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Date Posted: 06:47:48 02/18/03 Tue
Author: Michel
Subject: Re: ZoomToSelection Eats RAM and Fails
In reply to: Enrique Benedetti 's message, "ZoomToSelection Eats RAM and Fails" on 19:05:25 02/17/03 Mon

Hi Enrique,

When zooming, the entire image is zoomed, ie, Envision does not allow displaying images in individual parts, so when a small area is selected and zoom to selection is used, the resulting zoom factor is so large that the size of the bitmap to be created is too large for windows to handle.

I a better solution is something like Francesco Pucino's blowup panel, <a rel=nofollow target=_blank href="http://web.tiscali.it/delphipage/">http://web.tiscali.it/delphipage/</a>

For your second error, what are the steps to reproduce it?

Best regards,


> I'm a newbie to Envision! I'm using DELPHI 6.0 and
>the demo app. I downloaded the demo.exe app and ran
>it. I noticed that when the "mouse mode" SELECT option
>is checked, and I go ahead and do an area selection
>("SMALL area is key") I get a couple of exceptions.
>Sometimes, I get an "Out of resources" or "scrollbars
>not present" exception. Othertimes, I do not get an
>outright exception, but the demo EATS all of my RAM
>plus creates huge PAGE faults and basically locks up
>the machine(peek in TASK MANAGER). The weird thing is
>that, If I go ahead and select a "larger area" it
>works fine. No Exceptions, No problems. By "SMALL"
>area I mean an area that fits a word of 6 or less
>chars. By"LARGER" area I mean anything larget then
> I downloaded the eval version of the lib and I
>traced it to the "ZoomToSelection" call. I have also,
>implemented an alternative "zoom on selection" by
>following Michel's
> examples from previous post but I get the same
>error on that code.
> So.. I really need zooming to work in order to use
>the lib. I also have to say that the LIB (Envision) is
>very very nice because of its simplicity and power.
>Hopefully someone can help me with this Zooming on
>selection problem.
> Another question. I need to be able to zoom into an
>area right after I load an image.
> But I get "a scrollbar not present " error also.
>I'm not sure if these errors are
> somehow related...
> Thanks in advance.

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