Network Neighborhood List

[Nator]

Is there a way to get a list of all the computers on a network and put them into a list box?

[S@NSIS]

Hi,
Try this:

Open a standard exe and have:
Form called Form1
Listbox called List1
Command button called Command1

Then add a module and paste the following code:

Private Const RESOURCE_CONNECTED As Long = &H1&
Private Const RESOURCE_GLOBALNET As Long = &H2&
Private Const RESOURCE_REMEMBERED As Long = &H3&

Private Const RESOURCEDISPLAYTYPE_DIRECTORY& = &H9
Private Const RESOURCEDISPLAYTYPE_DOMAIN& = &H1
Private Const RESOURCEDISPLAYTYPE_FILE& = &H4
Private Const RESOURCEDISPLAYTYPE_GENERIC& = &H0
Private Const RESOURCEDISPLAYTYPE_GROUP& = &H5
Private Const RESOURCEDISPLAYTYPE_NETWORK& = &H6
Private Const RESOURCEDISPLAYTYPE_ROOT& = &H7
Private Const RESOURCEDISPLAYTYPE_SERVER& = &H2
Private Const RESOURCEDISPLAYTYPE_SHARE& = &H3
Private Const RESOURCEDISPLAYTYPE_SHAREADMIN& = &H8

Private Const RESOURCETYPE_ANY As Long = &H0&
Private Const RESOURCETYPE_DISK As Long = &H1&
Private Const RESOURCETYPE_PRINT As Long = &H2&
Private Const RESOURCETYPE_UNKNOWN As Long = &HFFFF&

Public Const RESOURCEUSAGE_ALL As Long = &H0&
Public Const RESOURCEUSAGE_CONNECTABLE As Long = &H1&
Public Const RESOURCEUSAGE_CONTAINER As Long = &H2&
Public Const RESOURCEUSAGE_RESERVED As Long = &H80000000

Public Const NO_ERROR = 0
Public Const ERROR_MORE_DATA = 234
Public Const RESOURCE_ENUM_ALL As Long = &HFFFF

Public Type NETRESOURCE
dwScope As Long
dwType As Long
dwDisplayType As Long
dwUsage As Long
pLocalName As Long
pRemoteName As Long
pComment As Long
pProvider As Long
End Type

Public Type NETRESOURCE_REAL
dwScope As Long
dwType As Long
dwDisplayType As Long
dwUsage As Long
sLocalName As String
sRemoteName As String
sComment As String
sProvider As String
End Type

Public Declare Function WNetAddConnection2 Lib "mpr.dll" Alias "WNetAddConnection2A" (lpNetResource As NETRESOURCE, ByVal lpPassword As String, ByVal lpUserName As String, ByVal dwFlags As Long) As Long
Public Declare Function WNetOpenEnum Lib "mpr.dll" Alias "WNetOpenEnumA" (ByVal dwScope As Long, ByVal dwType As Long, ByVal dwUsage As Long, lpNetResource As Any, lphEnum As Long) As Long
Public Declare Function WNetEnumResource Lib "mpr.dll" Alias "WNetEnumResourceA" (ByVal hEnum As Long, lpcCount As Long, lpBuffer As NETRESOURCE, lpBufferSize As Long) As Long
Public Declare Function WNetCloseEnum Lib "mpr.dll" (ByVal hEnum As Long) As Long

Public Declare Function VarPtrAny Lib "vb40032.dll" Alias "VarPtr" (lpObject As Any) As Long

Public Declare Sub CopyMem Lib "kernel32" Alias "RtlMoveMemory" (lpTo As Any, lpFrom As Any, ByVal lLen As Long)
Public Declare Sub CopyMemByPtr Lib "kernel32" Alias "RtlMoveMemory" (ByVal lpTo As Long, ByVal lpFrom As Long, ByVal lLen As Long)

Public Declare Function lstrcpy Lib "kernel32" Alias "lstrcpyA" (ByVal lpString1 As String, ByVal lpString2 As Any) As Long
Public Declare Function lstrlen Lib "kernel32" Alias "lstrlenA" (ByVal lpString As Any) As Long



Public Sub GetNetworkDrives()


Const MAX_RESOURCES = 256
Const NOT_A_CONTAINER = -1


Dim bFirstTime As Boolean
Dim lReturn As Long
Dim hEnum As Long
Dim lCount As Long
Dim lMin As Long
Dim lLength As Long
Dim l As Long
Dim lBufferSize As Long
Dim lLastIndex As Long
Dim uNetApi(0 To MAX_RESOURCES) As NETRESOURCE
Dim uNet() As NETRESOURCE_REAL
Dim CurrentDomain
bFirstTime = True 'Make code below aware that that it is the first loop




