internal static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam);
public DeadKeyInfo(KBDLLHOOKSTRUCT info, byte[] keyState)
{
KeyCode = (Keys)info.KeyCode;
ScanCode = info.ScanCode;
KeyboardState = keyState;
}
private static string ToUnicode(KBDLLHOOKSTRUCT info)
{
string result = null;
var keyState = new byte[256];
var buffer = new StringBuilder(128);
NativeMethods.GetKeyboardState(keyState);
bool isAltGr = IsKeyPressed(NativeMethods.VK_RMENU) && IsKeyPressed(NativeMethods.VK_LCONTROL);
if (isAltGr) keyState[NativeMethods.VK_LCONTROL] = keyState[NativeMethods.VK_LALT] = 0x80;
var layout = GetForegroundKeyboardLayout();
var count = ToUnicode((Keys)info.KeyCode, info.ScanCode, keyState, buffer, layout);
if (count > 0)
{
result = buffer.ToString(0, count);
if (_lastDeadKey != null)
{
ToUnicode(_lastDeadKey.KeyCode,
_lastDeadKey.ScanCode,
_lastDeadKey.KeyboardState,
buffer,
layout);
_lastDeadKey = null;
}
}
else if (count < 0)
{
_lastDeadKey = new DeadKeyInfo(info, keyState);
while (count < 0)
{
count = ToUnicode(Keys.Decimal, buffer, layout);
}
}
return result;
}
private IntPtr keyboardHandler(int nCode, int wParam, ref KBDLLHOOKSTRUCT kbdStruct)
{
if (nCode >= 0)
{
Keys virtualKeyCode = (Keys)kbdStruct.KeyCode;
Keys keyData = BuildKeyData(virtualKeyCode);
var keyEventArgs = new KeyEventArgs(keyData);
if (wParam == NativeMethods.WM_KEYDOWN || wParam == NativeMethods.WM_SYSKEYDOWN)
{
RaiseKeyDownEvent(keyEventArgs);
string buffer = ToUnicode(kbdStruct);
if (!string.IsNullOrEmpty(buffer))
{
foreach (var rawKey in buffer)
{
var key = _keyConverter.ConvertToString(rawKey)[0];
RaiseKeyPressEvent(key);
}
}
}
else if (wParam == NativeMethods.WM_KEYUP || wParam == NativeMethods.WM_SYSKEYUP)
{
Debug.Print("Release({0})", (int)virtualKeyCode);
RaiseKeyUpEvent(keyEventArgs);
}
}
return NativeMethods.CallNextHookEx(this._previousKeyboardHandler, nCode, wParam, ref kbdStruct);
}
internal static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam);
