private IntPtr keyboardHandler(int nCode, IntPtr wParam, ref KBDLLHOOKSTRUCT kbdStruct)
{
IntPtr ret;
try
{
if (nCode >= 0)
{
var virtualKeyCode = (Keys) kbdStruct.KeyCode;
var keyData = BuildKeyData(virtualKeyCode);
var keyEventArgs = new KeyEventArgs(keyData);
var intParam = wParam.ToInt32();
switch (intParam)
{
case NativeMethods.WM_SYSKEYDOWN:
case NativeMethods.WM_KEYDOWN:
RaiseKeyDownEvent(keyEventArgs);
var buffer = ToUnicode(kbdStruct);
if (!string.IsNullOrEmpty(buffer))
{
foreach (var rawKey in buffer)
{
var s = _keyConverter.ConvertToString(rawKey);
if (s == null) continue;
var key = s[0];
RaiseKeyPressEvent(key);
}
}
break;
case NativeMethods.WM_SYSKEYUP:
case NativeMethods.WM_KEYUP:
RaiseKeyUpEvent(keyEventArgs);
break;
}
if(keyEventArgs.SuppressKeyPress) return new IntPtr(1);
}
}
finally
{
ret = NativeMethods.CallNextHookEx(_previousKeyboardHandler, nCode, wParam, ref kbdStruct);
}
return ret;
}
internal static extern IntPtr CallNextHookEx(SafeWinHandle hhk, int nCode, IntPtr wParam, ref KBDLLHOOKSTRUCT lParam);
internal static extern IntPtr CallNextHookEx(SafeWinHandle hhk, int nCode, IntPtr 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);
var success = NativeMethods.GetKeyboardState(keyState);
if(!success) return string.Empty;
var 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;
}