'===========================================
'Desc:获取本机IP地址和子网掩码
'Author:yoyoba(stuyou@126.com)
'Date:2007-11-28
'Modify:2007-12-6
'===========================================
Option Explicit
Public WithEvents vpcap As vbPacket '声明一个使用vbpcap事件的vpcap对象变量
Dim AdapterString As String * 1000 'GetAdapterNames函数返回的网卡名，存放于该变量
Dim selAdapterName As String '在List列表中被选中网卡的名字
Private Sub Command2_Click()
    vpcap.CloseAdapter
    End
End Sub
Private Sub Form_Load()
    Set vpcap = New vbPacket '为对象变量vpcap赋值
    Dim NumAdapter As Long 'GetAdapterNames函数返回的网卡数，存放于该变量
    Dim AdapterList
    Dim i As Integer
   
    NumAdapter = vpcap.GetAdapterNames(AdapterString) '调用GetAdapterNames函数。获得本机网卡名字
    If NumAdapter = 0 Then
        MsgBox "Founded NONE adapter!,please check it!"
    End If
   
    AdapterList = Split(AdapterString, vbNullChar) '把获得得网卡名置于List控件中
    For i = 0 To NumAdapter
        List1.AddItem AdapterList(i)
    Next i
   
End Sub
Private Sub Command1_Click()

    Dim NetIP As Long '返回该网卡的IP
    Dim NetMask As Long '返回该网卡的掩码
   
    selAdapterName = List1.Text 'SetAdapterName为在List中选中的网卡
   
    If selAdapterName = "" Then
        MsgBox "You have not selected a adapter!"
    Else
        vpcap.GetNetInfo selAdapterName, NetIP, NetMask '调用GetNetInfo函数，获取IP和submask
        Text1.Text = GetIpFromLong(NetIP) '调用在getip_4byte模块中定义的GetIpFromLong函数，_
                                                        '把Long型的NetIp转换成4字节表示的IP地址表示法
        Text2.Text = GetIpFromLong(NetMask)
    End If
   
   
End Sub

Option Explicit
Public Declare Sub memcpy Lib "kernel32" Alias _
               "RtlMoveMemory" (ByRef Destination As Any, _
                ByRef Source As Any, ByVal Length As Long) '调用WindowsAPI，使用memcpy库中的函数，把一个4字节的long数据转换成4个byte数据, '_该声明必须放在模块或类中，不能放在窗体中
'=====================================================
'Name:GetIpFromLong
'Desc:把一个long型数据表示的IP地址转换成点分10进制表示
'Parameters:[in]lngIPAddress:以long型数据表示的IP地址
'Return: 点分10进制表示的IP地址，String类型
'Author:yoyoba(stuyou@126.com)
'Date:2007-11-28
'Modify:2007-11-28
'=====================================================
Public Function GetIpFromLong(lngIPAddress As Long) As String '声明函数，用来把4字节的long数据转换成4个byte数据
    Dim arrIpParts(3) As Byte
    memcpy arrIpParts(0), lngIPAddress, 4 '调用memcpy函数
    GetIpFromLong = CStr(arrIpParts(3)) & "." & _
                    CStr(arrIpParts(2)) & "." & _
                    CStr(arrIpParts(1)) & "." & _
                    CStr(arrIpParts(0))
End Function