/// <summary>
/// Raises the HookInvoked event. This method can be overriden
/// for particular implementations of a hook, or an implementation
/// can respond to the HookInvoked event.
/// </summary>
/// <param name="e">The HookEventArgs for this hook
/// event.</param>
protected virtual void OnHookInvoked(ref HookEventArgs e)
{
if (HookInvoked != null)
{
HookInvoked(this, ref e);
}
}
/// <summary>
/// Override for the generic hook's invoked event to
/// convert to a strongly typed MouseHookEvent:
/// </summary>
/// <param name="e">Generic Hook event argument details</param>
protected override void OnHookInvoked(ref HookEventArgs e)
{
// Convert into mouse details:
MOUSEHOOKSTRUCT mhs = (MOUSEHOOKSTRUCT)Marshal.PtrToStructure(
e.lParam, typeof(MOUSEHOOKSTRUCT));
MouseHookEventArgs mhe = new MouseHookEventArgs(
e.wParam, mhs);
OnMouseHookEvent(ref mhe);
}
/// <summary>
/// Default filter function.
/// </summary>
/// <param name="code">Hook code</param>
/// <param name="wParam">Hook wParam</param>
/// <param name="lParam">Hook lParam</param>
/// <returns></returns>
private int CoreHookProc(int code, IntPtr wParam, IntPtr lParam)
{
// According to MSDN docs, if code < 0 then you must call
// the next hook in the chain:
if (code < 0)
{
return(CallNextHookEx(HookHandle, code, wParam, lParam));
}
else
{
// Call the event:
HookEventArgs e = new HookEventArgs();
e.HookCode = code;
e.wParam = wParam;
e.lParam = lParam;
OnHookInvoked(ref e);
// Yield to the next hook in the chain:
return(CallNextHookEx(HookHandle, e.HookCode, e.wParam, e.lParam));
}
}
