Changing a previously created GtkImage

[tsaud <tom sauder plasmon com>]

I have created an image from a file using 
image1 = gtk_image_new_from_file("pictures/Empty.gif");
gtk_widget_set_name (image1, "image1");

and displalyed it using:
gtk_widget_show(image1);
gtk_box_pack_start(GTK_BOX (hbox1), image1, TRUE, TRUE, 0);

and that works fine.  The image is correctly displayed where I want it. 
Later, when a particular event happens (right now I have assigned it to a
button press), I want to change the image to the image in the file
"pictures/Full.gif" (which is exactly the same size as Empty.gif).  To do
that, I did the following:

void on_button1_pressed (GtkButton *button, gpointer user_data)
{
   GtkWidget *imageptr;
   imageptr = lookup_widget(GTK_WIDGET(button), "image1");
   if(imageptr != NULL)
   {
      gtk_image_set_from_file(GTK_IMAGE(imageptr), "pictures/Full.gif");
   }
   else
      fprintf(stderr, "image1 not found\n");
}

When I press the button, the image is replaced by a broken image icon, not
the new image.  What am I doing wrong?  I am obviously getting the correct
widget with the lookup_widget call, since the image changed.  The file
"Empty.gif" and the file "Full.gif" are in the same directory, and when I
change the gtk_image_new_from_file() call to load the "Full.gif" file, that
works fine as well, so I know the file is there and readable.  I just don't
understand why it didn't change to the new image.

Thanks,
T


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