如何添加和移去网络连接
（作者： 2000年04月30日 16:17）
[程序语言] Microsoft Visual Basic 4.0,5.0,6.0
[运行平台] WINDOWS
[源码来源] http://support.microsoft.com/support/kb/articles/q173/0/11.asp?FR=0
[功能描述] 该程序演示了如何通过使用Windows API函数，来创建和移去网络连接。
步骤：
1)创建新的标准EXE项目。
2)把模块填加到项目中。
3)把下面的说明语句贴到模块中：(注意：如果你加到表单模块中，把所有条目设置为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
Declare Function WNetCancelConnection2 Lib "mpr.dll" Alias _
"WNetCancelConnection2A" (ByVal lpName As String, _
ByVal dwFlags As Long, ByVal fForce As Long) As Long
Type NETRESOURCE
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 Const NO_ERROR = 0
Public Const CONNECT_UPDATE_PROFILE = &H1
' The following includes all the constants defined for NETRESOURCE,
' not just the ones used in this example.
Public Const RESOURCETYPE_DISK = &H1
Public Const RESOURCETYPE_PRINT = &H2
Public Const RESOURCETYPE_ANY = &H0
Public Const RESOURCE_CONNECTED = &H1
Public Const RESOURCE_REMEMBERED = &H3
Public Const RESOURCE_GLOBALNET = &H2
Public Const RESOURCEDISPLAYTYPE_DOMAIN = &H1
Public Const RESOURCEDISPLAYTYPE_GENERIC = &H0
Public Const RESOURCEDISPLAYTYPE_SERVER = &H2
Public Const RESOURCEDISPLAYTYPE_SHARE = &H3
Public Const RESOURCEUSAGE_CONNECTABLE = &H1
Public Const RESOURCEUSAGE_CONTAINER = &H2
' Error Constants:
Public Const ERROR_ACCESS_DENIED = 5&
Public Const ERROR_ALREADY_ASSIGNED = 85&
Public Const ERROR_BAD_DEV_TYPE = 66&
Public Const ERROR_BAD_DEVICE = 1200&
Public Const ERROR_BAD_NET_NAME = 67&
Public Const ERROR_BAD_PROFILE = 1206&
Public Const ERROR_BAD_PROVIDER = 1204&
Public Const ERROR_BUSY = 170&
Public Const ERROR_CANCELLED = 1223&
Public Const ERROR_CANNOT_OPEN_PROFILE = 1205&
Public Const ERROR_DEVICE_ALREADY_REMEMBERED = 1202&
Public Const ERROR_EXTENDED_ERROR = 1208&
Public Const ERROR_INVALID_PASSWORD = 86&
Public Const ERROR_NO_NET_OR_BAD_PATH = 1203&
4)在表单Form1中添加两个命令按钮：Command1 和 Command2。
5)把下面的代码添加到Form1中，设置好合法的共享名"\\ServerName\ShareName"：
Option Explicit
Private Sub Command1_Click()
Dim NetR As NETRESOURCE
Dim ErrInfo As Long
Dim MyPass As String, MyUser As String
NetR.dwScope = RESOURCE_GLOBALNET
NetR.dwType = RESOURCETYPE_DISK
NetR.dwDisplayType = RESOURCEDISPLAYTYPE_SHARE
NetR.dwUsage = RESOURCEUSAGE_CONNECTABLE
NetR.lpLocalName = "X:" ' If undefined, Connect with no device
NetR.lpRemoteName = "\\ServerName\ShareName" ' Your valid share
'NetR.lpComment = "Optional Comment"
'NetR.lpProvider = ' Leave this undefined
' If the UserName and Password arguments are NULL, the user context
' for the process provides the default user name.
ErrInfo = WNetAddConnection2(NetR, MyPass, MyUser, _
CONNECT_UPDATE_PROFILE)
If ErrInfo = NO_ERROR Then
MsgBox "Net Connection Successful!", vbInformation, _
"Share Connected"
Else
MsgBox "ERROR: " & ErrInfo & " - Net Connection Failed!", _
vbExclamation, "Share not Connected"
End If
End Sub
Private Sub Command2_Click()
Dim ErrInfo As Long
Dim strLocalName As String
' You may specify either the lpRemoteName or lpLocalName
'strLocalName = "\\ServerName\ShareName"
strLocalName = "X:"
ErrInfo = WNetCancelConnection2(strLocalName, _
CONNECT_UPDATE_PROFILE, False)
If ErrInfo = NO_ERROR Then
MsgBox "Net Disconnection Successful!", vbInformation, _
"Share Disconnected"
Else
MsgBox "ERROR: " & ErrInfo & " - Net Disconnection Failed!", _
vbExclamation, "Share not Disconnected"
End If
End Sub
6)运行该项目，点击Command1按钮。你会得到一个信息框指示是否成功。如果成功，你可以在Windows Explorer中看到新的连接(如果你没有定义lpLocalName，连接不会显示在Explorer中)。点击 Command2后，在 Explorer中就会看到该连接被去掉。
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