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 How to clear frame selection crated in the Twain interface dialog ?		  New Topic  Reply to Topic
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mastinf

Italy
46 Posts
Posted - Feb 19 2025 :  08:32:29  Show Profile  Reply
Hello,

This is the situation:

the first image is acquired using the scanner interface:

img.io.TwainParams.VisibleDialog:=true;

in the scanner interface the user do a selection and acquires a partial frame.

Then next image acqusition is made without the scanner interface

img.io.TwainParams.VisibleDialog:=false;


In the second acquisition unfortunaltely it's still used the selection made in the scanner interface. Is it possible to clear the selection created in the scanner interface by code ?

thanks

Roberto

ImageEn 12.5.0

Roberto Nicchi
Master Informatica
Italy

xequte

38899 Posts
Posted - Feb 20 2025 :  13:33:59  Show Profile  Reply
Hi Roberto

You can use:

https://www.imageen.com/help/TIETwainParams.SetDefaultParams.html

Nigel
Xequte Software
www.imageen.com
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mastinf

Italy
46 Posts
Posted - Feb 22 2025 :  07:15:30  Show Profile  Reply
Hello,

I have just tried to execute the following code

img.IO.TwainParams.SetDefaultParams();
img.io.TwainParams.VisibleDialog:=false;
img.IO.Acquire;


but it didn't help. I miss something?

thanks

Roberto

Roberto Nicchi
Master Informatica
Italy
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mastinf

Italy
46 Posts
Posted - Feb 22 2025 :  07:35:50  Show Profile  Reply
Ok i have found the solution looking into a demo application:

img.IO.TwainParams.SetDefaultParams; <--- This doesn't help
img.io.TwainParams.AcquireFrameEnabled:=true; <---This line and the next one solve the problem
img.IO.TwainParams.Update;
img.io.TwainParams.VisibleDialog:=false;
img.IO.Acquire;

Roberto Nicchi
Master Informatica
Italy
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xequte

38899 Posts
Posted - Feb 23 2025 :  16:11:04  Show Profile  Reply
Hi Roberto

Sorry, I'm not following AcquireFrameEnabled := True, should make the scanner use a selection, not prevent it.



Nigel
Xequte Software
www.imageen.com
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mastinf

Italy
46 Posts
Posted - Feb 26 2025 :  09:44:52  Show Profile  Reply
Hello,

If AcquireFrameEnabled is set to false the acquire procedure continue to get the frame selected in the twain interface

If AcquireFrameEnabled is set to true i see that the UPDATE procedure set AcquireFrameTop,Left,Right and Bottom with the corrent values to get the full frame.


Roberto Nicchi
Master Informatica
Italy
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mastinf

Italy
46 Posts
Posted - Feb 26 2025 :  10:11:14  Show Profile  Reply
Try with the TwainDemo https://www.imageen.com/files/demos/run/ImageAcquisition/Twain/TwainDemo.exe

Do a first scan activating "Scanner Dialog Visible"

Do a selection and acquire the image.

Deactivate "Scanner Dialog Visible" and repeat acquire. Here i get again that frame selected before and not the full frame.

Roberto Nicchi
Master Informatica
Italy
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xequte

38899 Posts
Posted - Feb 26 2025 :  21:16:10  Show Profile  Reply
Thanks Roberto, we'll look into that.



Nigel
Xequte Software
www.imageen.com
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xequte

38899 Posts
Posted - Mar 19 2025 :  23:49:27  Show Profile  Reply
Hi Roberto

Please try the following option in next week's release:

IEGlobalSettings().TwainCompatibilityOptions := IEGlobalSettings().TwainCompatibilityOptions + [ ietcExplicitAcquireFrame ];

Nigel
Xequte Software
www.imageen.com
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