如何在程序里返回一个已知域名的IP地址

需要控件 list1 text1 cmdGet(commandButton) cmdExit(commandButton)
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modWinsock.Bas (模块)
Option ExplicitPublic Const INADDR_NONE = &HFFFF
Public Const SOCKET_ERROR = -1
Public Const WSABASEERR = 10000
Public Const WSAEFAULT = (WSABASEERR + 14)
Public Const WSAEINVAL = (WSABASEERR + 22)
Public Const WSAEINPROGRESS = (WSABASEERR + 50)
Public Const WSAENETDOWN = (WSABASEERR + 50)
Public Const WSASYSNOTREADY = (WSABASEERR + 91)
Public Const WSAVERNOTSUPPORTED = (WSABASEERR + 92)
Public Const WSANOTINITIALISED = (WSABASEERR + 93)
Public Const WSAHOST_NOT_FOUND = 11001
Public Const WSADESCRIPTION_LEN = 257
Public Const WSASYS_STATUS_LEN = 129
Public Const WSATRY_AGAIN = 11002
Public Const WSANO_RECOVERY = 11003
Public Const WSANO_DATA = 11004Public Type WSAData
    wVersion       As Integer
    wHighVersion   As Integer
    szDescription  As String * WSADESCRIPTION_LEN
    szSystemStatus As String * WSASYS_STATUS_LEN
    iMaxSockets    As Integer
    iMaxUdpDg      As Integer
    lpVendorInfo   As Long
End TypePublic Type HOSTENT
    hName     As Long
    hAliases  As Long
    hAddrType As Integer
    hLength   As Integer
    hAddrList As Long
End TypePublic Type servent
    s_name    As Long
    s_aliases As Long
    s_port    As Integer
    s_proto   As Long
End TypePublic Type protoent
    p_name    As String     '协议的官方名
    p_aliases As Long       'Null-terminated array of alternate names
    p_proto   As Long       'Protocol number, in host byte order
End TypePublic Declare Function WSACleanup Lib "ws2_32.dll" () As LongPublic Declare Function inet_ntoa Lib "ws2_32.dll" (ByVal inn As Long) As LongPublic Declare Function inet_addr Lib "ws2_32.dll" (ByVal cp As String) As LongPublic Declare Function htonl Lib "ws2_32.dll" (ByVal hostlong As Long) As LongPublic Declare Function ntohl Lib "ws2_32.dll" (ByVal netlong As Long) As LongPublic Declare Function ntohs Lib "ws2_32.dll" (ByVal netshort As Integer) As IntegerPublic Declare Function htons Lib "ws2_32.dll" (ByVal hostshort As Integer) As IntegerPublic Declare Function getprotobynumber Lib "ws2_32.dll" (ByVal proto As Long) As LongPublic Declare Function gethostbyname Lib "ws2_32.dll" (ByVal host_name As String) As LongPublic Declare Function getprotobyname Lib "ws2_32.dll" (ByVal proto_name As String) As LongPublic Declare Function lstrlen Lib "kernel32" Alias "lstrlenA" (ByVal lpString As Any) As LongPublic Declare Function WSAStartup Lib "ws2_32.dll" (ByVal wVR As Long, lpWSAD As WSAData) As LongPublic Declare Function getservbyport Lib "ws2_32.dll" (ByVal port As Integer, ByVal proto As Long) As LongPublic Declare Function gethostbyaddr Lib "ws2_32.dll" (addr As Long, ByVal addr_len As Long, _
                                                        ByVal addr_type As Long) As LongPublic Declare Function gethostname Lib "ws2_32.dll" (ByVal host_name As String, ByVal namelen As Long) As LongPublic Declare Function getservbyname Lib "ws2_32.dll" (ByVal serv_name As String, ByVal proto As String) As LongPublic Declare Sub RtlMoveMemory Lib "kernel32" (hpvDest As Any, ByVal hpvSource As Long, ByVal cbCopy As Long)Public Declare Function lstrcpy Lib "kernel32" Alias "lstrcpyA" (ByVal lpString1 As String, _
                                                                 ByVal lpString2 As Long) As LongPrivate Const OFFSET_4 = 4294967296#
Private Const MAXINT_4 = 2147483647
Private Const OFFSET_2 = 65536
Private Const MAXINT_2 = 32767Public Function UnsignedToLong(Value As Double) As Long
    'The function takes a Double containing a value in the range of an unsigned Long
    'and returns a Long that you can pass to an API that requires an unsigned Long