Do
DoEvents
If bFirstTime Then 'If this is the first time the loop has executed then
'Start the enumeration of all network resources
    lReturn = WNetOpenEnum(RESOURCE_GLOBALNET, RESOURCETYPE_DISK, RESOURCEUSAGE_ALL, ByVal 0&, hEnum) 'Get a handle to a buffer
    'The next time it reaches the if bfirsttime then line it will not be the first time
    bFirstTime = False
Else
    If uNet(lLastIndex).dwUsage And RESOURCEUSAGE_CONTAINER Then
        lReturn = WNetOpenEnum(RESOURCE_GLOBALNET, RESOURCETYPE_DISK, RESOURCEUSAGE_ALL, uNet(lLastIndex), hEnum) 'Initiate the enumeration process
    Else
        lReturn = NOT_A_CONTAINER 'Set the returnvalue to NOT_A_CONTAINER for later reference
        hEnum = 0
    End If
    lLastIndex = lLastIndex + 1 'Increase the network resource number by 1 (array number)
End If

If lReturn = NO_ERROR Then 'If there was no error then procress the data retrieved
    lCount = RESOURCE_ENUM_ALL 'Enumerate all resoureces
    Do
        DoEvents
        lBufferSize = UBound(uNetApi) * Len(uNetApi(0)) / 2 'Set the buffer size
        lReturn = WNetEnumResource(hEnum, lCount, uNetApi(0), lBufferSize) 'Get resource information
        If lCount > 0 Then
            'The next bit copys the information from memory to uNetApi array
            ReDim Preserve uNet(0 To lMin + lCount - 1) As NETRESOURCE_REAL
            For l = 0 To lCount - 1
                uNet(lMin + l).dwScope = uNetApi(l).dwScope
                uNet(lMin + l).dwType = uNetApi(l).dwType
                uNet(lMin + l).dwDisplayType = uNetApi(l).dwDisplayType
                uNet(lMin + l).dwUsage = uNetApi(l).dwUsage
                If uNetApi(l).pLocalName Then
                    lLength = lstrlen(uNetApi(l).pLocalName)
                    uNet(lMin + l).sLocalName = Space$(lLength)
                    CopyMem ByVal uNet(lMin + l).sLocalName, ByVal uNetApi(l).pLocalName, lLength
                End If
                If uNetApi(l).pRemoteName Then
                    lLength = lstrlen(uNetApi(l).pRemoteName)
                    uNet(lMin + l).sRemoteName = Space$(lLength)
                    CopyMem ByVal uNet(lMin + l).sRemoteName, ByVal uNetApi(l).pRemoteName, lLength
                End If
                If uNetApi(l).pComment Then
                    lLength = lstrlen(uNetApi(l).pComment)
                    uNet(lMin + l).sComment = Space$(lLength)
                    CopyMem ByVal uNet(lMin + l).sComment, ByVal uNetApi(l).pComment, lLength
                End If
                If uNetApi(l).pProvider Then
                    lLength = lstrlen(uNetApi(l).pProvider)
                    uNet(lMin + l).sProvider = Space$(lLength)
                    CopyMem ByVal uNet(lMin + l).sProvider, ByVal uNetApi(l).pProvider, lLength
                End If
            Next l
        End If
        lMin = lMin + lCount
    Loop While lReturn = ERROR_MORE_DATA
End If
If hEnum Then l = WNetCloseEnum(hEnum)

Loop While lLastIndex < lMin
    
    
If UBound(uNet) > 0 Then
    For l = 0 To UBound(uNet)
        DoEvents
        'Select what type of resource it is (there are more but these are the only ones that we want
        Select Case uNet(l).dwDisplayType
            Case RESOURCEDISPLAYTYPE_DOMAIN
                CurrentDomain = uNet(l).sRemoteName
            Case RESOURCEDISPLAYTYPE_SERVER

                If CurrentDomain <> "" Then
                    Form1.List1.AddItem Mid$(uNet(l).sRemoteName, 3, Len(uNet(l).sRemoteName) - 2)
                Else
                    Form1.List1.AddItem Mid$(uNet(l).sRemoteName, 3, Len(uNet(l).sRemoteName) - 2)
                End If
        End Select
    Next l
End If

End Sub

then in the forms module put this:

Private Sub Command1_Click()
    GetNetworkDrives
End Sub

and your listbox will fill up with all available network drives.

Hope this helps

Shaun

[cas21]

' This will get network name and computer names

'Paste this into a module

Option Explicit

Public Type NETRESOURCE
dwScope As Long
dwType As Long
dwDisplayType As Long
dwUsage As Long
lpLocalName As Long
lpRemoteName As Long
lpComment As Long
lpProvider As Long
End Type

Public Declare Function WNetOpenEnum Lib "mpr.dll" Alias _
"WNetOpenEnumA" ( _
ByVal dwScope As Long, _
ByVal dwType As Long, _
ByVal dwUsage As Long, _
lpNetResource As Any, _
lphEnum As Long) As Long

Public Declare Function WNetEnumResource Lib "mpr.dll" Alias _
"WNetEnumResourceA" ( _
ByVal hEnum As Long, _
lpcCount As Long, _
ByVal lpBuffer As Long, _
lpBufferSize As Long) As Long

