Can a library save and retrieve a configuration file?


I've made a small library to export video. The library asks you to indicate where ffmpeg is found. It would be great if it could save that info so it does not ask you for each new sketch. Currently it saves a text file for each sketch.

I've seen libraries can have a data folder, and can read from it. Can you also write to it?


  • Sure. What happened when you tried?

  • edited January 2015

    How do you locate the libraries' data folder from the libraries code? sketchPath() gives you the sketch path. Is there a libraryPath()?

  • edited January 2015

    Wouldn't it just be sketchPath("data")? More discussion here:

    There is also the dataPath() function:

    (I found both of those links by simply googling "Processing sketchPath")

    Also, you might want to be careful with this. For example, if somebody deploys their sketch as a runnable jar, you won't be able to write to the jar.

  • Maybe I should rephrase my question to "Can a library save and retrieve a unique configuration file?". I'd like to avoid having one configuration file per sketch (that I'm already doing).

    I could for instance save a file to the users' home folder... but I wanted to know, since you can read data from the library's data folder, if there's a way to write to it. If you do sketchPath("data") you obviously get the sketches data folder, which is not what I'm after.

  • edited January 2015

    It looks like a good solution is to use the Preferences API, to let Java decide where to store those settings on each OS.

  • edited January 2015

    I've seen libraries can have a data folder, and can read from it. Can you also write to it?

    The thing to do is to have the library manage the loading and saving of the configuration file that way the sketch does not need to know where the library data folder is located.

  • Thanks, I think using the Preferences API as I mentioned above is even better, because I don't even need to know where the settings are saved. Java and the OS take care of that.

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