Re: GTK+ & images

[Stefan Kost <kost imn htwk-leipzig de>]

Hi Alf,

generally I recomment to use e.g.

GDK_WINDOW(window) instead of (GdkWindow *)window

The first version by default does run-time checking and you will get error in
the console when running such code. If you need maximum speed you can add
options to you configure.ac that define G_DISABLE_CAST_CHECKS (dont do this when
developing though). That would turn the first version into the second version.

Stefan

Alf C Stockton wrote:
> On Tue, 4 Jan 2005, Hubert Sokolowski wrote:
>
> > > I have not been able to find a way to add an image to the background
> > > of a
> > > window
> > > created with glade.
> > > I would like to have the base window to have a background image and each
> > > button
> > > on that window to also have an image as background. I have seen this
> > > done
> > > on VB
> > > & want the same functionality in GTK+.
> > > Can this be done?
> >
> > yes,
> > http://developer.gnome.org/doc/API/2.0/gdk/gdk-Windows.html#gdk-window-set-back-pixmap
> I have tried that as follows:-
>
> int main(int argc, char **argv)
> {
>    GtkWindow *window;
>    GtkButton *button;
>    GtkImage  *image;
>    GdkPixbuf *orig_pixbuf;
>
>    /* Initialize GTK+ */
>    gtk_init(&argc, &argv);
>
>    /* create window, set default height and width to 200 pixels */
>    window = g_object_new(GTK_TYPE_WINDOW,
>                          "default-height", 640,
>                          "default-width", 480,
>                          "border-width", 12,
>                          "title", "Kiosk",
>                          NULL);
>
>    image = g_object_new(GTK_TYPE_IMAGE, "file", "Background.jpg", NULL);
>    g_object_get(image, "pixbuf", &orig_pixbuf, NULL);
>    g_object_set_data(G_OBJECT(image),"orig_pixbuf",(gpointer)orig_pixbuf);
>    gdk_window_set_back_pixmap((GdkWindow *)window, (GdkPixmap *)image,
> FALSE);
>
> but when I run the program I get:-
> (Kiosk:2175): Gdk-CRITICAL **: file gdkwindow-x11.c: line 2508
> (gdk_window_set_back_pixmap): assertion `GDK_IS_WINDOW (window)' failed
>
> ---
>
> Regards,
> Alf Stockton    www.stockton.co.za
>
> Real programmers don't write in BASIC.  Actually, no programmers write
> in BASIC after reaching puberty.
> NOTE: Dear Outlook users: Please remove me from your address books.
>        Read this article and you know why:
>        http://newsforge.com/article.pl?sid=03/08/21/143258
>
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-- 
      \|/            Stefan Kost
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