private static void Refresh(object o)
{
var indicators = new KEYBOARD_INDICATOR_PARAMETERS();
int buffer_size = (int)Marshal.SizeOf(indicators);
var led_vk = Settings.LedKey.Value[0].VirtualKey;
// NOTE: I was unable to make IOCTL.KEYBOARD_QUERY_INDICATORS work
// properly, but querying state with GetKeyState() seemed more
// robust anyway. Think of the user setting Caps Lock as their
// compose key, entering compose state, then suddenly changing
// the compose key to Shift: the LED state would be inconsistent.
foreach (var kv in m_vk_to_flag)
{
var vk = kv.Key;
var flag = kv.Value;
if (NativeMethods.GetKeyState(vk) != 0)
{
indicators.LedFlags |= flag;
}
else if (Composer.IsComposing)
{
if (Composer.CurrentComposeKey.VirtualKey == vk && led_vk == VK.COMPOSE ||
led_vk == vk)
{
indicators.LedFlags |= flag;
}
}
}
lock (m_kbd_devices)
{
foreach (ushort id in m_kbd_devices)
{
indicators.UnitId = id;
using (var handle = NativeMethods.CreateFile($@"\\.\dos_kbd{id}",
FileAccess.Write, FileShare.Read, IntPtr.Zero,
FileMode.Open, FileAttributes.Normal, IntPtr.Zero))
{
int bytesReturned;
NativeMethods.DeviceIoControl(handle, IOCTL.KEYBOARD_SET_INDICATORS,
ref indicators, buffer_size,
IntPtr.Zero, 0, out bytesReturned,
IntPtr.Zero);
}
}
}
}
public static void UpdateKeyboardLeds(object sender, EventArgs e)
{
var indicators = new KEYBOARD_INDICATOR_PARAMETERS();
int buffer_size = (int)Marshal.SizeOf(indicators);
// NOTE: I was unable to make IOCTL.KEYBOARD_QUERY_INDICATORS work
// properly, but querying state with GetKeyState() seemed more
// robust anyway. Think of the user setting Caps Lock as their
// compose key, entering compose state, then suddenly changing
// the compose key to Shift: the LED state would be inconsistent.
if (NativeMethods.GetKeyState(VK.CAPITAL) != 0 ||
(m_composing && Settings.ComposeKey.Value.VirtualKey == VK.CAPITAL))
{
indicators.LedFlags |= KEYBOARD.CAPS_LOCK_ON;
}
if (NativeMethods.GetKeyState(VK.NUMLOCK) != 0 ||
(m_composing && Settings.ComposeKey.Value.VirtualKey == VK.NUMLOCK))
{
indicators.LedFlags |= KEYBOARD.NUM_LOCK_ON;
}
if (NativeMethods.GetKeyState(VK.SCROLL) != 0 ||
(m_composing && Settings.ComposeKey.Value.VirtualKey == VK.SCROLL))
{
indicators.LedFlags |= KEYBOARD.SCROLL_LOCK_ON;
}
for (ushort i = 0; i < 4; ++i)
{
indicators.UnitId = i;
using (var handle = NativeMethods.CreateFile(@"\\.\" + "dos_kbd" + i.ToString(),
FileAccess.Write, FileShare.Read, IntPtr.Zero,
FileMode.Open, FileAttributes.Normal, IntPtr.Zero))
{
int bytesReturned;
NativeMethods.DeviceIoControl(handle, IOCTL.KEYBOARD_SET_INDICATORS,
ref indicators, buffer_size,
IntPtr.Zero, 0, out bytesReturned,
IntPtr.Zero);
}
}
}
public static extern bool DeviceIoControl(SafeFileHandle hDevice, IOCTL IoControlCode,
IntPtr InBuffer, int nInBufferSize, out KEYBOARD_INDICATOR_PARAMETERS OutBuffer,
int nOutBufferSize, out int pBytesReturned, IntPtr Overlapped);
public static void UpdateKeyboardLeds(object sender, EventArgs e)
{
var indicators = new KEYBOARD_INDICATOR_PARAMETERS();
int buffer_size = (int)Marshal.SizeOf(indicators);
// NOTE: I was unable to make IOCTL.KEYBOARD_QUERY_INDICATORS work
// properly, but querying state with GetKeyState() seemed more
// robust anyway. Think of the user setting Caps Lock as their
// compose key, entering compose state, then suddenly changing
// the compose key to Shift: the LED state would be inconsistent.
if (NativeMethods.GetKeyState(VK.CAPITAL) != 0
|| (IsComposing() && Settings.ComposeKey.Value.VirtualKey == VK.CAPITAL))
indicators.LedFlags |= KEYBOARD.CAPS_LOCK_ON;
if (NativeMethods.GetKeyState(VK.NUMLOCK) != 0
|| (IsComposing() && Settings.ComposeKey.Value.VirtualKey == VK.NUMLOCK))
indicators.LedFlags |= KEYBOARD.NUM_LOCK_ON;
if (NativeMethods.GetKeyState(VK.SCROLL) != 0
|| (IsComposing() && Settings.ComposeKey.Value.VirtualKey == VK.SCROLL))
indicators.LedFlags |= KEYBOARD.SCROLL_LOCK_ON;
for (ushort i = 0; i < 4; ++i)
{
indicators.UnitId = i;
using (var handle = NativeMethods.CreateFile(@"\\.\" + "dos_kbd" + i.ToString(),
FileAccess.Write, FileShare.Read, IntPtr.Zero,
FileMode.Open, FileAttributes.Normal, IntPtr.Zero))
{
int bytesReturned;
NativeMethods.DeviceIoControl(handle, IOCTL.KEYBOARD_SET_INDICATORS,
ref indicators, buffer_size,
IntPtr.Zero, 0, out bytesReturned,
IntPtr.Zero);
}
}
}
public static extern bool DeviceIoControl(SafeFileHandle hDevice, IOCTL IoControlCode,
IntPtr InBuffer, int nInBufferSize, out KEYBOARD_INDICATOR_PARAMETERS OutBuffer,
int nOutBufferSize, out int pBytesReturned, IntPtr Overlapped);
