private IntPtr HookProc(Int32 nCode, IntPtr wParam, KeyboardLowLevelHookInfo info)
{
if (nCode == 0)
{
var args = new KeyEventArgs(info.KeyData);
var handler = SendKeyDown;
if (info.IsKeyUp)
{
handler = SendKeyUp;
}
SynchronizationContext.Current.Send(handler, args);
if (info.IsKeyDown && !args.SuppressKeyPress && Events[KeyPressEvent] != null)
{
string str = ToUnicode(info);
if (!string.IsNullOrEmpty(str))
{
foreach (char ch in str)
{
SynchronizationContext.Current.Send(SendKeyPress, new KeyPressEventArgs(ch));
}
}
}
if (args.Handled)
{
return(new IntPtr(-1));
}
}
return(NativeMethods.CallNextHookEx(IntPtr.Zero, nCode, wParam, info));
}
public DeadKeyInfo(KeyboardLowLevelHookInfo info, byte[] keyState)
{
KeyCode = info.KeyCode;
ScanCode = info.ScanCode;
KeyboardState = keyState;
}
private static string ToUnicode(KeyboardLowLevelHookInfo info)
{
string result = null;
var keyState = new byte[256];
var buffer = new StringBuilder(128);
if (!NativeMethods.GetKeyboardState(keyState))
{
throw Marshal.GetExceptionForHR(Marshal.GetHRForLastWin32Error());
}
var layout = GetForegroundKeyboardLayout();
var count = ToUnicode(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);
}
