/// <summary>
/// Callback for LL Keyboard Hook
/// </summary>
private IntPtr KeyboardCallback(int code, IntPtr wParam, IntPtr lParam)
{
if (code < 0)
{
return(USER32.CallNextHookEx(IntPtr.Zero, code, wParam, lParam));
}
// Else Process
bool handled = false;
USER32.KBDLLHOOKSTRUCT kbd = (USER32.KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(USER32.KBDLLHOOKSTRUCT));
int wP = wParam.ToInt32();
bool isInjected = kbd.flags == USER32.KBDLLHOOKSTRUCTFlags.LLKHF_INJECTED;
bool isDownAlt = ((USER32.GetKeyState((uint)VirtualKey.VK_MENU) & 0x80) == 0x80 ? true : false);
bool isDownCtrl = ((USER32.GetKeyState((uint)VirtualKey.VK_CONTROL) & 0x80) == 0x80 ? true : false);
bool isDownShift = ((USER32.GetKeyState((uint)VirtualKey.VK_SHIFT) & 0x80) == 0x80 ? true : false);
bool isDownCapslock = (USER32.GetKeyState((uint)VirtualKey.VK_CAPITAL) != 0 ? true : false);
bool isDownNumlock = (USER32.GetKeyState((uint)VirtualKey.VK_NUMLOCK) != 0 ? true : false);
bool isDownScrolllock = (USER32.GetKeyState((uint)VirtualKey.VK_SCROLL) != 0 ? true : false);
// If Key Down
if (this.KeyDown != null && (wP == (int)WM.SYSKEYDOWN || wP == (int)WM.KEYDOWN))
{
KeyHookEventArgs e = new KeyHookEventArgs(kbd.vkCode, isInjected, isDownAlt, isDownCtrl, isDownShift, isDownCapslock, isDownNumlock, isDownScrolllock);
this.KeyDown.Invoke(e);
handled = e.Handled;
}
// Key Press
if (this.KeyPressed != null && wP == (int)WM.KEYDOWN)
{
byte[] keyState = new byte[256];
USER32.GetKeyboardState(keyState);
byte[] inBuffer = new byte[2];
if (USER32.ToAscii(kbd.vkCode, kbd.scanCode, keyState, inBuffer, (uint)kbd.flags) == 1)
{
char key = (char)inBuffer[0];
if ((isDownCapslock ^ isDownShift) && Char.IsLetter(key))
{
key = Char.ToUpper(key);
}
KeyHookEventArgs e = new KeyHookEventArgs(kbd.vkCode, key, isInjected, isDownAlt, isDownCtrl, isDownShift, isDownCapslock, isDownNumlock, isDownScrolllock);
this.KeyPressed.Invoke(e);
handled = handled || e.Handled;
}
}
// Key Up
if (this.KeyUp != null && (wP == (int)WM.SYSKEYUP || wP == (int)WM.KEYUP))
{
Keys keyData = (Keys)kbd.vkCode;
KeyHookEventArgs e = new KeyHookEventArgs(kbd.vkCode, isInjected, isDownAlt, isDownCtrl, isDownShift, isDownCapslock, isDownNumlock, isDownScrolllock);
this.KeyUp.Invoke(e);
handled = handled || e.Handled;
}
if (handled)
{
return(new IntPtr(-1));
}
return(USER32.CallNextHookEx(this.kbdHook, code, wParam, lParam));
}