Re: [wxhaskell-users] Segmentation fault

[Henk-Jan v. T. <hj...@ch...>]

On Fri, 20 Feb 2009 00:17:05 +0100, Eric <er...@ma...> wrote:

> Dear all,
>
> When I run the following program I get a "Segmentation fault/access
> violation". Can anyone see the problem?
>
> ***
>
> main = start gui
>
>
> gui = do{
>     f <- frame [text := ""]
>     ;book <- notebook f []
>     ;page <- new_page f
>     ;set f [layout := tabs book [page]]
>     ;set f [position := pt 0 0, clientSize := sz 900 700]
>     ;return()}
>
>
> new_page :: Window a -> IO TabPage
> new_page wnd = do
>     txt_gui <- textCtrl wnd []
>     pnl <- panel wnd []
>     empty_bitmap <- bitmapCreateEmpty (sz 1 1) 1
>     let tab_page = ("Blank", empty_bitmap, container pnl (fill . widget
> $ txt_gui))
>     return tab_page
>
> ***
>
> Eric M.

The GHCi debugger [1] shows that the crash occurs while evaluating the  
line:
>     ;set f [layout := tabs book [page]]

The description of "tabs" contains the phrase:
   The pages always need to be embedded inside a container

See the file samples\wx\Controls.hs of the wxHaskell package for an  
example how to use a notebook.

[1]  
http://www.haskell.org/ghc/docs/latest/html/users_guide/ghci-debugger.html

-- 
Regards,
Henk-Jan van Tuyl


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