如何确定映射驱动器的实际路径？
因此，如果我在名为“Z”的计算机上有一个映射驱动器，我如何使用 .NET 来确定映射文件夹的计算机和路径？
代码可以假设它正在具有映射驱动器的计算机上运行。
我查看了
PathDirectoryFileInfo我也查找了现有的问题，但找不到我要找的内容。
我扩展了 ibram 的答案并创建了这个类（已根据评论反馈进行更新）。我可能已经过度记录了它，但它应该是不言自明的。
/// <summary>
/// A static class to help with resolving a mapped drive path to a UNC network path.
/// If a local drive path or a UNC network path are passed in, they will just be returned.
/// </summary>
/// <example>
/// using System;
/// using System.IO;
/// using System.Management; // Reference System.Management.dll
///
/// // Example/Test paths, these will need to be adjusted to match your environment.
/// string[] paths = new string[] {
/// @"Z:\ShareName\Sub-Folder",
/// @"\\ACME-FILE\ShareName\Sub-Folder",
/// @"\\ACME.COM\ShareName\Sub-Folder", // DFS
/// @"C:\Temp",
/// @"\\localhost\c$\temp",
/// @"\\workstation\Temp",
/// @"Z:", // Mapped drive pointing to \\workstation\Temp
/// @"C:\",
/// @"Temp",
/// @".\Temp",
/// @"..\Temp",
/// "",
/// " ",
/// null
/// };
///
/// foreach (var curPath in paths) {
/// try {
/// Console.WriteLine(string.Format("{0} = {1}",
/// curPath,
/// MappedDriveResolver.ResolveToUNC(curPath))
/// );
/// }
/// catch (Exception ex) {
/// Console.WriteLine(string.Format("{0} = {1}",
/// curPath,
/// ex.Message)
/// );
/// }
/// }
/// </example>
public static class MappedDriveResolver
{
/// <summary>
/// Resolves the given path to a full UNC path if the path is a mapped drive.
/// Otherwise, just returns the given path.
/// </summary>
/// <param name="path">The path to resolve.</param>
/// <returns></returns>
public static string ResolveToUNC(string path) {
if (String.IsNullOrWhiteSpace(path)) {
throw new ArgumentNullException("The path argument was null or whitespace.");
}
if (!Path.IsPathRooted(path)) {
throw new ArgumentException(
string.Format("The path '{0}' was not a rooted path and ResolveToUNC does not support relative paths.",
path)
);
}
// Is the path already in the UNC format?
if (path.StartsWith(@"\\")) {
return path;
}
string rootPath = ResolveToRootUNC(path);
if (path.StartsWith(rootPath)) {
return path; // Local drive, no resolving occurred
}
else {
return path.Replace(GetDriveLetter(path), rootPath);
}
}
/// <summary>
/// Resolves the given path to a root UNC path if the path is a mapped drive.
/// Otherwise, just returns the given path.
/// </summary>
/// <param name="path">The path to resolve.</param>
/// <returns></returns>
public static string ResolveToRootUNC(string path) {
if (String.IsNullOrWhiteSpace(path)) {
throw new ArgumentNullException("The path argument was null or whitespace.");
}
if (!Path.IsPathRooted(path)) {
throw new ArgumentException(
string.Format("The path '{0}' was not a rooted path and ResolveToRootUNC does not support relative paths.",
path)
);
}
if (path.StartsWith(@"\\")) {
return Directory.GetDirectoryRoot(path);
}
// Get just the drive letter for WMI call
string driveletter = GetDriveLetter(path);
// Query WMI if the drive letter is a network drive, and if so the UNC path for it
using (ManagementObject mo = new ManagementObject()) {
mo.Path = new ManagementPath(string.Format("Win32_LogicalDisk='{0}'", driveletter));
DriveType driveType = (DriveType)((uint)mo["DriveType"]);
string networkRoot = Convert.ToString(mo["ProviderName"]);
if (driveType == DriveType.Network) {
return networkRoot;
}
else {
return driveletter + Path.DirectorySeparatorChar;
}
}
}
/// <summary>
/// Checks if the given path is a network drive.
