question about gdk_imlib_save_image

Dear Sirs,
I have read the dicusssion about saving pixmap to a file in the maillist of gtk.
And I also read the imlib programmer guides .
Now I am trying to use this function when I click the button.
Here is the problem: pixmap is saved to file successfully(file is really existing), but i can't see anything related to my pixmap when i open this file.
Could anyone please help me figure the bugs out?
Best Regards,
Calvin Chen
brief code as follow:
void button_clicked(GtkWidget *button, GtkWidget *window)
    GdkPixmap *strmap = NULL;
   GdkImlibImage *image = NULL;
   strmap = gtk_object_get_data(GTK_OBJECT(window), "pixmap");    /*pixmap is created in main and set to window*/
   image = gdk_imlib_create_image_from_drawable(strmap, NULL, 0, 0, 400, 200);
   gdk_imlib_save_image(image, "test.xpm", NULL);
   /* I have tried gdk_imlib_save_image_to_*(), but it didn't work either. */

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