public int HookProcedure(int nCode, IntPtr wParam, IntPtr lParam)
{
bool cancel = false;
if (nCode >= 0 && (wParam == (IntPtr)User32.WindowMessage.WM_KEYDOWN || wParam == (IntPtr)User32.WindowMessage.WM_SYSKEYDOWN))
{
Win32Api.KBDLLHOOKSTRUCT kb = (Win32Api.KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(Win32Api.KBDLLHOOKSTRUCT));
if ((kb.dwFlags & Win32Api.KBDLLHOOKSTRUCTF.LLKHF_INJECTED) == 0)
{
cancel = OnKeyDownEvent(kb);
}
}
else if (nCode >= 0 && (wParam == (IntPtr)User32.WindowMessage.WM_KEYUP || wParam == (IntPtr)User32.WindowMessage.WM_SYSKEYUP))
{
Win32Api.KBDLLHOOKSTRUCT kb = (Win32Api.KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(Win32Api.KBDLLHOOKSTRUCT));
if ((kb.dwFlags & Win32Api.KBDLLHOOKSTRUCTF.LLKHF_INJECTED) == 0)
{
cancel = OnKeyUpEvent(kb);
}
}
if (cancel)
{
return((int)new IntPtr(1));
}
else
{
return(User32.CallNextHookEx(hookId.DangerousGetHandle(), nCode, wParam, lParam));
}
}
protected bool OnKeyUpEvent(Win32Api.KBDLLHOOKSTRUCT kb)
{
KeyHookEventArgs e = new(kb);
KeyUpEvent?.Invoke(this, e);
return(e.Cancel);
}
public KeyHookEventArgs(Win32Api.KBDLLHOOKSTRUCT kb)
{
VkCode = (Keys)kb.wVk;
ScanCode = kb.wScan;
Flags = kb.dwFlags;
IsLLKHF_EXTENDED = (Flags & Win32Api.KBDLLHOOKSTRUCTF.LLKHF_EXTENDED) != 0;
Time = kb.time;
}
