internal static IEnumerable <KeyPressEventArgsExt> FromRawDataApp(CallbackData data)
{
var wParam = data.WParam;
var lParam = data.LParam;
//http://msdn.microsoft.com/en-us/library/ms644984(v=VS.85).aspx
const uint maskKeydown = 0x40000000; // for bit 30
const uint maskKeyup = 0x80000000; // for bit 31
const uint maskScanCode = 0xff0000; // for bit 23-16
var flags = (uint)lParam.ToInt64();
//bit 30 Specifies the previous key state. The value is 1 if the key is down before the message is sent; it is 0 if the key is up.
var wasKeyDown = (flags & maskKeydown) > 0;
//bit 31 Specifies the transition state. The value is 0 if the key is being pressed and 1 if it is being released.
var isKeyReleased = (flags & maskKeyup) > 0;
if (!wasKeyDown && !isKeyReleased)
{
yield break;
}
var virtualKeyCode = (int)wParam;
var scanCode = checked ((int)(flags & maskScanCode));
const int fuState = 0;
char[] chars;
KeyboardNativeMethods.TryGetCharFromKeyboardState(virtualKeyCode, scanCode, fuState, out chars);
if (chars == null)
{
yield break;
}
foreach (var ch in chars)
{
yield return(new KeyPressEventArgsExt(ch));
}
}
internal static IEnumerable <KeyPressEventArgsExt> FromRawDataGlobal(CallbackData data)
{
var wParam = data.WParam;
var lParam = data.LParam;
if ((int)wParam != Messages.WM_KEYDOWN && (int)wParam != Messages.WM_SYSKEYDOWN)
{
yield break;
}
KeyboardHookStruct keyboardHookStruct =
(KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
var virtualKeyCode = keyboardHookStruct.VirtualKeyCode;
var scanCode = keyboardHookStruct.ScanCode;
var fuState = keyboardHookStruct.Flags;
if (virtualKeyCode == KeyboardNativeMethods.VK_PACKET)
{
var ch = (char)scanCode;
yield return(new KeyPressEventArgsExt(ch, keyboardHookStruct.Time));
}
else
{
char[] chars;
KeyboardNativeMethods.TryGetCharFromKeyboardState(virtualKeyCode, scanCode, fuState, out chars);
if (chars == null)
{
yield break;
}
foreach (var current in chars)
{
yield return(new KeyPressEventArgsExt(current, keyboardHookStruct.Time));
}
}
}
protected override KeyEventArgsExt GetDownUpEventArgs(CallbackData data)
{
return(KeyEventArgsExt.FromRawDataGlobal(data));
}
protected override IEnumerable <KeyPressEventArgsExt> GetPressEventArgs(CallbackData data)
{
return(KeyPressEventArgsExt.FromRawDataGlobal(data));
}
protected override MouseEventExtArgs GetEventArgs(CallbackData data)
{
return(MouseEventExtArgs.FromRawDataGlobal(data));
}
