Read quantity of specific files on data folder

tsouz

How could I know how much files are of a specific kind on Processing's data folder or other specific folder?

Such as '.mp4'

GoToLoop

http://forum.processing.org/two/discussions/tagged/filenamefilter

tsouz

Thanks, @GoToLoop! One little thing:

As for http://forum.processing.org/two/discussion/8233/counting-the-files-in-a-folder#latest

And if the number of mp4 files before each execution of the program is static, I could use the sample:

File f = dataFile("folderName");
String[] names = f.list(FILTER);
printArray(names);

And after get names.length to be aware of the number? The folder name shoud be "data"? And what would be an example of FILTER?

GoToLoop

If those ".mp4" files are inside sketch's "/data/" subfolder, and you're only interested about how many there are, the code below goes direct to the point: ;)

// forum.processing.org/two/discussion/11279/
// read-quantity-of-specific-files-on-data-folder

import java.io.FilenameFilter;

static final FilenameFilter MP4_FILTER = new FilenameFilter() {
  @ Override boolean accept(File path, String name) {
    return name.toLowerCase().endsWith(".mp4");
  }
};

void setup() {
  int qty = dataFile("").list(MP4_FILTER).length;
  println(qty);
  exit();
}

P.S.: If you're sure all ".mp4" extensions are 100% in toLowerCase() already, that is there's no ".MP4", you can safely remove it and gain some minuscule speed: return name.endsWith(".mp4");

tsouz

Thank you, @GoToLoop! Got it all.