Getting Started

[manudev-1]

Hi guys, im trying to explore the word of BLE and Bluetooth,
and i want to realize a basic MAUI application which has just one button and when the user press the button the application scan the near Bluetooth devices and show them in a list in the application.

I think i have setted everything that should be setted (Permissions) and downloaded everything correctly.

So I find this amazing Library and take a look at the documentation:

I copied this code on my application but as i was thinking it throw an exception:
System.NullReferenceException: 'Object reference not set to an instance of an object.'

How can i resolve this little problem?

[aritchie]

You can't just copy & paste it, the bleManager doesn't get set. You have to inject or resolve it using dependency injection.

You can use if you don't know how to use dependency injection.

var ble = Shiny.Hosting.Host.GetService<IBleManager>();

[manudev-1]

Thank you for your answer, I tryed this code in the sequent way:

using Shiny.BluetoothLE;
using Shiny.Hosting;

namespace BLE_Dev
{
    public partial class MainPage : ContentPage
    {        
        public MainPage()
        {
            InitializeComponent();
        }

        private void btnScan_Clicked(object sender, EventArgs e)
        {
            var manager = Host.GetService<IBleManager>();
            var scanner = manager.Scan().Subscribe(scanResult =>
            {
                Label label = new Label();
                label.Text = scanResult.Peripheral.Name;
                Devices.Add(label);
            });
        }
    }
}

But when i press the button it still gives me the error:
System.NullReferenceException: 'Object reference not set to an instance of an object.'

did i miss something?

[aritchie]

No idea. You've given me the absolute bare minimum to help you. There is a whole setup document to follow and a code gen page you can use on shinylib.net

[manudev-1]

Sorry for this, i think i'll try to resolve the problem by myself, thank you anyway. have a nice day 😄

[aritchie]

just share a github link or something. I'll look, but I need info