    If Value < 0 Or Value >= OFFSET_4 Then Error 6          '溢出
    If Value <= MAXINT_4 Then
        UnsignedToLong = Value
    Else
        UnsignedToLong = Value - OFFSET_4
    End If
End FunctionPublic Function LongToUnsigned(Value As Long) As Double
'这个函数从API中取一个无符号长取型数，将它转换成一个双精度型
    If Value < 0 Then
        LongToUnsigned = Value + OFFSET_4
    Else
        LongToUnsigned = Value
    End If
End FunctionPublic Function UnsignedToInteger(Value As Long) As Integer
    'The function takes a Long containing a value in the range of an unsigned Integer and
    'returns an Integer that you can pass to an API that requires an unsigned Integer

    If Value < 0 Or Value >= OFFSET_2 Then Error 6 ' Overflow
    If Value <= MAXINT_2 Then
        UnsignedToInteger = Value
    Else
        UnsignedToInteger = Value - OFFSET_2
    End If
End FunctionPublic Function IntegerToUnsigned(Value As Integer) As Long
    'The function takes an unsigned Integer from and API and?
    'converts it to a Long for display or arithmetic purposes
    If Value < 0 Then
        IntegerToUnsigned = Value + OFFSET_2
    Else
        IntegerToUnsigned = Value
    End If
End FunctionPublic Function StringFromPointer(ByVal lPointer As Long) As String
    Dim strTemp As String
    Dim lRetVal As Long    strTemp = String$(lstrlen(ByVal lPointer), 0)           '准备strTemp字符串的缓存
    lRetVal = lstrcpy(ByVal strTemp, ByVal lPointer)        '复制字符串到strTemp缓存中
    If lRetVal Then StringFromPointer = strTemp             '返回一个字符串
End Function__________________________________________________________________

frmMain.frm (主窗体)
Private Sub cmdGet_Click()
    '通过gethostbyname函数得到HOSTENT结构
Dim lngPtrToHOSTENT As Long
    Dim udtHostent      As HOSTENT          '存储所有host信息的结构
    Dim lngPtrToIP      As Long             '指向IP地址列表
    Dim arrIpAddress()  As Byte             'byte array that contains elemets of an IP address
    Dim strIpAddress    As String           '将得到IP地址增加到列表框中
    List1.Clear                             '清除List1列表框
                                            '调用Winsock的getthostbyname函数，得到HOSTENT结构
    lngPtrToHOSTENT = gethostbyname(Trim$(Text1.Text))
    '
    If lngPtrToHOSTENT = 0 Then             '检测lngPtrToHOSTENT的值
        '如果gethostbyname函数返回0，则函数执行失败。要得到错误说明，请调用ShowErrorMsg子例程。
        ShowErrorMsg (Err.LastDllError)
    Else
        'gethostbyname函数找到一个IP地址，复制找到的数据到udtHostent结构中
        RtlMoveMemory udtHostent, lngPtrToHOSTENT, LenB(udtHostent)
        'Now udtHostent.hAddrList member contains an array of IP addresses
        RtlMoveMemory lngPtrToIP, udtHostent.hAddrList, 4                   '指向第一个IP地址

        Do Until lngPtrToIP = 0
            ReDim arrIpAddress(1 To udtHostent.hLength)                     '准备一个数组来接收IP地址值
            RtlMoveMemory arrIpAddress(1), lngPtrToIP, udtHostent.hLength   '移动IP地址的值到数级中
            For i = 1 To udtHostent.hLength                                 '用IP地址来建立字符串
                strIpAddress = strIpAddress & arrIpAddress(i) & "."
            Next

            strIpAddress = Left$(strIpAddress, Len(strIpAddress) - 1)       '移走最后一个点
            List1.AddItem strIpAddress                                      '增加IP地址到列表框中
            strIpAddress = ""                                               '清除缓存
            udtHostent.hAddrList = udtHostent.hAddrList + LenB(udtHostent.hAddrList)    '指向下一个IP地址
            RtlMoveMemory lngPtrToIP, udtHostent.hAddrList, 4
         Loop
    End If
End SubPrivate Sub Form_Load()
Dim lngRetVal      As Long
Dim strErrorMsg    As String
Dim udtWinsockData As WSAData
Dim lngType        As Long
Dim lngProtocol    As Long

    lngRetVal = WSAStartup(&H101, udtWinsockData)       '启动Winsock服务
    If lngRetVal <> 0 Then
        Select Case lngRetVal
            Case WSASYSNOTREADY
                strErrorMsg = "The underlying network subsystem is not " & _
                    "ready for network communication."
            Case WSAVERNOTSUPPORTED
                strErrorMsg = "The version of Windows Sockets API support " & _
                    "requested is not provided by this particular " & _
                    "Windows Sockets implementation."
            Case WSAEINVAL
                strErrorMsg = "The Windows Sockets version specified by the " & _
                    "application is not supported by this DLL."
        End Select

