给定DFS路径,我如何知道它当前以编程方式存在的活动路径。
例如,我有2个服务器共享为"\\Server1\Folder\"
和"\\Server2\Folder\"
并且它已打开DFS,因此可以在"\\DFS_Server\Folder\"
上访问它,我怎么知道当前的活动路径是什么"\\DFS_Server\Folder\"
已启用,无论是"\\Server1\Folder\"
还是"\\Server2\Folder\"
。
答案 0 :(得分:6)
如果我正确理解您的要求,那么还有一个似乎可以满足您需求的API:
// mscorlib (no additional assemblies needed)
using System.Runtime.InteropServices;
public static class Dfs
{
private enum NetDfsInfoLevel
{
DfsInfo1 = 1,
DfsInfo2 = 2,
DfsInfo3 = 3,
DfsInfo4 = 4,
DfsInfo5 = 5,
DfsInfo6 = 6,
DfsInfo7 = 7,
DfsInfo8 = 8,
DfsInfo9 = 9,
DfsInfo50 = 50,
DfsInfo100 = 100,
DfsInfo150 = 150,
}
[DllImport("netapi32.dll", SetLastError = true)]
private static extern int NetApiBufferFree(IntPtr buffer);
[DllImport("Netapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
private static extern int NetDfsGetInfo(
[MarshalAs(UnmanagedType.LPWStr)] string DfsEntryPath, // DFS entry path for the volume
[MarshalAs(UnmanagedType.LPWStr)] string ServerName, // This parameter is currently ignored and should be NULL
[MarshalAs(UnmanagedType.LPWStr)] string ShareName, // This parameter is currently ignored and should be NULL.
NetDfsInfoLevel Level, // Level of information requested
out IntPtr Buffer // API allocates and returns buffer with requested info
);
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
private struct DFS_INFO_3
{
[MarshalAs(UnmanagedType.LPWStr)]
public string EntryPath;
[MarshalAs(UnmanagedType.LPWStr)]
public string Comment;
public int State;
public int NumberOfStorages;
public IntPtr Storage;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
private struct DFS_STORAGE_INFO
{
public int State;
[MarshalAs(UnmanagedType.LPWStr)]
public string ServerName;
[MarshalAs(UnmanagedType.LPWStr)]
public string ShareName;
}
private static T GetStruct<T>(IntPtr buffer, int offset=0)where T:struct
{
T r = new T();
r = (T) Marshal.PtrToStructure(buffer + offset * Marshal.SizeOf(r), typeof(T));
return r;
}
public static string GetDfsInfo(string server)
{
string rval = null;
IntPtr b;
int r = NetDfsGetInfo(server, null, null, NetDfsInfoLevel.DfsInfo3, out b);
if(r != 0)
{
NetApiBufferFree(b);
// return passed string if not DFS
return rval;
}
DFS_INFO_3 sRes = GetStruct<DFS_INFO_3>(b);
if(sRes.NumberOfStorages > 0)
{
DFS_STORAGE_INFO sResInfo = GetStruct<DFS_STORAGE_INFO>(sRes.Storage);
rval = string.Concat(@"\\", sResInfo.ServerName, @"\", sResInfo.ShareName, @"\");
}
NetApiBufferFree(b);
return rval;
}
}
像这样使用:
string dfsPath = @"\\DFS_Server\Folder\";
string share = Dfs.GetDfsInfo(dfsPath)
有关API参考,请检查NetDfsGetInfo,DFS_INFO_3,DFS_STORAGE_INFO和NetApiBufferFree上的msdn。
答案 1 :(得分:4)
尝试这样的情况,其中sDFSPath是您要查询的路径,sHostServer是您要查询WMI的服务器,这可以是您上面提到的两台服务器中的任何一台。您甚至可以在第一台服务器上发生故障时生成更优雅的代码,然后在下一台服务器上查询WMI
public static ArrayList GetActiveServers(string sDFSPath, string sHostServer)
{
ArrayList sHostNames = new ArrayList();
ManagementPath oManagementPath = new ManagementPath();
oManagementPath.Server = sHostServer;
oManagementPath.NamespacePath = @"root\cimv2";
oManagementScope = new ManagementScope(oManagementPath);
oManagementScope.Connect();
SelectQuery oSelectQuery = new SelectQuery();
oSelectQuery.QueryString = @"SELECT * FROM Win32_DfsTarget WHERE LinkName LIKE '%" + sDFSPath.Replace("\\", "\\\\") + "%' and State = 1";
