我们如何测试USB设备是否已连接或断开? [英] How we can test whether USB device is connected or disconnected?

问题描述

我们如何测试USB设备是已连接还是已断开?
请帮助VB 6.0中的代码

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

推荐答案

在此提供解决方案.........

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

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

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

将此代码保存在计时器中，并修复计时器5秒钟，然后可能每5秒钟向您显示哪些端口可用...........

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

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