小弟我写了个OPC客户端程序，但读不下来数据，为什么呢
我写了个OPC客户端程序，但读不上来数据，为什么呢？
程序如下：
Option Explicit
Dim ServerName As String
Dim NodeName As String
Dim GroupName As String
Dim MaxITEMNum As Long
Dim BranchCnt As Integer
Dim LeafCnt As Integer
Dim WithEvents MyOPCServer As OPCServer
Dim WithEvents MyOPCGroup As OPCGroup
Dim MyOPCGroupColl As OPCGroups
Dim MyOPCItemColl As OPCItems
Dim MyOPCItems As OPCItems
Dim MyOPCItem As OPCItem
'
Dim ClientHandles(4) As Long
Dim ServerHandles() As Long
Dim DataReadItem(4) As String
Dim DataReadValue(4) As Variant
Dim errors() As Long
Dim ServerHandlesIn() As Long
Dim ServerHandlesOut() As Long
Dim TrandID As Long
Dim CancelID As Long
'
Dim itemv() As Variant
Dim itemq() As Long
Dim OPCVache As Integer
Dim ItemNums As Long
Dim ii As Integer
Private Sub Connect_Click()
Dim ItemNum As Integer
Set MyOPCServer = New OPCServer
'OPCServer connection
ServerName = Text1.Text
NodeName = "WWW-6C0E52EE8D2"
MyOPCServer.Connect ServerName, NodeName
'Create OPCGroups
Set MyOPCGroupColl = MyOPCServer.OPCGroups
MyOPCGroupColl.DefaultGroupIsActive = True
'Create ReadGroup
Set MyOPCGroup = MyOPCGroupColl.Add("Group1")
'add items for Read group
'-----------Settings for ReadGroup
MyOPCGroup.IsSubscribed = True 'must be true when using asyn read and write
MyOPCGroup.UpdateRate = 1000
ItemNums = 4
DataReadItem(1) = "NewTag"
DataReadItem(2) = "NewTag_1"
DataReadItem(3) = "NewTag_2"
DataReadItem(4) = "NewTag_3"
ClientHandles(1) = 1
ClientHandles(2) = 2
ClientHandles(3) = 3
ClientHandles(4) = 4
MyOPCGroup.OPCItems.AddItems ItemNums, DataReadItem(), ClientHandles(), ServerHandles(), errors()
End Sub
Private Sub GetServerList_Click()
Call GetServer
End Sub
Sub GetServer()
List1.Clear
'initiate a OPCServer
Set MyOPCServer = New OPCServer
'get this node's server list
Dim ServerList
NodeName = "WWW-6C0E52EE8D2"
'Return a array of Severnamelist
ServerList = MyOPCServer.GetOPCServers(NodeName)
'list all the servers
For ii = LBound(ServerList) To UBound(ServerList)
程序如下：
Option Explicit
Dim ServerName As String
Dim NodeName As String
Dim GroupName As String
Dim MaxITEMNum As Long
Dim BranchCnt As Integer
Dim LeafCnt As Integer
Dim WithEvents MyOPCServer As OPCServer
Dim WithEvents MyOPCGroup As OPCGroup
Dim MyOPCGroupColl As OPCGroups
Dim MyOPCItemColl As OPCItems
Dim MyOPCItems As OPCItems
Dim MyOPCItem As OPCItem
'
Dim ClientHandles(4) As Long
Dim ServerHandles() As Long
Dim DataReadItem(4) As String
Dim DataReadValue(4) As Variant
Dim errors() As Long
Dim ServerHandlesIn() As Long
Dim ServerHandlesOut() As Long
Dim TrandID As Long
Dim CancelID As Long
'
Dim itemv() As Variant
Dim itemq() As Long
Dim OPCVache As Integer
Dim ItemNums As Long
Dim ii As Integer
Private Sub Connect_Click()
Dim ItemNum As Integer
Set MyOPCServer = New OPCServer
'OPCServer connection
ServerName = Text1.Text
NodeName = "WWW-6C0E52EE8D2"
MyOPCServer.Connect ServerName, NodeName
'Create OPCGroups
Set MyOPCGroupColl = MyOPCServer.OPCGroups
MyOPCGroupColl.DefaultGroupIsActive = True
'Create ReadGroup
Set MyOPCGroup = MyOPCGroupColl.Add("Group1")
'add items for Read group
'-----------Settings for ReadGroup
MyOPCGroup.IsSubscribed = True 'must be true when using asyn read and write
MyOPCGroup.UpdateRate = 1000
ItemNums = 4
DataReadItem(1) = "NewTag"
DataReadItem(2) = "NewTag_1"
DataReadItem(3) = "NewTag_2"
DataReadItem(4) = "NewTag_3"
ClientHandles(1) = 1
ClientHandles(2) = 2
ClientHandles(3) = 3
ClientHandles(4) = 4
MyOPCGroup.OPCItems.AddItems ItemNums, DataReadItem(), ClientHandles(), ServerHandles(), errors()
End Sub
Private Sub GetServerList_Click()
Call GetServer
End Sub
Sub GetServer()
List1.Clear
'initiate a OPCServer
Set MyOPCServer = New OPCServer
'get this node's server list
Dim ServerList
NodeName = "WWW-6C0E52EE8D2"
'Return a array of Severnamelist
ServerList = MyOPCServer.GetOPCServers(NodeName)
'list all the servers
For ii = LBound(ServerList) To UBound(ServerList)