TwainAcquire... returns 0 when TwainSetHideUI is True

Discussions about TWAIN & WIA scanning in GdPicture.NET using GdPictureImaging.
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Loïc
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Re: TwainAcquire... returns 0 when TwainSetHideUI is True

Post by Loïc » Thu Mar 04, 2010 5:42 pm

Hi,

I suspect an out of memory issue.

Please could you try to reboot and start the program again ? If the problem persists what is the value returned by the GetStat method ?

With best regards,

Loïc

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Loïc
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Re: TwainAcquire... returns 0 when TwainSetHideUI is True

Post by Loïc » Fri Mar 05, 2010 10:10 am

Hi,

I am unable to understand why it works with driver UI on and don't work with driver UI off. Maybe a TWAIN driver problem.

I can suggest you a last option: acquire directly to file using file transfer mode. This can be done using the TwainAcquireToFile method instead of the TwainAcquireToGdPictureImage.

With best regards,

Loïc

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Loïc
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Re: TwainAcquire... returns 0 when TwainSetHideUI is True

Post by Loïc » Fri Mar 05, 2010 2:42 pm

Hi,

Could you attach the created file ?

Kind regards,

Loïc

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Loïc
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Re: TwainAcquire... returns 0 when TwainSetHideUI is True

Post by Loïc » Fri Mar 05, 2010 5:46 pm

Hi,

I really think your TWAIN driver is buggy.
The file generated include a kind of BMP header + only black pixels. The communication between the lib & your scanner seems perfect but the scan returns invalid data. Unfortunately I can't do anything else :(


You can check your scanner TWAIN compliance using the Twain sample Application provided by the twain.org team from this link:
http://sourceforge.net/projects/twain-samples/files/

I am almost sure you will have similar bad result using this app.

With best regards,

Loïc

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