How to catch unhanded exception ?
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
6 replies
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.
- 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.
Also you can use flag /EHa if you use compiler from Microsoft (description this flag you can find in MSDN [msdn.microsoft.com]).aspx
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;
- }
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