How we can test whether USB device is connected or disconnected?

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VC6

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How we can test whether USB Device is connected or disconnected?
Please help for code in VB 6.0

Posted 23-Jan-12 21:02pm

navnathdivekar

Updated 23-Jan-12 21:07pm

Prasad_Kulkarni

v2

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Prasad_Kulkarni 24-Jan-12 3:07am

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Himachandra · Answer 1 · 2012-01-23T21:57:00

Here i provide the solution .........

VB

Function IsComPortAvailable(ByVal portNum As Integer) As Boolean
    Dim fnum As Integer
    On Error Resume Next
    MSComm1.CommPort = portNum
    MSComm1.PortOpen = True
        If Err = 0 Then
            MSComm1.PortOpen = False
            IsComPortAvailable = True
        End If
    End Function

VB

For i = 1 To 16
        If IsComPortAvailable(i) Then
        Combo1.AddItem (i)
        End If
    Next

Keep this code in timer and fix timer for 5 sec then it may show you every 5 secs which ports are available ...........