selectFolder() image filter

SilentAce

Hi members,

I am using selectFolder() for the folder path and FilenameFilter class to filter some file extensions. The filter is working fine and i can get the filtered file names with println() from the selected folder. But request an image with that name inside the folder simply won't work. Every time i do this i get NullPointerException. I also use the controlP5 library for a textfield and a button.

import controlP5.*;
import java.io.File;
import java.io.FilenameFilter;

ControlP5 dirPath, dirButton;
PImage[] defImage;

String filter;
File[] listFiles, listFolders;
String selectedAbsolutePath, selectedAbsolutePathUnix, selectedFolderName;
String[] dirSubfolders, dirFiles;

void setup() {
  size(600, 600, P3D);
  background(255);
  fill(255);

  PFont font = createFont("Calibri-48.vwl", 12);

  dirPath = new ControlP5(this);
  dirButton = new ControlP5(this);  

  dirPath.addTextfield("input")
    .setPosition(20, 20)
    .setSize(200, 30)
    .setLabel("")
    .setAutoClear(false)
    .setFont(font)
    .setFocus(true)
    .setColor(color(255, 255, 255));

  //OpenDirectory is the button ID. setLabel gives the name to be viewed   
  dirButton.addButton("OpenDirectory")
    .setLabel("Open Directory")
    .setPosition(250, 25)
    .updateSize();
}

void draw() {
  background(0);
  //text(String.valueOf(selectedFolderName), 100, 400);
}

void checkFilter() {
  Filter filter = new Filter(".jpg");
  File parentDir = new File(selectedAbsolutePath);
  String[] flist = parentDir.list(filter);

  for (int i=0; i < flist.length; i++) { 
    println(selectedAbsolutePathUnix + "/" + flist[i]);
    try {
      defImage[i] = requestImage(selectedAbsolutePathUnix + "/" + flist[i]);
      image(defImage[i], 200, 200);
    } 
    catch(Exception e) {
      e.printStackTrace();
    }
    println(flist[i]);
  }
}

class Filter implements FilenameFilter {
  String extension;

  Filter(String extns) {
    extension = extns;
  }

  public boolean accept(File dir, String name) {
    return name.toLowerCase().endsWith(this.extension);
  }
}

// Methods is connected with selectFolder()
void setDirectoryPath(File selection) {
  if (selection != null) {
    selectedAbsolutePath = selection.getAbsolutePath();
    selectedAbsolutePathUnix = selectedAbsolutePath.replace("\\", "/");
    selectedFolderName = selection.getName();
    // send the absolute path to the textfield input
    dirPath.get(Textfield.class, "input").setText(selectedAbsolutePath);
    checkFilter();
  }
  else {
    println("Windows was or user hit cancel.");
  }
}

// Button event directory selection
void OpenDirectory() {
  //println("Directory selection is pressed");
  selectFolder("Select a folder to process:", "setDirectoryPath");
}

GoToLoop

Funny in my example below it worked alright.:

http://forum.processing.org/two/discussion/2578/how-to-filter-and-order-a-set-of-files

I've used an anonymous instantiation rather than make a custom class outta FilenameFilter though. 8-X

import java.io.FilenameFilter;

static final FilenameFilter PICS_FILTER = new FilenameFilter() {
  final String[] EXTS = {".png",".jpg",".jpeg",".gif",".tif",".tiff",".tga",".bmp"};

  @ Override boolean accept(final File dir, String name) {
    name = name.toLowerCase();
    for (final String ext : EXTS)  if (name.endsWith(ext))  return true;
    return false;
  }
};

SilentAce

Thanks GoToLoop :).