From: Pawel Szymczykowski <makenai@...>
Date: 2005-10-19T16:13:54+09:00
Subject: Re: FXImage problems

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Oops! Sorry. I was supposed to post this to the fxruby list instead. Feel
free to just ignore it or chide me a bit if it helps to equalize things.

-Pawel

On 10/19/05, Pawel Szymczykowski <makenai@gmail.com> wrote:
>
> Hi,
>
> I'm trying to combine FXRuby with RMagick. I've searched the mail archive=
s
> (I had to index them myself! Is there an easy to use official search page
> somewhere?) and apparently it's been done before, but I can't seem to get
> it
> to work.
>
> Basically I'm processing my image and then doing an export_pixels and
> trying
> to convert it to the FXImage format. It works the first time, but when I
> try
> to do it again it crashes on my saying 'invalid image' in Linux, or
> something useless about abnormal termination in Windows.
>
> This is the piece of code that seems to be giving me the specific trouble=
:
>
> pixels =3D []
> @current_image.export_pixels(0, 0, @current_image.columns,
> @current_image.rows,
> "RGBA").each_slice(4) { |rgba| pixels << FXRGBA( *rgba ) }
> an_image =3D FXImage.new(app, pixels, IMAGE_OWNED|IMAGE_KEEP,
> @current_image.columns, @current_image.rows )
>
> That works the first time - I get a nice picture as expected when drawn t=
o
> the canvas. The next time it happens via a timeout, I get the crash.
> Actually, it's more like it works fine if I do it before calling
> app.create(or maybe run?), but not afterwards.
>
> I've also tried the following as mentioned in one of the messages in the
> archives, but it complains that it's looking for an Array (buffer is
> FXMemoryBuffer class of course):
>
> buffer =3D FXMemoryBuffer.new( pixels )
> an_image =3D FXImage.new(app, buffer, IMAGE_OWNED|IMAGE_KEEP,
> @current_image.columns, @current_image.rows )
>
> I've tried several different combinations of the flags, and putting
> an_image.create in various places. The former didn't help at all, but in
> the
> latter I just got a black image.
>
> Am I doing something idiotic somewhere? I'm kind of new to ruby and GUI
> development in general being more of web app guy. I can post a runnable
> version of the code up somewhere if the problem isn't completely obvious
> and
> of course if someone is feeling charitable enough to take a look at it.
>
> Thanks for your help!
>
> -Pawel
>
>

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