/// <summary>
/// This method will filter the messages that are passed for USB device change messages only.
/// And parse them and take the appropriate action
/// </summary>
/// <param name="msg">
/// The Message.
/// </param>
/// <param name="windowParam">
/// The w parameter.
/// </param>
/// <param name="pointerParam">
/// The pointer parameter.
/// </param>
public static void ParseMessages(int msg, IntPtr windowParam, IntPtr pointerParam)
{
// we got a device change message! A USB device was inserted or removed
if (!msg.Equals(NativeMethods.WindowsMessageDeviceChange) ||
UsbChangedEvent == null ||
windowParam == IntPtr.Zero ||
pointerParam == IntPtr.Zero)
{
return;
}
var di =
(NativeMethods.DevBroadcastDeviceInterface)
Marshal.PtrToStructure(pointerParam, typeof(NativeMethods.DevBroadcastDeviceInterface));
if (string.IsNullOrEmpty(di.Path))
{
return;
}
if (di.ClassGuid.Equals(NativeMethods.WinUsbGuid))
{
// WinUSB Device.
// force the information to always be non null.
CurrentState.Information =
UsbHelpers.GetWinUsbAddresses(di.Path, UsbHelpers.FilterTypes.DeviceName)
.FirstOrDefault()
.Information ?? new HidInformation();
}
else
{
// Non WinUSB device.
// force the information to always be non null.
CurrentState.Information =
UsbHelpers.GetHidAddresses(di.Path, UsbHelpers.FilterTypes.DeviceName).FirstOrDefault().Information
?? new HidInformation();
}
CurrentState.Path = di.Path;
// Check the window parameter to see if a device was inserted or removed
switch (windowParam.ToInt64())
{
// inserted
case NativeMethods.DeviceArrival:
CurrentState.State = UsbStates.Arrived;
break;
// removed
case NativeMethods.DeviceRemoveComplete:
CurrentState.State = UsbStates.Removed;
break;
default:
return;
}
UsbChangedEvent.RaiseEvent(null, CurrentState);
}
public static void Main()
{
const short VendorId = 0x45e;
const byte TackpadUsage = 0x05;
const byte MaxContactFeatureReportId = 0x05;
const string HostAddress = "localhost";
// find the Hid device path to the Precision Trackpad.
var trackpadPath = UsbHelpers.GetHidAddresses(VendorId, UsbHelpers.FilterTypes.VendorId)
.FirstOrDefault(x => x.Information.Usage == TackpadUsage).DevicePath;
if (string.IsNullOrEmpty(trackpadPath))
{
Console.WriteLine("Cannot find PTP Trackpad.");
return;
}
// create our buffers to store the repsonses from the feature calls.
byte[] featureHid;
byte[] featureNet = { 1, 2, 3 };
using (var hid = new HidTransportBase(trackpadPath))
{
if (!hid.Connect())
{
Console.WriteLine("Failed to connect to PTP device.");
return;
}
// get the feature report Over the hid transport.
featureHid = hid.GetFeature(MaxContactFeatureReportId);
// initialize and start our remote parser.
// this allows remote communications from other clients to
// our hid transport.
var remote = new Remote(hid);
remote.Start();
// initalize our network transport.
using (var network = new NetworkTransport(HostAddress, Remote.PortNumber))
{
// connect to our runnign remote parser.
if (network.Connect())
{
// get the feature report Over the network transport.
featureNet = network.GetFeature(MaxContactFeatureReportId);
}
}
}
// check that the two responses are equal.
Console.WriteLine("Test {0}....", featureNet.SequenceEqual(featureHid) ? "Passed" : "Failed");
Console.ReadKey(true);
}