// ************************************************************************
// ************************************************************************
// Default filter function
protected int CoreHookProc(int code, IntPtr wParam, IntPtr lParam)
{
if (code < 0)
{
return(CallNextHookEx(m_hhook, code, wParam, lParam));
}
// Let clients determine what to do
HookEventArgs e = new HookEventArgs();
e.HookCode = code;
e.wParam = wParam;
e.lParam = lParam;
OnHookInvoked(e);
// Yield to the next hook in the chain
return(CallNextHookEx(m_hhook, code, wParam, lParam));
}
/// <summary>
/// LocalWindowsHook.HookInvoked event callback, called by LocalWindowsHook
/// when a message is received.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void LocalWindowsHook_HookInvoked(object sender, HookEventArgs e)
{
if (e.HookCode >= 0 && new IntPtr(WindowMessage.PM_REMOVE) == e.wParam)
{
// Copy the message to a local int variable
var msg = (uint)Marshal.ReadInt32(e.lParam, Marshal.OffsetOf(typeof(WindowsInterop.MSG), "Msg").ToInt32());
// Don't translate non-input events.
if (msg >= WindowMessage.WM_KEYFIRST && msg <= WindowMessage.WM_KEYLAST)
{
if (WindowsInterop.IsDialogMessage(m_Control.Handle, e.lParam) != 0)
{
// The value returned from this hook is ignored,
// and it cannot be used to tell Windows the message has been handled.
// To avoid further processing, convert the message to WM_NULL
// before returning.
var type = typeof (WindowsInterop.MSG);
Marshal.WriteInt32(e.lParam, Marshal.OffsetOf(type, "Msg").ToInt32(), WindowMessage.WM_NULL);
Marshal.WriteInt32(e.lParam,Marshal.OffsetOf(type, "wParam").ToInt32(), 0);
Marshal.WriteInt32(e.lParam, Marshal.OffsetOf(type, "lParam").ToInt32(), 0);
}
}
}
}
// ************************************************************************
// ************************************************************************
// Default filter function
protected int CoreHookProc(int code, IntPtr wParam, IntPtr lParam)
{
if (code < 0)
return CallNextHookEx(m_hhook, code, wParam, lParam);
// Let clients determine what to do
HookEventArgs e = new HookEventArgs();
e.HookCode = code;
e.wParam = wParam;
e.lParam = lParam;
OnHookInvoked(e);
// Yield to the next hook in the chain
return CallNextHookEx(m_hhook, code, wParam, lParam);
}
protected void OnHookInvoked(HookEventArgs e)
{
if (HookInvoked != null)
HookInvoked(this, e);
}