说三道四技术文摘-感悟人生的经典句子
说三道四 > 文档快照

通过WnetEnumResource函数获得网络资源 -VB资料

HTML文档下载 WORD文档下载 PDF文档下载
通过WnetEnumResource函数获得网络资源 -VB资料

Create a new project and add the following code to the form:
Option Explicit

Private Const GMEM_FIXED = &H0
Private Const GMEM_ZEROINIT = &H40
Private Const GPTR = (GMEM_FIXED Or GMEM_ZEROINIT)

Private 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 CopyPointer2String Lib "KERNEL32" _
Alias "lstrcpyA" ( _
ByVal NewString As String, ByVal OldString As Long) As Long

Private Sub Form_click()
Dim hEnum As Long, lpBuff As Long, nr As NETRESOURCE
Dim cbBuff As Long, cCount As Long
Dim p As Long, res As Long, i As Long

'Setup the NETRESOURCE input structure.
nr.dwUsage = RESOURCEUSAGE_CONTAINER
nr.lpRemoteName = 0
cbBuff = 1000
cCount = &HFFFFFFFF

'Open a Net enumeration operation handle: hEnum.
res = WNetOpenEnum(RESOURCE_CONNECTED, RESOURCETYPE_ANY, _
0, nr, hEnum)
If res = 0 Then
'Create a buffer large enough for the results.
'1000 bytes should be sufficient.
lpBuff = GlobalAlloc(GPTR, cbBuff)
'Call the enumeration function.
res = WNetEnumResource(hEnum, cCount, lpBuff, cbBuff)
If res = 0 Then
p = lpBuff
Cls
'WNetEnumResource fills the buffer with an array of
'NETRESOURCE structures. Walk through the list and print
'each local and remote name.
For i = 1 To cCount
CopyMemory nr, ByVal p, LenB(nr)
p = p + LenB(nr)
Print PointerToString(nr.lpLocalName), _
PointerToString(nr.lpRemoteName)
Next i
Else
MsgBox "Error: " & Err.LastDllError, vbOKOnly, _
"WNetEnumResources"
End If
If lpBuff <> 0 Then GlobalFree (lpBuff)
WNetCloseEnum (hEnum) 'Close the enumeration
Else
MsgBox "Error: " & Err.LastDllError, vbOKOnly, "WNetOpenEnum"
End If
End Sub

Private Function PointerToString(p As Long) As String
'The values returned in the NETRESOURCE structures are pointers to
'ANSI strings so they need to be converted to Visual Basic
Strings.
Dim s As String
s = String(255, Chr$(0))
CopyPointer2String s, p
PointerToString = Left(s, InStr(s, Chr$(0)) - 1)
End Function
备案号:鲁ICP备13029499号-2 说三道四 www.s3d4.cn 说三道四技术文摘