internal static HIDDeviceInfo GetDevice(string hidPath)
{
bool result;
HIDDeviceInfo hid = new HIDDeviceInfo();
hid.DIDetail.DevicePath = hidPath;
// Open the device handle
if (!hid.OpenHandle())
{
return(null);
}
// Get the attributes of the current device
result = NativeMethods.HidD_GetAttributes(hid.Handle.DangerousGetHandle(), ref hid.HIDAttr);
// Close the device before returning in
// case the user doesn't want it afterall.
hid.Close();
if (result)
{
return(hid);
}
// Otherwise this isn't an HID device
return(null);
}
internal static IEnumerable <HIDDeviceInfo> EnumerateDevices(CancellationToken token, Predicate <HIDDeviceInfo> match)
{
IntPtr hDevInfo = IntPtr.Zero;
try {
int index = -1;
bool result;
int size;
HIDDeviceInfo hid;
// Create a new interface data struct and initialize its size
SP_DEVICE_INTERFACE_DATA diData = new SP_DEVICE_INTERFACE_DATA();
diData.cbSize = Marshal.SizeOf <SP_DEVICE_INTERFACE_DATA>();
// Get a handle to all devices that are part of the HID class
// Fun fact: DIGCF_PRESENT worked on my machine just fine. I reinstalled Vista, and now it no longer finds the Wiimote with that parameter enabled...
hDevInfo = NativeMethods.SetupDiGetClassDevs(ref HIDGuid, null, IntPtr.Zero, DeviceInfoFlags.DeviceInterface); // | DeviceInfoFlags.Present);
while (NativeMethods.SetupDiEnumDeviceInterfaces(hDevInfo, IntPtr.Zero, ref HIDGuid, ++index, ref diData))
{
hid = new HIDDeviceInfo(diData);
size = 0;
if (token.IsCancellationRequested)
{
yield break;
}
// Get the buffer size for this device detail instance (returned in the size parameter)
NativeMethods.SetupDiGetDeviceInterfaceDetail(hDevInfo, ref hid.DIData, IntPtr.Zero, 0, out size, IntPtr.Zero);
// Actually get the detail struct
if (!NativeMethods.SetupDiGetDeviceInterfaceDetail(hDevInfo, ref hid.DIData, ref hid.DIDetail, size, out size, IntPtr.Zero))
{
continue;
}
//Debug.WriteLine(string.Format("{0}: {1} - {2}", index, hid.Path, Marshal.GetLastWin32Error()));
// Open the device handle
if (!hid.OpenHandle())
{
continue;
}
result = NativeMethods.HidD_GetAttributes(hid.DangerousHandle, ref hid.HIDAttr);
// Close the device before returning in
// case the user doesn't want it afterall.
hid.Close();
if (result && (match?.Invoke(hid) ?? true))
{
yield return(hid);
}
}
}
finally {
// clean up our list
if (hDevInfo != IntPtr.Zero)
{
NativeMethods.SetupDiDestroyDeviceInfoList(hDevInfo);
}
}
}
