VB Tips:Connettere unita' di rete



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:

[sourcecode language="vb"]
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
[/sourcecode]

Questa funzione permette di connettere un'unita' di rete

[sourcecode language="vb"]
Public Declare Function WNetCancelConnection2 Lib "mpr.dll" Alias
"WNetCancelConnection2A" (ByVal lpName As String, ByVal dwFlags As Long, ByVal
fForce As Long) As Long
[/sourcecode]

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:

[sourcecode language="vb"]
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
[/sourcecode]

A questo punto, la copia del file risulta semplice, utilizzando il comando
FileCopy [origine], [destinazione]

Published: December 01 2005

  • category: