映射的网络驱动器无法在C#中列出

时间:2009-12-13 23:28:05

标签: c# mapped-drive driveinfo

我正在尝试列出我的应用程序中的所有本地驱动器,并DriveInfo.GetDrives提供本地驱动器号,我也需要映射驱动器。

目前我有:C:,D:和G:(HDD),E:和F:(CD),以及S:和Z :(映射网络驱动器)。 (是的,它们在Windows资源管理器中以及Total Commander中都可见。) 但是只能以编程方式检索C,D,E,F,G。

我还尝试了Environment.GetLogicalDrives()GetLogicalDriveStrings (pInvoke)FindFirstVolumeFindNextVolumen(pInvoke)。我试图在注册表中找到映射的驱动器列表。没有任何作用,只有HDD和CD字母被检索。

没有任何异常,直接WinAPI调用中没有指示错误,现在我被卡住了。这是某种安全设置吗?在我看的每个地方,人们都说DriveInfo.GetDrives应该回放映射的驱动器。这是真的吗?

我正在使用Vista Home Pro。应用程序从本地计算机运行,它也是使用Visual Studio 2008构建的。

我发布了我使用过的内容,但它很简单,我不能做错的事情:

foreach (System.IO.DriveInfo di in System.IO.DriveInfo.GetDrives())
    Console.WriteLine(di.Name);

结果:     C:\     d:\     E:\     F:\     G:\     按任意键继续 。 。

我怎样才能让它发挥作用?

2 个答案:

答案 0 :(得分:8)

好的,我发现了如何在Vista上获得断开连接的驱动器。不容易,但它是可行的:

首先,您需要以下WinAPI函数的pInvoke定义:

  • WNetOpenEnum
  • WNetEnumResource
  • WNetCloseEnum

那些需要结构和一些枚举。

然后你需要多次调用它们,最后,你得到列表。 这是代码,要注意,它很长:

    [DllImport("MPR.dll", CharSet = CharSet.Auto)]
    static extern int WNetEnumResource(IntPtr hEnum, ref int lpcCount, IntPtr lpBuffer, ref int lpBufferSize);

    [DllImport("MPR.dll", CharSet = CharSet.Auto)]
    static extern int WNetOpenEnum(RESOURCE_SCOPE dwScope, RESOURCE_TYPE dwType, RESOURCE_USAGE dwUsage,
        [MarshalAs(UnmanagedType.AsAny)][In] object lpNetResource, out IntPtr lphEnum);

    [DllImport("MPR.dll", CharSet = CharSet.Auto)]
    static extern int WNetCloseEnum(IntPtr hEnum);

