Detect when Removable USB Volume Drive Devices are Attached or Removed – VB.NET [duplicate] - vb.net

Question

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Portable Device Detection
(1 answer)
Closed 5 years ago.
Below is some code I saw on a vb message board along time ago but I can’t remember where. It may have been vbforums.com. I made some code changes and then tested the code to have it throw a messagebox with the drive letter of the new usb device being attached or removed. It uses application subclassing to intercept the messages and checks if any are activated by a removable volume being Removed, Inserted, Attached, etc.. If it is then it will parse the volume drive letter of the device and throw a messagebox letting you know. USB devices like flash drives (Thumb Drives or Pen Drive’s as they are also called), external hard drives, etc. with a removable disk volume should be detected just fine. My testing recognized different usb volumes with no problems. You can use this code with VB.NET, Visual Basic 2008, VB 2010, 2013, etc. to check for both the arrival of usb volume devices and the removal. You can also make some changes to make it work for VB 6.0 as well. Visual Basic 6.0 will need an addiional API call or two for the subclassing portion.

Answer 1

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