/// </summary>
/// <param name="path">The path to check.</param>
/// <returns></returns>
public static bool isNetworkDrive(string path) {
if (String.IsNullOrWhiteSpace(path)) {
throw new ArgumentNullException("The path argument was null or whitespace.");
}
if (!Path.IsPathRooted(path)) {
throw new ArgumentException(
string.Format("The path '{0}' was not a rooted path and ResolveToRootUNC does not support relative paths.",
path)
);
}
if (path.StartsWith(@"\\")) {
return true;
}
// Get just the drive letter for WMI call
string driveletter = GetDriveLetter(path);
// Query WMI if the drive letter is a network drive
using (ManagementObject mo = new ManagementObject()) {
mo.Path = new ManagementPath(string.Format("Win32_LogicalDisk='{0}'", driveletter));
DriveType driveType = (DriveType)((uint)mo["DriveType"]);
return driveType == DriveType.Network;
}
}
/// <summary>
/// Given a path will extract just the drive letter with volume separator.
/// </summary>
/// <param name="path"></param>
/// <returns>C:</returns>
public static string GetDriveLetter(string path) {
if (String.IsNullOrWhiteSpace(path)) {
throw new ArgumentNullException("The path argument was null or whitespace.");
}
if (!Path.IsPathRooted(path)) {
throw new ArgumentException(
string.Format("The path '{0}' was not a rooted path and GetDriveLetter does not support relative paths.",
path)
);
}
if (path.StartsWith(@"\\")) {
throw new ArgumentException("A UNC path was passed to GetDriveLetter");
}
return Directory.GetDirectoryRoot(path).Replace(Path.DirectorySeparatorChar.ToString(), "");
}
}
我不记得在哪里找到这个，但它可以工作没有 p/invoke。这是rerun之前发布的内容。
您需要引用System.Management.dll：
using System.IO;
using System.Management;
代码：
public void FindUNCPaths()
{
DriveInfo[] dis = DriveInfo.GetDrives();
foreach( DriveInfo di in dis )
{
if(di.DriveType == DriveType.Network)
{
DirectoryInfo dir = di.RootDirectory;
// "x:"
MessageBox.Show( GetUNCPath( dir.FullName.Substring( 0, 2 ) ) );
}
}
}
public string GetUNCPath(string path)
{
if(path.StartsWith(@"\\"))
{
return path;
}
ManagementObject mo = new ManagementObject();
mo.Path = new ManagementPath( String.Format( "Win32_LogicalDisk='{0}'", path ) );
// DriveType 4 = Network Drive
if(Convert.ToUInt32(mo["DriveType"]) == 4 )
{
return Convert.ToString(mo["ProviderName"]);
}
else
{
return path;
}
}
更新： 显式运行作为管理员将不会显示映射的驱动器。以下是对此行为的解释： https://stackoverflow.com/a/11268410/448100 （简而言之：管理员具有不同的用户上下文，因此无法访问普通用户的映射驱动器）
以下是一些代码示例：
所有的魔力都源自 Windows 函数：
[DllImport("mpr.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern int WNetGetConnection(
[MarshalAs(UnmanagedType.LPTStr)] string localName,
[MarshalAs(UnmanagedType.LPTStr)] StringBuilder remoteName,
ref int length);
调用示例：
var sb = new StringBuilder(512);
var size = sb.Capacity;
var error = Mpr.WNetGetConnection("Z:", sb, ref size);
if (error != 0)
throw new Win32Exception(error, "WNetGetConnection failed");
var networkpath = sb.ToString();
我为此编写了一个方法。如果它是映射驱动器，则返回 UNC 路径，否则返回未更改的路径。
public static string UNCPath(string path)
{
using (RegistryKey key = Registry.CurrentUser.OpenSubKey("Network\\" + path[0]))
{
if (key != null)
{
path = key.GetValue("RemotePath").ToString() + path.Remove(0, 2).ToString();
}
}
return path;
}
编辑
现在，即使已有 UNC 路径，您也可以使用该方法。如果给定 UNC 路径，上述版本的方法会引发异常。
public static string UNCPath(string path)
{
if (!path.StartsWith(@"\\"))
{
using (RegistryKey key = Registry.CurrentUser.OpenSubKey("Network\\" + path[0]))
{
if (key != null)
{
return key.GetValue("RemotePath").ToString() + path.Remove(0, 2).ToString();
}
}
}
return path;
}
我认为您可以使用注册表中“当前用户”配置单元中的“网络”键。 映射的驱动器在服务器上列出了它们的共享路径。
如果系统中没有映射驱动器，则“当前用户”Hive 中没有“网络”密钥。
现在，我正在使用这种方式，没有外部 dll 或其他任何东西。
QueryDosDevice 将驱动器号转换为其扩展的路径。
请注意，这将翻译所有驱动器号，而不仅仅是映射到网络连接的驱动器号。 您需要已经知道哪些是网络路径，或者解析输出以查看哪些是网络。
这是 VB 签名
Declare Function QueryDosDevice Lib "kernel32" Alias "QueryDosDeviceA" (
ByVal lpDeviceName As String,
ByVal lpTargetPath As String,
ByVal ucchMax As Integer) As Integer
还有 C# 的
[DllImport("kernel32.dll")]
static extern uint QueryDosDevice(string lpDeviceName, IntPtr lpTargetPath, uint ucchMax);
您可以使用 WMI 来询问计算机上的 Win32_LogicalDrive 集合。 这是如何使用脚本来完成此操作的示例。 将其更改为 C# 在其他地方已经得到很好的解释。
稍微修改了文章中的 VB.NET 代码：
Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim strComputer = "."
