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Date Posted: 07:08:30 07/16/02 Tue
Author: Michel
Subject: Re: Access Violation with scan
In reply to: Brian Lowe 's message, "Re: Access Violation with scan" on 22:18:38 07/12/02 Fri

Hi Brian,

I am still thinking on this one. The ScanLineSize looks correct with respect to the width. Are you sure the AV occurs only with that scanner? Do you have access to another scanner we can try on? At this point I am not sure if it is the result from the driver, the Envision source, or an interaction with your program. Does this AV occur if you scan in the Demo.EXE program?

Best regards,


>Hi Michel,
>Self.ScanLineSize = 216
>pBmpInfoHeader^.biHeight = 2200
>Self.Width = 1700
>Self.Height = 2200
>Self.ImageFormat = ifBlackWhite
>>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,
>>>In unit EnDiGraph.pas,
>>>procedure TDibGraphic.AssignFromDIBHandle( const
>>>InDibHandle : THandle );
>>>I get AV at the following line:
>>>+ ColorCount*SizeOf(TRgbQuad)],
>>>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 Lowe

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