Map Network drive

How can I map a network drive then check that it is still mapped when the program starts

To map a network drive, take a look at this thread.

Or you can do it using DOS.

Code:

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Private Sub Command1_Click()
Shell ("net use ?: \\??\c"), vbHide
End Sub

?  = The drive letter you want to use
?? = the network name of the computer you are mapping

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Assuming you're network drive is mapped with an NT share, and the program you're talking about, is a vb program, you can use this code to make sure the connection is OK.

Code:

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Option Explicit
Private Type NETRESOURCE
    dwScope As Long
    dwType As Long
    dwDisplayType As Long
    dwUsage As Long
    pLocalName As String
    pRemoteName As String
    pComment As Long
    pProvider As Long
End Type

Private Declare Function WNetGetConnection Lib "mpr.dll" Alias "WNetGetConnectionA" (ByVal lpszLocalName As String, ByVal lpszRemoteName As String, cbRemoteName As Long) As Long
Private Declare Function WNetCancelConnection2 Lib "mpr.dll" Alias "WNetCancelConnection2A" (ByVal lpName As String, ByVal dwFlags As Long, ByVal fForce As Long) As Long
Private 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
Private Const RESOURCETYPE_DISK = &H1
Private Const ERROR_NOT_CONNECTED = 2250&
Private Const CONNECT_UPDATE_PROFILE = &H1

Private Sub Form_Load()
    Call CheckDrive("J:", "\\vseuec01\iss_dev$")
End Sub

Private Sub CheckDrive(ByVal Drive As String, ByVal Share As String)
Dim CurrShare As String
Dim nr As NETRESOURCE
Dim retVal As Long
Dim bConnected As Boolean
    bConnected = False
    CurrShare = Space(256)
    retVal = WNetGetConnection(Drive, CurrShare, 255)
    If retVal = 0 Then
        CurrShare = Left(CurrShare, InStr(CurrShare, Chr(0)) - 1)
        If UCase(Share) = UCase(CurrShare) Then
            ' everything is OK, do nothing
            bConnected = True
        Else
            ' if already connected to something else
            ' disconnect it (and force it)
            retVal = WNetCancelConnection2(Drive, 0, True)
        End If
    End If
    ' if not connected, connect it
    If Not bConnected Then
        nr.dwType = RESOURCETYPE_DISK
        nr.pLocalName = Drive
        nr.pRemoteName = Share
        retVal = WNetAddConnection2(nr, vbNullString, vbNullString, 0)
        ' if you want the new connection to be restored at next logon
        ' use the next line instead of the previous one
        'retVal = WNetAddConnection2(nr, vbNullString, vbNullString, CONNECT_UPDATE_PROFILE)
    End If
End Sub

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