Mi e’ capitato, durante la realizzazione di un software ‘di servizio’, di dover far ‘mappare’ un unita’ di rete al software e fargli copiare un file sulla suddetta unita’ .

Non volendo optare per uno ‘sporco’ shell “net use… ho fatto qualche ricerca tra le API di windows:

**> **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*****

Questa funzione permette di connettere un’unita’ di rete

**> **Public Declare Function WNetCancelConnection2 Lib “mpr.dll” Alias

“WNetCancelConnection2A” (ByVal lpName As String, ByVal dwFlags As Long, ByVal fForce As Long) As Long*****

Questa invece viene utilizzata per disconnettere l’unita’ .

A questo punto il passo e’ breve:

Creo un nuovo modulo, dichiaro qualche costante, le API e due funzioni per sfruttarle:

**> **Option Explicit

Const CONNECT_UPDATE_PROFILE = &H1

Const RESOURCE_CONNECTED As Long = &H1& Const RESOURCE_GLOBALNET As Long = &H2& Const RESOURCETYPE_DISK As Long = &H1& Const RESOURCEDISPLAYTYPE_SHARE& = &H3 Const RESOURCEUSAGE_CONNECTABLE As Long = &H1&

Declare Function WNetAddConnection2 Lib “mpr.dll” _ Alias “WNetAddConnection2A” (lpNetResource As NETCONNECT, _ ByVal lpPassword As String, ByVal lpUserName As String, _ ByVal dwFlags As Long) As Long

Declare Function WNetCancelConnection2 Lib “mpr.dll” _ Alias “WNetCancelConnection2A” (ByVal lpName As String, _ ByVal dwFlags As Long, _ ByVal fForce As Long) As Long

Type NETCONNECT dwScope As Long dwType As Long dwDisplayType As Long dwUsage As Long lpLocalName As String lpRemoteName As String lpComment As String lpProvider As String End Type Public Function DisconnectDrive(LocalDrive As String) As Boolean

Dim NetR As NETCONNECT

‘Utilizzo: ‘DisconnectDrive “Q:”

DisconnectDrive = (WNetCancelConnection2(LocalDrive, 0, 1)) End Function

Function MapDrive(LocalDrive As String, _ RemoteDrive As String, Optional Username As String, _ Optional Password As String) As Boolean

‘Utilizzo: ‘MapDrive “Q:”, “RemoteMachineRemoteDirectory”,”MyLoginName”, “MyPassword”

Dim NetR As NETCONNECT

NetR.dwScope = RESOURCE_GLOBALNET NetR.dwType = RESOURCETYPE_DISK NetR.dwDisplayType = RESOURCEDISPLAYTYPE_SHARE NetR.dwUsage = RESOURCEUSAGE_CONNECTABLE NetR.lpLocalName = Left$(LocalDrive, 1) & “:” NetR.lpRemoteName = RemoteDrive MapDrive = (WNetAddConnection2(NetR, Username, Password, _ CONNECT_UPDATE_PROFILE) = 0)

End Function*****

A questo punto, la copia del file risulta semplice, utilizzando il comando

FileCopy [origine], [destinazione]