[wxhaskell-users] Testing to see if a display is available

[Mads <mad...@ya...>]

Hi

I want to develop an application which opens a GUI if there is a display
available. If no display is available I want the application to
gracefully switch to console mode.

This leads me to the following question: How does one test if a display
is available using WxHaskell?

I have tried the catch (IO a -> (IOError -> IO a) -> IO a) function in
the IO monad like:

  main =3D catch someForm ( const $ putStr "No display available\n" )

  someForm =3D start $ do f <- frame []
                        set f [ layout :=3D widget $ label "Foo" ]

but WxHaskell do not call the exception handler function. WxHaskell Just
prints something like:

  Gtk-WARNING**: Cannot open display

I would appreciate any help I can get.

/Mads Lindstr=F8m