yTorqueChecker/AppShell.xaml.cs at master · yoctopuce-examples/yTorqueChecker · GitHub

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using System;
using System.Diagnostics;

namespace yTorqueChecker
{
    public partial class AppShell : Shell
    {

        public AppShell()
        {
            InitializeComponent();
        }

        protected override void OnAppearing()
        {
            base.OnAppearing();
            string errmsg = "";
            int res = YAPI.RegisterHub("usb", ref errmsg);
            if (res != YAPI.SUCCESS) {
                string error = "Unable to registerHub(usb) : " + errmsg;
                Debug.WriteLine(error);
                MainThread.BeginInvokeOnMainThread(async () =>
                {
                    await Task.Delay(1000);
                    await Shell.Current.DisplayAlert("Error", error, "Quit");
                    Application.Current.Quit();
                });
            }
        }


        protected override void OnDisappearing()
        {
            base.OnDisappearing();
            YAPI.UnregisterHub("usb");
        }
    }
}