, null pointer, etc.) which can’t be catched by try/catch.

Therefore you need structured exception handling or exception translation.

maxim.prishchepa

Also you can use flag /EHa if you use compiler from Microsoft (description this flag you can find in "MSDN":http://msdn.microsoft.com/en-us/library/1deeycx5(v=vs.80).aspx

giesbert

/EHa does enable structured exception handling. It does not enable try/catch for structured exceptions.

jdarnold

I use the Windows ::SetUnhandledExceptionFilter API:

@
....
::SetUnhandledExceptionFilter( IGExceptionHandler );
...

#if defined(WIN32)
LONG WINAPI IGExceptionHandler( struct _EXCEPTION_POINTERS pExceptionInfo )
{
DWORD code = pExceptionInfo->ExceptionRecord->ExceptionCode;
IGLog( qDebug(), "Handling Visimeet Exception : " << code << " Address: " << pExceptionInfo->ExceptionRecord->ExceptionAddress);
if ( code == STATUS_ACCESS_VIOLATION )
{ // add this bit o' info
IGLog( qDebug(), "*** ACCESS VIOLATION ")
}
else if ( code == STATUS_ILLEGAL_INSTRUCTION )
{
IGLog( qDebug(), " ILLEGAL INSTRUCTION ");
}
else if ( code == STATUS_FLOAT_DIVIDE_BY_ZERO || code == STATUS_INTEGER_DIVIDE_BY_ZERO )
{
IGLog( qDebug(), " DIVIDE BY ZERO ");
}
else if ( code == IGLOGGER_FATAL_ERROR )
{ // our interanl error if qFatal is used
IGLog( qDebug(), " Qt FATAL ERROR ")
}
else
{
IGLog( qDebug(), " Unknown Fatal Error ****");
}

LONG retval = EXCEPTION_EXECUTE_HANDLER;

visiqt->sendReport(true);

return retval;

}
@

How to catch unhanded exception &#63;

How to catch unhanded exception ?