[Qt-interest] Handling exceptions in Qt

[Santhosh Y]

Hi Sean,

Thanks a lot; It works for me when I work with debug build.

But my catch block is not getting hit in case of release build of my app.

I have added following flag to my project file:
*QMAKE_CXXFLAGS_EXCEPTIONS_ON += -EHa*

This flag has anything to do with build type?
Please reply

Regards
Santhosh


On 7/19/2010 5:42 PM, Sean Harmer wrote:
> Hi,
>
> On Monday 19 July 2010 12:58:20 Santhosh Y wrote:
>    
>> I read some where to override an API on QApplication / QCoreApplication
>> for catching exceptions in a Qt application.
>> Can anybody tell me the API which I should override for handling
>> exceptions in my app.
>>      
> You need to override bool QCoreApplication::notify(). For example in one
> application we have where a library we are using can throw exceptions we have
> this in a class derived from QCoreApplication:
>
> bool ExceptionApplication::notify( QObject* receiver, QEvent* e )
> {
>      try {
>          return QApplication::notify( receiver, e );
>      }
>      catch ( char* err ) {
>          qDebug()<<  "ExceptionApplication::notify exception caught:"
>                   <<  QString( err );
> 		 // Do some other processing here...
>      }
>
>      return false;
> }
>
> By catching all your possible exceptions here you prevent the exception
> mechanism form unwinding the call stack any further and causing Qt to exit its
> event loop.
>
> HTH,
>
> Sean
> _______________________________________________
> Qt-interest mailing list
> Qt-interest at trolltech.com
> http://lists.trolltech.com/mailman/listinfo/qt-interest
>    


-- 
----------------------------------------------------
Y Santhosh Kumar -
Senior Software Engineer,
SoftJin Technologies Pvt Ltd,
www.softjin.com
----------------------------------------------------



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