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GET IP ADDRESS!!! (V.SIMPLE) + (annoted to help!)

by DS2003 (1 Submission)
Category: Windows System Services
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Fri 14^th November 2003
Date Added: Mon 8^th February 2021
Rating: (1 Votes)

GET IP ADDRESS!!! (V.SIMPLE) + (annoted to help!)

API Declarations


Public Const MAX_WSADescription As Long = 256
Public Const MAX_WSASYSStatus As Long = 128
Public Const ERROR_SUCCESS As Long = 0
Public Const WS_VERSION_REQD As Long = &H101
Public Const WS_VERSION_MAJOR As Long = WS_VERSION_REQD \ &H100 And &HFF&
Public Const WS_VERSION_MINOR As Long = WS_VERSION_REQD And &HFF&
Public Const MIN_SOCKETS_REQD As Long = 1
Public Const SOCKET_ERROR As Long = -1

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

Public 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

Public Declare Function WSAGetLastError Lib "wsock32" () As Long

Public Declare Function WSAStartup Lib "wsock32" (ByVal wVersionRequired As Long, lpWSADATA As WSADATA) As Long
Public Declare Function WSACleanup Lib "wsock32" () As Long

Public Declare Function gethostname Lib "wsock32" (ByVal szHost As String, ByVal dwHostLen As Long) As Long

Public Declare Function gethostbyname Lib "wsock32" _
(ByVal szHost As String) As Long
Public Declare Sub CopyMemory Lib "kernel32" _
Alias "RtlMoveMemory" (hpvDest As Any, _
ByVal hpvSource As Long, _
ByVal cbCopy As Long)




Public Function GetIPAddress() 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

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

'gethostname returns the name of the local host into
'the buffer specified by the name parameter. The host
'name is returned as a null-terminated string. The
'form of the host name is dependent on the Windows
'Sockets provider - it can be a simple host name, or
'it can be a fully qualified domain name. However, it
'is guaranteed that the name returned will be successfully
'parsed by gethostbyname and WSAAsyncGetHostByName.

'In actual application, if no local host name has been
'configured, gethostname must succeed and return a token
'host name that gethostbyname or WSAAsyncGetHostByName
'can resolve.
If gethostname(sHostName, 256) = SOCKET_ERROR Then
GetIPAddress = ""
MsgBox "Windows Sockets error " & Str$(WSAGetLastError()) & _
" has occurred. Unable to successfully get Host Name."
SocketsCleanup
Exit Function
End If

'gethostbyname returns a pointer to a HOSTENT structure
'- a structure allocated by Windows Sockets. The HOSTENT
'structure contains the results of a successful search
'for the host specified in the name parameter.

'The application must never attempt to modify this
'structure or to free any of its components. Furthermore,
'only one copy of this structure is allocated per thread,
'so the application should copy any information it needs
'before issuing any other Windows Sockets function calls.

'gethostbyname function cannot resolve IP address strings
'passed to it. Such a request is treated exactly as if an
'unknown host name were passed. Use inet_addr to convert
'an IP address string the string to an actual IP address,
'then use another function, gethostbyaddr, to obtain the
'contents of the HOSTENT structure.
sHostName = Trim$(sHostName)
lpHost = gethostbyname(sHostName)

If lpHost = 0 Then
GetIPAddress = ""
MsgBox "Windows Sockets are not responding. " & _
"Unable to successfully get Host Name."
SocketsCleanup
Exit Function
End If

'to extract the returned IP address, we have to copy
'the HOST structure and its members
CopyMemory HOST, lpHost, Len(HOST)
CopyMemory dwIPAddr, HOST.hAddrList, 4

'create an array to hold the result
ReDim tmpIPAddr(1 To HOST.hLen)
CopyMemory tmpIPAddr(1), dwIPAddr, HOST.hLen

'and with the array, build the actual address,
'appending a period between members
For i = 1 To HOST.hLen
sIPAddr = sIPAddr & tmpIPAddr(i) & "."
Next

'the routine adds a period to the end of the
'string, so remove it here
GetIPAddress = Mid$(sIPAddr, 1, Len(sIPAddr) - 1)

SocketsCleanup

End Function


Public Function GetIPHostName() As String

Dim sHostName As String * 256


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