The movie The Little Prince is not a straight retelling of this tale. Rather, it's sort of a story within a story. The Little Prince narrative is imparted in bits and pieces, set within the framework of another story.
The Little Prince isn't a perfect movie, but is one that is worth watching and thinking about afterwards. I own a copy of The Little Prince book; when I get some time I think I'll pull it out and maybe do a comparison to the film.