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From: John B. Matthews, M.D. <johnbmatthews@my-deja.com>
Subject: Re: Calling XtAppAddTimeOut, help
Date: 1999/06/07
Message-ID: <7jh6s9$vua$1@nnrp1.deja.com>#1/1
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Date: 1999-06-07T00:00:00+00:00
List-Id: <comp.lang.ada>

Thanks to everyone who offered insight into this problem. Many pointed
out that XtAppContext wasn't being initialized; others observed that
there was no X event loop. The correct solution was a combination of
both. Specifically, the XtAppContext passed to XtAppAddTimeOut must be
precisely the same one created at initialization time and later used in
the event loop.

John

In article <matthewsj-ya023680003005990012190001@news.saic.com>,
  matthewsj@deleteme.saic.com (John B. Matthews, M.D.) wrote:
> Under IRIX 6.5, I'm trying to set up a callback using the X-windows
> function Xt.Intrinsic.XtAppAddTimeOut. For some reason, the code
raises
> Program_Error when the call to XtAppAddTimeOut occurs. Example code
> follows. I've tried making my own binding and allocating more space to
> Xt.Intrinsic.XtAppStruct. The SGI binding appears to match the
declaration
> in Intrinsic.h. A call to the obsolete function XtAddTimeOut succeeds,
but
> the callback never excecutes. Any insights much appreciated; post or
email
> (sans deleteme) is fine.
>
> Thanks in advance,
>
> John
>
> ----- gnatchop here ----
> -- gnatmake -g -n32 -mips3 timeout.adb -largs -lXm -lXt -lMrm -lX11
> with Ada.Unchecked_Conversion;
> with System;
> with Text_IO;
> with Timer_CB;
> with Xt.Intrinsic;
>
> procedure TimeOut is
>
> --- Convert a System.Address to an XtPointer
> function To_XtPointer is new Ada.Unchecked_Conversion (
>     System.Address, Xt.Intrinsic.XtPointer);
>
> --- Timer static data
> App_Context : Xt.Intrinsic.XtAppContext := new
Xt.Intrinsic.XtAppStruct;
> Timer_Id    : Xt.Intrinsic.XtIntervalId := 0;
>
> begin
>     --- Add a timer callback
>     Timer_Id := Xt.Intrinsic.XtAppAddTimeOut ( -- dies here!
>         App_Context => App_Context,
>         Interval    => 200, -- 200 msec
>         Proc        => Timer_CB.Timer_Callback'Access,
>         Closure     => To_XtPointer (Timer_Id'Address));
>     Delay 10.0;
>     Text_IO.Put_Line("Main ends.");
>
> end;
>
> package body Timer_CB is
>
> procedure Timer_Callback (
>     Closure : Xt.Intrinsic.XtPointer;
>     Id      : access Xt.Intrinsic.XtIntervalId) is
> begin
>     Text_IO.Put_Line("In callback.");
> end Timer_Callback;
>
> end;
>
> with Text_IO;
> with Xt.Intrinsic;
>
> package Timer_CB is
>
> procedure Timer_Callback (
>     Closure : Xt.Intrinsic.XtPointer;
>     Id      : access Xt.Intrinsic.XtIntervalId);
> pragma Convention (C, Timer_Callback);
>
> end;
> ----- code ends -----
>


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