Refreshing an Image

[Matt Sampson <matt met fsu edu>]

First of all I am brand new to GTK+, but not C.  After banging my head
against a wall for a week I feel I am no closer to a solution, so that's
why I'm here.  Now that's out of the way... I am trying to write a
program that will grab an image from file display it then (by using a
g_timeout_add()) call a function that grabs another image from file and
display it in the same window as the first image (replacing the first
image being shown).  So the program is just going to cycle showing a new
picture every 3 seconds. Similar to looking a radar picture (i.e. it is
displayed taking up the whole monitor screen and the picture just keeps
refreshing every second or so showing movement of the front or
whatever).  I have gotten the program to work very cruedly... I create a
widget (window), a widget (vbox), and a widget (image).  I assign them
values using the gtk_*_new() functions. I then gtk_container_add(window,
vbox), then pack in the image to the vbox.  The only way I could get it
to grab new pictures and redisplay them was to destroy the window widget
reassign values to all my widgets and do conatainer add and pack the
image in the vbox again.  I know this is very crude and I am sure that
some other functions, or processes will afford me to do this in a better
way, ie having just the image widget refresh in the window, but I have
been unable to make it work using gtk_widget_queue_draw(), or about any
number of other methods, which I admit I don't fully understand, (i.e.
pixmaps, pixbufs, copying to drawing area, etc.) Sorry for the long
windedness but I wanted to display exactly what I'm trying to do and the
only way I could make it work, if anyone can offer advice on how to
successfully tackle this please advise.  Any help is much appreciated
and I thank you in advance.