Scanner status detection

Question

How can I identify the status of a scanner, i.e. if it is active, if it is closed, or if it is on standby? without ManagementObject

Answer 1

A way can be with WIA

I did this test in a Button click :

• Add Reference "Microsoft Windows Image Acquisition Library v2.0" on the COM tab.

Test code (add a Button on the Form...) :

Imports System.Runtime.InteropServices
Imports WIA

Public Class Form1

    Public Const WIA_DPA_CONNECT_STATUS As String = "Connect Status"
    Public Const WIA_DIP_DEV_NAME As String = "Name"

    Public Const WIA_DEVICE_NOT_CONNECTED = 0
    Public Const WIA_DEVICE_CONNECTED = 1

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

        Dim deviceManager As New DeviceManager()
        For Each deviceInfo As DeviceInfo In deviceManager.DeviceInfos
            If deviceInfo.Type = WiaDeviceType.ScannerDeviceType Then
                Try
                    Dim device As Device = deviceInfo.Connect()

                    ' Test to display all properties
                    'Dim properties As Properties = device.Properties
                    'For Each prop In properties
                    '    Debug.WriteLine($"{prop.Name} : {prop.Value}")
                    'Next

                    If device.Properties.Exists(WIA_DIP_DEV_NAME) Then
                        Dim sName As String = CType(device.Properties(WIA_DIP_DEV_NAME).Value, String)
                        Debug.WriteLine($"{WIA_DIP_DEV_NAME} : {sName}")
                    Else
                        Debug.WriteLine($"{WIA_DIP_DEV_NAME} property not supported.")
                    End If

                    If device.Properties.Exists(WIA_DPA_CONNECT_STATUS) Then
                        Dim sStatus As String = CType(device.Properties(WIA_DPA_CONNECT_STATUS).Value, String)
                        sStatus = If(sStatus = WIA_DEVICE_CONNECTED, "Connected", "Disconnected")
                        Debug.WriteLine($"{WIA_DPA_CONNECT_STATUS} : {sStatus}")
                    Else
                        Debug.WriteLine($"{WIA_DPA_CONNECT_STATUS} property not supported.")
                    End If
                Catch ex As COMException When ex.ErrorCode = &H80210006 ' WIA_ERROR_BUSY : HRESULT : 0x80210006
                    Debug.WriteLine("The device is busy. Try again later.")
                Catch ex As Exception
                    Debug.WriteLine($"An error occurred: {ex.Message}")
                End Try
            End If
        Next

    End Sub
End Class