9.6 Networking with Scripts

VBScript has a few limited networking functions built in that can be used for mapping network drives and connecting to network printers. For advanced network functionality (such as communication and network traffic monitoring), you'll have to look into a different scripting language. For more information on networking, see Chapter 7.

The following routines provide access to some of the more useful network-related functions in VBScript.

The following function checks a given drive letter to see if it has already been mapped. It returns True (-1) if the drive letter has been mapped, False (0) if it hasn't:

Function AlreadyMapped(DriveLetter)   Set WshShell = WScript.CreateObject("WScript.Shell")   Set WshNetwork = WScript.CreateObject("WScript.Network")   Set AllDrives = WshNetwork.EnumNetworkDrives(  )   If Left(DriveLetter,1) <> ":" then DriveLetter = DriveLetter & ":"   ConnectedFlag = False   For i = 0 To AllDrives.Count - 1 Step 2     If AllDrives.Item(i) = UCase(DriveLetter) Then ConnectedFlag = True   Next   AlreadyMapped = ConnectedFlag End Function

This subroutine maps a drive letter to any valid remote path:

Sub MapNetDrive(DriveLetter, RemotePath)   Set WshShell = WScript.CreateObject("WScript.Shell")   Set WshNetwork = WScript.CreateObject("WScript.Network")   WShNetwork.MapNetworkDrive DriveLetter, RemotePath End Sub

This subroutine maps an unused printer port (e.g., LPT3) to any valid remote network printer:

Sub MapNetPrinter(Port, RemotePath)   Set WshShell = WScript.CreateObject("WScript.Shell")   Set WshNetwork = WScript.CreateObject("WScript.Network")   WshNetwork.AddPrinterConnection Port, RemotePath End Sub

This subroutine removes the mapping for a previously mapped drive letter:

Sub UnMapNetDrive(DriveLetter)   Set WshShell = WScript.CreateObject("WScript.Shell")   Set WshNetwork = WScript.CreateObject("WScript.Network")   WShNetwork.RemoveNetworkDrive DriveLetter End Sub

This subroutine removes the mapping for a previously mapped network printer:

Sub UnMapNetPrinter(Port)   Set WshShell = WScript.CreateObject("WScript.Shell")   Set WshNetwork = WScript.CreateObject("WScript.Network")   WshNetwork.RemovePrinterConnection Port End Sub

The following script serves as an example for these subroutines. It's used to map a network drive if it's not already mapped or to disconnect a currently mapped drive. The previous routines are required.

DriveLetter = "N:" RemotePath = "\\server\c" If AlreadyMapped(DriveLetter) then   Call UnMapNetDrive(DriveLetter)   Msgbox "Drive " & DriveLetter & " disconnected." Else   Call MapNetDrive(DriveLetter, RemotePath)   Msgbox "Drive " & DriveLetter & " connected." End if

This script requires no user interaction once it has been executed and displays only a single confirmation message when it's done. The first two lines contain the drive letter and network path to be mapped together. Then, the AlreadyMapped function is used to determine if the drive mapping already exists. The script then maps or disconnects the drive, depending on what's needed.