发送消息方面的两个问题

第一个问题：msdn中说         Windows 95/98: Unsupported. 也就不支持该函数！
第二个问题：一老外写的form的
Option ExplicitPrivate NetRoot As NetResource
Private Sub NodeExpand(Node As MSComctlLib.Node)
' Distinguish between expansion of a network object or a file system folder as seen over the networkDim FSO As Scripting.FileSystemObject
Dim NWFolder As Scripting.Folder
Dim FilX As Scripting.File, DirX As Scripting.Folder
Dim tNod As Node, isFSFolder As Boolean' Remove the fake node used to force the treeview to show the "+" icon
tvwNetwork.Nodes.Remove Node.Key + "_FAKE"' If this node is ed as a share is it a proper networked directory?
' need to make this check since NDS s some containers (wrongly, in my opinion) as shares when they're not applicable to
' file system directories (i.e. the two containers deing NDS and Novell FileServers are ed as shares)
If Node.SelectedImage = "share" Then
    On Error Resume Next
    Set FSO = New FileSystemObject
    Set NWFolder = FSO.GetFolder(Node.Key)
    If Err <> 0 Then isFSFolder = False Else isFSFolder = True
    On Error GoTo 0
End IfIf Node.SelectedImage = "folder" Or (Node.SelectedImage = "share" And isFSFolder = True) Then
    ' This node is a filesystem folder seen via a network UNC path
    ' Use FileSystemObjects to get files and directories since network objects (generally) can't see these
    '
    Set FSO = New Scripting.FileSystemObject
    Set NWFolder = FSO.GetFolder(Node.Key)  ' The node's key holds the UNC path to the directory
    ' Enumerate the files in this folder
    ' To save any more confusion I'm not querying the system to get an icon for each file and executable
    ' If there's a demand I'll do a modified version, but for the moment I'm just using a generic file icon
    For Each FilX In NWFolder.Files
        tvwNetwork.Nodes.Add Node.Key, tvwChild, Node.Key + "\" + FilX.Name, FilX.Name, "file", "file"
    Next
    ' Enumerate the folders
    For Each DirX In NWFolder.SubFolders
        Set tNod = tvwNetwork.Nodes.Add(Node.Key, tvwChild, Node.Key + "\" + DirX.Name, DirX.Name, "folder", "folder")
        tvwNetwork.Nodes.Add tNod.Key, tvwChild, tNod.Key + "_FAKE", "FAKE", "folder", "folder"
        tNod.Tag = "N"
    Next
    Node.Tag = "Y"
Else
    ' Search up through the tree, noting the node keys so that we can then locate the NetResource object
    ' under NetRoot.
    Dim pS As String, kPath() As String, nX As NetResource, i As Integer, tX As NetResource
    Set tNod = Node ' Start at the node that was expanded
    Do While Not tNod.Parent Is Nothing ' Proceed up the tree using parent references, each time saving the node key to the string pS
        pS = tNod.Key + "|" + pS
        Set tNod = tNod.Parent
    Loop
    ' String pS is now of the form "<Node Key>|<Node Key>|<Node Key>"
    ' Split this into an array using the VB6 Split function
    kPath = Split(pS, "|")
    Set nX = NetRoot
    ' Now loop through this array, this time following down the tree of NetResource objects from NetRoot to the child NetResource object that corresponds to
    ' the node the user clicked
    For i = 0 To UBound(kPath) - 1
        Set nX = nX.Children(kPath(i))
    Next
    ' Now that we know both the node and the corresponding NetResource we can enumerate the children and add the nodes
    For Each tX In nX.Children
