Option Explicit

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

If gethostname(sHostName, 256) = SOCKET_ERROR Then
   GetIPAddress = ""
   MsgBox "Ocorre um erro de Socket : " & Str$(WSAGetLastError()) & " , não é possivel obter nome do Host."
   SocketsCleanup
   Exit Function
End If

sHostName = Trim$(sHostName)
lpHost = gethostbyname(sHostName)

If lpHost = 0 Then
  GetIPAddress = ""
  MsgBox "Windows Sockets não esta respondendo. " & "não é possivel obter nome do Host"
  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

Public Function GetIPHostName() As String

Dim sHostName As String * 256

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

If gethostname(sHostName, 256) = SOCKET_ERROR Then
  GetIPHostName = ""
  MsgBox "Windows Sockets error " & Str$(WSAGetLastError()) & " não é possivel obter nome do Host."
  SocketsCleanup
  Exit Function
End If

GetIPHostName = Left$(sHostName, InStr(sHostName, Chr(0)) - 1)
SocketsCleanup

End Function

Public Function HiByte(ByVal wParam As Integer) As Byte

HiByte = (wParam And &HFF00&) \ (&H100)

End Function

Public Function LoByte(ByVal wParam As Integer) As Byte

  LoByte = wParam And &HFF&

End Function

Public Sub SocketsCleanup()

If WSACleanup() <> ERROR_SUCCESS Then
  MsgBox " Erro de Socket."
End If

End Sub

Public Function SocketsInitialize() As Boolean

Dim WSAD As WSADATA
Dim sLoByte As String
Dim sHiByte As String

If WSAStartup(WS_VERSION_REQD, WSAD) <> ERROR_SUCCESS Then
  MsgBox "32-bit Windows Socket não esta respondendo."
  SocketsInitialize = False
  Exit Function
End If


If WSAD.wMaxSockets < MIN_SOCKETS_REQD Then
MsgBox " Esta aplicação requer um minimo de " & _
CStr(MIN_SOCKETS_REQD) & " sockets suportados."

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))

  MsgBox "A versao Sockets " & sLoByte & "." & sHiByte & " não é suportada por 32-bit Windows Sockets."

  SocketsInitialize = False
Exit Function

End If


SocketsInitialize = True

End Function

Private Sub Command1_Click()

   Text1.Text = GetIPHostName()
   Text2.Text = GetIPAddress()

End Sub