I found the cure in a 'pure' 64-bit world.
The VM I have set up (in VMWare's Player) uses 64-bit Windows 7 Ultimate and
the 64-bit Beta version of Office/Excel.
To get the code to run in that environment you have to change all of the
Private Declare
statements to
Private Declare PtrSafe
and then it compiles and runs just fine in the 64-bit world (but not in
32-bit Excel 2007, which doesn't seem to recognize "PtrSafe" at all).


"JLatham" wrote:

Joel,
Nice find. I looked for something like that and was not successful. Do you
have the URL for the site?

I've modified it to work off of an Excel sheet vs through a form and tested
with the 32-bit version of Office/Excel under both Vista Home Premium x64 and
Windows 7 Ultimate x64 and it works fine. However, in a virtual machine
running Windows 7 Pro x64 with the Office/Excel 2010 Beta, the code won't
compile and markes all API declarations as errors with this message:

Compiler error:
The code in this project must be updated for use on 64-bit systems.
Please review and update Declare statements and then mark them with
the PtrSafe attribute.

Guess I'll have to dig into the x64 API's and see if I can't figure out how
to change that section, plus I'll have to research the "PtrSafe" attribute,
which the Help in 2010 VBA gave no reference to and couldn't find it on
on-line help either.

"joel" wrote:


I found code on the web that works fine. I added a routing at the end
to test the code.


'''''''''''''''''''''''''''''''''''''''''''''''''' ''''''''''''''
' Copyright ©1996-2009 VBnet, Randy Birch, All Rights Reserved.
' Some pages may also contain other copyrights by the author.
'''''''''''''''''''''''''''''''''''''''''''''''''' ''''''''''''''
' Distribution: You can freely use this code in your own
' applications, but you may not reproduce
' or publish this code on any web site,
' online service, or distribute as source
' on any media without express permission.
'''''''''''''''''''''''''''''''''''''''''''''''''' ''''''''''''''
Private Const WSADescription_Len As Long = 256
Private Const WSASYS_Status_Len As Long = 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 As Long = 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" _
(ByVal VersionReq As Long, _
WSADataReturn As WSADATA) As Long

Private Declare Function WSACleanup Lib "wsock32" () As Long

Private Declare Function inet_addr Lib "wsock32" _
(ByVal s As String) As Long

Private Declare Function gethostbyaddr Lib "wsock32" _
(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



Private Sub Command1_Click()

Text2.Text = GetHostNameFromIP(Text1.Text)

End Sub


Private Function SocketsInitialize() As Boolean

Dim WSAD As WSADATA

SocketsInitialize = WSAStartup(WS_VERSION_REQD, WSAD) = IP_SUCCESS

End Function


Private Sub SocketsCleanup()

If WSACleanup() < 0 Then
MsgBox "Windows Sockets error occurred in Cleanup.",
vbExclamation
End If

End Sub


Private 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)

If ptrHosent < 0 Then

'convert address and
'get resolved hostname
CopyMemory ptrHosent, ByVal ptrHosent, 4
nbytes = lstrlen(ByVal ptrHosent)

If nbytes 0 Then
sAddress = Space$(nbytes)
CopyMemory ByVal sAddress, ByVal ptrHosent, nbytes
GetHostNameFromIP = sAddress
End If

Else
MsgBox "Call to gethostbyaddr failed."
End If 'If ptrHosent

SocketsCleanup

Else
MsgBox "String passed is an invalid IP."
End If 'If hAddress

Else
MsgBox "Sockets failed to initialize."
End If 'If SocketsInitialize

End Function

Sub test()
MsgBox (GetHostNameFromIP("192.168.1.30"))

End Sub


--
joel
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.

I did a google search so I wasn't suprized that you easily found the
same site. I would think the fix in excel is to change the declarations
of Long to Double. Long would be 32 bits and double would be 64 bits.
Excel 2007 is still in a 32 bit world and the DLL in windows 7 are 64
bit.


--
joel
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