        Set tNod = tvwNetwork.Nodes.Add(nX.RemoteName, tvwChild, tX.RemoteName, tX.ShortName, LCase(tX.ResourceTypeName), LCase(tX.ResourceTypeName))
        tNod.Tag = "N"
        ' Add fake nodes to all new nodes except when they're printers (you can always be sure a printer never has children)
        If tX.ResourceType <> Printer Then tvwNetwork.Nodes.Add tX.RemoteName, tvwChild, tX.RemoteName + "_FAKE", "FAKE", "server", "server"
    Next
    tvwNetwork.Refresh  ' Refresh the view
    Node.Tag = "Y"  ' Set the tag to "Y" to denote that this node has been expanded and populated
End IfEnd Sub
Private Sub Form_Load()
' Centre the form on the screen
Me.Top = (Screen.Height - Me.Height) / 2
Me.Left = (Screen.Width - Me.Width) / 2Dim nX As NetResource, nodX As Node
tvwNetwork.ImageList = imlNWImages
Set NetRoot = New NetResource   ' Create a new NetResource object. By default it will be the network root
Set nodX = tvwNetwork.Nodes.Add(, , "_ROOT", "Entire Network", "root", "root")  ' Add a node into the tree for it
nodX.Tag = "Y"  ' Set populated flag to "Y" since we populate this one immediately
' Populate the top level of objects under "Entire Network"
For Each nX In NetRoot.Children
    Set nodX = tvwNetwork.Nodes.Add("_ROOT", tvwChild, nX.RemoteName, nX.ShortName, LCase(nX.ResourceTypeName), LCase(nX.ResourceTypeName))
    nodX.Tag = "N"  ' We haven't populated the nodes underneath this one yet, so set its flag to "N"
    tvwNetwork.Nodes.Add nodX.Key, tvwChild, nodX.Key + "_FAKE", "FAKE", "server", "server" ' Create a fake node under it so that the treeview gives the "+" symbol
    nodX.EnsureVisible
Next
' You can't get printers at this level, so there's no point in enumerating the NWPrinters collections yet
End SubPrivate Sub Form_Resize()
tvwNetwork.Width = Me.ScaleWidth
tvwNetwork.Height = Me.ScaleHeight
End Sub
Private Sub tvwNetwork_Expand(ByVal Node As MSComctlLib.Node)
If Node.Tag = "N" Then
    NodeExpand Node
End If
End Sub

Public Enum NetResourceTypes    ' Enum of possible types of NetResource
    Generic = 0
    Domain = 1
    Server = 2
    share = 3
    File = 4
    Group = 5
    Network = 6
    Root = 7
    ShareAdmin = 8
    Directory = 9
    Tree = 10
    NDSContainer = 11
    Printer = &HFF
End EnumPrivate mvNetRes As NETRES2
Private mvGotChildren As Boolean
Private mvChildren As NetResources  ' Collection of child containers and disk objects (what you usually get in the Network Neighborhood tree)
Private mvAmRoot As Boolean
Private mvAmPrinter As BooleanPrivate Declare Function GlobalAlloc Lib "KERNEL32" (ByVal wFlags As Long, ByVal dwBytes As Long) As Long
Private Declare Function GlobalFree Lib "KERNEL32" (ByVal hMem As Long) As Long
Private Declare Sub CopyMemory Lib "KERNEL32" Alias "RtlMoveMemory" (hpvDest As Any, hpvSource As Any, ByVal cbCopy As Long)
Private Declare Function lstrcpyA Lib "KERNEL32" Alias "lstrcpy" (ByVal NewString As String, ByVal OldString As Long) As Long
Private Declare Function WNetOpenEnum Lib "mpr.dll" Alias "WNetOpenEnumA" (ByVal dwScope As Long, ByVal dwType As Long, ByVal dwUsage As Long, lpNetResource As Any, lphEnum As Long) As Long
Private Declare Function WNetEnumResource Lib "mpr.dll" Alias "WNetEnumResourceA" (ByVal hEnum As Long, lpcCount As Long, ByVal lpBuffer As Long, ByRef lpBufferSize As Long) As Long
Private Declare Function WNetCloseEnum Lib "mpr.dll" (ByVal hEnum As Long) As LongPrivate Type sNETRESOURCE ' API compatible NETRESOURCE structure
