How do I determine my IP address.

My program needs to know the IP address assigned to the local compi. It uses a dialup connection.

winsock's local host returns 127.0.0.1; which does'nt help.

Anyone knows how to get the IP programmatically ?

Code:

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Public Const WS_VERSION_REQD = &H101
Public Const WS_VERSION_MAJOR = WS_VERSION_REQD \ &H100  And &HFF&
Public Const WS_VERSION_MINOR = WS_VERSION_REQD And &HFF&
Public Const MIN_SOCKETS_REQD = 1
Public Const SOCKET_ERROR = -1
Public Const WSADescription_Len = 256
Public Const WSASYS_Status_Len = 128

Public Type HOSTENT
    hName As Long
    hAliases As Long
    hAddrType As Integer
    hLength As Integer
    hAddrList As Long
End Type

Public 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

Public Declare Function WSAGetLastError Lib "WSOCK32.DLL" () As Long
Public Declare Function WSAStartup Lib "WSOCK32.DLL" (ByVal wVersionRequired&, lpWSAData As WSADATA) As Long
Public Declare Function WSACleanup Lib "WSOCK32.DLL" () As Long
Public Declare Function gethostname Lib "WSOCK32.DLL" (ByVal hostname$, ByVal HostLen As Long) As Long
Public Declare Function gethostbyname Lib "WSOCK32.DLL" (ByVal hostname$) As Long
Public Declare Sub RtlMoveMemory Lib "kernel32" (hpvDest As Any, ByVal hpvSource&, ByVal cbCopy&)

Function hibyte(ByVal wParam As Integer)
    hibyte = wParam \ &H100  And &HFF&
End Function


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


Sub 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 Error."
        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 version " & sLowByte & "." & sHighByte
        'sMsg = sMsg & " winsock.dll tarafindan desteklenmiyor. "
        MsgBox sMsg
        End
    End If

End Sub

Public Function CurrentIP(ReturnExternalIP As Boolean)
    Dim hostname As String * 256
    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
    Dim IP As String

    If gethostname(hostname, 256) = SOCKET_ERROR Then
        MsgBox "Windows Socket Error " & Str(WSAGetLastError())
        Exit Function
    Else
        hostname = Trim$(hostname)
    End If
    hostent_addr = gethostbyname(hostname)


    If hostent_addr = 0 Then
        MsgBox "Winsock.dll error."
        Exit Function
    End If
    RtlMoveMemory host, hostent_addr, LenB(host)
    RtlMoveMemory hostip_addr, host.hAddrList, 4
 
    Do
        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)
       
        Internal = TheIP        ' Send ONLY the External IP to the CurrentIP Function
        EXTERNAL = ip_address  ' Send the External IP to the  function parameter External
        TheIP = ip_address      ' Send LAN IP to the function para Internal
   
        ip_address = ""
        host.hAddrList = host.hAddrList + LenB(host.hAddrList)
        RtlMoveMemory hostip_addr, host.hAddrList, 4
    Loop While (hostip_addr <> 0)
   
   
If ReturnExternalIP = True Then
    CurrentIP = EXTERNAL
Else
    CurrentIP = Internal
End If
End Function

Sub SocketsCleanup()
    Dim lReturn As Long
    lReturn = WSACleanup()


    If lReturn <> 0 Then
        MsgBox "Socket Error " & Trim$(Str$(lReturn)) & " occurred In Cleanup "
        End
    End If
End Sub


Usage


Private Sub Command1_Click()
    SocketsInitialize
    Msgbox CurrentIP(True)
End Sub

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thanks for this.

But is there no direct way of doing it?
Without a nslookup for hostname ?

amit