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  • 怎样用VB断开与internet的连接

  • 2017-09-22 21:54 来源:未知
如果你想终止与internet的连接,可以使用VB来断开连接。 
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怎样用VB断开与internet的连接?

如果你想终止与internet的连接,可以使用断开连接的方法,首先你必须声明以下函数和变量:

Declarations

Public Const RAS_MAXENTRYNAME As Integer = 256Public Const RAS_MAXDEVICETYPE As Integer = 16

Public Const RAS_MAXDEVICENAME As Integer = 128

Public Const RAS_RASCONNSIZE As Integer = 412Public Const ERROR_SUCCESS = 0&

Public Type RasEntryName

dwSize As Long

szEntryName(RAS_MAXENTRYNAME) As Byte

End Type

Public Type RasConn

dwSize As Long

hRasConn As Long

szEntryName(RAS_MAXENTRYNAME) As Byte

szDeviceType(RAS_MAXDEVICETYPE) As Byte

szDeviceName(RAS_MAXDEVICENAME) As Byte

End Type

Public Declare Function RasEnumConnections Lib _

"rasapi32.dll" Alias "RasEnumConnectionsA" (lpRasConn As _

Any, lpcb As Long, lpcConnections As Long) As Long

Public Declare Function RasHangUp Lib "rasapi32.dll" Alias _

"RasHangUpA" (ByVal hRasConn As Long) As Long 

Public gstrISPName As String

Public ReturnCode As Long

断开过程:

Public Sub HangUp()

Dim i As Long

Dim lpRasConn(255) As RasConn

Dim lpcb As Long

Dim lpcConnections As Long

Dim hRasConn As Long

lpRasConn(0).dwSize = RAS_RASCONNSIZE

lpcb = RAS_MAXENTRYNAME * lpRasConn(0).dwSize

lpcConnections = 0

ReturnCode = RasEnumConnections(lpRasConn(0), lpcb, _

lpcConnections)

If ReturnCode = ERROR_SUCCESS Then

For i = 0 To lpcConnections - 1

If Trim(ByteToString(lpRasConn(i).szEntryName)) _

= Trim(gstrISPName) Then

hRasConn = lpRasConn(i).hRasConn

ReturnCode = RasHangUp(ByVal hRasConn)

End If

Next i

End If

End Sub

Public Function ByteToString(bytString() As Byte) As String

Dim i As Integer

ByteToString = ""

i = 0

While bytString(i) = 0&

ByteToString = ByteToString & Chr(bytString(i))

i = i + 1

Wend

End Function

调用断开过程:

Call HangUp
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