/// <summary>
/// Query DeviceInformation class for Midi Input devices
/// </summary>
private async Task EnumerateMidiInputDevices()
{
// Clear input devices
InputDevices.Clear();
InputDeviceProperties.Clear();
inputDeviceProperties.IsEnabled = false;
// Find all input MIDI devices
string midiInputQueryString = MidiInPort.GetDeviceSelector();
DeviceInformationCollection midiInputDevices = await DeviceInformation.FindAllAsync(midiInputQueryString);
// Return if no external devices are connected
if (midiInputDevices.Count == 0)
{
InputDevices.Add("No MIDI input devices found!");
inputDevices.IsEnabled = false;
NotifyUser("Please connect at least one external MIDI device for this demo to work correctly");
return;
}
// Else, add each connected input device to the list
foreach (DeviceInformation deviceInfo in midiInputDevices)
{
InputDevices.Add(deviceInfo.Name);
inputDevices.IsEnabled = true;
}
NotifyUser("MIDI Input devices found!");
}
/// <summary>
/// Change the active input MIDI device
/// </summary>
/// <param name="sender">Element that fired the event</param>
/// <param name="e">Event arguments</param>
private void inputDevices_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
// Get the selected input MIDI device
int selectedInputDeviceIndex = inputDevices.SelectedIndex;
// Try to display the appropriate device properties
if (selectedInputDeviceIndex < 0)
{
// Clear input device properties
InputDeviceProperties.Clear();
InputDeviceProperties.Add("Select a MIDI input device to view its properties");
inputDeviceProperties.IsEnabled = false;
NotifyUser("Select a MIDI input device to view its properties");
return;
}
DeviceInformationCollection devInfoCollection = _midiInDeviceWatcher.GetDeviceInformationCollection();
if (devInfoCollection == null)
{
InputDeviceProperties.Clear();
InputDeviceProperties.Add("Device not found!");
inputDeviceProperties.IsEnabled = false;
NotifyUser("Device not found!");
return;
}
DeviceInformation devInfo = devInfoCollection[selectedInputDeviceIndex];
if (devInfo == null)
{
InputDeviceProperties.Clear();
InputDeviceProperties.Add("Device not found!");
inputDeviceProperties.IsEnabled = false;
NotifyUser("Device not found!");
return;
}
// Display the found properties
DisplayDeviceProperties(devInfo, inputDeviceProperties, InputDeviceProperties);
NotifyUser("Device information found!");
}
/// <summary>
/// Clear all input and output MIDI device lists and properties
/// </summary>
private void ClearAllDeviceValues()
{
// Clear input devices
InputDevices.Clear();
InputDevices.Add("Click button to list input MIDI devices");
inputDevices.IsEnabled = false;
// Clear output devices
OutputDevices.Clear();
OutputDevices.Add("Click button to list output MIDI devices");
outputDevices.IsEnabled = false;
// Clear input device properties
InputDeviceProperties.Clear();
InputDeviceProperties.Add("Select a MIDI input device to view its properties");
inputDeviceProperties.IsEnabled = false;
// Clear output device properties
OutputDeviceProperties.Clear();
OutputDeviceProperties.Add("Select a MIDI output device to view its properties");
outputDeviceProperties.IsEnabled = false;
}