/// <summary>
/// Initializes a new instance of the <see cref="InputDevice"/> class with the specified <see cref="DeviceDescriptor"/> and parent <see cref="DeviceManager"/>
/// </summary>
/// <param name="descriptor">Describes the HID compliant device to open a connection to</param>
/// <param name="manager">The parent <see cref="DeviceManager"/> of this <see cref="InputDevice"/></param>
public InputDevice(DeviceDescriptor descriptor, DeviceManager manager)
{
this.descriptor = descriptor;
this.manager = manager;
Open();
// If the device succeeded in opening, get the attributes and capabilities
if (open)
{
Connected = true;
WindowsNative.HIDD_ATTRIBUTES attr = new WindowsNative.HIDD_ATTRIBUTES();
attr.Size = Marshal.SizeOf(attr);
WindowsNative.HidD_GetAttributes(hid, ref attr);
capabilities = default(WindowsNative.HIDP_CAPS);
IntPtr ptr = default(IntPtr);
// This shouldn't fail, but no big deal if it does
// The device will just end up getting garbage collected if it has invalid vid/pid
if (WindowsNative.HidD_GetPreparsedData(hid, ref ptr))
{
WindowsNative.HidP_GetCaps(ptr, ref capabilities);
WindowsNative.HidD_FreePreparsedData(ptr);
}
Close();
this.descriptor.SetIDSFromAttributes(attr);
}
}
/// <summary>
/// Populates <see cref="VendorID"/> and <see cref="ProductID"/> from a given <see cref="WindowsNative.HIDD_ATTRIBUTES"/>
/// </summary>
/// <param name="attr">The struct containing the product and vendor IDs to set</param>
public void SetIDSFromAttributes(WindowsNative.HIDD_ATTRIBUTES attr)
{
VendorID = attr.VendorID;
ProductID = attr.ProductID;
}
