Accesar a una carpeta compartida

Ricardo
01 de Octubre del 2003
Hola, quisiera que alguien me pudiera ayudar, esta es mi duda. Necesito accesar una carpeta compartida que se encuentra en otra computadora (dirección IP fija). Entonces, necesito saber como accesar a la otra computadora, para acceder a esa carpeta, no sé si alguien me pudiera ayudar. Gracias.

sdemingo
01 de Octubre del 2003
Mírate este código a ver si te ayuda algo.

'This example was submitted by Lee Carpenter
'
'It needs a class module and a form, with a label (m_lblStatus) on the form

'In the class module (CprgNetShareGetInfo)

Option Explicit

'local variable(s) to hold property value(s)
Private mvarstrServer As Variant 'local copy
Private mvarstrNetName As Variant 'local copy
Private mvarnType As Long 'local copy
Private mvarstrRemark As Variant 'local copy
Private mvarnCurrent_uses As Long 'local copy
Private mvarnMax_uses As Long 'local copy
Private mvarstrPath As Variant 'local copy
Private mvarnLastError As Long 'local copy
Private mvarstrLastError As Variant 'local copy
Private mvarNET_API_STATUS As Long 'local copy

'local variable(s) to hold internal value(s)

' Private constants, types and declares to call
'

Const STYPE_DISKTREE As Long = 0
Const STYPE_PRINTQ As Long = 1
Const STYPE_DEVICE As Long = 2
Const STYPE_IPC As Long = 3
Const STYPE_SPECIAL As Long = &H80000000

Const ERROR_SUCCESS As Long = 0&
Const NERR_Success As Long = 0&
Const ERROR_ACCESS_DENIED As Long = 5&
Const ERROR_INVALID_LEVEL As Long = 124&
Const ERROR_INVALID_PARAMETER As Long = 87&
Const ERROR_MORE_DATA As Long = 234&
Const ERROR_NOT_ENOUGH_MEMORY As Long = 8&
Const ERROR_INVALID_NAME As Long = 123&

Const NERR_BASE As Long = 2100&
Const NERR_NetNameNotFound As Long = (NERR_BASE + 210)


Private Type SHARE_INFO_502
shi502_netname As Long ' LPWSTR shi502_netname;
shi502_type As Long ' DWORD shi502_type;
shi502_remark As Long ' LPWSTR shi502_remark;
shi502_permissions As Long ' DWORD shi502_permissions;
shi502_max_uses As Long ' DWORD shi502_max_uses;
shi502_current_uses As Long ' DWORD shi502_current_uses;
shi502_path As Long ' LPWSTR shi502_path;
shi502_passwd As Long ' LPWSTR shi502_passwd;
shi502_reserved As Long ' DWORD shi502_reserved;
shi502_security_descriptor As Long ' PSECURITY_DESCRIPTOR shi502_security_descriptor;
End Type

'NET_API_STATUS NET_API_FUNCTION
'NetShareGetInfo (
' IN LPTSTR servername,
' IN LPTSTR netname,
' IN DWORD level,
' OUT LPBYTE * bufptr
' );
Private Declare Function NetShareGetInfo Lib "Netapi32.dll" _
( _
strServerName As Any, _
strNetName As Any, _
ByVal nLevel As Long, _
pBuffer As Long _
) As Long

Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" _
( _
Destination As Any, _
ByVal Source As Any, _
ByVal Length As Long _
)

Private Declare Function NetApiBufferFree Lib "Netapi32.dll" _
( _
ByVal lpBuffer As Long _
) As Long

Private Declare Sub lstrcpyW Lib "kernel32" _
( _
dest As Any, _
ByVal src As Any _
)

Private Declare Function lstrlenW Lib "kernel32" _
( _
ByVal lpszString As Any _
) As Long

Public Property Get NET_API_STATUS() As Long
'used when retrieving value of a property, on the right side of an assignment.
'Syntax: Debug.Print X.NET_API_STATUS
NET_API_STATUS = mvarNET_API_STATUS
End Property

Public Property Get strLastError() As Variant
'used when retrieving value of a property, on the right side of an assignment.
'Syntax: Debug.Print X.strLastError
If IsObject(mvarstrLastError) Then
Set strLastError = mvarstrLastError
Else
strLastError = mvarstrLastError
End If
End Property

Public Property Get nLastError() As Long
'used when retrieving value of a property, on the right side of an assignment.
'Syntax: Debug.Print X.nLastError
nLastError = mvarnLastError
End Property

