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vb中从域名得到IP及从IP得到域名
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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 = 128
Private Type HOSTENT
hname As Long
hAliases As Long
hAddrType As Integer
hLength As Integer
hAddrList As Long
End Type
Private 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$) As Long
Private Declare Sub RtlMoveMemory Lib "KERNEL32" (hpvDest As Any, _
ByVal hpvSource, ByVal cbCopy)
Function hibyte(ByVal wParam As Integer) 注释：获得整数的高位
hibyte = wParam H100 And HFF
End Function
Function lobyte(ByVal wParam As Integer) 注释：获得整数的低位
lobyte = wParam And HFF
End Function
Function SocketsInitialize()
Dim WSAD As WSADATA
Dim iReturn As Integer
Dim sLowByte As String, sHighByte As String, sMsg As String
iReturn = WSAStartup(WS_VERSION_REQD, WSAD)
If iReturn 0 Then
MsgBox "Winsock.dll 没有反应."
End
End If
If lobyte(WSAD.wversion) WS_VERSION_MAJOR Or (lobyte(WSAD.wversion) = WS_VERSION_MAJOR And hibyte(WSAD.wversion) WS_VERSION_MINOR) Then
sHighByte = Trim$(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$(MIN_SOCKETS_REQD))
MsgBox sMsg
End
End If
End Function
Sub SocketsCleanup()
Dim lReturn As Long
lReturn = WSACleanup()
If lReturn 0 Then
MsgBox "Socket错误 " Trim$(str$(lReturn)) " occurred in Cleanup "
End
End If
End Sub
Sub Form_Load()
注释：初始化Socket
SocketsInitialize
End Sub
Private Sub Form_Unload(Cancel As Integer)
注释：清除Socket
SocketsCleanup
End Sub
Private Function getip(name As String) As String
Dim hostent_addr As Long
Dim host As HOSTENT
Dim hostip_addr As Long
Dim temp_ip_address() As Byte
Dim i As Integer
Dim ip_address As String
hostent_addr = gethostbyname(name)
If hostent_addr = 0 Then
getip = "" 注释：主机名不能被解释
Exit Function
End If
RtlMoveMemory host, hostent_addr, LenB(host)
RtlMoveMemory hostip_addr, host.hAddrList, 4
ReDim temp_ip_address(1 To host.hLength)
RtlMoveMemory temp_ip_address(1), hostip_addr, host.hLength
For i = 1 To host.hLength
ip_address = ip_address temp_ip_address(i) "."
Next
ip_address = Mid$(ip_address, 1, Len(ip_address) - 1)
getip = ip_address
End Function
Private 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
直接对服务器请求。（该服务器要有相对的功能,连线后控件属性即包含，可设置自动回报）
找一个网页，内容含有显示浏览者ip的网址。抓该网页的内容分析获取外网的字串。
提供一个安全网址给你：
是APNIC亚洲数据中心的首页 的子页
像藤蔓的树般，越来越强烈。
还有上了门的商铺，遮阳布上
我曾用太阳对你说，它在一切纯贞的事物上微笑，将青春的躯体染成金色
撼动了丛林和房屋。
我的朋友肯定是只鸟--
如一么中雾中的花一样神秘。哈哈
vb 如何获取外网ip代码：
'获取公网IP
Private Declare Function InternetOpen Lib "wininet.dll" Alias "InternetOpenA" ( _
ByVal sAgent As String, ByVal lAccessType As Long, _
ByVal sProxyName As String, ByVal sProxyBypass As String, _
ByVal lFlags As Long) As Long
Private Declare Function InternetOpenUrl Lib "wininet.dll" Alias "InternetOpenUrlA" ( _
ByVal hInternetSession As Long, ByVal sUrl As String, _
ByVal sHeaders As String, ByVal lHeadersLength As Long, _
ByVal lFlags As Long, ByVal lContext As Long) As Long
Private Declare Function InternetReadFile Lib "wininet.dll" ( _
ByVal hFile As Long, ByVal sBuffer As String, _
ByVal lNumBytesToRead As Long, _
lNumberOfBytesRead As Long) As Integer
Private Declare Function InternetCloseHandle Lib "wininet.dll" ( _
ByVal hInet As Long) As Integer
Private Const INTERNET_FLAG_NO_CACHE_WRITE = H4000000
Private Declare Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA" (ByVal pCaller As Long, ByVal szURL As String, ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long
Public Function GetSub() As String
Dim wburl$, wburl2$, X1, X2, X3, X4
On Error GoTo err
wburl = ""
wburl = GetUrlFile(wburl)
If InStr(1, wburl, "无法找到该页") = 0 Then
X1 = InStr(1, wburl, "[")
X2 = InStr(1, wburl, "]")
X1 = Mid(wburl, X1, X2 - X1)
X1 = Replace(X1, "[", "")
X1 = Replace(X1, " ", "")
X1 = Replace(X1, vbCrLf, "")
GetSub = X1
Exit Function
End If
wburl2 = ""
wburl2 = GetUrlFile(wburl2)
If InStr(1, wburl2, "无法找到该页") = 0 Then
X3 = InStr(1, wburl2, "h2")
X4 = InStr(1, wburl2, "/h2")
X3 = Mid(wburl2, X3, X4 - X3)
X3 = Replace(X3, "h2", "")
X3 = Replace(X3, " ", "")
X3 = Replace(X3, vbCrLf, "")
GetSub = X3
Exit Function
Else
GetSub = "127.0.0.1"
End If
err:
GetSub = "127.0.0.1"
End Function
Private Function GetUrlFile(stUrl As String) As String
Dim lgInternet As Long, lgSession As Long
Dim stBuf As String * 1024
Dim inRes As Integer
Dim lgRet As Long
Dim stTotal As String
stTotal = vbNullString
lgSession = InternetOpen("VBTagEdit", 1, vbNullString, vbNullString, 0)
If lgSession Then
lgInternet = InternetOpenUrl(lgSession, stUrl, vbNullString, _
0, INTERNET_FLAG_NO_CACHE_WRITE, 0)
If lgInternet Then
Do
inRes = InternetReadFile(lgInternet, stBuf, 1024, lgRet)
stTotal = stTotal Mid$(stBuf, 1, lgRet)
Loop While (lgRet 0)
End If
inRes = InternetCloseHandle(lgInternet)
End If
GetUrlFile = stTotal
End Function
使用方法：
在form中调用GetSub就行了。
List1.AddItem ("公网IP:" GetSub + "..")。
Private Sub WebBrowser1_DocumentCompleted(ByVal sender As Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
Dim str As String
str = Me.WebBrowser1.Document.Body.InnerHtml
Dim a As Integer = 0
Dim b As Integer = 0
a = InStr(str, "[")
b = InStr(str, "]")
TextBox1.Text = Mid(str, a + 1, b - a - 1)
End Sub
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Me.WebBrowser1.Navigate("
)
End Sub
End Class
网页上显示的有点问题，form1_load 中代码是：Me.WebBrowser1.Navigate("")
原理：访问查IP网页后，获取网页上显示的本机外网ip地址
不是这样的， 它绑定你给它的IP （不分内外网），如果你的程序在服务器端（服务器必须有一个固定的IP）运行，你的代码读取本机IP时 就是那个固定IP了，当你的程序在动态DNS网络里运行时，读取的就是内网IP了，只有网络内的客户机才能连上，你用个办法查出外网IP ，直接给vb.net socket.bind，外网的人才能连接到你的 电脑，希望能帮到你
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