OnMessageAfter event OnMessageBefore Example

Applies to

acFormHook component.

Declaration

type

TacWndProcMessageAfterEvent = procedure(Sender: TObject; var Message: TMessage) of object;

property OnMessageAfter: TacWndProcMessageAfterEvent;

Description

The OnMessageAfter event occurs after processing of window message by default procedure handler.

Write the OnMessageAfter event handler to hook all windows messages (WM_xxx) sent to this form, after their processing by default message handler (CallWindowProc API routine).

Caution

Thousands of messages per second flow though this event. Be careful when coding the handler, because it can affect the performance of the entire application.

See also
OnMessageBefore event and small example how to hook windows messages.