How to detect connected device(scanner) not an installed device drivers.

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hello friends i am using TWAINDotNet(version 1.0.0.0 ) dll for scan document it scan documents perfectly but problem is twain acquire the devices eg. scanner which is offline(this devices physically not present only setup installed.)

so i want to display the only connected devices which is online(physically connected not an installed setup devices.).

What I have tried:

 Private _twain As Twain

_twain = New Twain(New WpfWindowMessageHook(Me))

sourceList = _twain.SourceNames

CmbScannerNameList.ItemsSource = sourceList

using this code _twain bind this sources names to combo-box.which is online as well as offline devices(setup installed devices). i want to detect the online(which is physically present) ?

please help

thanks in advance . :)

Posted 13-Feb-18 18:49pm

ketan Ram Patil

Updated 13-Feb-18 19:26pm

v4

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Ralf Meier 14-Feb-18 1:32am

Mostly those information is stored in the Registry from Windows. But I can't give you a Key-Name - but maybe this information helps you anyway to find a possible way ...

ketan Ram Patil 14-Feb-18 1:44am

thank you for your valuable replay.. :)

yes i seen in the regedit " HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{6bdd1fc6-810f-11d0-bec7-08002be2092f} "

after class it shows so many devices list but this devices not connected to computer.

don't know what to do now :(

Ralf Meier 14-Feb-18 2:18am

I only can give you this inspiration - sorry - not the solution, because I'm not sitting at your place ...
Basicly you must find much more Entries corresponding to your Twain-Driver OR your device. Perhaps you look also for the VID and the PID of your device.
A possible Path could be : HKey_Local_Machine\System\ControlSet001\ENum\ ... and after this point look for your VID and the PID of your Device or it's Driver. Somewhere you should have the Device-Parameter and one of this parameters possible is different if the Device is attached or not ...

Michael_Davies 14-Mar-18 4:11am

Have you tried using Windows Image Acquisition library, one of the properties may indicate state.

Severla sites, try this https://social.microsoft.com/Forums/en-US/4b350704-d9b3-4920-a68a-802f5f4e8a6a/how-to-retrieve-installed-scanner-win32scanner?forum=netfxbcl

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