Learn to Program, 2nd Edition

Renaming Your Photos

Let’s do something really useful now. A day ago I got an email from someone wanting to know how to rename a bunch of files. A year ago my wife wanted a program to download the pictures from her camera’s memory card and rename them. I’ll show you a modified version of her program.

But first, we ought to talk about a few new methods we’ll be using in this program. The first is the Dir[] method. We’ve seen [] used with arrays before…you did know that was a method, didn’t you? Oh, yeah, it sure is. You say “arr[2]” and I say “arr.[] 2”—it’s all the same.

Anyway, rather than using an array’s [] method, we’re using the object Dir’s [] method. (The Dir is for directory.) And instead of passing in a number, like with arrays, ...