    dwScope As Long       ' All members expressed as Long pointers
    dwType As Long
    dwDisplayType As Long
    dwUsage As Long
    lpLocalName As Long
    lpRemoteName As Long
    lpComment As Long
    lpProvider As Long
End Type

Private Type NETRES2 ' VB compatible NETRESOURCE structure
    dwScope As Long  ' Members mapped back to VB datatypes
    dwType As Long
    dwDisplayType As Long
    dwUsage As Long
    lpLocalName As String
    lpRemoteName As String
    lpComment As String
    lpProvider As String
End TypePrivate Const RESOURCE_CONNECTED = &H1
Private Const RESOURCE_GLOBALNET = &H2
Private Const RESOURCE_REMEMBERED = &H3
Private Const RESOURCE_CONTEXT = &H5Private Const RESOURCETYPE_ANY = &H0
Private Const RESOURCETYPE_DISK = &H1
Private Const RESOURCETYPE_PRINT = &H2
Private Const RESOURCETYPE_UNKNOWN = &HFFFFPrivate Const RESOURCEUSAGE_CONNECTABLE = &H1
Private Const RESOURCEUSAGE_CONTAINER = &H2
Private Const RESOURCEUSAGE_RESERVED = &H80000000Private Const GMEM_DDESHARE = &H2000
Private Const GMEM_DISCARDABLE = &H100
Private Const GMEM_DISCARDED = &H4000
Private Const GMEM_FIXED = &H0
Private Const GMEM_INVALID_HANDLE = &H8000
Private Const GMEM_LOCKCOUNT = &HFF
Private Const GMEM_MODIFY = &H80
Private Const GMEM_MOVEABLE = &H2
Private Const GMEM_NOCOMPACT = &H10
Private Const GMEM_NODISCARD = &H20
Private Const GMEM_NOT_BANKED = &H1000
Private Const GMEM_NOTIFY = &H4000
Private Const GMEM_SHARE = &H2000
Private Const GMEM_VALID_FLAGS = &H7F72
Private Const GMEM_ZEROINIT = &H40
Private Const GPTR = (GMEM_FIXED Or GMEM_ZEROINIT)Private Const ERROR_MORE_DATA = 234Private Const RESOURCEDISPLAYTYPE_GENERIC = 0
Private Const RESOURCEDISPLAYTYPE_DOMAIN = 1
Private Const RESOURCEDISPLAYTYPE_SERVER = 2
Private Const RESOURCEDISPLAYTYPE_SHARE = 3
Private Const RESOURCEDISPLAYTYPE_FILE = 4
Private Const RESOURCEDISPLAYTYPE_GROUP = 5
Private Const RESOURCEDISPLAYTYPE_NETWORK = 6
Private Const RESOURCEDISPLAYTYPE_ROOT = 7
Private Const RESOURCEDISPLAYTYPE_SHAREADMIN = 8
Private Const RESOURCEDISPLAYTYPE_DIRECTORY = 9
Private Const RESOURCEDISPLAYTYPE_TREE = &HA
Private Const RESOURCEDISPLAYTYPE_NDSCONTAINER = &HBPrivate Sub GetPrinters()
' API wrangling...
' Basically the same routine as GetChildren but tweaked to only return printer objects
' It also discards all non-share objects since we only want printers for this enumeration' Initialise my collection and variables
Dim hEnum As Long, lpBuff As Long
Dim cbBuff As Long, cCount As Long
Dim p As Long, res As Long, i As Long
Dim EnumHTemp As Long
Dim reqBufferSize As Long
Dim nR As sNETRESOURCE  ' API friendly structure
Dim tempRes As NETRES2  ' VB friendly structure
Dim tChild As NetResource' If this object is the Network root then we need to make a slight adjustment to the starting values
' of our API friendly NETRESOURCE structure
If mvAmRoot Then
    nR.dwUsage = RESOURCEUSAGE_CONNECTABLE
    nR.lpRemoteName = 0
End If' Open a net enumeration
' Limit enumeration to connectable print resources (i.e. printer objects)
res = WNetOpenEnum(RESOURCE_GLOBALNET, RESOURCETYPE_PRINT, RESOURCEUSAGE_CONNECTABLE, mvNetRes, hEnum)' Check for errors
If res <> 0 Then
    ' Error returned when trying to open the enumeration
    ' Probably means we don't have access to see its children.
