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Newsgroups: comp.lang.ada
Date: Mon, 20 Sep 2021 23:49:47 -0700 (PDT)
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Subject: Re: Exception Handling within Gtkada
From: Vadim Godunko <vgodunko@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:62802
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On Monday, September 20, 2021 at 3:06:02 PM UTC+3, ldries46 wrote:
> I want an exception to be seen within an existing window of Gtkada to be able to see details of the error. So I used:
> 
> exception
> when no_const =>
> Main_Window.Buffer.Insert_At_Cursor
> ("-------------------------------------------------------------------------"
> & To_String(CRLF));
> Main_Window.Buffer.Insert_At_Cursor("Error : io_const" & to_String(CRLF));
> end Test_Exception;
> 
> In this case the the program ends and the reason of the exception is lost. I want this only for a selected nr of exceptions. In this case the exception no_const.

Generally, Ada exceptions must not left scope of callback function. Thus, such code should be added to each callback/event handler/etc. subprogram of your application.