Portable Device Detection

Question

I need a functionality in my program (written in VB.NET) that detects whether the USB Portable Device (Windows CE 5.0) is inserted or removed. I have found a VB.NET code from th

Answer 1

Imports System.Runtime.InteropServices
Public Class Form1
'Used to detected if any of the messages are any of these constants values.
Private Const WM_DEVICECHANGE As Integer = &H219
Private Const DBT_DEVICEARRIVAL As Integer = &H8000
Private Const DBT_DEVICEREMOVECOMPLETE As Integer = &H8004
Private Const DBT_DEVTYP_VOLUME As Integer = &H2  '
'
'Get the information about the detected volume.
Private Structure DEV_BROADCAST_VOLUME
    Dim Dbcv_Size As Integer
    Dim Dbcv_Devicetype As Integer
    Dim Dbcv_Reserved As Integer
    Dim Dbcv_Unitmask As Integer
    Dim Dbcv_Flags As Short
End Structure

Protected Overrides Sub WndProc(ByRef M As System.Windows.Forms.Message)
    '
    'These are the required subclassing codes for detecting device based removal and arrival.
    '
    If M.Msg = WM_DEVICECHANGE Then
        Select Case M.WParam
            '
            'Check if a device was added.
            Case DBT_DEVICEARRIVAL
                Dim DevType As Integer = Runtime.InteropServices.Marshal.ReadInt32(M.LParam, 4)
                If DevType = DBT_DEVTYP_VOLUME Then
                    Dim Vol As New DEV_BROADCAST_VOLUME
                    Vol = Runtime.InteropServices.Marshal.PtrToStructure(M.LParam, GetType(DEV_BROADCAST_VOLUME))
                    If Vol.Dbcv_Flags = 0 Then
                        For i As Integer = 0 To 20
                            If Math.Pow(2, i) = Vol.Dbcv_Unitmask Then
                                Dim Usb As String = Chr(65 + i) + ":\"
                                MsgBox("Looks like a USB device was plugged in!" & vbNewLine & vbNewLine & "The drive letter is: " & Usb.ToString)
                                Exit For
                            End If
                        Next
                    End If
                End If
                '
                'Check if the message was for the removal of a device.
            Case DBT_DEVICEREMOVECOMPLETE
                Dim DevType As Integer = Runtime.InteropServices.Marshal.ReadInt32(M.LParam, 4)
                If DevType = DBT_DEVTYP_VOLUME Then
                    Dim Vol As New DEV_BROADCAST_VOLUME
                    Vol = Runtime.InteropServices.Marshal.PtrToStructure(M.LParam, GetType(DEV_BROADCAST_VOLUME))
                    If Vol.Dbcv_Flags = 0 Then
                        For i As Integer = 0 To 20
                            If Math.Pow(2, i) = Vol.Dbcv_Unitmask Then
                                Dim Usb As String = Chr(65 + i) + ":\"
                                MsgBox("Looks like a volume device was removed!" & vbNewLine & vbNewLine & "The drive letter is: " & Usb.ToString)
                                Exit For
                            End If
                        Next
                    End If
                End If
        End Select
    End If
    MyBase.WndProc(M)
End Sub
End Class