module1.bas

vb得100个编程实例

Attribute VB_Name = "Module1"
Public Declare Function InternetGetConnectedStateEx Lib "wininet.dll" _
    Alias "InternetGetConnectedStateExA" _
    (ByRef lpdwFlags As Long, _
    ByVal lpszConnectionName As String, _
    ByVal dwNameLen As Long, _
    ByVal dwReserved As Long _
    ) As Long

Public Enum EIGCInternetConnectionState
    INTERNET_CONNECTION_MODEM = &H1&
    INTERNET_CONNECTION_LAN = &H2&
    INTERNET_CONNECTION_PROXY = &H4&
    INTERNET_RAS_INSTALLED = &H10&
    INTERNET_CONNECTION_OFFLINE = &H20&
    INTERNET_CONNECTION_CONFIGURED = &H40&
End Enum

Public Property Get InternetConnected( _
    Optional ByRef eConnectionInfo As EIGCInternetConnectionState, _
    Optional ByRef sConnectionName As String _
    ) As Boolean
    Dim dwFlags As Long
    Dim sNameBuf As String
    Dim lR As Long
    Dim iPos As Long
    
    sNameBuf = String$(513, 0)
    lR = InternetGetConnectedStateEx(dwFlags, sNameBuf, 512, 0&)
    eConnectionInfo = dwFlags
    iPos = InStr(sNameBuf, vbNullChar)
    If iPos > 0 Then
        sConnectionName = Left$(sNameBuf, iPos - 1)
    ElseIf Not sNameBuf = String$(513, 0) Then
        sConnectionName = sNameBuf
    End If
    InternetConnected = (lR = 1)
End Property