SceIoDread Help

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I've been looking through pspiofilemgr.h and two file browser examples. I know I'm supposed to use SceIoDread to read the contents of the directory. The thing that I can't figure out is how to write the names of the files in that directory into a buffer. Anybody got an example to show me or something? Also, after looking through the code, I see that they use the SceIoDirent file structure, and it's referred to quite a bit. What purpose does it serve exactly?