Any way to save URL into ValueTree on iOS?

MacOSX and iOS
1

I’m using URL to open local file directly following official documents, everything works pretty well, but it can’t get called when I save and re-open the project. It seems like I saved the URL wrong by converting it to a string and save it into a property of the valuetree.

My question is is there any way to directly save the URL into valueTreeState so next time it can get recalled automatically? Thanks in advance!!!

1 Like
2

Can you share the code how you set and retrieve the URL to and from the property?
This should be pretty painless and is the recommended way.

1 Like
3

Ok, sorry for my ignorance. Here’s how I did it:

mFilePathURL is a URL, I put it into my valueTreeState,

mAPVTS.state.setProperty("currentFilePath", mFilePathURL.toString(true), nullptr);

then I get it in getStateInformation and recover it:

void HelloSamplerAudioProcessor::getStateInformation (juce::MemoryBlock& destData)
{
    juce::MemoryOutputStream mos(destData, true);
    mAPVTS.state.writeToStream(mos);
}

void HelloSamplerAudioProcessor::setStateInformation (const void* data, int sizeInBytes)
{
    auto tree = juce::ValueTree::readFromData(data, sizeInBytes);
    
    if( tree.isValid() )
    {
        mAPVTS.replaceState(tree);
        
        auto filePath = mAPVTS.state.getProperty("currentFilePath", "").toString();
        if(filePath.isNotEmpty())
        {
            auto filePathURL = juce::URL(filePath);
            HelloSamplerAudioProcessor::loadFile (filePathURL);
        }
    }
}

Everything works fine on Mac and PC, only on iOS, it cannot recall properly when re-open the saved project.

4

That looks good to me.

I think you can use mFilePathURL.toString(false), since for a local file get-parameters are pretty useless.

Can you check in the debugger what the string is when you read in setStateInformation?

5

This is the string when I setProperty:

file:///private/var/mobile/Containers/Data/Application/214BBBE9-4839-4A2D-9E17-F304BA3F692A/Documents/songs/20201205-lofi%20test/sampler/1.wav

(I don’t know how to debug and get the setStateInformation string after kill and re-open the DAW :joy:)

6

It could be related to sandboxing… not sure if the GUID is the same after a rebuild and such…

I’ll have to pass on to someone with more iOS experience, since it’s likely platform related.
The URL is there, but I don’t know if the location is there where it points to.

7

Seems you got the answer in your other thread:

8

Yeah, but not sure if it works, I’ll try it later, thanks for the help!