如何获得本机真实IP地址

[zansan]

我用WINSOCK的LocalIP得到一个地址,然后查询连接状态里显示的本机IP(客户端IP地址),这两个地址不相同.
开始我想可能与网关有关系,我就想找出两者间的关系.于是试了几次(断开连接,连接),几次的结果是LocalIP固定不变,而(客户端IP地址)就改变.这就近是怎么回事?

[迈克揉索芙特]

Option Explicit

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&
Private Const AF_INET As Long = 2

Private Type HOSTENT
hName As Long
hAliases As Long
hAddrType As Integer
hLen As Integer
hAddrList As Long
End Type

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

Private 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)

Private Declare Function inet_addr Lib "wsock32" (ByVal s As String) As Long
Private Declare Function gethostbyaddr Lib "wsock32" (haddr As Long, ByVal hnlen As Long, ByVal addrtype As Long) As Long
Private Declare Function lstrlen Lib "kernel32" Alias "lstrlenA" (lpString As Any) As Long

Function GetIPAddress(Optional sHost As String) As String
'返回给定机器名的Ip地址，机器名为空时返回本机Ip地址
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

If Not SocketsInitialize() Then
GetIPAddress = ""
Exit Function
End If

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

lpHost = gethostbyname(sHostName)

If lpHost = 0 Then
werr = WSAGetLastError()
GetIPAddress = ""
SocketsCleanup
Exit Function
End If

CopyMemory HOST, lpHost, Len(HOST)
CopyMemory dwIPAddr, HOST.hAddrList, 4

ReDim tmpIPAddr(1 To HOST.hLen)
CopyMemory tmpIPAddr(1), dwIPAddr, HOST.hLen

For i = 1 To HOST.hLen
sIPAddr = sIPAddr & tmpIPAddr(i) & "."
Next

GetIPAddress = Mid$(sIPAddr, 1, Len(sIPAddr) - 1)
SocketsCleanup
End Function

Private Function SocketsInitialize(Optional sErr As String) As Boolean
Dim WSAD As WSADATA, sLoByte As String, sHiByte As String
If WSAStartup(WS_VERSION_REQD, WSAD) <> ERROR_SUCCESS Then
sErr = "The 32-bit Windows Socket is not responding."
SocketsInitialize = False
Exit Function
End If

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


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

Private Sub SocketsCleanup()
If WSACleanup() <> ERROR_SUCCESS Then
App.LogEvent "Socket error occurred in Cleanup.", vbLogEventTypeError
End If
End Sub

Private Function HiByte(ByVal wParam As Integer)
HiByte = wParam \ &H1 And &HFF&
End Function

Private Function LoByte(ByVal wParam As Integer)
LoByte = wParam And &HFF&
End Function


'Private Function SocketsInitialize() As Boolean
'
' Dim WSAD As WSADATA
'
' SocketsInitialize = WSAStartup(WS_VERSION_REQD, WSAD) = IP_SUCCESS
'
'End Function


Public Function GetHostNameFromIP(ByVal sAddress As String) As String

Dim ptrHosent As Long
Dim hAddress As Long
Dim nbytes As Long

If SocketsInitialize() Then

'convert string address to long
hAddress = inet_addr(sAddress)

If hAddress <> SOCKET_ERROR Then

'obtain a pointer to the HOSTENT structure
'that contains the name and address
'corresponding to the given network address.
ptrHosent = gethostbyaddr(hAddress, 4, AF_INET)

If ptrHosent <> 0 Then

'convert address and
'get resolved hostname
CopyMemory ptrHosent, ByVal ptrHosent, 4
nbytes = lstrlen(ByVal ptrHosent)

If nbytes > 0 Then
sAddress = Space$(nbytes)
CopyMemory ByVal sAddress, ByVal ptrHosent, nbytes
GetHostNameFromIP = sAddress
End If

Else
' MsgBox "Call to gethostbyaddr failed."
End If 'If ptrHosent

SocketsCleanup

Else
MsgBox "String passed is an invalid IP."
End If 'If hAddress

Else
MsgBox "Sockets failed to initialize."
End If 'If SocketsInitialize

End Function

[zansan]

我试了一下,使用GetIPAddress与WINSOCK的LocalIP一样.还是没得到真实的IP.

[zansan]

我已找到解决办法:
http://community.csdn.net/Expert/topic/4521/4521803.xml?temp=.9996607
虽然需要依赖"whatismyip.org".

[wk_1978]

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[l_john2000]

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[八哥]

如果是WINDOS系统.,WIN95.WIN me, WIN_NT,WIN_XP ,WIN_2000,WIN_2003
他们支持WMI接口,通过下面语句查讯,可以得到绑在网卡上的所有IP地址

Select * from Win32_NetworkAdapterConfiguration where IPEnabled=TRUE