[Haskell-cafe] Exiting GLUT application

[Dave Tapley]

Unfortunately whilst the new code is returning me to a 'Main >' prompt
as required another problem has come up.

The issue here is found when the code is executed in both GHCi (6.6)
and hugs (20050308).
Once the code below is loaded evaluating main opens an unfilled window
as required.

However if this window is closed and main is evaluated again both GHCi
and hugs die thus:

GHCi: Illegal instruction (core dumped)
hugs: Unexpected signal

Any thoughts?


On 31/07/07, Dave Tapley <dukedave at gmail.com> wrote:
> Excellent, thank you Marc your advice worked perfectly.
>
> For reference the corrected code reads:
>
> > import Graphics.UI.GLUT
> > main = do
> > getArgsAndInitialize
> > createWindow ""
> > actionOnWindowClose $= ContinueExectuion
> > mainLoop
>
> Dave,
>
>
> On 31/07/07, Marc A. Ziegert <coeus at gmx.de> wrote:
> > in old glut, the main loop was the core of the single threaded program. exiting it did mean to exit the program completely.
> > in freeglut, you have alternatives. but for compatibility, it defaults to the old behaviour.
> >
> > <http://haskell.org/ghc/docs/latest/html/libraries/GLUT/Graphics-UI-GLUT-Begin.html#v%3AExit>
> >
> > - marc
> >
> >
> > Am Dienstag, 31. Juli 2007 19:16 schrieb Dave Tapley:
> > > Hi everyone, I have the following skeleton GLUT code:
> > >
> > > > import Graphics.UI.GLUT
> > > > main = do
> > > >     getArgsAndInitialize
> > > >     createWindow ""
> > > >     mainLoop
> > >
> > > It loads into both hugs and ghci fine and when 'main' is evaluated an
> > > empty window opens as expected.
> > > However when closing the window (clicking the window manager's x
> > > button) both hugs and ghci exit with the window, as opposed to
> > > returning to the the 'Main>' prompt.
> > >
> > > I suspect I need some callback to exit the GUI cleanly?
> > >
> > > Cheers,
> > > Dave
> > > _______________________________________________
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> > >
> >
> >
>