Sample Code to Return the UNC Path of a Network Drive

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This article describes how to use a Microsoft Visual Basic for Applications sub-procedure (or macro) and a Windows application programming interface (API) call to return the universal naming convention (UNC) path for a mapped network drive.

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A UNC is a naming convention that permits you to use a network resource, such as a network server, without formally connecting to the network resource with a mapped drive. A UNC path uses the following syntax:
where <Server> is the name of the network server and <share> is a folder on the server.

A mapped drive uses a drive letter (for example, drive F:), where the letter represents the server and the share to which it is mapped.

The following code samples use a Windows API call to locate the mapped drive and then return its UNC path.

Microsoft Office 97 and Microsoft Office 7.0

   ' 32-bit Function version.
' Enter this declaration on a single line.
Declare Function WNetGetConnection32 Lib "MPR.DLL" Alias _
"WNetGetConnectionA" (ByVal lpszLocalName As String, ByVal _
lpszRemoteName As String, lSize As Long) As Long

' 32-bit declarations:
Dim lpszRemoteName As String
Dim lSize As Long

' Use for the return value of WNetGetConnection() API.
Const NO_ERROR As Long = 0

' The size used for the string buffer. Adjust this if you
' need a larger buffer.
Const lBUFFER_SIZE As Long = 255

Sub GetNetPath()

' Prompt the user to type the mapped drive letter.
DriveLetter = UCase(InputBox("Enter Drive Letter of Your Network" & _
"Connection." & Chr(10) & "i.e. F (do not enter a colon)"))

' Add a colon to the drive letter entered.
DriveLetter = DriveLetter & ":"

' Specifies the size in characters of the buffer.
cbRemoteName = lBUFFER_SIZE

' Prepare a string variable by padding spaces.
lpszRemoteName = lpszRemoteName & Space(lBUFFER_SIZE)

' Return the UNC path (\\Server\Share).
lStatus& = WNetGetConnection32(DriveLetter, lpszRemoteName, _

' Verify that the WNetGetConnection() succeeded. WNetGetConnection()
' returns 0 (NO_ERROR) if it successfully retrieves the UNC path.
If lStatus& = NO_ERROR Then

' Display the UNC path.
MsgBox lpszRemoteName, vbInformation

' Unable to obtain the UNC path.
MsgBox "Unable to obtain the UNC path.", vbInformation
End If

End Sub

Microsoft Excel 5.0

   ' 16-bit Function for Excel 5.0.
' Enter this declaration on a single line.
Declare Function WNetGetConnection Lib "user" (ByVal lpszLocalName _
As String, ByVal lpszRemoteName As String, cbRemoteName As _
Integer) As Integer

' 16-bit declarations:
Dim NetName As String
Dim x As Integer
Dim DriveLetter As String

Sub GetNetPath()

' Prompt the user to type the mapped drive letter.
DriveLetter = UCase(InputBox("Enter Drive Letter of Your Network" & _
"Connection." & Chr(10) & "i.e. F (do not enter a colon)"))

DriveLetter = DriveLetter & ":"

' 16-bit call for Excel 5.0.
' Pad NetName with spaces.
NetName = NetName & Space(80)

' API call returns one of eight values. If it returns zero, it is
' successful.
x = WNetGetConnection(DriveLetter, NetName, 80)

' Display the UNC path.
MsgBox NetName

End Sub


For additional information about getting help with Visual Basic forApplications, click the article number below to view the article in the Microsoft Knowledge Base:

163435 VBA: Programming Resources for Visual Basic for Applications

Id. de artículo: 160529 - Última revisión: 07/13/2009 - Revisión: 1