Question

I am using a Motorola DS4208 hand held barcode reader. In the past I was able to successfully setup and use this device, however recently it has stopped working. This may be the result of installing other devices that also use OPOS and POS for .Net interfaces.

This is a USB device so I created a Control Configuration file named *Moto_Scanner.xml* and placed it in the correct location.

<PointOfServiceConfig Version="1.0">
<ServiceObject Type="Scanner" Name="Example Scanner">
<HardwareId 
    From="HID\VID_05E0&amp;PID_1300&amp;REV_0100" 
    To="HID\VID_05E0&amp;PID_1300&amp;REV_0100" />
<HardwareId 
    From="HID\VID_05E0&amp;PID_1300" 
    To="HID\VID_05E0&amp;PID_1300" />
</ServiceObject>
</PointOfServiceConfig>

Using SOMgr.exe I can see the device in POSDevices with the proper path. I then created a LogicalName of MotoScan. It then appears in the Logical Names list as expected.

Using Microsoft Point Of Service\SDK\Samples\Sample Application\TestApp.exe I am able to open and claim the device. However, after attempting click the enable checkbox I get the following error message.

POSControlException ErrorCode(Failure) ExtendedErrorCode(0) occurred: Unable to enable the device.  See inner exception for details.
System.ComponentModel.Win32Exception: The process cannot access the file because it is being used by another process
   at Microsoft.PointOfService.ExampleServiceObjects.HidReader.HidThread.StartReading()
   at Microsoft.PointOfService.ExampleServiceObjects.HidReader.OpenDevice()
   at Microsoft.PointOfService.ExampleServiceObjects.ExampleScanner.set_DeviceEnabled(Boolean value)
Opened device: Example Scanner
Created instance of device: Example Scanner

Motorola provides an app called 123Scan to assist with configuration and testing. Using this app I can confirm the device works. This app was eventually uninstalled as part of troubleshooting.

Any suggestions will be appreciated.

Answer 1

Have you tried installing the OPOS driver?

EDIT:

Instead of re-linking this every time it expires, you should proactively search for “OPOS Driver” at http://support.symbol.com so that you can download the driver for the appropriate platform.