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Date Posted: 21:07:17 07/21/02 Sun
Author: Brian Lowe
Subject: Re: Access Violation with scan
In reply to: Michel 's message, "Re: Access Violation with scan" on 07:08:30 07/16/02 Tue

Hi Michel,

>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?

I have only the one scanner, a Xerox WorkCentre M950. I may be able to try it at a different location with a different scanner. Will let you know.

> 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?

The AV does indeed occur at the same place in Demo.EXE.

Brian

>>Hi Michel,
>>
>>Self.ScanLineSize = 216
>>pBmpInfoHeader^.biHeight = 2200
>>Self.Width = 1700
>>Self.Height = 2200
>>Self.ImageFormat = ifBlackWhite
>>
>>Brian
>>
>>
>>>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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