Using Processing 3-0-1 (not updated yet), I have a problem with the dataPath() function.
My code :
final String path = dataPath(""); //... void setup(){ //... println(path); //... } This displays in the console :
/media/ubuntu/Expansion Drive/Programmation/Java/Processing/Ubuntu/processing-3.0.1/null/data
but it should display (according to the Documentation and my tries in other projects) :
/media/ubuntu/Expansion Drive/Programmation/Java/Processing/Projets/Time_Fighter/data
So it seems it's returning a path the Processing instead of a path to my project ? Plus, why is there a 'null' ?
The question is, do you know a way that would work to have the path of my sketch ?
PS. A friend of mine proposed to use the File class instead, I had this result :
File file = new File("data"); //... void setup(){ //... file.getAbsolutePath(); //... } Which returned :
/media/ubuntu/Expansion Drive/Programmation/Java/Processing/Ubuntu/processing-3.0.1/data
PPS. I'm using Ubuntu (Mate)...
2 Answers
You shouldn't use the dataPath() function. You should use the sketchPath() function.
From the Processing source for dataPath():
/** * <b>This function almost certainly does not do the thing you want it to.</b> * The data path is handled differently on each platform, and should not be * considered a location to write files. It should also not be assumed that * this location can be read from or listed. This function is used internally * as a possible location for reading files. It's still "public" as a * holdover from earlier code. * <p> * Libraries should use createInput() to get an InputStream or createOutput() * to get an OutputStream. sketchPath() can be used to get a location * relative to the sketch. Again, <b>do not</b> use this to get relative * locations of files. You'll be disappointed when your app runs on different * platforms. */ public String dataPath(String where) { return dataFile(where).getAbsolutePath(); } And here's sketchPath():
/** * Prepend the sketch folder path to the filename (or path) that is * passed in. External libraries should use this function to save to * the sketch folder. * <p/> * Note that when running as an applet inside a web browser, * the sketchPath will be set to null, because security restrictions * prevent applets from accessing that information. * <p/> * This will also cause an error if the sketch is not inited properly, * meaning that init() was never called on the PApplet when hosted * my some other main() or by other code. For proper use of init(), * see the examples in the main description text for PApplet. */ public String sketchPath(String where) { if (sketchPath() == null) { return where; } // isAbsolute() could throw an access exception, but so will writing // to the local disk using the sketch path, so this is safe here. // for 0120, added a try/catch anyways. try { if (new File(where).isAbsolute()) return where; } catch (Exception e) { } return sketchPath() + File.separator + where; } sketchPath() only works after setup(), you can't do
String path = sketchPath(); setup() { } Instead, you need to do:
String path; setup() { path = sketchPath(); } (Processing 3.5.4)
