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Date Posted: 07:10:08 04/01/02 Mon
Author: Michel
Subject: Re: TImageScrollBox Produces Memory Leak
In reply to: Rex 's message, "TImageScrollBox Produces Memory Leak" on 12:52:27 03/29/02 Fri


Hi Rex,

In version 2 this has been corrected. At the end of TImageScrollBox.Destroy there is,

{ MB Nov 28, 2000. As reported by Steen Jansdal, the WMDestroy method
may not be invoked if the TImageScrollBox is invisible. It is safe to
call FMouseHandler.Free, because if it is already destroyed it will be
nil. }
FMouseHandler.Free;

which will free the mouse handler if a handle was not allocated.

Best regards,

Michel

>When using the TImageScrollBox a Memory leak is
>produced if the Handle is never allcoated. This is
>because the MouseMode is set in the constructor
>creating a MouseHandler, but the Handler is Only
>destroyed by a WMDestory Message from Windows. If the
>Windows Handle is never allocated, this Message is
>never recvd. THis seems impossible, but a component
>in a Page of a TPageControl will not have a Windows
>Handle allocated until necessary. If you create a
>Form with a PageControl, never go to the page, the
>Handle will not be created and memory will not be
>freed when the form is destroyed.
>
>I can send Sample code to anyone interested.
>
>Is there a Fix for this in a Later release?
>
>-Rex

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