通过WnetEnumResource函数获得网络资源




 

       

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