/// <summary>
/// Class constructor will fetch this object properties from HID sub system.
/// </summary>
/// <param name="hRawInputDevice">
/// Device Handle as provided by RAWINPUTHEADER.hDevice, typically accessed as
/// rawinput.header.hDevice
/// </param>
public HidDevice(IntPtr hRawInputDevice)
{
//Fetch various information defining the given HID device
Name = RawInput.GetDeviceName(hRawInputDevice);
//Open our device from the device name/path
var handle = Function.CreateFile(Name,
FileAccess.NONE,
FileShare.FILE_SHARE_READ | FileShare.FILE_SHARE_WRITE,
IntPtr.Zero,
CreationDisposition.OPEN_EXISTING,
FileFlagsAttributes.FILE_FLAG_OVERLAPPED,
IntPtr.Zero
);
if (handle.IsInvalid)
{
Debug.WriteLine("Failed to CreateFile from device name " + Marshal.GetLastWin32Error());
}
else
{
//Get manufacturer string
var manufacturerString = new StringBuilder(256);
if (Function.HidD_GetManufacturerString(handle, manufacturerString, manufacturerString.Capacity))
{
Manufacturer = manufacturerString.ToString();
}
//Get product string
var productString = new StringBuilder(256);
if (Function.HidD_GetProductString(handle, productString, productString.Capacity))
{
Product = productString.ToString();
}
//Get attributes
var attributes = new HIDD_ATTRIBUTES();
if (Function.HidD_GetAttributes(handle, ref attributes))
{
VendorId = attributes.VendorID;
ProductId = attributes.ProductID;
Version = attributes.VersionNumber;
}
handle.Close();
}
}
public static extern Boolean HidD_GetAttributes(SafeFileHandle HidDeviceObject, ref HIDD_ATTRIBUTES Attributes);