Private Sub Form_Load() If IsConnected = TRUE Then MsgBox (“您已经连通了Internet!”) End If If IsConnected = FALSE Then MsgBox (“您还没有连通 Internet!”) End If End Sub
Option Explicit /*有关的API声明和定义*/ Public Declare Function RasEnumConnections Lib “RaSAPi32.dll” Alias “RasEnumConnectionsA” (lpRasCon As Any, lpcb As Long, lpcConnections As Long) As Long
Public Declare Function RasGetConnectStatus Lib “RasApi32.dll” Alias “RasGetConnectStatusA” (ByVal hRasCon As Long, lpStatus As Any) As Long
/*常数和变量的设定*/ Public Const RAS95_MaxEntryName = 256 Public Const RAS95_MaxDeviceType = 16 Public Const RAS95_MaxDeviceName = 32 Public Type RASCONN95 dwSize As Long hRasCon As Long szEntryName(RAS95_MaxEntryName) As Byte szDeviceType(RAS95_MaxDeviceType) As Byte szDeviceName(RAS95_MaxDeviceName) As Byte End Type Public Type RASCONNSTATUS95 dwSize As Long RasConnState As Long dwError As Long szDeviceType(RAS95_MaxDeviceType) As Byte szDeviceName(RAS95_MaxDeviceName) As Byte End Type
/*函数IsConnected返回连通的状态，如果为True则表示已连通*/ Public Function IsConnected() As Boolean Dim TRasCon(255) As RASCONN95 Dim lg As Long Dim lpcon As Long Dim RetVal As Long Dim Tstatus As RASCONNSTATUS95 TRasCon(0).dwSize = 412 lg = 256 * TRasCon(0).dwSize RetVal = RasEnumConnections(TRasCon(0), lg, lpcon) If RetVal <> 0 Then MsgBox “错误” Exit Function End If Tstatus.dwSize = 160 RetVal = RasGetConnectStatus(TRasCon(0) .hRasCon,Tstatus) If Tstatus.RasConnState = ＆H2000 Then IsConnected = TRUE Else IsConnected = FALSE End If End Function
