How to manually save/load different value trees?

Audio Plugins
1

Hi, I am aiming to create the ability to load and save presets manually in the form of value trees for my vst. I am already using getStateInformation and setStateInformation which appears to load and save the same xml file (I think). I would like to be able to save the current state into a new file with some type of identifier upon a button press, and then be able to load back in a state given an identifier with another button press.

How can I save a value tree state manually?
How can I choose the file path for the value tree state?
How can I load a specific value tree state manually?

Any help or insight is greatly appreciated!

2

If I’m not mistaken, you can read and write a value tree with something along the lines of (not tested) :

juce::File file("/path/to/file");

// writing
juce::ValueTree myValueTree{"someID"};
juce::FileOutputStream outstream(file);
myValueTree.writeToStream(outstream);

// reading
juce::FileInputStream in(file);
if (in.openedOk())
    auto newValueTree = juce::ValueTree::readFromStream(in);
1 Like
3

That was exactly what I was looking for, thank you!

4

The method above will save the ValueTree as binary data in the selected file. If you’d rather save it as XML, you can use something like:

juce::ValueTree myValueTree { "myID" };
juce::File myFile ("/Path/To/File");

// writing
if (auto xml = myValueTree.createXml())
    xml->writeTo (myFile);

// reading
if (auto xml = juce::XmlDocument::parse (myFile))
    myValueTree = juce::ValueTree::fromXml (*xml);
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