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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Exception handler does not catch an exception
Date: Mon, 8 Jun 2009 00:37:41 -0700 (PDT)
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Date: 2009-06-08T00:37:41-07:00
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On Jun 8, 5:19=A0am, Rick <rickdu...@gmail.com> wrote:
> I am using an exception handler in the mainline of my program:
>
> exception
> =A0 =A0when Error : PROGRAM_ERROR =3D>
> =A0 =A0 =A0 Put_Line (Exception_Message (Error));
> =A0 =A0 =A0 Get_Line (Line, Last);
> =A0 =A0when Another_Error : others =3D>
> =A0 =A0 =A0 Put_Line (Exception_Message (Another_Error));
> =A0 =A0 =A0 Get_Line (Line, Last);
> end Phone_Keyboard;
>
> but I still get an error message:
>
> D:\ProgrammingFiles\Widgets\PhoneKeyboard\Phone_Keyboard
>
> Execution terminated by unhandled exception
> Exception name: PROGRAM_ERROR
> Message: EXCEPTION_ACCESS_VIOLATION
> Call stack traceback locations:
> 0x4483c5 0x7c9032a6 0x7c903278 0x7c90e488 0x407289 0x4017f2 0x401235
> 0x401286 0x7c817075
> [2009-06-08 10:48:19] process exited with status1 (elapsed time:
> 03.28s)
>
> Why is my exception handler not handling the exception?

I can see three possible reasons but I cannot be sure if you don't
post your entire program.

Possible cause 1: exception during elaboration, i.e. before your main
subprogram starts.
Possible cause 2: exception during elaboration of the main
subprogram's local variables, i.e. before its "begin" keyword.
Possible cause 3: exception in a task other than the environment task.

The stack trace points you to the exact location of the problem.

--
Ludovic Brenta.