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FAQ / Программирование / Visual Basic

Как определить HOST и IP-адрес компьютера?

Вопрос:

    Как в программе на VB определить имя и IP-адрес компьютера?
    

Ответ:

    Подготовте проект, добавив в него форму.
    На форму поместите:
    - Кнопку с именем cmdGetHost
    - 2 текстовых поля с именами txtHostName и txtIpAddr
    Добавте в форму:
    Option Explicit
    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 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 MIN_SOCKETS_REQD As Long = 1
    Private Const SOCKET_ERROR As Long = -1
    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 WSAGetLastError Lib "WSOCK32.DLL" () As Long
    Private Declare Function WSAStartup Lib "WSOCK32.DLL" (ByVal wVersionRequired As Long, lpWSADATA As WSADATA) As Long
    Private Declare Function WSACleanup Lib "WSOCK32.DLL" () As Long
    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 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 "Windows Sockets error " & Str$(WSAGetLastError()) & " has occurred. Unable to successfully get Host Name."
    SocketsCleanup
    Exit Function
    End If
    sHostName = Trim$(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
    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()) & " has occurred. Unable to successfully get Host Name."
    SocketsCleanup
    Exit Function
    End If
    GetIPHostName = Left$(sHostName, InStr(sHostName, Chr(0)) - 1)
    SocketsCleanup
    End Function
    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 Sub SocketsCleanup()
    If WSACleanup() <> ERROR_SUCCESS Then
    MsgBox "Socket error occurred in Cleanup."
    End If
    End Sub
    Private 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 "The 32-bit Windows Socket is not responding."
    SocketsInitialize = False
    Exit Function
    End If
    If WSAD.wMaxSockets < MIN_SOCKETS_REQD Then
    MsgBox "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))
    MsgBox "Sockets version " & sLoByte & "." & sHiByte & " is not supported by 32-bit Windows Sockets."
    SocketsInitialize = False
    Exit Function
    End If
    SocketsInitialize = True
    End Function
    ' Использование
    Private Sub cmdGetHost_Click()
    txtHostName = GetIPHostName()
    txtIpAddr = GetIPAddress()
    End Sub
    Мир программирования на Visual BASIC 5.0 и HTML
    

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