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Date Posted: 17:37:37 07/12/02 Fri
Author: Michel
Subject: Re: Access Violation with scan
In reply to: Brian Lowe 's message, "Access Violation with scan" on 07:45:57 07/12/02 Fri


Hi Brian,

It is the first time I encounter this. I am wondering if this is a problem with the DIB returned from the scanner driver.

The AV is probably occuring because the last parameter in the Move call is larger than the number of bytes allocated to the image buffer.

Could you look using the debugger the value of Self.ScanLineSize and pBmpInfoHeader^.biHeight?

What are the values of Self.Width, Self.Height, and Self.ImageFormat just before the AV occurs?

Best regards,

Michel

>In unit EnDiGraph.pas,
>procedure TDibGraphic.AssignFromDIBHandle( const
>InDibHandle : THandle );
>
>I get AV at the following line:
>
>Move(
>PByteArray(pBmpInfoHeader)^[SizeOf(TBitmapInfoHeader)
>+ ColorCount*SizeOf(TRgbQuad)],
>Self.Bits^,
>Self.ScanLineSize*pBmpInfoHeader^.biHeight);
>
>when scanning with:
>
>Black and White (1-bit)
>300 dpi
>8.5 x 11" Letter
>
>but no AV with 200 dpi.
>
>Can you suggest a fix? Please email to
>brian@belleson.com.
>
>Thanks,
>Brian Lowe

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