判断网络连接.frm

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VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "判断网络连接"
      Height          =   435
      Left            =   1200
      TabIndex        =   0
      Top             =   1200
      Width           =   1815
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Declare Function InternetGetConnectedState Lib "wininet" (lpdwFlags As Long, ByVal dwReserved As Long) As Boolean
Private Const Internet_Connection_Modem = 1
Private Const Internet_Connection_Lan = 2
Private Const Internet_Connection_Proxy = 4

Private Sub Command1_Click()
    Dim Flags As Long
    Dim Result As Boolean
    Result = InternetGetConnectedState(Flags, 0)
    If Result Then
        MsgBox "已经连接"
    Else
        MsgBox "没有连接"
    End If
    If Flags And Internet_Connection_Modem Then MsgBox "您是通过Modem连接上网的"
    If Flags And Internet_Connection_Lan Then MsgBox "您是通过局域网连接上网的"
    If Flags And Internet_Connection_Proxy Then MsgBox "您是通过代理服务器上网的"
End Sub