NewLC - Is it possible to "Trap" a Panic? - Comments

Re: Is it possible to "Trap" a Panic?

mserougi — Wed, 09 May 2007 15:43:49 +0200

Quote from: alh

But it doesn't show the panic dialog on a real device does it?

If it only shows on emulator, it is not much of a problem, or?

If it only shows on the emulator then I couldn't care less. But it doesn't show on the emulator and shows only on the device.

Re: Is it possible to "Trap" a Panic?

alh — Wed, 09 May 2007 11:24:50 +0200

But it doesn't show the panic dialog on a real device does it?

If it only shows on emulator, it is not much of a problem, or?

Re: Is it possible to "Trap" a Panic?

tote — Wed, 09 May 2007 11:19:35 +0200

Hmm, then I might not have a solution for that, sorry.

Also note (you might have already noticed) that there is a similar topic that also discusses this issue: http://forum.newlc.com/index.php?topic=14480.

Tote

Re: Is it possible to "Trap" a Panic?

mserougi — Wed, 09 May 2007 11:02:21 +0200

Even if my faulty code is run from another thread, the faulty code panics and I get to see the KERN-EXEC 3 message, for example.

My goal is to handle such messages, to catch this kind of panics and exit gracefully, without showing the KERN-EXEC 3 message, for example.

Re: Is it possible to "Trap" a Panic?

tote — Tue, 08 May 2007 13:35:43 +0200

Yep, run your code in a separate thread other than the main. In case of a panic in the "2nd" thread you can evaluate the reason of exiting in the main thread.

Cheers,

Tote

Re: Is it possible to "Trap" a Panic?

mserougi — Tue, 08 May 2007 12:45:14 +0200

Tried both ways, but none works on any actual device; panics are still generated and the exception handler is completely ignored.

Any ideas?

Re: Is it possible to "Trap" a Panic?

borat — Wed, 13 Dec 2006 02:21:52 +0100

Making possible to 'catch' a panic using a thread or install exception handler.

Re: Is it possible to "Trap" a Panic?

saurabh_gyl — Tue, 05 Dec 2006 08:27:33 +0100

No you cannot TRAP a panic. Though you can TRAP a leave.
the difference in a leave and a panic is :

Leave : a leave occurs under exceptional condition like out of memory or the absence/failure of a communiction link which essentially is not a programmers fault. a leave ca is always caught at the last TRAP in the call stack. the thread continues its execution from there on.

Panic : Some types of error are due to bad program code, such as passing an illegal parameter value. When this type of error is discovered, the thread associated with the erroneous program should be terminated. In Symbian OS, this is a referred to as a panic. The only proper response to a panic is to fix the program code. Never ever a program shoul be released which can result in a panic.

I hope this clears your doubt,

And reagrding your getting USER 23 panic refer SDK documentation, it says :

This panic is raised when any operation that moves or copies data to an 8 bit variant descriptor, causes the length of that descriptor to exceed its maximum length.

It may be caused by any of the copying, appending or formatting member functions and, specifically, by the Insert(), Replace(), Fill(), Fillz() and ZeroTerminate() descriptor member functions. It can also be caused by the SetLength() function.

Is it possible to "Trap" a Panic?

euroq — Fri, 01 Dec 2006 19:49:07 +0100