    ' See the MSDN for more details on possible errors.
    ' Currently no trapping is done here and the routine just exits with an empty children collection
    Exit Sub
End If' Now begin to enumerate the collection
EnumHTemp = hEnum
' Allocate a default buffer for the NETRESOURCE structure returned from the enum routine, say 1K
cbBuff = 1024&
lpBuff = GlobalAlloc(GPTR, cbBuff)
Do
    EnumHTemp = hEnum
    cCount = &HFFFFFFFF ' Number of entries to return from enumeration - &HFFFFFFFF causes all objects to be returned
    res = WNetEnumResource(hEnum, cCount, lpBuff, cbBuff)
    If res = ERROR_MORE_DATA Then
        ' The enumeration has reported that the lpBuff is not big enough to hold all of the information in the
        ' NETRESOURCE structure. cbBuff has been updated to hold the required amount of space.
        GlobalFree lpBuff   ' Free the memory we're using for the current small buffer
        lpBuff = GlobalAlloc(GPTR, cbBuff)  ' Allocate a new space of the size requested by the enumeration
    Else
        If res = 0 Then     ' No error
            p = lpBuff
            ' cCount holds the number of NETRESOURCE structures returned in this pass
            ' (The enumeration returns as many as will fit into the buffer)
            For i = 1 To cCount ' Loop through the buffer, tackling each structure in turn
                CopyMemory nR, ByVal p, LenB(nR)    ' Copy the block of memory representing the structure into a local API friendly NETRESOURCE structure
                p = p + LenB(nR)    ' Step forward in the buffer by the length of the copied structure
                If nR.dwDisplayType = RESOURCEDISPLAYTYPE_SHARE Then
                    tempRes.dwDisplayType = nR.dwDisplayType
                    tempRes.dwScope = nR.dwScope
                    tempRes.dwType = nR.dwType
                    tempRes.dwUsage = nR.dwUsage
                    tempRes.lpComment = lStrCpy(nR.lpComment)
                    tempRes.lpLocalName = lStrCpy(nR.lpLocalName)
                    tempRes.lpProvider = lStrCpy(nR.lpProvider)
                    tempRes.lpRemoteName = lStrCpy(nR.lpRemoteName)
                    Set tChild = New NetResource
                    tChild.NRStruct = tempRes
                    tChild.IsPrinter = True ' I know this is a bit of a fudge, but I didn't think it worth the effort to write polymorphic classes for such a small matter
                    mvChildren.Add tChild
                End If
            Next
        End If
    End If
Loop Until cCount = 0
' Close the enum
WNetCloseEnum hEnum
' Free the memory
GlobalFree lpBuffEnd Sub

Friend Property Let IsPrinter(pVal As Boolean)
mvAmPrinter = pVal
End PropertyPrivate Function lStrCpy(lStrPointer As Long) As String
Dim TString As String
TString = String(255, Chr$(0))
lstrcpyA TString, lStrPointer
lStrCpy = Left(TString, InStr(TString, Chr$(0)) - 1)
End FunctionPublic Property Get Children() As NetResources
If Not mvGotChildren Then GetChildren
Set Children = mvChildren
End PropertyPublic Property Get Comment() As String
Comment = mvNetRes.lpComment
End PropertyPrivate Sub GetChildren()
' API wrangling...' Initialise my collection and variables
Set mvChildren = New NetResources
Dim hEnum As Long, lpBuff As Long
Dim cbBuff As Long, cCount As Long
Dim p As Long, res As Long, i As Long
Dim EnumHTemp As Long
Dim reqBufferSize As Long
Dim nR As sNETRESOURCE  ' API friendly structure
Dim tempRes As NETRES2  ' VB friendly structure
Dim tChild As NetResource' If this object is the Network root then we need to make a slight adjustment to the starting values
' of our API friendly NETRESOURCE structure
If mvAmRoot Then
    nR.dwUsage = RESOURCEUSAGE_CONNECTABLE
    nR.lpRemoteName = 0
End If' Open a net enumeration
res = WNetOpenEnum(RESOURCE_GLOBALNET, RESOURCETYPE_DISK, 0, mvNetRes, hEnum)' Check for errors
If res <> 0 Then
    ' Error returned when trying to open the enumeration
    ' Probably means we don't have access to see its children.