ManagementObjectSearcher oObjectSearcher = new ManagementObjectSearcher(oManagementScope, oSelectQuery);
ManagementObjectCollection oObjectCollection = oObjectSearcher.Get();
if (oObjectCollection.Count != 0)
{
foreach (ManagementObject oItem in oObjectCollection)
{
sHostNames.Add(oItem.Properties["ServerName"].Value.ToString());
}
}
return sHostNames;
}
希望它有意义
答案 2 :(得分:4)
谢谢你,你的提示很有用。但是我使用NetDfsGetClientInfo更成功。还意识到解析过程可能是递归的。我最终得到了至少2次递归调用以获得实际的物理UNC共享,这是我的榜样。
我不知道,怎么样
public static class DFS
{
#region Import
[DllImport("Netapi32.dll", EntryPoint = "NetApiBufferFree")]
public static extern uint NetApiBufferFree(IntPtr Buffer);
[DllImport("Netapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern int NetDfsGetInfo(
[MarshalAs(UnmanagedType.LPWStr)] string EntryPath,
[MarshalAs(UnmanagedType.LPWStr)] string ServerName,
[MarshalAs(UnmanagedType.LPWStr)] string ShareName,
int Level,
out IntPtr Buffer);
[DllImport("Netapi32.dll")]
public static extern int NetDfsGetClientInfo(
[MarshalAs(UnmanagedType.LPWStr)] string EntryPath,
[MarshalAs(UnmanagedType.LPWStr)] string ServerName,
[MarshalAs(UnmanagedType.LPWStr)] string ShareName,
int Level,
out IntPtr Buffer);
#endregion
#region Structures
public struct DFS_INFO_3
{
[MarshalAs(UnmanagedType.LPWStr)]
public string EntryPath;
[MarshalAs(UnmanagedType.LPWStr)]
public string Comment;
public UInt32 State;
public UInt32 NumberOfStorages;
public IntPtr Storages;
}
public struct DFS_STORAGE_INFO
{
public Int32 State;
[MarshalAs(UnmanagedType.LPWStr)]
public string ServerName;
[MarshalAs(UnmanagedType.LPWStr)]
public string ShareName;
}
#endregion
const int DFS_VOLUME_STATE_OK = 0x00000001;
const int DFS_VOLUME_STATE_ONLINE = 0x00000004;
const int DFS_STORAGE_STATE_ONLINE = 0x00000002;
const int DFS_STORAGE_STATE_ACTIVE = 0x00000004;
public static String GetSharePath(String DFSPath)
{
if (!String.IsNullOrEmpty(DFSPath))
{
IntPtr Buffer = IntPtr.Zero;
try
{
int Error = NetDfsGetClientInfo(DFSPath, null, null, 3, out Buffer);
if (Error == 0)
{
DFS_INFO_3 DFSInfo = (DFS_INFO_3)Marshal.PtrToStructure(Buffer, typeof(DFS_INFO_3));
if ((DFSInfo.State & DFS_VOLUME_STATE_OK) > 0)
{
String SubPath = DFSPath.Remove(0, 1 + DFSInfo.EntryPath.Length).TrimStart(new Char[] { '\\' });
for (int i = 0; i < DFSInfo.NumberOfStorages; i++)
{
IntPtr Storage = new IntPtr(DFSInfo.Storages.ToInt64() + i * Marshal.SizeOf(typeof(DFS_STORAGE_INFO)));
DFS_STORAGE_INFO StorageInfo = (DFS_STORAGE_INFO)Marshal.PtrToStructure(Storage, typeof(DFS_STORAGE_INFO));
if ((StorageInfo.State & DFS_STORAGE_STATE_ACTIVE) > 0)
{
if (String.IsNullOrEmpty(SubPath))
{
return String.Format(@"\\{0}\{1}", StorageInfo.ServerName, StorageInfo.ShareName);
}
else
{
return GetSharePath(String.Format(@"\\{0}\{1}\{2}", StorageInfo.ServerName, StorageInfo.ShareName, SubPath));
}
}
}
}
}
else if (Error == 2662)
return DFSPath;
}
finally
{
NetApiBufferFree(Buffer);
}
}
return null;
}
public static String GetShareName(String SharePath)
{
if (!String.IsNullOrEmpty(SharePath))
{
String[] Tokens = SharePath.Trim(new Char[] { '\\' }).Split(new Char[] { '\\' }, StringSplitOptions.RemoveEmptyEntries);
if (2 <= Tokens.Length)
return Tokens[1];
}
return null;
}
}