Re: [gtk-list] please help - I'm stumped

["Iain" <nodatadj webtribe net>]

You could use a timeout to call the framegrabber
something like
gtk_timeout_add (1000, getframe, im->mem);

getframe then has to return TRUE, so that it keeps being called.
see http://www.gtk.org/rdp/gtk/gtk-general.html#GTK-TIMEOUT-ADD

iain
>
> For the last few months I've been trying to write a gtk application that
reads
> data from a video card and shows the video in a window. I don't understand
> how to write an equivalent of the gtk_main_loop but with calls to the
framegrabber
> thrown in.
>
> I've tried the following approach:
>
> ----------------------
> GtkWidget *mainwin, *imgwin;
> GdkImage  *im;
>
> /* make a main window */
> mainwin = gtk_window_new(GTK_WINDOW_TOPLEVEL);
>
> /* make a gdkimage */
> im = gdk_image_new(GDK_IMAGE_NORMAL, gtk_widget_get_visual(mainwin),
width, height);
>
> /* make an image window*/
> imgwin = gtk_image_new(im, NULL);
>
> /* specify exit callback for main window */
> gtk_signal_connect (GTK_OBJECT (mainwin), "delete_event",
>                     GTK_SIGNAL_FUNC (destroy_main), NULL);
>
> /* add the image window to the main window */
> gtk_container_add(GTK_CONTAINER (mainwin), imgwin);
>
> /* go into the main loop */
> for(;;)
>    {
> while(gtk_events_pending())
>           gtk_main_iteration_do (FALSE);
>
> getframe(im->mem); /* This grabs the image and shoves it into the image */
> gtk_widget_show(imgwin);
> gtk_widget_show(mainwin);
>
> gdk_flush();
>     }
> -----------------------------------------
>
> But it simply loads the first image and freezes, it doesn't refresh. It
doesn't
> respond to the delete_event either.
>
> What am I doing wrong? and How do i fix it to display video at frame rate?
>
> (The framegrabber, does work - I've been able to display video with other
programs )
>
>
> Thanks in advance,
>       Sajit
>
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