    ' See the MSDN for more details on possible errors.
    ' Currently no trapping is done here and the routine just exits with an empty children collection
    Exit Sub
End If' Now begin to enumerate the collection
EnumHTemp = hEnum
' Allocate a default buffer for the NETRESOURCE structure returned from the enum routine, say 1K
cbBuff = 1024&
lpBuff = GlobalAlloc(GPTR, cbBuff)
Do
    EnumHTemp = hEnum
    cCount = &HFFFFFFFF ' Number of entries to return from enumeration - &HFFFFFFFF causes all objects to be returned
    res = WNetEnumResource(hEnum, cCount, lpBuff, cbBuff)
    If res = ERROR_MORE_DATA Then
        ' The enumeration has reported that the lpBuff is not big enough to hold all of the information in the
        ' NETRESOURCE structure. cbBuff has been updated to hold the required amount of space.
        GlobalFree lpBuff   ' Free the memory we're using for the current small buffer
        lpBuff = GlobalAlloc(GPTR, cbBuff)  ' Allocate a new space of the size requested by the enumeration
    Else
        If res = 0 Then     ' No error
            p = lpBuff
            ' cCount holds the number of NETRESOURCE structures returned in this pass
            ' (The enumeration returns as many as will fit into the buffer)
            For i = 1 To cCount ' Loop through the buffer, tackling each structure in turn
                CopyMemory nR, ByVal p, LenB(nR)    ' Copy the block of memory representing the structure into a local API friendly NETRESOURCE structure
                p = p + LenB(nR)    ' Step forward in the buffer by the length of the copied structure
                tempRes.dwDisplayType = nR.dwDisplayType    ' Begin copying the members of the API friendly structure to the VB friendly structure
                tempRes.dwScope = nR.dwScope
                tempRes.dwType = nR.dwType
                tempRes.dwUsage = nR.dwUsage
                tempRes.lpComment = lStrCpy(nR.lpComment)   ' String copies accomplished by using the lStrCpy routine
                tempRes.lpLocalName = lStrCpy(nR.lpLocalName)
                tempRes.lpProvider = lStrCpy(nR.lpProvider)
                tempRes.lpRemoteName = lStrCpy(nR.lpRemoteName)
                Set tChild = New NetResource    ' Create the new NetResource object that will be the new child
                tChild.NRStruct = tempRes   ' Pass the current VB friendly NETRESOURCE structure to tbe force populate method of the NetResource object
                mvChildren.Add tChild   ' Add the new object to my children collection
            Next
        End If
    End If
Loop Until cCount = 0
' Close the enum
WNetCloseEnum hEnum
' Free the memory
GlobalFree lpBuff' In order to distinguish printers from other shares we need to enumerate them separately
GetPrintersmvGotChildren = TrueEnd SubPublic Property Get LocalName() As String
LocalName = mvNetRes.lpLocalNameEnd Property
Friend Property Let NRStruct(RHS As NETRES2)
' Private force populate routine
' When a NetResource object it defaults to being the network root object
' The only way to change this is to call this routine and pass a VB friendly NETRES2 NETRESOURCE structure
' When this function is called correctly it populates the data for this NetResource and forces it to act as a child rather than
' a network root.
