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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

Можно это сделать и не вылезая за рамки стандартного VB.
Для этого надо поместить на форму Winsock-control и когда необходимо прочесть имя DNS или IP компа, то необходимо прочитать поля LocalHostName и LocalIP этого компа.

ЗЫ: Я понимаю, что это не самое лучшее применение Winsock-контрола, но на мой взгляд оно проще, нежели приведенный выше метод.

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