System.InvalidCastException: Unable to cast object of type 'System.IntPtr' to type 'Gio.File[]'.

[nlogozzo]

I have the following code, meant to implement Gio.ApplicationFlags.HandlesOpen:

/// <summary>
/// Occurs when the application is opened via dbus
/// </summary>
/// <param name="sender">Gio.Application</param>
/// <param name="e">Gio.Application.OpenSignalArgs</param>
private void OnOpen(Gio.Application sender, Gio.Application.OpenSignalArgs e)
{
    _mainWindowController.UrlToLaunch = e.Files[0].GetUri();
    _application.Activate();
}

We are trying to open the app via dbus, passing a URL to the app:

#!/usr/bin/env python3

import dbus

if __name__ == "__main__":
    bus = dbus.SessionBus()
    proxy = bus.get_object(
        "org.nickvision.tubeconverter", "/org/nickvision/tubeconverter"
    )
    open = proxy.get_dbus_method("Open", "org.freedesktop.Application")
    open(["https://youtu.be/8eXj97stbG8"], {})

When this method hits, we get the error:

UnhandledException - unhandled exception: System.InvalidCastException: Unable to cast object of type 'System.IntPtr' to type 'Gio.File[]'.
   at GObject.Value.Extract[T]()
   at Gio.Application.OpenSignalArgs.get_Files()
   at NickvisionTubeConverter.GNOME.Program.OnOpen(Application sender, OpenSignalArgs e) in /run/build/org.nickvision.tubeconverter/NickvisionTubeConverter.GNOME/Program.cs:line 122
   at GObject.Signal`2.<>c__DisplayClass11_0.<Connect>b__0(Value returnValue, Value[] parameters)
   at GObject.Closure.InternalCallback(IntPtr closure, IntPtr returnValuePtr, UInt32 nParamValues, ValueData[] paramValuesData, IntPtr invocationHint, IntPtr userData)

How should we be handling this correctly?

[badcel]

Duplicate of #958.