private int LowLevelKeyboardProc(int nCode, Int32 wParam, IntPtr lParam)
{
KeyboardEvent?keyboardEvent;
if (nCode >= 0 && (keyboardEvent = GetKeyboardEvent(lParam)) != null)
{
var vkCode = keyboardEvent.vkCode;
switch (wParam)
{
case WM_KEYDOWN:
case WM_SYSKEYDOWN:
{
var count = _eventDict.GetValueOrDefault(vkCode, 0) + 1;
_eventDict[vkCode] = count;
if (count == 1)
{
AddModifier(vkCode);
KeyDown?.Invoke(keyboardEvent);
}
else
{
KeyType?.Invoke(keyboardEvent);
}
// 锁定Windows以后就收不到事件了
if (keyboardEvent.code == LOCK_SHORTCUT)
{
foreach (var(_vkCode, _) in _eventDict)
{
RemoveModifier(_vkCode);
KeyUp?.Invoke(new KeyboardEvent(_vkCode, _modifiers));
}
_eventDict.Clear();
}
break;
}
case WM_KEYUP:
case WM_SYSKEYUP:
// 解锁Windows以后收到事件就丢弃掉
if (_eventDict.Count == 0)
{
_modifiers = 0;
break;
}
RemoveModifier(vkCode);
_eventDict.Remove(vkCode);
KeyUp?.Invoke(keyboardEvent);
break;
}
}
// 如果返回1，则结束消息，这个消息到此为止，不再传递。
// 如果返回0或调用CallNextHookEx函数则消息出了这个钩子继续往下传递，也就是传给消息真正的接受者。
return(CallNextHookEx(_keyboardHookHandle, nCode, wParam, lParam));
}