Public Declare Function WNetCloseEnum Lib "mpr.dll" ( _
ByVal hEnum As Long) As Long

'RESOURCE ENUMERATION.
Public Const RESOURCE_CONNECTED = &H1
Public Const RESOURCE_GLOBALNET = &H2
Public Const RESOURCE_REMEMBERED = &H3

Public Const RESOURCETYPE_ANY = &H0
Public Const RESOURCETYPE_DISK = &H1
Public Const RESOURCETYPE_PRINT = &H2
Public Const RESOURCETYPE_UNKNOWN = &HFFFF

Public Const RESOURCEUSAGE_CONNECTABLE = &H1
Public Const RESOURCEUSAGE_CONTAINER = &H2
Public Const RESOURCEUSAGE_RESERVED = &H80000000

Private Const GMEM_FIXED = &H0
Private Const GMEM_ZEROINIT = &H40
Private Const GPTR = (GMEM_FIXED Or GMEM_ZEROINIT)

Private Declare Function GlobalAlloc Lib "KERNEL32" (ByVal wFlags As Long, ByVal dwBytes As Long) As Long
Private Declare Function GlobalFree Lib "KERNEL32" (ByVal hMem As Long) As Long
Private Declare Sub CopyMemory Lib "KERNEL32" Alias "RtlMoveMemory" (hpvDest As Any, hpvSource As Any, ByVal cbCopy As Long)
Private Declare Function CopyPointer2String Lib "KERNEL32" Alias "lstrcpyA" (ByVal NewString As String, ByVal OldString As Long) As Long

Public Sub DoNetEnum()
Dim hEnum As Long, lpBuff As Long, NR As NETRESOURCE
Dim cbBuff As Long, cCount As Long
Dim p As Long, res As Long, i As Long

'Setup the NETRESOURCE input structure.
NR.lpRemoteName = 0
cbBuff = 10000
cCount = &HFFFFFFFF


'Open a Net enumeration operation handle: hEnum.
res = WNetOpenEnum(RESOURCE_GLOBALNET, RESOURCETYPE_ANY, 0, NR, hEnum)

If res = 0 Then
'Create a buffer large enough for the results.
'10000 bytes should be sufficient.
lpBuff = GlobalAlloc(GPTR, cbBuff)
'Call the enumeration function.
res = WNetEnumResource(hEnum, cCount, lpBuff, cbBuff)
If res = 0 Then
p = lpBuff
'WNetEnumResource fills the buffer with an array of
'NETRESOURCE structures. Walk through the list and print
'each local and remote name.
For i = 1 To cCount
' All we get back are the Global Network Containers --- Enumerate each of these
CopyMemory NR, ByVal p, LenB(NR)
Form1.Show
Form1.List1.AddItem "Network Name " & PointerToString(NR.lpRemoteName)

DoNetEnum2 NR
p = p + LenB(NR)
Next i
End If
If lpBuff <> 0 Then GlobalFree (lpBuff)
WNetCloseEnum (hEnum) 'Close the enumeration
End If
End Sub

Private Function PointerToString(p As Long) As String
'The values returned in the NETRESOURCE structures are pointers to
'ANSI strings so they need to be converted to Visual Basic Strings.
Dim s As String
s = String(255, Chr$(0))
CopyPointer2String s, p
PointerToString = Left(s, InStr(s, Chr$(0)) - 1)
End Function

Public Sub DoNetEnum2(NR As NETRESOURCE)
Dim hEnum As Long, lpBuff As Long
Dim cbBuff As Long, cCount As Long
Dim p As Long, res As Long, i As Long

'Setup the NETRESOURCE input structure.
cbBuff = 10000
cCount = &HFFFFFFFF

'Open a Net enumeration operation handle: hEnum.

res = WNetOpenEnum(RESOURCE_GLOBALNET, RESOURCETYPE_ANY, 0, NR, hEnum)

If res = 0 Then
'Create a buffer large enough for the results.
'10000 bytes should be sufficient.
lpBuff = GlobalAlloc(GPTR, cbBuff)
'Call the enumeration function.
res = WNetEnumResource(hEnum, cCount, lpBuff, cbBuff)
If res = 0 Then
p = lpBuff
'WNetEnumResource fills the buffer with an array of
'NETRESOURCE structures. Walk through the list and print
'each remote name.
For i = 1 To cCount
CopyMemory NR, ByVal p, LenB(NR)
Form1.List1.AddItem "Network Computer #" & i & " " & PointerToString(NR.lpRemoteName)
p = p + LenB(NR)
Next i
End If
If lpBuff <> 0 Then GlobalFree (lpBuff)
WNetCloseEnum (hEnum) 'Close the enumeration
Else
End If
End Sub


'This is for form1 which has a list1

Private Sub Form_Load()
DoNetEnum

End Sub

[Nator]

Thanks. Those worked great. I appreciates the help.