' When compiled as a COM DLL this function will not be visible to the user - it's intended for internal use only
mvNetRes = RHS
mvAmRoot = False
End PropertyPublic Property Get Provider() As String
Provider = mvNetRes.lpProvider
End PropertyPublic Property Get RemoteName() As String
RemoteName = mvNetRes.lpRemoteName
End Property
Public Property Get ResourceType() As NetResourceTypes
If Not mvAmPrinter Then ResourceType = mvNetRes.dwDisplayType Else ResourceType = PrinterEnd PropertyPublic Property Get ResourceTypeName() As String
' Provides a friendly name for the resource type as an alternative to using the enumerated "ResourceType" property
' This can be used to quicky bind NetResource objects to named images in an imagelist control (for example)
If mvAmPrinter Then
    ResourceTypeName = "Printer"
    Exit Property
End If
Select Case mvNetRes.dwDisplayType
    Case RESOURCEDISPLAYTYPE_GENERIC
        ResourceTypeName = "Generic"
    Case RESOURCEDISPLAYTYPE_DOMAIN
        ResourceTypeName = "Domain"
    Case RESOURCEDISPLAYTYPE_SERVER
        ResourceTypeName = "Server"
    Case RESOURCEDISPLAYTYPE_SHARE
        ResourceTypeName = "Share"
    Case RESOURCEDISPLAYTYPE_FILE
        ResourceTypeName = "File"
    Case RESOURCEDISPLAYTYPE_GROUP
        ResourceTypeName = "Group"
    Case RESOURCEDISPLAYTYPE_NETWORK
        ResourceTypeName = "Network"
    Case RESOURCEDISPLAYTYPE_ROOT
        ResourceTypeName = "Root"
    Case RESOURCEDISPLAYTYPE_SHAREADMIN
        ResourceTypeName = "AdminShare"
    Case RESOURCEDISPLAYTYPE_DIRECTORY
        ResourceTypeName = "Directory"
    Case RESOURCEDISPLAYTYPE_TREE
        ResourceTypeName = "Tree"
    Case RESOURCEDISPLAYTYPE_NDSCONTAINER
        ResourceTypeName = "NDSContainer"
End Select
End PropertyPublic Property Get ShortName() As String
' Return just the final part of the object's name (rather than a fully qualified path or context)
Dim i As Integer
i = InStrRev(mvNetRes.lpRemoteName, "\")
ShortName = Right(mvNetRes.lpRemoteName, Len(mvNetRes.lpRemoteName) - i)
End Property
Private Sub Class_Initialize()
mvAmRoot = True
End Sub
Private Sub Class_Terminate()
Set mvChildren = Nothing
End Sub
'上面这段是class NetResource

下面是class NetResources的
Option Explicit'local variable to hold collection
Private mCol As CollectionFriend Function Add(objNewMember As NetResource) As NetResource
' Note : this function only allows adding of already extant objects. NetResource objects cannot be created
' by adding them to a NetResources collection since most of the network structure is hardware based and
' cannot be changed by software.

    'create a new object
    mCol.Add objNewMember, objNewMember.RemoteName
    'return the object created
    Set Add = objNewMemberEnd FunctionPublic Property Get Item(vntIndexKey As Variant) As NetResource
' This item routine is a slight modification from the norm
' If an invalid or unmatched key is passed then this property returns a Nothing object rather than an error
Dim nrX As NetResource
On Error Resume Next
Set nrX = mCol(vntIndexKey)
If Err <> 0 Then
    Set Item = Nothing
Else
    Set Item = nrX
End If
'Set Item = mCol(vntIndexKey)
End PropertyPublic Property Get Count() As Long
    'used when retrieving the number of elements in the
    'collection. Syntax: Debug.Print x.Count
    Count = mCol.Count
End Property
Public Sub Remove(vntIndexKey As Variant)
    'used when removing an element from the collection
    'vntIndexKey contains either the Index or Key, which is why
    'it is declared as a Variant
    'Syntax: x.Remove(xyz)
    mCol.Remove vntIndexKey
End Sub
Public Property Get NewEnum() As IUnknown
    'this property allows you to enumerate
    'this collection with the For...Each syntax
    Set NewEnum = mCol.[_NewEnum]
End Property
Private Sub Class_Initialize()
    'creates the collection when this class is created
    Set mCol = New Collection
End Sub
Private Sub Class_Terminate()
    'destroys collection when this class is terminated
    Set mCol = Nothing
End Sub

谢谢各位！关于第1个问题如何解决呢？难道真象wwqna(york) 所说的那样无法实现吗？请高手赐教。

调试易

发送消息方面的两个问题

解决方案 »