microsoft--powertoys/doc/devdocs/modules/launcher/plugins/onenote.md

OneNote Plugin

The OneNote plugin searches your locally synced OneNote notebooks based on the user query.

The code itself is very simple, basically just a call into OneNote interop via the https://github.com/scipbe/ScipBe-Common-Office library.

var pages = OneNoteProvider.FindPages(query.Search);

The query results will be cached for 1 day, and if cached results are found they'll be returned in the initial Query() call; otherwise, OneNote itself will be queried in the delayedExecution:true overload.

If the user actions on a result, it'll open it in the OneNote app, and restore and/or focus the app as well if necessary.

if (PInvoke.IsIconic(handle))
{
    PInvoke.ShowWindow(handle, SHOW_WINDOW_CMD.SW_RESTORE);
}

PInvoke.SetForegroundWindow(handle);

The plugin attempts to call the library in the constructor, and if it fails with a COMException then it'll note that OneNote isn't available and not attempt to query it again.

try
{
    _ = OneNoteProvider.PageItems.Any();
    _oneNoteInstalled = true;
}
catch (COMException)
{
    // OneNote isn't installed, plugin won't do anything.
    _oneNoteInstalled = false;
}