    public enum RESOURCE_SCOPE : uint
    {
        RESOURCE_CONNECTED = 0x00000001,
        RESOURCE_GLOBALNET = 0x00000002,
        RESOURCE_REMEMBERED = 0x00000003,
        RESOURCE_RECENT = 0x00000004,
        RESOURCE_CONTEXT = 0x00000005
    }
    public enum RESOURCE_TYPE : uint
    {
        RESOURCETYPE_ANY = 0x00000000,
        RESOURCETYPE_DISK = 0x00000001,
        RESOURCETYPE_PRINT = 0x00000002,
        RESOURCETYPE_RESERVED = 0x00000008,
    }
    public enum RESOURCE_USAGE : uint
    {
        RESOURCEUSAGE_CONNECTABLE = 0x00000001,
        RESOURCEUSAGE_CONTAINER = 0x00000002,
        RESOURCEUSAGE_NOLOCALDEVICE = 0x00000004,
        RESOURCEUSAGE_SIBLING = 0x00000008,
        RESOURCEUSAGE_ATTACHED = 0x00000010,
        RESOURCEUSAGE_ALL = (RESOURCEUSAGE_CONNECTABLE | RESOURCEUSAGE_CONTAINER | RESOURCEUSAGE_ATTACHED),
    }
    public enum RESOURCE_DISPLAYTYPE : uint
    {
        RESOURCEDISPLAYTYPE_GENERIC = 0x00000000,
        RESOURCEDISPLAYTYPE_DOMAIN = 0x00000001,
        RESOURCEDISPLAYTYPE_SERVER = 0x00000002,
        RESOURCEDISPLAYTYPE_SHARE = 0x00000003,
        RESOURCEDISPLAYTYPE_FILE = 0x00000004,
        RESOURCEDISPLAYTYPE_GROUP = 0x00000005,
        RESOURCEDISPLAYTYPE_NETWORK = 0x00000006,
        RESOURCEDISPLAYTYPE_ROOT = 0x00000007,
        RESOURCEDISPLAYTYPE_SHAREADMIN = 0x00000008,
        RESOURCEDISPLAYTYPE_DIRECTORY = 0x00000009,
        RESOURCEDISPLAYTYPE_TREE = 0x0000000A,
        RESOURCEDISPLAYTYPE_NDSCONTAINER = 0x0000000B
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct NetResource
    {
        public RESOURCE_SCOPE dwScope;
        public RESOURCE_TYPE dwType;
        public RESOURCE_DISPLAYTYPE dwDisplayType;
        public RESOURCE_USAGE dwUsage;
        [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)]
        public string lpLocalName;
        [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)]
        public string lpRemoteName;
        [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)]
        public string lpComment;
        [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)]
        public string lpProvider;
    }

    static System.Collections.Generic.Dictionary<string, NetResource> WNetResource(object resource)
    {
        System.Collections.Generic.Dictionary<string, NetResource> result = new System.Collections.Generic.Dictionary<string, NetResource>();

        int iRet;
        IntPtr ptrHandle = new IntPtr();
        try
        {
            iRet = WNetOpenEnum(
                RESOURCE_SCOPE.RESOURCE_REMEMBERED, RESOURCE_TYPE.RESOURCETYPE_DISK, RESOURCE_USAGE.RESOURCEUSAGE_ALL,
                resource, out ptrHandle);
            if (iRet != 0)
                return null;

            int entries = -1;
            int buffer = 16384;
            IntPtr ptrBuffer = Marshal.AllocHGlobal(buffer);
            NetResource nr;

            iRet = WNetEnumResource(ptrHandle, ref entries, ptrBuffer, ref buffer);
            while ((iRet == 0) || (entries > 0))
            {
                Int32 ptr = ptrBuffer.ToInt32();
                for (int i = 0; i < entries; i++)
                {
                    nr = (NetResource)Marshal.PtrToStructure(new IntPtr(ptr), typeof(NetResource));
                    if (RESOURCE_USAGE.RESOURCEUSAGE_CONTAINER == (nr.dwUsage
                        & RESOURCE_USAGE.RESOURCEUSAGE_CONTAINER))
                    {
                        //call recursively to get all entries in a container
                        WNetResource(nr);
                    }
                    ptr += Marshal.SizeOf(nr);
                    result.Add(nr.lpLocalName, nr);
                }

                entries = -1;
                buffer = 16384;
                iRet = WNetEnumResource(ptrHandle, ref entries, ptrBuffer, ref buffer);
            }

            Marshal.FreeHGlobal(ptrBuffer);
            iRet = WNetCloseEnum(ptrHandle);
        }
        catch (Exception)
        {
        }

        return result;
    }
    public static System.Collections.Generic.Dictionary<string, NetResource> WNetResource()
    {
        return WNetResource(null);
    }

你必须调用WNetResource(),然后你将获得驱动器列表。 (和蛋糕: - ))

答案 1 :(得分:5)

Environment.GetLogicalDrives()DriveInfo.GetDrives()都返回了我的所有联网驱动器。

您的应用程序是否以其他用户身份运行(例如asp.net网站)?如果是,是否实际为该用户映射了驱动器?您可能会发现驱动器已为您映射,但它们实际上并未针对您的应用程序运行的用户进行映射。