vb判断是否联网,判断网络状态调用gethostbyname API函数

Private Type WSADATA
    wversion As Integer
    wHighVersion As Integer
    szDescription(0 To 256) As Byte
    szSystemStatus(0 To 128) As Byte
    iMaxSockets As Integer
    iMaxUdpDg As Integer
    lpszVendorInfo As Long
End Type

Private Declare Function WSAStartup Lib "WSOCK32.DLL" (ByVal wVersionRequired As Integer, lpWSAData As WSADATA) As Long
Private Declare Function WSACleanup Lib "WSOCK32.DLL" () As Long
Private Declare Function gethostbyname Lib "WSOCK32.DLL" (ByVal szHostname As String) As Long
Private Const WS_VERSION_REQD = &H101

Public Function IsConnectedState() As Boolean
    Dim udtWSAD As WSADATA
    Call WSAStartup(WS_VERSION_REQD, udtWSAD)
    IsConnectedState = CBool(gethostbyname("www.baidu.com"))
    Call WSACleanup
End Function

Private Sub Command1_Click() '调用方法
    If IsConnectedState = True Then
        Me.Caption = "已联网"
    Else
        Me.Caption = "未联网"
    End If
End Sub
vb判断是否联网调用gethostbyname API函数q1016058890