Filename filtering

Programming Questions

procklipr..

in Programming Questions • 3 years ago

I would like my sketch to parse some text files in a subfolder to the sketches data folder, or perhaps in arbitrary folder. However, on a mac, the OS always creates a file called ".DS_Store". I would like my sketch to only read files that have a .txt extension. In general i would like to know how to code sketches that can use arbitrary file filters. Unfortunately the JavaDoc regarding the FileFilter interface is a bit over my head, and the processing.org documentation on file i/o is sparse. Any help or code snippets would be greatly appreciated!

Replies(1)

procklipr..

Re: Filename filtering

3 years ago

So after some googling and cut-pasting, I was able to cobble this together. I have to admit that I don't really 'get' it, but it works. I suspect I'll have to study up on Java File i/o to grok what's going on here.

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String[] fileNames;
// let's set a filter (which returns true if file's extension is .jpg)
java.io.FilenameFilter txtFilter = new java.io.FilenameFilter() {
boolean accept(File dir, String name) {
return name.toLowerCase().endsWith(".txt");
}
};
void setup() {
println("the sketch path is "+sketchPath);
String folderPath = selectFolder();
if (folderPath == null) {
// If a folder was not selected
println("No folder was selected...");
}
else {
// If a folder was selected, print path to folder
println(folderPath);
fileNames = listFileNames(folderPath, txtFilter);
println(fileNames);
}
}
// This function returns all the files in a directory as an array of Strings
String[] listFileNames(String dir,java.io.FilenameFilter extension) {
File file = new File(dir);
if (file.isDirectory()) {
String names[] = file.list(extension);
return names;
} else {
// If it's not a directory
return null;
}
}

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