WinUI3: How to capture wifi change event in WinUI3 desktop app

Question

WinUI3: How to capture wifi change event in WinUI3 desktop app

Anonymous

Hi,

I'm working on the WinUI3 desktop application. How can we receive an event when the network to which the system is connected to is changed?

I tried searching online, but I was not able to find any solutions to receive this event in WinUI3. It would be of great help if you could help me achieve this.

Thank you.

Answer 1

Junjie Zhu - MSFT 5,956 Microsoft Employee

Hello @Anonymous ,
Welcome to Microsoft Q&A!

You can use Event NetworkInformation.NetworkStatusChanged.

    public MainWindow()  
    {  
        this.InitializeComponent();  
        NetworkInformation.NetworkStatusChanged += NetworkStatusChanged;  
    }  

    private void NetworkStatusChanged(object sender)  
    {  
        Debug.WriteLine("NetworkStatusChanged");  
    }

I remember that your project is Winui3 C++, the following information is for your reference.
1.INetworkEvents::NetworkConnectivityChanged
The NetworkConnectivityChanged method is called when network connectivity related changes occur.
2.Receiving Event Notifications Through WMI

Thank you.
Junjie

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Anonymous

2023-01-06T07:23:22.997+00:00

Thank you so much for your response @Junjie Zhu - MSFT , Cant we use NetworkInformation.NetworkStatusChanged in WinUI3 desktop CPP app?
Junjie Zhu - MSFT 5,956 Reputation points Microsoft Employee

2023-01-06T07:36:19.947+00:00

No, you can use it in WinUI3 desktop CPP app, it a WinRT API.
Anonymous

2023-01-06T08:47:31.233+00:00

I was not able to find any documentation for its usage in CPP, can you please help me with an example for NetworkInformation.NetworkStatusChanged in CPP

Junjie Zhu - MSFT 5,956 Microsoft Employee

A small tip, you can switch the C++/winrt version in the document.
What qualifies as a connection state change event? this document details when this event occurs.

static event_token NetworkStatusChanged(NetworkStatusChangedEventHandler const& handler) const;  
  
// Revoke with event_token  
static void NetworkStatusChanged(event_token const* cookie) const;  
  
// Revoke with event_revoker  
static NetworkInformation::NetworkStatusChanged_revoker NetworkStatusChanged(auto_revoke_t, NetworkStatusChangedEventHandler const& handler) const;

Anonymous

NetworkStatusChangedEventHandler says it has one parameter which is IInspectable object.

i tried

        static void NetworkStatusChange(winrt::Windows::Foundation::IInspectable const& sender);

But it gave this error

 SYNC\PresentationFlowTest\PresentationFlowTest\Generated Files\winrt\Windows.Networking.Connectivity.h(2213,81): error C2297: '.*': not valid as right operand has type 'const M'

Anonymous

I was able to do it in C++ in like this

Windows::Networking::Connectivity::NetworkInformation info{};
info.NetworkStatusChanged([=](...) // sender is not super interesting in this type of event so I've not declared it
{
    // do your stuff here
    MessageBox(nullptr, L"Something Changed!", L"Network", 0);
});

WinUI3: How to capture wifi change event in WinUI3 desktop app

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