我有一个程序需要将数据放在网络共享上。在某些情况下,用户无法通过其帐户访问,并且需要提供凭据才能登录。
我的想法是让程序弹出 Windows 凭据屏幕,以便用户可以登录(就像用户通过 Windows 资源管理器打开共享时一样)。
我找到了 WNetUseConnection
允许在不映射共享的情况下登录共享的 API,并且它有提供提示的选项。
这是我正在使用的代码:
Public Class frmMain
Private Const CONNECT_INTRERACTIVE = &H8
Private Const CONNECT_PROMPT = &H10
Private Const RESOURCETYPE_DISK = &H1
Private Structure NETRESOURCE
Public dwScope As Long
Public dwType As Long
Public dwDisplayType As Long
Public dwUsage As Long
Public lpLocalName As String
Public lpRemoteName As String
Public lpComment As String
Public lpProvider As String
End Structure
Private Declare Function WNetUseConnection Lib "mpr.dll" _
Alias "WNetUseConnectionA" ( _
ByVal hwndOwner As Long, _
ByRef lpNetResource As NETRESOURCE, _
ByVal lpUsername As String, _
ByVal lpPassword As String, _
ByVal dwFlags As Long, _
ByVal lpAccessName As String, _
ByRef lpBufferSize As Long, _
ByRef lpResult As Long) _
As Long
Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim resource As New NETRESOURCE
Dim success As Long
Dim ErrInfo As Long
With resource
.dwType = RESOURCETYPE_DISK
.lpLocalName = vbNullString
.lpRemoteName = "\\server\folder\"
.lpProvider = vbNullString
End With
ErrInfo = WNetUseConnection(Me.Handle, resource, "", "", CONNECT_INTRERACTIVE Or CONNECT_PROMPT, vbNull, vbNull, success)
Console.WriteLine(ErrInfo)
Dim errorMessage As String
errorMessage = New Win32Exception().Message
Console.WriteLine(errorMessage)
End Sub
我回来的错误是:
The handle is invalid (code 2091649073639).
有没有办法让这个工作?
最佳答案
您发布的代码似乎有几个问题:
HWND
-> IntPtr
LPDWORD
-> IntPtr
DWORD
-> UInt32
(我也见过 Integer
使用过)使用
IntPtr
允许运行时使用 32 位或 64 位指针,具体取决于机器架构。 DWORD
s 总是 32 位,即使在 64 位机器上。另见:Visual C++: How large is a DWORD with 32- and 64-bit code? .lpRemoteName = "\\server\folder\"
应该
.lpRemoteName = "\\server\folder"
buffer
参数以使代码工作。没有它,WNetUseConnection
函数总是返回 ERROR_MORE_DATA
,这意味着缓冲区太小。 这是我使用的完整代码(在 Windows 8 64 位、Windows 7 32 位上测试):
Imports System.ComponentModel
Imports System.Text
Public Class frmMain
Private Const CONNECT_INTRERACTIVE = &H8
Private Const CONNECT_PROMPT = &H10
Private Const RESOURCETYPE_DISK = &H1
Private Structure NETRESOURCE
Public dwScope As UInt32
Public dwType As UInt32
Public dwDisplayType As UInt32
Public dwUsage As UInt32
Public lpLocalName As String
Public lpRemoteName As String
Public lpComment As String
Public lpProvider As String
End Structure
Private Declare Function WNetUseConnection Lib "mpr.dll" _
Alias "WNetUseConnectionA" ( _
ByVal hwndOwner As IntPtr, _
ByRef lpNetResource As NETRESOURCE, _
ByVal lpPassword As String, _
ByVal lpUsername As String, _
ByVal dwFlags As UInt32, _
ByVal lpAccessName As StringBuilder, _
ByRef lpBufferSize As IntPtr, _
ByRef lpResult As IntPtr) _
As UInt32
Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim resource As New NETRESOURCE
Dim success As Long
Dim ErrInfo As Long
Const BUFFERSIZE As Integer = 1024
Dim buffer As New StringBuilder(BUFFERSIZE)
With resource
.dwType = RESOURCETYPE_DISK
.lpLocalName = vbNullString
.lpRemoteName = "\\server\folder"
.lpProvider = vbNullString
End With
ErrInfo = WNetUseConnection(Me.Handle, resource, "", "", CONNECT_INTRERACTIVE Or CONNECT_PROMPT, buffer, BUFFERSIZE, success)
If ErrInfo > 0 Then
Dim winExcept As New Win32Exception()
LogMsg(winExcept.Message)
Else
LogMsg("all good")
End If
End Sub
Private Sub LogMsg(ByVal msg As String)
System.Diagnostics.Debug.WriteLine(msg)
MsgBox(msg)
End Sub
End Class
关于.net - 尝试连接到网络共享时句柄无效,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19859770/