Re: [gtkmm] GdkDrawable Newbie Question

[Clemens Auer <Snoopy_The_Fish gmx net>]

Maybe (!!) you need an explicit cast .. 
but i dont know for sure

Clemens

On Tue, 12 Aug 2003 22:36:41 -0400
Kent Moya <fliegen bellsouth net> wrote:

> Hello,
> 
> I am new to gtkmm (I'm using 2.2.5 on RedHat 9), and I am trying to 
> write a program in which I would like to manipulate individual bits in
> a window.  I am trying to use the gdk_draw_rgb_image() function to do 
> this, but I can't seem to get it to compile, I keep getting the 
> following error:
> 
> cannot convert `Glib::RefPtr<Gdk::Window>' to `GdkDrawable*' for 
> argument `1' to `void gdk_draw_rgb_image(GdkDrawable*, GdkGC*, int,
> int, int, int, GdkRgbDither, guchar*, int)'
> 
> I have attached some sample code below that produces this compiler
> error for me.  I hacked this code together from some of the examples
> in the documentation, but I think it should work.
> 
> class rgb_draw_area: public Gtk::DrawingArea
> {
>      guchar *rgbbuff;
>      public:
>          rgb_draw_area(int x_size = 0, int y_size = 0);
>          virtual bool on_expose_event(GdkEventExpose *event);
>          guchar *get_buffer() const;
> };
> 
> virtual bool rgb_draw_area::on_expose_event(GdkEventExpose *event)
> {
>      gdk_draw_rgb_image(this->get_window(),
>                         this->get_style()->get_fg_gc(GTK_STATE_NORMAL
>                         ), 0,
>                         0,
>                         400,
>                         200,
>                         GDK_RGB_DITHER_MAX,
>                         this->rgbbuff,
>                         (this->width)*3);
> }
> 
> int main(int argc, char* argv[])
> {
>     Gtk::Main kit(argc, argv);
> 
>     Gtk::Window win;
>     win.set_default_size(400, 200);
> 
>     rgb_draw_area area;
>     win.add(area);
>     area.show();
> 
>     Gtk::Main::run(win);
> 
>     return 0;
> }
> 
> 
> I was under the impression that a Gdk::Window was a child of 
> Gdk::Drawable - is that not tue?  Every code snippet I've seen that
> uses the gdk_draw_rgb_image (or similar) function simply passes in a
> call to get_window() (as is done above), but I can't seem to get that
> to work. Does anyone have any pointers, or any idea what I'm doing
> wrong?
> 
> Thanks!
> 
> Kent
> 
> _______________________________________________
> gtkmm-list mailing list
> gtkmm-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtkmm-list
> 


-- 

    Auer Clemens
    5310 Mondsee
    AUSTRIA

    0043 664 3530901