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#1 Posted : Sunday, August 20, 2006 11:44:48 PM(UTC)


Groups: Registered
Posts: 4


I'm so sorry , I queried many questions for a short time.

But, I guess these questions are helpful for all of us. :) ....maybe...

I wonder how to check the Device status before opening Interface Dialog.

When  I open Interface Dialog directly with ::"L_TwainAcquireList" ,

I have some problems.

There are results that I can't expect.

Because when I access a device after other program accesses same one, already.

So I need how to check device status before a opening Interface Dialog.

is it possible?

Although "L_TwainAcquireList"  returnes codes powerfully,

There are many cases that are  fatal error in implcit  before returning code. 

What am i going to do?

Thank you for reading.


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#2 Posted : Wednesday, August 23, 2006 10:27:00 PM(UTC)
Maen Hasan

Groups: Registered, Tech Support
Posts: 1,326

Was thanked: 1 time(s) in 1 post(s)


You need to determine whether
the TWAIN source is installed by using the L_IsTwainAvailable function.
If the function returnes At least TRUE, this means at least one TWAIN
source is installed. Then you need to call the L_TwainInitSession
function to Initializes the TWAIN session. If the function returns success then I think it's safe to call the L_TwainAcquireList function.

But if you need to check the
success of scanning each image individually, you should use the
L_TwainAcquire function and provide a LTWAINBITMAPCALLBACK function for processing each image.

For more information, please refer to the LEADTOOLS Twain API Help file and read the following topics:
- L_IsTwainAvailable.
- L_TwainInitSession.
- L_TwainAcquireList.
- L_TwainAcquire.

Maen Badwan
LEADTOOLS Technical Support
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