Hello
Is there some function in processing that goes and get the processing file location?
Like it would return the string C:/Users/USER/Documents/Processing/filename
This would be really helpful, cause like this i wouldnt be constantly having to change the code everytime i change computer or file location.

Any help would be greatly appreciated!

Use sketchPath() and dataPath() to get the location of the sketch and data folders.  Both take a string argument - the intention being that you're most likely to need the path to access a file.  Pass an empty string to get just the path; though I suspect this won't be necessary if you use them correctly:

Code:

String filename = "image.jpg";
// assuming the image is in your data folder:
String imagePath = dataPath(filename);
println(imagePath);
 

I guess that's documented over on the development reference?  I really should have a dig round that more often!