public void EnumerateKeyboards()
{
lock (_lock)
{
_keyboardList.Clear();
var rawKeyboardDevice = new RawKeyboardDevice("Global Keyboard", RawDeviceType.Keyboard, IntPtr.Zero, "Fake Keyboard. Some keys (ZOOM, MUTE, VOLUMEUP, VOLUMEDOWN) are sent to rawinput with a handle of zero.");
_keyboardList.Add(rawKeyboardDevice.Handle, rawKeyboardDevice);
uint devices = 0u;
int size = Marshal.SizeOf(typeof(RawInputDeviceList));
if (Win32Methods.GetRawInputDeviceList(IntPtr.Zero, ref devices, (uint)size) != 0u)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
IntPtr pRawInputDeviceList = Marshal.AllocHGlobal((int)(size * devices));
try
{
Win32Methods.GetRawInputDeviceList(pRawInputDeviceList, ref devices, (uint)size);
int index = 0;
while (index < devices)
{
RawKeyboardDevice device = GetKeyboard(pRawInputDeviceList, size, index);
if (device != null && !_keyboardList.ContainsKey(device.Handle))
{
_keyboardList.Add(device.Handle, device);
}
index++;
}
}
finally
{
Marshal.FreeHGlobal(pRawInputDeviceList);
}
NumberOfKeyboards = _keyboardList.Count;
}
}
internal RawInputKeyboardEventArgs(RawKeyboardDevice device, KeyPressState keyPressState, uint message, Key key, int virtualKey)
{
Device = device;
KeyPressState = keyPressState;
Message = message;
Key = key;
VirtualKey = virtualKey;
}