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Date Posted: 07:29:18 06/18/01 Mon
Author: Michel
Subject: Re: How to abort the Transform process?
In reply to: wto 's message, "How to abort the Transform process?" on 05:39:57 06/16/01 Sat


Hi,

There is currently no straight forward to abort an image transformation. I have added this to my todo list. What should work though is to raise an exception within the on progress handler. For example, call SysUtils.Abort.

Best regards,

Michel


>Currently I use the following code to do a image
>format transform:
> BitmapGraphic := TBitmapGraphic.Create;
> BitmapGraphic.Assign(MyBitmap);
> labStatus.Caption := 'Reduce colors...';
> Transform := TImageFormatTransform.Create;
> try
> Transform.ImageFormat := ifColor256;
> Transform.Quantize := True;
> Transform.Dither := True;
> Transform.OnProgress :=
>ReduceColorProgress;
> Transform.Apply(BitmapGraphic);
> finally
> Transform.Free;
> end;
>And in the on progress event:
>procedure TLogoForm.ReduceColorProgress(const Sender:
>TObject; const PercentProgress: Byte);
>begin
> Progress.Position := PercentProgress + 1;
> Application.ProcessMessages;
>end;
>
>where Progress is a TProgressBar.
>In some cases, user may click close button on the
>dialog
>and the form will close while still in transform
>process,
>so I want to abort the transform when I received a
>FormClose
>event, how should I do?

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