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stuartclennett@gmail.com
United Kingdom
72 Posts |
 Posted - Feb 14 2019 : 10:38:33
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Hi,
Using the AllAcquire demo app, I am seeing two entries in the source selector combo for my camera:
- [camera icon] Canon Powershot G9
- [scanner icon] WIA Canon Powershot G9
Acquiring from both sources gives me the usual Windows "Which Pictures Do You Want To Copy?" dialog box with a grid of thumbnails, in which I can select multiple images (regardless of which driver I selected).
However, only the WIA driver will download multiple images. The non-WIA driver just downloads a single image (which is a lot quicker than the WIA downloads a single image) and then stops.
Can anyone tell me the reason for this?
Is there a way to get the non-WIA driver to acquire multiple images? It seems to use the same UI.
My users are getting pretty confuse, as am I.
Many thanks,
Stuart
Stuart Clennett
Delphi Berlin 10.1 |
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stuartclennett@gmail.com
United Kingdom
72 Posts |
Posted - Feb 18 2019 : 07:39:26
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Someone correct me if I'm wrong here:
As the non-WIA source (i.e. "Canon Powershot G9" with camera icon) seemingly pops up the WIA interface, is this using some kind of compatibility layer which is limiting functionality?
Stuart Clennett
Delphi Berlin 10.1 |
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xequte
38613 Posts |
Posted - Feb 18 2019 : 21:20:23
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Hi Stuart
Can you limit the acquire to just specific types, e.g. WIA or Twain to determine what type of interfaces they are. You are probably seeing one Twain driver and one WIA driver.
Though, this may not be the case. Confusingly, you often see Twain drivers labeled as WIA (which is based on the way the driver handles the communication rather than the interface that is exposed).
Nigel
Xequte Software
www.imageen.com
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stuartclennett@gmail.com
United Kingdom
72 Posts |
Posted - Feb 22 2019 : 09:10:48
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Hi Nigel,
Thanks for your reply. My app can filter by type, and you're right, the result is confusing to say the least.
TWAIN Only = "WIA-Canon PowerShot G9"
(This will download multiple files, takes longer per image)
WIA Only = "Canon PowerShot G9"
(This will only download a single image regardless of the selection, quicker than the TWAIN driver connection)
Is there a reason why WIA will only download a single image despite both using the same interface (or at least it appears so?).
Thanks
Stuart Clennett
Delphi Berlin 10.1 |
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xequte
38613 Posts |
Posted - Feb 24 2019 : 22:02:23
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Hi Stuart
I'm afraid I don't have any suggestions. I've seen a lot of this sort of weirdness with scanner drivers.
Nigel
Xequte Software
www.imageen.com
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stuartclennett@gmail.com
United Kingdom
72 Posts |
Posted - Feb 25 2019 : 06:01:53
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Okay -- thanks Nigel.
Stuart Clennett
Delphi Berlin 10.1 |
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Acquiring from WIA vs non-WIA drivers
