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Date Posted: 17:42:51 03/21/02 Thu
Author: Michel
Subject: Re: External Exception when closing scanner
In reply to: Mike Burger 's message, "External Exception when closing scanner" on 07:53:25 03/21/02 Thu


Hi Mike,

I seem to recall some users have reported similar errors on HP scanners. The first thing is make sure you don't test this from inside the IDE; this can cause problems. You have to run your program outside the IDE with twain, or turn off integrated debugging in the debugger options.

Also making sure you have the latest twain DLLs from www.twain.org may help and check if HP have an updated driver.

Best regards,

Michel
>I have an application that I wrote that has worked
>fine for several years. However, when trying this
>program with a HP 5300C scanner, I get an
>ExternalException error. I have it narrowed down to
>this part of code inside acquire:
>
> finally
> if FTwainData.SourceId.Id <> 0 then
> begin
> if not CallTriplet( nil,
>@FTwainData.AppId, DG_CONTROL, DAT_IDENTITY,
>MSG_CLOSEDS,
> @FTwainData.SourceId,
>nil, FTwainData.DsmEntry) then
> raise ETwainError.Create('Unable to
>close TWAIN data source');
>
> FillChar(FTwainData.SourceId,
>SizeOf(FTwainData.SourceId), 0);
> end;
> end;
>
>The exception is raised on the first DSMEntry call
>inside CallTriplet. All of the other triplet calls
>work fine. Has anybody experienced this?
>
>
>--Mike Burger

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