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[VB.NET] Detect whether the USB device is plugged in or taken out without timer

May 3rd, 2009
1 comment


.NET programming
The following VB.NET code will help you to check whether a USB device is plugged in or taken out. No timer is used here. You can integrate this tip to your program just by copy and paste.

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    Private WM_DEVICECHANGE As Integer = &H219
 
    Public Enum WM_DEVICECHANGE_WPPARAMS As Integer
        DBT_CONFIGCHANGECANCELED = &H19
        DBT_CONFIGCHANGED = &H18
        DBT_CUSTOMEVENT = &H8006
        DBT_DEVICEARRIVAL = &H8000
        DBT_DEVICEQUERYREMOVE = &H8001
        DBT_DEVICEQUERYREMOVEFAILED = &H8002
        DBT_DEVICEREMOVECOMPLETE = &H8004
        DBT_DEVICEREMOVEPENDING = &H8003
        DBT_DEVICETYPESPECIFIC = &H8005
        DBT_DEVNODES_CHANGED = &H7
        DBT_QUERYCHANGECONFIG = &H17
        DBT_USERDEFINED = &HFFFF
    End Enum
 
    Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
        If m.Msg = WM_DEVICECHANGE Then
            Select Case m.WParam
                Case WM_DEVICECHANGE_WPPARAMS.DBT_DEVICEARRIVAL
                    MsgBox("USB device is just plugged in!")
                Case WM_DEVICECHANGE_WPPARAMS.DBT_DEVICEREMOVECOMPLETE
                    MsgBox("USB device is just taken out")
            End Select
        End If
        MyBase.WndProc(m)
    End Sub
Author: SquallLTT Categories: Programming Tags: ,