------知道某计算机的IP,得到它的计算机名----------
Private Const WSADescription_Len = 256
Private Const WSASYS_Status_Len = 128
Private Const WS_VERSION_REQD As Long = &H101
Private Const IP_SUCCESS As Long = 0
Private Const SOCKET_ERROR As Long = -1
Private Const AF_INET = 2
Private 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
imaxudp As Integer
lpszvenderinfo As Long
End Type
Private Declare Function WSAStartup Lib "wsock32.dll" _
(ByVal VersionReq As Long, _
WSADataReturn As WSADATA) As Long
Private Declare Function WSACleanup Lib "wsock32.dll" () As Long
Private Declare Function inet_addr Lib "wsock32.dll" _
(ByVal s As String) As Long
Private Declare Function gethostbyaddr Lib "wsock32.dll" _
(haddr As Long, _
ByVal hnlen As Long, _
ByVal addrtype As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" _
Alias "RtlMoveMemory" _
(xDest As Any, _
xSource As Any, _
ByVal nbytes As Long)
Private Declare Function lstrlen Lib "kernel32" _
Alias "lstrlenA" _
(lpString As Any) As Long
If WSACleanup() <> 0 Then
MsgBox "Windows Sockets error occurred in Cleanup.", vbExclamation
End If
End Sub
Public Function GetHostNameFromIP(ByVal sAddress As String) As String
Dim ptrHosent As Long
Dim hAddress As Long
Dim nbytes As Long
If SocketsInitialize() Then
'convert string address to long
hAddress = inet_addr(sAddress)
If hAddress <> SOCKET_ERROR Then
'obtain a pointer to the HOSTENT structure
'that contains the name and address
'corresponding to the given network address.
ptrHosent = gethostbyaddr(hAddress, 4, AF_INET)