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c#winapiaudionotificationsusb
Robert Oschler
Robert Oschler

Reputation: 14375

Receive notification in C# app when a new USB audio device is connected or disconnected?

I have a C# Windows Forms app that runs on Windows 8.1 or newer and does speech recognition. I want to be notified when a new USB audio input device is connected to the system. I am hoping there is a notification service in the Windows API that will tell me when and audio device is connected to the system or disconnected from the system.

Is there such a notification available, or do I have constantly rescan the available audio input devices and create my own notifications when I detect a change? I'd obviously don't want to reinvent the wheel.

Upvotes: 2

Views: 1457

Answers (1)

Tyler Zale
Tyler Zale

Reputation: 634

The following will listen for USB plug-in/turn-on un-plug/turn-off at a scan rate of 2seconds intervals

        //turn on USB device event
        WqlEventQuery q_creation = new WqlEventQuery();
        q_creation.EventClassName = "__InstanceCreationEvent";
        q_creation.WithinInterval = new TimeSpan(0, 0, 2);
        q_creation.Condition = @"TargetInstance ISA 'Win32_USBControllerdevice'";
        mwe_creation = new ManagementEventWatcher(q_creation);
        mwe_creation.EventArrived += new EventArrivedEventHandler(USBEventArrived_Creation);
        mwe_creation.Start();

        //turn off USB device event
        WqlEventQuery q_deletion = new WqlEventQuery();
        q_deletion.EventClassName = "__InstanceDeletionEvent";
        q_deletion.WithinInterval = new TimeSpan(0, 0, 2);
        q_deletion.Condition = @"TargetInstance ISA 'Win32_USBControllerdevice'  ";
        mwe_deletion = new ManagementEventWatcher(q_deletion);
        mwe_deletion.EventArrived += new EventArrivedEventHandler(USBEventArrived_Deletion);
        mwe_deletion.Start();    

        private void USBEventArrived_Creation(object sender, EventArrivedEventArgs e)
        {
        }

        private void USBEventArrived_Deletion(object sender, EventArrivedEventArgs e)
        {
        }

Upvotes: 3

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