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Option ExplicitPrivate Declare Function gethostname Lib "WSOCK32.DLL" (ByVal szHost As String, ByVal dwHostLen As Long) As Long
Private Declare Function gethostbyname Lib "WSOCK32.DLL" (ByVal szHost As String) As Long
Private Declare Function WSAStartup Lib "WSOCK32.DLL" (ByVal wVersionRequired As Long, lpWSADATA As WSADATA) As Long
Private Declare Function WSAGetLastError Lib "WSOCK32.DLL" () As Long
Private Declare Function WSACleanup Lib "WSOCK32.DLL" () As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (hpvDest As Any, ByVal hpvSource As Long, ByVal cbCopy As Long)'  Socket错误常数和版本常数
Private Const SOCKET_ERROR As Long = -1
Private Const MAX_WSADescription = 256
Private Const MAX_WSASYSStatus = 128
Private Const ERROR_SUCCESS       As Long = 0
Private Const WS_VERSION_REQD     As Long = &H101
Private Const MIN_SOCKETS_REQD    As Long = 1
Private Const WS_VERSION_MAJOR    As Long = WS_VERSION_REQD \ &H100 And &HFF&
Private Const WS_VERSION_MINOR    As Long = WS_VERSION_REQD And &HFF&'  存放主机信息的结构
Private Type HOSTENT
    hName      As Long    '  主机的正式名称
    hAliases   As Long    '  主机别名列表
    hAddrType  As Integer '  主机地址类型
    hLen       As Integer '  主机地址长度
    hAddrList  As Long    '  主机IP地址列表
End Type'  存放Winsock版本等信息的结构
Private Type WSADATA
    wVersion      As Integer
    wHighVersion  As Integer
    szDescription(0 To MAX_WSADescription)   As Byte
    szSystemStatus(0 To MAX_WSASYSStatus)    As Byte
    wMaxSockets   As Integer
    wMaxUDPDG     As Integer
    dwVendorInfo  As Long
End Type'  返回给定机器名的Ip地址，机器名为空时返回本机Ip地址
Private Function GetIPAddress(Optional sHost As String) As String
    Dim sHostName   As String * 256
    Dim lpHost      As Long
    Dim HOST        As HOSTENT
    Dim dwIPAddr    As Long
    Dim tmpIPAddr() As Byte
    Dim i           As Integer
    Dim sIPAddr     As String
    Dim werr        As Long

    '  如果无法初始化Socket则退出函数
    If Not SocketsInitialize() Then
        GetIPAddress = ""
        Exit Function
    End If

    '  如果未指定主机名称，则取得本地主机名称并获取其IP
    If sHost = "" Then
        If gethostname(sHostName, 256) = SOCKET_ERROR Then
            werr = WSAGetLastError()
            GetIPAddress = ""
            SocketsCleanup
            Exit Function
        End If        sHostName = Trim$(sHostName)
    Else
        sHostName = Trim$(sHost) & Chr$(0)
    End If

    '  获得指向主机信息结构的指针
    lpHost = gethostbyname(sHostName)    '  如果指针为零，则错误退出
    If lpHost = 0 Then
        werr = WSAGetLastError()
        GetIPAddress = ""
        SocketsCleanup
        Exit Function
    End If

    '  从指定内存取得数据
    CopyMemory HOST, lpHost, Len(HOST)
    CopyMemory dwIPAddr, HOST.hAddrList, 4

    '  重新动态分配变量内存
    ReDim tmpIPAddr(1 To HOST.hLen)
    '  将主机地址存储到tmpIPAddr中
    CopyMemory tmpIPAddr(1), dwIPAddr, HOST.hLen

    '  获得最终的主机IP地址字符串
    For i = 1 To HOST.hLen
        sIPAddr = sIPAddr & tmpIPAddr(i) & "."
    Next    '  返回
    GetIPAddress = Mid$(sIPAddr, 1, Len(sIPAddr) - 1)

    ' 释放Socket库所占用的系统资源
    SocketsCleanup
End Function'  初始化Socket
Private Function SocketsInitialize(Optional sErr As String) As Boolean
    Dim WSAD As WSADATA
    Dim sLoByte As String
    Dim sHiByte As String

    '  初始化Winsock DLL，并判断版本是否满足要求
    If WSAStartup(WS_VERSION_REQD, WSAD) <> ERROR_SUCCESS Then
        sErr = "The 32-bit Windows Socket is not responding."
        SocketsInitialize = False
        Exit Function
    End If

    '  判断是否有支持足够的Socket
    If WSAD.wMaxSockets < MIN_SOCKETS_REQD Then
        sErr = "This application requires a minimum of " & _
                CStr(MIN_SOCKETS_REQD) & " supported sockets."
        SocketsInitialize = False
        Exit Function
    End If

    '  判断Winsock的版本是否被32为Winsock支持
    If LoByte(WSAD.wVersion) < WS_VERSION_MAJOR Or _
            (LoByte(WSAD.wVersion) = WS_VERSION_MAJOR And _
            HiByte(WSAD.wVersion) < WS_VERSION_MINOR) Then        sHiByte = CStr(HiByte(WSAD.wVersion))
        sLoByte = CStr(LoByte(WSAD.wVersion))        sErr = "Sockets version " & sLoByte & "." & sHiByte & _
                " is not supported by 32-bit Windows Sockets."        SocketsInitialize = False
        Exit Function
    End If

    SocketsInitialize = True
End Function' 释放Socket库所占用的系统资源
Private Sub SocketsCleanup()
    If WSACleanup() <> ERROR_SUCCESS Then
        App.LogEvent "Socket error occurred in Cleanup.", vbLogEventTypeError
    End If
End Sub'  获得一个整数的高字节位
Private Function HiByte(ByVal wParam As Integer)
    HiByte = wParam \ &H1 And &HFF&
End Function'  获得一个整数的低字节位
Private Function LoByte(ByVal wParam As Integer)
    LoByte = wParam And &HFF&
End FunctionPrivate Sub Command1_Click()
    On Error Resume Next
    Screen.MousePointer = vbHourglass
    TxtIp.Text = GetIPAddress(TxtCmpName.Text)
    Screen.MousePointer = vbDefault
End Sub

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