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Date Posted: 07:33:36 05/16/00 Tue
Author: Michel
Subject: Re: Acquire with ShowUI=true
In reply to: Joerg 's message, "Acquire with ShowUI=true" on 06:19:13 05/16/00 Tue


Hi Joerg,

In your code, the problem is that you are creating your Graphic as a TDibGraphic, so you cannot typecast it to a TTiffGraphic or TJpegGraphic. Instead, create your Graphic object in the case statement itself:

case Graphic.ImageFormat of
ifBlackWhite:
begin
Graphic := TTiffGraphic.Create;
Graphic.AssignFromDibHandle(DibHandle);
Graphic.XDotsPerInch := XDpi;
Graphic.YDotsPerInch := YDpi;
Graphic.Compression := tcGroup4;
Graphic.SaveToFile('c:\temp\test.tif');
end;
ifTrueColor:
begin
Graphic := TJpegGraphic.Create;
Graphic.AssignFromDibHandle(DibHandle);
Graphic.XDotsPerInch := XDpi;
Graphic.YDotsPerInch := YDpi;
Graphic.SaveToFile('c:\temp\test.jpg');
end;
end; { case }

You should also add a default in your case statement to handle other image formats.

Best regards,

Michel

> Hello Michel,
>
> how can I get information about ImageFormat and
> XYResolution with ShowUI=true? I need it to select the
> best image filetype and compression.
>
> Example:
> If user acquires a bw image, my app shall save it
> automatically as tif fax g4, if he scans truecolor, my
> app shall save it as jpeg. Please have a look at the
> following source. Can I do so or what goes wrong?
>
> procedure TXImageFrame.Acquire(const DibHandle:
> THandle; const XDpi,
> YDpi: Word; const CallBackData: Integer);
> var Graphic: TDibGraphic;
> begin
> Graphic := TDibGraphic.Create;
> try
> Graphic.AssignFromDibHandle(DibHandle);
> Graphic.XDotsPerInch := XDpi;
> Graphic.YDotsPerInch := YDpi;
> case Graphic.ImageFormat of
> ifBlackWhite: with TTiffGraphic(Graphic) do begin
> Compression := tcGroup4;
> SaveToFile('c:\temp\test.tif');
> end;
> ifTrueColor:
> TJpegGraphic(Graphic).SaveToFile('c:\temp\test.jpg');
> end;
> finally
> Graphic.Free;
> end;
> end;
>
> Thank you very much and regards from germany
> Joerg

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