OnMessageBefore event
OnMessageAfter Example
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OnMessageBefore event
OnMessageAfter Example |
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| acFormHook component.
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| type
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| TacWndProcMessageBeforeEvent = procedure(Sender: TObject; var Message: TMessage; var Handled: Boolean) of object;
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| property OnMessageBefore: TacWndProcMessageBeforeEvent;
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| The OnMessageBefore event occurs when acFormHook component hooks the message (WM_xxx) for this window, before message passes to the default procedure handler.
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| Write the OnMessageBefore event handler to hook all windows messages (WM_xxx) sent to this form, before their processing by default message handler (CallWindowProc API routine).
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| If you have processed this message and do not want to pass it to default message handler, set Handled parameter True.
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 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.
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| OnMessageAfter event and small example how to hook windows messages.
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