Re: When should set the TWAIN capability again?

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This topic and its replies were posted before the current version of LEADTOOLS was released and may no longer be applicable.

#1 Posted : Wednesday, January 3, 2007 12:53:46 AM(UTC)

Raymond Lee

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Posts: 30

Hi,

If I do not call the TwainSession.Shutdown(), then is it not necessary to set the TWAIN capability settings until TwainSession.Startup() is called? (or new another TwainSession? which one?)

Thanks for your kind attention,

Raymond


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#2 Posted : Thursday, January 4, 2007 4:08:36 PM(UTC)

Raymond Lee

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Posts: 30

Hi,

It seems that if a new TwainSession is created (by new TwainSessiona and Startup), then the capabilities must be set it again as the SetCapability() is the class method of TwainSession. This principle should be applied to .NET as well, right?

Please let me know if I am correct or not.

Thanks,
Raymond

#3 Posted : Sunday, January 7, 2007 6:02:48 AM(UTC)

Qasem Lubani

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Posts: 3,022

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This depends on the Twain driver, as some of them
retain capability values, where others need you to set them every time you scan.

If your application is going to be used with
different types of scanners, always set the capabilities to be on the safe side.

#4 Posted : Friday, April 20, 2007 4:26:35 AM(UTC)

Siimon

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Posts: 2

Hello,

Is there a way to change the Twain capabilities during the same scan session?
Example : scan 5 documents in color and 5 documents in black n white in teh same twain session?

If not, is it possible to do it over isis driver?

Thx,
Simon.

#5 Posted : Tuesday, April 24, 2007 5:38:22 AM(UTC)

Maen Hasan

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Posts: 1,326

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Simon,

The Twain standard does not allow this to be done, unless you perform single-page scanning, check the image, change the capabilities, then perform another single-page scan and so on (multiple Acquire operations).

This means it's possible, but it will be slower than a single Acquire operation.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

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