/// <summary>
/// Creates global keyboard listener.
/// </summary>
internal KeyboardListener()
{
// Dispatcher thread handling the KeyDown/KeyUp events.
_dispatcher = Dispatcher.CurrentDispatcher;
// We have to store the LowLevelKeyboardProc, so that it is not garbage collected runtime
_hookProcDelegateToAvoidGC = LowLevelKeyboardProc;
// Set the hook
_hookId = InterceptKeys.SetHook(_hookProcDelegateToAvoidGC);
// Assign the asynchronous callback event
_hookedKeyboardCallbackAsync = KeyboardListener_KeyboardCallbackAsync;
}
private IntPtr LowLevelKeyboardProc(int nCode, UIntPtr wParam, IntPtr lParam)
{
if (nCode >= 0)
{
if (wParam.ToUInt32() == (int)InterceptKeys.KeyEvent.WM_KEYDOWN ||
wParam.ToUInt32() == (int)InterceptKeys.KeyEvent.WM_KEYUP ||
wParam.ToUInt32() == (int)InterceptKeys.KeyEvent.WM_SYSKEYDOWN ||
wParam.ToUInt32() == (int)InterceptKeys.KeyEvent.WM_SYSKEYUP)
{
// Captures the character(s) pressed only on WM_KEYDOWN
var chars = InterceptKeys.VkCodeToString((uint)Marshal.ReadInt32(lParam),
(wParam.ToUInt32() == (int)InterceptKeys.KeyEvent.WM_KEYDOWN ||
wParam.ToUInt32() == (int)InterceptKeys.KeyEvent.WM_SYSKEYDOWN));
_hookedKeyboardCallbackAsync.BeginInvoke((InterceptKeys.KeyEvent)wParam.ToUInt32(), Marshal.ReadInt32(lParam), chars, null, null);
}
}
return(InterceptKeys.CallNextHookEx(_hookId, nCode, wParam, lParam));
}
/// <summary>
/// Disposes the hook.
/// <remarks>This call is required as it calls the UnhookWindowsHookEx.</remarks>
/// </summary>
public void Dispose()
{
InterceptKeys.UnhookWindowsHookEx(_hookId);
}