        MsgBox strErrorMsg, vbCritical
    End If
End SubPrivate Sub Form_Unload(Cancel As Integer)
    Call WSACleanup
End SubPrivate Sub ShowErrorMsg(lngError As Long)
Dim strMessage As String

    Select Case lngError
        Case WSANOTINITIALISED
            strMessage = "A successful WSAStartup call must occur " & "before using this function."
        Case WSAENETDOWN
            strMessage = "The network subsystem has failed."
        Case WSAHOST_NOT_FOUND
            strMessage = "Authoritative answer host not found."
        Case WSATRY_AGAIN
            strMessage = "Nonauthoritative host not found, or server failure."
        Case WSANO_RECOVERY
            strMessage = "A nonrecoverable error occurred."
        Case WSANO_DATA
            strMessage = "Valid name, no data record of requested type."
        Case WSAEINPROGRESS
            strMessage = "A blocking Windows Sockets 1.1 call is in " & _
                         "progress, or the service provider is still " & _
                         "processing a callback function."
        Case WSAEFAULT
            strMessage = "The name parameter is not a valid part of " & "the user address space."
        Case WSAEINTR
            strMessage = "A blocking Windows Socket 1.1 call was " & "canceled through WSACancelBlockingCall."
    End Select

    MsgBox strMessage, vbExclamation
End SubPrivate Sub cmdExit_Click()
    Unload Me
End Sub___________________________________________________VB6 WindowXP SP2 调试通过

[名称]           vb中从域名得到IP及从IP得到域名[语言种类]       Visual Basic[类别一]         因特网[类别二]         网络通信[类别三]         空[数据来源]       未知[来源时间]       未知[保存时间]       2003-01-03[关键字一]       域名[关键字二]       IP[关键字三]       API[文件列表]       空[内容简介]       空[心得体会]       空[源代码内容]Private Const WS_VERSION_REQD = &H101
Private Const WS_VERSION_MAJOR = WS_VERSION_REQD \ &H100 And &HFF&
Private Const WS_VERSION_MINOR = WS_VERSION_REQD And &HFF&
Private Const MIN_SOCKETS_REQD = 1
Private Const SOCKET_ERROR = -1
Private Const WSADescription_Len = 256
Private Const WSASYS_Status_Len = 128Private Type HOSTENT
   hname As Long
   hAliases As Long
   hAddrType As Integer
   hLength As Integer
   hAddrList As Long
End TypePrivate Type WSADATA
   wversion As Integer
   wHighVersion As Integer
   szDescription(0 To WSADescription_Len) As Byte
   szSystemStatus(0 To WSASYS_Status_Len) As Byte
   iMaxSockets As Integer
   iMaxUdpDg As Integer
   lpszVendorInfo As Long
End Type
Private Declare Function gethostbyaddr Lib "WSOCK32.DLL" (addr As Any, ByVal _
byteslen As Integer, addrtype As Integer) As Long
Private Declare Function WSAGetLastError Lib "WSOCK32.DLL" () As Long
Private Declare Function WSAStartup Lib "WSOCK32.DLL" (ByVal _
        wVersionRequired&, lpWSAData As WSADATA) As Long
Private Declare Function WSACleanup Lib "WSOCK32.DLL" () As Long
Private Declare Function gethostbyname Lib "WSOCK32.DLL" (ByVal _
        hostname$) As Long
Private Declare Sub RtlMoveMemory Lib "KERNEL32" (hpvDest As Any, _
        ByVal hpvSource&, ByVal cbCopy&)Function hibyte(ByVal wParam As Integer)    '获得整数的高位
   hibyte = wParam \ &H100 And &HFF&
End FunctionFunction lobyte(ByVal wParam As Integer)    '获得整数的低位
   lobyte = wParam And &HFF&
End FunctionFunction SocketsInitialize()
   Dim WSAD As WSADATA
   Dim iReturn As Integer
   Dim sLowByte As String, sHighByte As String, sMsg As String

   iReturn = WSAStartup(WS_VERSION_REQD, WSAD)

