Re: [wxhaskell-users] ANN: wxHaskell 0.11.1

[Jeroen J. <Jer...@ug...>]

Hey Mads,

This seems to be correct.  If I modify my testprogram to this:

module Main where

import Graphics.UI.WX
import System.IO

main :: IO ()
main
  = do hPutStrLn stderr "WX checkpoint alpha"
       --start hello

hello :: IO ()
hello
  = do f    <- frame    [text := "Hello!"]
       quit <- button f [text := "Quit", on command := close f]
       set f [layout := widget quit]

Where start does not even get called, I get the same errors and infinite loop 
(without ever getting the "WX checkpoint alpha").  Removing the hello 
function and the import function outputs the string correctly without any 
errors.

The strangest thing is that wxpython works flawlessly, so I am not sure 
whether the problem is not in part due to some bug with ghc 6.8.3.

On Monday 12 January 2009 00:33:05 Mads Lindstrøm wrote:
> Hi Jeroen
>
> I wrote:
> > Hi Jeroen
> >
> > While my windows show up just fine, I do get similar warnings to you:
> >
> > (process:12227): GLib-GObject-CRITICAL **: gtype.c:2240: initialization
> > assertion failed, use IA__g_type_init() prior to this function
> >
> > (process:12227): Gdk-CRITICAL **: gdk_cursor_new_for_display: assertion
> > `GDK_IS_DISPLAY (display)' failed
> >
> > (process:12227): GLib-GObject-CRITICAL **: gtype.c:2240: initialization
> > assertion failed, use IA__g_type_init() prior to this function
> >
> > (process:12227): Gdk-CRITICAL **: gdk_cursor_new_for_display: assertion
> > `GDK_IS_DISPLAY (display)' failed
> >
> > I think we to call g_type_init()
> > (http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information
> >.html#g-type-init) somewhere in the wxHaskell code, to avoid these
> > warnings and possibly your wxHaskell to work. I am looking into it.
>
> I changed the start-function (in wx/src/Graphics/UI/WX.hs) from:
>
> -- | 'start' runs the GUI.
> start :: IO a -> IO ()
> start io
>   = run (unitIO io)
>
> to:
>
> -- | 'start' runs the GUI.
> start :: IO a -> IO ()
> start io
>   = do hPutStrLn stderr "WX checkpoint alpha"
>        hFlush stderr
>        run (unitIO io)
>
> And I now get the output:
>
> (process:14665): GLib-GObject-CRITICAL **: gtype.c:2240: initialization
> assertion failed, use IA__g_type_init() prior to this function
>
> (process:14665): Gdk-CRITICAL **: gdk_cursor_new_for_display: assertion
> `GDK_IS_DISPLAY (display)' failed
>
> (process:14665): GLib-GObject-CRITICAL **: gtype.c:2240: initialization
> assertion failed, use IA__g_type_init() prior to this function
>
> (process:14665): Gdk-CRITICAL **: gdk_cursor_new_for_display: assertion
> `GDK_IS_DISPLAY (display)' failed WX checkpoint alpha
>
>
> That is, the checkpoint comes _after_ the GLib error, and as the
> start-function is the very first function to be called, it leads me to
> conclude that the error is not with the Haskell code. So I assume it
> must be some library initialization. Unfortunately, I have no knowledge
> of whats gets called as part of library initialization and I do not know
> where to look. If anyway, can help me with this I would be most happy.
>
>
> Greetings
>
> Mads Lindstrøm
>
> > This bugs seems to be similar to what you (and I) are experiencing
> > https://bugzilla.redhat.com/show_bug.cgi?id=442977 .
> >
> >
> > Greetings,
> >
> > Mads Lindstrøm
> >
> > Jeroen Janssen wrote:
> > > Follow-up:
> > >
> > > With latest darcs version, showing revision 0.11.1 this time, this
> > > error does not occur any longer.  However, wxhaskell is still not
> > > working as now programs fail with:
> > >
> > > (process:3353): GLib-GObject-CRITICAL
> > > **: /build/buildd/glib2.0-2.16.6/gobject/gtype.c:2248: initialization
> > > assertion failed, use IA__g_type_init() prior to this function
> > >
> > > (process:3353): GLib-CRITICAL **: g_once_init_leave: assertion
> > > `initialization_value != 0' failed
> > >
> > > (process:3353): Gdk-CRITICAL **: gdk_cursor_new_for_display: assertion
> > > `GDK_IS_DISPLAY (display)' failed
> > >
> > > This happens for the example I mentioned in my previous e-mail but also
> > > for the examples included with wxhaskell (BoxedCombinator etc).
> > >
> > > Any help with this?  The parameters stayed the same as in my previous
> > > e-mail (Ubuntu 8.04, wxwidgets/wxgtk 2.8.7 ubuntu version), I even
> > > tried updating to wxwidgets 2.8.9, but to no avail, same error.
> > > I build wxhaskell with "cabal" install, followed by the cd wx en usual
> > > build process if that may be of any help.
> > >
> > > Kind regards,
>
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