Public Property Get strPath() As Variant
'used when retrieving value of a property, on the right side of an assignment.
'Syntax: Debug.Print X.strPath
If IsObject(mvarstrPath) Then
Set strPath = mvarstrPath
Else
strPath = mvarstrPath
End If
End Property

Public Property Get nMax_uses() As Long
'used when retrieving value of a property, on the right side of an assignment.
'Syntax: Debug.Print X.nMax_uses
nMax_uses = mvarnMax_uses
End Property

Public Property Get nCurrent_uses() As Long
'used when retrieving value of a property, on the right side of an assignment.
'Syntax: Debug.Print X.nCurrent_uses
nCurrent_uses = mvarnCurrent_uses
End Property

Public Property Get strRemark() As Variant
'used when retrieving value of a property, on the right side of an assignment.
'Syntax: Debug.Print X.strRemark
If IsObject(mvarstrRemark) Then
Set strRemark = mvarstrRemark
Else
strRemark = mvarstrRemark
End If
End Property

Public Property Get nType() As Long
'used when retrieving value of a property, on the right side of an assignment.
'Syntax: Debug.Print X.nType
nType = mvarnType
End Property

Public Property Get strType() As Variant
'used when retrieving value of a property, on the right side of an assignment.
'Syntax: Debug.Print X.strType
Select Case mvarnType
Case STYPE_DISKTREE
strType = "Disk Drive"
Case STYPE_PRINTQ
strType = "Print Queue"
Case STYPE_DEVICE
strType = "Communication device"
Case STYPE_IPC
strType = "Interprocess communication (IPC)"
Case STYPE_SPECIAL
strType = "Special share"
Case Else
strType = "Error: Unknown"
End Select
End Property

Public Property Get strNetName() As Variant
'used when retrieving value of a property, on the right side of an assignment.
'Syntax: Debug.Print X.strNetName
If IsObject(mvarstrNetName) Then
Set strNetName = mvarstrNetName
Else
strNetName = mvarstrNetName
End If
End Property

Public Property Get strServer() As Variant
'used when retrieving value of a property, on the right side of an assignment.
'Syntax: Debug.Print X.strServer
If IsObject(mvarstrServer) Then
Set strServer = mvarstrServer
Else
strServer = mvarstrServer
End If
End Property
Public Sub Initialize()

' Reset the everything
'
mvarnLastError = 0
mvarstrLastError = ""
mvarstrServer = ""
mvarstrNetName = ""
mvarnType = 0
mvarstrRemark = ""
mvarnCurrent_uses = 0
mvarnMax_uses = 0
mvarstrPath = ""

End Sub
Public Sub GetInfo(strShareName As Variant)
Dim pNetName() As Byte
Dim pServer() As Byte
Dim ptmpBuffer As Long
Dim tmpBuffer As SHARE_INFO_502
Dim strNetName As String
Dim x As Integer

Call Initialize

' copy the network share name without leading spaces.
'
strNetName = LTrim(strShareName)

' check for leading server in the name.
'
If Left(strNetName, 2) = "\" Then

' find the end of the server in the name
'
x = InStr(3, strNetName, "")

' only a server in the name
'
If x = 0 Then
mvarnLastError = ERROR_INVALID_NAME
mvarstrLastError = "Need share name not server name."
Exit Sub
Else
mvarstrServer = Left(strNetName, x - 1)
strNetName = Mid(strNetName, x + 1)
End If
End If

' strip off any remaining leading
'
If Left(strNetName, 1) = "" Then
strNetName = Mid(strNetName, 2)
End If

' Find the end of the share name.
'
x = InStr(strNetName, "")
If x > 0 Then
strNetName = Left(strNetName, x - 1)
End If

' Check for drive letter
'
x = InStr(strNetName, ":")
If x > 0 Then
mvarnLastError = ERROR_INVALID_NAME
mvarstrLastError = "Drive letter specified for share name."
Exit Sub
End If

' Convert the string to a UNI string, happens automatically.
'
pNetName = strNetName & vbNullChar

If Len(mvarstrServer) > 0 Then

' format the server name
'
If Left(mvarstrServer, 2) = "\" Then
pServer = mvarstrServer & vbNullChar
Else
pServer = "\" & mvarstrServer & vbNullChar
End If
' Get the network infomation on the share.
'
mvarNET_API_STATUS = NetShareGetInfo _
( _
pServer(0), _
pNetName(0), _
502, _
ptmpBuffer _
)
Else
' Get the network infomation on the share.
' NOTE: the first parameter is the server name, by sending a
' null you are only looking at the current machine.
'
mvarNET_API_STATUS = NetShareGetInfo _
( _
vbEmpty, _
pNetName(0), _
502, _
ptmpBuffer _
)
End If

