private IntPtr KeyboardHookProc(int nCode, IntPtr wParam, IntPtr lParam)
{
var keyboardMessage = (WinAPI.USER32.WM)wParam;
bool intercept = false;
if (Status == DeviceHookStatus.Active)
{
ThreadPriority oldPriority = Thread.CurrentThread.Priority;
try {
Thread.CurrentThread.Priority = ThreadPriority.Highest;
// it was ok and someone listens to events
if (nCode >= 0)
{
var keyData = (WinAPI.USER32.KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(WinAPI.USER32.KeyboardHookStruct));
// Determine key
var virtualKey = (VirtualKey)keyData.vkCode;
var key = Tools.WinTool.VirtualKeyToKey(virtualKey);
var scanCode = (ScanCode)keyData.scanCode;
var asciiChar = DetermineASCIIKeyPressed(keyData);
// Determine key state
var keyState = KeyState.Unknown;
if (keyboardMessage == WinAPI.USER32.WM.KEYDOWN || keyboardMessage == WinAPI.USER32.WM.SYSKEYDOWN)
{
keyState = KeyState.Down;
}
else if (keyboardMessage == WinAPI.USER32.WM.KEYUP || keyboardMessage == WinAPI.USER32.WM.SYSKEYUP)
{
keyState = KeyState.Up;
}
if (InterceptKeys.Contains(key))
{
intercept = true;
}
// Base method will process rest of logic
base.ContinueOutsideCriticalExecutionContext(
() =>
base.ProcessKeyEvent(
asciiChar,
key,
scanCode,
keyState,
virtualKey.HasFlag(VirtualKey.Shift),
virtualKey.HasFlag(VirtualKey.Control),
virtualKey.HasFlag(VirtualKey.A)
)
);
}
} finally {
Thread.CurrentThread.Priority = oldPriority;
}
}
if (intercept)
{
return(new IntPtr(-1));
}
return(WinAPI.USER32.CallNextHookEx(_hKeyboardHook, nCode, wParam, lParam));
}