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Date Posted: 17:05:52 12/15/01 Sat
Author: Poul Halgaard
Subject: Re: Problem with scanning
In reply to: Michel 's message, "Re: Problem with scanning" on 17:42:39 12/14/01 Fri

It happens in TScanner.Acquire - the first call to CallTriplet:

function CallTriplet( const pSourceId : PTW_IDENTITY;
const pAppId : PTW_IDENTITY;
const DataGroup : TW_UINT32;
const DataType : TW_UINT16;
const Msg : TW_UINT16;
const pData : TW_MEMREF;
const pTwainResult : PTW_UINT16;
const DsmEntry : TDSM_Entry ) : Boolean;
var
TwainResult : TW_UINT16;
TwStatus : TW_STATUS;
begin

>>>> IN THIS CALL:
TwainResult := DSMEntry(
pAppId, pSourceId,
DataGroup,
DataType,
Msg, pData );


Does this help you? Should I send the parametervalues - then you could try to call with those values and see what happens.
I did not modify the demo and it also happens if I run it from outside Delphi. The AV is in kernal32.dll.
The TWAIN interface works in other programs.

Rgds Poul

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