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Date Posted: 18:11:32 05/10/01 Thu
Author: Tim Carter
Subject: Re: Frame support in TScanner
In reply to: Michel 's message, "Re: Frame support in TScanner" on 07:51:10 03/19/01 Mon

Sorry for the delay getting back... the code worked great.

Thanks,

Tim.


>Hi Tim,
>
>I have not done more work on this, but a user of
>Envision has successfully got it to work. Here
>
>is the email he sent me. Let me know if this works on
>your scanner.
>
>Best regards,
>
>Michel
>
><<
>Subject: Re: Envision library
>Date: Thu, 9 Nov 2000 07:55:48 +0100
>From: "Tomaz Koritnik" <tomaz.koritnik@kiss.uni-lj.si>
>To: "Michel Brazeau" <michel@intervalsoftware.com>
>
>Hi
>
> Here you have both functions for getting snd
>settng layout. They work
>with my scanner, but try them on your's as well.
>
>TSingleRect = record Left, Top, Right, Bottom: Single;
>end;
>
>function TScanner.GetImageLayout( var Rect:
>TSingleRect ): Boolean;
>var
> twRC: TW_UINT16;
> twImageLayout: TW_IMAGELAYOUT;
>begin
> if not FTwainLoaded then LoadTwain;
> if not FSourceloaded then SelectScanner;
> FillChar(twImageLayout, SizeOf(twImageLayout), 0);
> twRc := FTwainData.DsmEntry( @FTwainData.AppId,
>@FTwainData.SourceId,
>DG_IMAGE, DAT_IMAGELAYOUT, MSG_GET, @twImageLayout );
> case twRC of
> TWRC_SUCCESS :
> begin
> Rect.Left := FIX32ToSingle(
>twImageLayout.Frame.Left );
> Rect.Top := FIX32ToSingle(
>twImageLayout.Frame.Top );
> Rect.Right := FIX32ToSingle(
>twImageLayout.Frame.Right );
> Rect.Bottom := FIX32ToSingle(
>twImageLayout.Frame.Bottom );
> Result := true;
> end else
> begin
> Rect.Left := -1;
> Rect.Top := -1;
> Rect.Right := -1;
> Rect.Bottom := -1;
> Result := false;
> end;
> end;
>end;
>
>function TScanner.SetImageLayout( Rect: TSingleRect ):
>Boolean;
>var
> twRC: TW_UINT16;
> twImageLayout: TW_IMAGELAYOUT;
>begin
> if not FTwainLoaded then LoadTwain;
> if not FSourceloaded then SelectScanner;
> FillChar(twImageLayout, SizeOf(twImageLayout), 0);
> FTwainData.DsmEntry( @FTwainData.AppId,
>@FTwainData.SourceId, DG_IMAGE,
>DAT_IMAGELAYOUT, MSG_GET, @twImageLayout );
> twImageLayout.Frame.Left := SingleToFix32(
>Rect.Left );
> twImageLayout.Frame.Top := SingleToFix32( Rect.Top
>);
> twImageLayout.Frame.Right := SingleToFix32(
>Rect.Right );
> twImageLayout.Frame.Bottom := SingleToFix32(
>Rect.Bottom );
> twRc := FTwainData.DsmEntry( @FTwainData.AppId,
>@FTwainData.SourceId,
>DG_IMAGE, DAT_IMAGELAYOUT, MSG_SET, @twImageLayout );
> case twRC of
> TWRC_SUCCESS : Result := true;
> else
> Result := false;
> end;
>end;
>>>
>
>
>>I'm trying to add frame support to TScanner. I've
>>copied some test code that I found in enscan.pas but
>>the image frame doesn't change. I always get the
>>default height as set by the twain interface.
>>
>>twImageLayout.Frame.Left := SingleToFix32(0);
>>twImageLayout.Frame.Top := SingleToFix32(0);
>>twImageLayout.Frame.Right := SingleToFix32(8.5);
>>twImageLayout.Frame.Bottom :=
>>SingleToFix32fPageHeight);
>>twImageLayout.DocumentNumber := 1;
>>twImageLayout.PageNumber := 1;
>>twImageLayout.FrameNumber := 1;
>>
>>CallTriplet( @FTwainData.AppId,
>> @FTwainData.SourceId,
>> DG_IMAGE,
>> DAT_IMAGELAYOUT,
>> MSG_SET,
>> TW_MEMREF(@twImageLayout),
>> @twRC, FTwainData.DsmEntry
>> );
>>
>>Was there any more work done on the SetLayout
>>procedure?
>>
>>The units are set to inches. The scanner is a Fujitsu
>>309dc with auto doc feeder.
>>
>>btw, I'm using Envision for an internal imaging
>>project and it has been working for us beautifully.
>>Thanks.

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