C++ Builder IDE, exception capturing

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C++ Builder IDE >> exception capturing

by srinivas » Thu, 22 Dec 2005 13:20:59 GMT



If new operator is failed the borland raising the exception and displaying message box
how can i catch that exception before borland it self display the message box

thanks
srinivas

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C++ Builder IDE >> exception capturing

by Andrue Cope [TeamB] » Thu, 22 Dec 2005 16:59:46 GMT






This is really a C++ language issue so would be best asked in
.cpp.language but the answer is to use the language construct
try..finally.

For more information please ask in .cpp.language

--
Andrue Cope [TeamB]
[Bicester, Uk]
http://info.borland.com/newsgroups/guide.html


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C++ Builder IDE >> exception capturing

by Remy Lebeau (TeamB) » Thu, 22 Dec 2005 18:17:08 GMT






I think you mean a try..catch, don't you? A try..finally won't stop the
exception from continuing up the call stack after the finally block exits.


Gambit



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exception capturing

by Remy Lebeau (TeamB) » Thu, 22 Dec 2005 18:21:57 GMT






Wrap the allocation in a try..catch block. However, what you actually catch
depends on what you are allocating in the first place. The 'new' operator
is supposed to throw a std::bad_alloc exception when it fails, ie:

try
{
// use 'new' as needed ....
}
catch(const std::bad_alloc &)
{
// handle the failure as needed....
}

Or:

try
{
// use 'new' as needed ....
}
catch(const std::exception &)
{
// handle the failure as needed....
}

Or:

try
{
// use 'new' as needed ....
}
catch(...)
{
// handle the failure as needed....
}

However, if you are allocating a VCL object, then you will usually get a VCL
Exception instead because the VCL memory manager is used instead of the
C/C++ memory manager.

try
{
// use 'new' as needed ....
}
catch(const Exception &)
{
// handle the failure as needed....
}

Or you can combine them all:

try
{
// use 'new' as needed ....
}
catch(const Exception &)
{
// handle the VCL exception as needed....
}
catch(const std::exception &)
{
// handle the standard exception as needed....
}
catch(...)
{
// handle everything else as needed....
}


Gambit



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exception capturing

by Andrue Cope [TeamB] » Thu, 22 Dec 2005 18:37:14 GMT





Oops, yes. Why on Earth did I type 'finally'? I've not used that for
years. Must be getting too close to the holidays :-/

--
Andrue Cope [TeamB]
[Bicester, Uk]
http://info.borland.com/newsgroups/guide.html

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Hmmm

Since I catch the exception... I should be able to continue the program
lol...

But when calling 'get game list' for a second time it will say: connection
already open.

This might be a good example where to include try... finally;

Let's try to think up an example/pseudo code:

try
    try
        Connection.Open;

        ExecuteSql;

    except

    end;

finally

    Connection.Close;

end;

BUT WHAT THE FUCK ABOUT WHEN THE Connection.Open fails ?!

Calling Connection.Close is not wise if connection.open failed !

SO THIS SUCKS

ANOTHER STUPID EXAMPLE OF EXCEPTIONS !

Hmmm let s see maybe try finally is just retarded... and we should use
something else instead.

We could still use try finally.

try

    try
        Connection.Open;

        ExecuteSQL;

    except


    end;

finally

    try
        Connection.Close
    except

    end;

end;

Ieeewwwww..

Am I supposed to program like this ?

Ofcourse this code will probably not work...

Since if Connection.Open fails... it will raise an exception... and that
exception will be caught by the first

exception handler.. so finally will probably never be reached !

Hmmm maybe that's a good thing :)

Since I dont want to call Connection.Close if open fails.

Oh well let's see if that works :D

Skybuck.

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