   If iReturn <> 0 Then
      MsgBox "Winsock.dll 没有反应."
      End
   End If

   If lobyte(WSAD.wversion) < WS_VERSION_MAJOR Or (lobyte(WSAD.wversion) = WS_VERSION_MAJOR And hibyte(WSAD.wversion) < WS_VERSION_MINOR) Then
      sHighByte = Trim$(str$(hibyte(WSAD.wversion)))
      sLowByte = Trim$(str$(lobyte(WSAD.wversion)))
      sMsg = "Windows Sockets版本 " & sLowByte & "." & sHighByte
      sMsg = sMsg & " 不被winsock.dll支持 "
      MsgBox sMsg
      End
   End If

   If WSAD.iMaxSockets < MIN_SOCKETS_REQD Then
      sMsg = "这个系统需要的最少Sockets数为 "
      sMsg = sMsg & Trim$(str$(MIN_SOCKETS_REQD))
      MsgBox sMsg
      End
   End If

End FunctionSub SocketsCleanup()
   Dim lReturn As Long

   lReturn = WSACleanup()

   If lReturn <> 0 Then
      MsgBox "Socket错误 " & Trim$(str$(lReturn)) & " occurred in Cleanup "
      End
   End If
End Sub
Sub Form_Load()
    '初始化Socket
    SocketsInitialize
End SubPrivate Sub Form_Unload(Cancel As Integer)
    '清除Socket
    SocketsCleanup
End Sub
Private Function getip(name As String) As String
   Dim hostent_addr As Long
   Dim host As HOSTENT
   Dim hostip_addr As Long
   Dim temp_ip_address() As Byte
   Dim i As Integer
   Dim ip_address As String

   hostent_addr = gethostbyname(name)

   If hostent_addr = 0 Then
      getip = ""                     '主机名不能被解释
      Exit Function
   End If

   RtlMoveMemory host, hostent_addr, LenB(host)
   RtlMoveMemory hostip_addr, host.hAddrList, 4

   ReDim temp_ip_address(1 To host.hLength)
   RtlMoveMemory temp_ip_address(1), hostip_addr, host.hLength

   For i = 1 To host.hLength
      ip_address = ip_address & temp_ip_address(i) & "."
   Next
   ip_address = Mid$(ip_address, 1, Len(ip_address) - 1)

   getip = ip_addressEnd FunctionPrivate Sub Command1_click()
    Dim str As String
    str = getip(Text1.Text)
    If str = "" Then
        Text2.Text = "主机名不能被解释"
    Else
        Text2.Text = str
    End If
End Sub
Private Function getname(addrstr As String) As String
    Dim hostent_addr As Long
    Dim host As HOSTENT
    Dim addr(0 To 50) As Byte
    Dim addrs As String
    Dim hname(1 To 50) As Byte
    Dim str As String
    Dim i As Integer, j As Integer
    Dim temp_int As Integer
    Dim byt As Byte
    str = Trim$(addrstr)
    i = 0
    j = 0
    Do
        temp_int = 0
        i = i + 1
        Do While Mid$(str, i, 1) >= "0" And Mid$(str, i, 1) <= "9" And i <= Len(str)
            temp_int = temp_int * 10 + Mid$(str, i, 1)
            i = i + 1
        Loop
        If temp_int <= 255 Then
            addr(j) = temp_int
            j = j + 1
        End If

    Loop Until Mid$(str, i, 1) <> "." Or i > Len(str) Or temp_int > 255
    If temp_int > 255 Then
        getname = "地址非法"
        Exit Function
    End If
    hostent_addr = gethostbyaddr(addr(0), j, 2)
    If hostent_addr = 0 Then
        getname = "此地址无法解析"
        Exit Function
    End If
    RtlMoveMemory host, hostent_addr, LenB(host)
    RtlMoveMemory hname(1), host.hname, 50
    j = 51
    For i = 1 To 50
        If hname(i) = 0 Then
            j = i
        End If
        If i >= j Then
            hname(i) = 32
        End If
    Next i
    getname = Trim$(StrConv(hname, vbUnicode))
End Function
Private Sub Command2_Click()
    Dim name As String
    name = getname(Text2.Text)
    If name = "" Then
        name = "此地址没有域名"
    End If
    Text1.Text = name
End Sub
     以上代码保存于： SourceCode Explorer(源代码数据库)
           复制时间： 2005-10-24 21:54:55
           软件版本： 1.0.881
           软件作者： Shawls
             E-Mail： [email protected]
                 QQ： 9181729

楼上 shawls 的代码不错。收藏，thanks!

好费劲啊，俺来两句：
Shell "cmd /c ping www.163.com >d:\ip.txt", vbHide '生成ip.txt
然后读取ip.txt,不就OK了么？

调试易

如何在程序里返回一个已知域名的IP地址

解决方案 »