' Check for errors.
'
If mvarNET_API_STATUS <> NERR_Success Then
Select Case mvarNET_API_STATUS
Case ERROR_ACCESS_DENIED
mvarstrLastError = "NetShareGetInfo: ERROR_ACCESS_DENIED"
Case ERROR_INVALID_LEVEL
mvarstrLastError = "NetShareGetInfo: ERROR_INVALID_LEVEL"
Case ERROR_INVALID_PARAMETER
mvarstrLastError = "NetShareGetInfo: ERROR_INVALID_PARAMETER"
Case ERROR_MORE_DATA
mvarstrLastError = "NetShareGetInfo: ERROR_MORE_DATA"
Case ERROR_NOT_ENOUGH_MEMORY
mvarstrLastError = "NetShareGetInfo: ERROR_NOT_ENOUGH_MEMORY"
Case ERROR_INVALID_NAME
mvarstrLastError = "NetShareGetInfo: ERROR_INVALID_NAME"
Case NERR_NetNameNotFound
mvarstrLastError = "NetShareGetInfo: NERR_NetNameNotFound"
Case Else
mvarstrLastError = "NetShareGetInfo: Unknown " & mvarNET_API_STATUS
End Select
mvarnLastError = mvarNET_API_STATUS
Exit Sub
End If

' Copy the return buffer to a type definition for processing.
'
Call CopyMemory(tmpBuffer, ptmpBuffer, LenB(tmpBuffer))

' save the return buffer information.
'
mvarstrNetName = UtoA(tmpBuffer.shi502_netname)
mvarnType = tmpBuffer.shi502_type
mvarstrRemark = UtoA(tmpBuffer.shi502_remark)
mvarnCurrent_uses = tmpBuffer.shi502_current_uses
mvarnMax_uses = tmpBuffer.shi502_max_uses
mvarstrPath = UtoA(tmpBuffer.shi502_path)

' Free the buffer.
'
mvarNET_API_STATUS = NetApiBufferFree(ptmpBuffer)

' Check for errors.
'
If mvarNET_API_STATUS <> ERROR_SUCCESS Then
mvarnLastError = mvarNET_API_STATUS
mvarstrLastError = "NetApiBufferFree: Unknown"
Exit Sub
End If
End Sub
Private Function UtoA(pUNIstring As Long) As String
Dim wrkByte() As Byte
Dim wrkStr As String

' Get space for string each character is two bytes
' and a null terminator.
'
ReDim wrkByte(lstrlenW(pUNIstring) * 2 + 2)

' Copy the string to a byte array
'
Call lstrcpyW(wrkByte(0), pUNIstring)

' Covert the string from a UNI string to a ASCII string.
' this happens automatically when a byte array is copied
' to a string.
'
wrkStr = wrkByte

' return everything upto the the null terminator.
'
UtoA = Left(wrkStr, InStr(wrkStr, Chr(0)) - 1)
End Function

'In a form
Option Explicit
Private Sub Form_Load()
m_lblStatus.Caption = ""


' Good test - admin share
'
TestShareGetInfo "admin$"

' Good test - share with leading slash
'
TestShareGetInfo "admin$"

' Good test - share with trailing slash
'
TestShareGetInfo "admin$"

' Good test - share with trailing slash
'
TestShareGetInfo "admin$"

' Good test
'
TestShareGetInfo "testdata"

' Good test - should not have server name, but we fix that
'
TestShareGetInfo "\leetestdata"

' Good test - should not have server name, but we fix that
'
TestShareGetInfo "\leeadmin$"

' *** Good test - remote server
'
TestShareGetInfo "\maggieadmin$"

' *** Bad test - no share
'
TestShareGetInfo "NoShareCalledThis"

' *** Bad test - no remote share
'
TestShareGetInfo "\maggieNoShareCalledThis"

End Sub
Private Sub TestShareGetInfo(strShare As String)
Dim x As New CprgNetShareGetInfo

m_lblStatus.Caption = m_lblStatus.Caption _
& "Test Share: " & strShare & " = "

x.GetInfo strShare
If x.nLastError = 0 Then
m_lblStatus.Caption = m_lblStatus.Caption _
& vbCrLf & " Server: " & x.strServer _
& " Path: " & x.strPath & vbCrLf
Else
m_lblStatus.Caption = m_lblStatus.Caption _
& vbCrLf & " Error: " _
& x.nLastError & " " & x.strLastError & vbCrLf
End If

End Sub

Un salludo
sdemingo