Dim objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")
Dim colDrives = objWMIService.ExecQuery("Select * From Win32_LogicalDisk Where DriveType = 4")
For Each objDrive In colDrives
Debug.WriteLine("Drive letter: " & objDrive.DeviceID)
Debug.WriteLine("Network path: " & objDrive.ProviderName)
Next
End Sub
End Class
由于我在 Vermis 答案下的评论中提到的关于类型初始值设定项异常的问题，我无法复制 ibram 或 Vermis' 答案。
相反，我发现我可以查询计算机上当前的所有驱动器，然后循环遍历它们，如下所示：
using System.IO; //For DirectoryNotFound exception.
using System.Management;
/// <summary>
/// Given a local mapped drive letter, determine if it is a network drive. If so, return the server share.
/// </summary>
/// <param name="mappedDrive"></param>
/// <returns>The server path that the drive maps to ~ "////XXXXXX//ZZZZ"</returns>
private string CheckUNCPath(string mappedDrive)
{
//Query to return all the local computer's drives.
//See http://msdn.microsoft.com/en-us/library/ms186146.aspx, or search "WMI Queries"
SelectQuery selectWMIQuery = new SelectQuery("Win32_LogicalDisk");
ManagementObjectSearcher driveSearcher = new ManagementObjectSearcher(selectWMIQuery);
//Soem variables to be used inside and out of the foreach.
ManagementPath path = null;
ManagementObject networkDrive = null;
bool found = false;
string serverName = null;
//Check each disk, determine if it is a network drive, and then return the real server path.
foreach (ManagementObject disk in driveSearcher.Get())
{
path = disk.Path;
if (path.ToString().Contains(mappedDrive))
{
networkDrive = new ManagementObject(path);
if (Convert.ToUInt32(networkDrive["DriveType"]) == 4)
{
serverName = Convert.ToString(networkDrive["ProviderName"]);
found = true;
break;
}
else
{
throw new DirectoryNotFoundException("The drive " + mappedDrive + " was found, but is not a network drive. Were your network drives mapped correctly?");
}
}
}
if (!found)
{
throw new DirectoryNotFoundException("The drive " + mappedDrive + " was not found. Were your network drives mapped correctly?");
}
else
{
return serverName;
}
}
这适用于 x64 Windows 7、.NET 4。如果您遇到上述异常，它应该可用。
我使用 MSDN 提供的内容和 ibram's 或 Vermis' 答案来完成此操作，尽管在 MSDN 上找到具体示例有点困难。使用的资源：
using System;
using System.Management;
class Query_SelectQuery
{
public static int Main(string[] args)
{
SelectQuery selectQuery = new
SelectQuery("Win32_LogicalDisk");
ManagementObjectSearcher searcher =
new ManagementObjectSearcher(selectQuery);
foreach (ManagementObject disk in searcher.Get())
{
Console.WriteLine(disk.ToString());
}
Console.ReadLine();
return 0;
}
}
与 ibram 的答案类似，但有一些修改：
public static String GetUNCPath(String path) {
path = path.TrimEnd('\\', '/') + Path.DirectorySeparatorChar;
DirectoryInfo d = new DirectoryInfo(path);
String root = d.Root.FullName.TrimEnd('\\');
if (!root.StartsWith(@"\\")) {
ManagementObject mo = new ManagementObject();
mo.Path = new ManagementPath(String.Format("Win32_LogicalDisk='{0}'", root));
// DriveType 4 = Network Drive
if (Convert.ToUInt32(mo["DriveType"]) == 4)
root = Convert.ToString(mo["ProviderName"]);
else
root = @"\\" + System.Net.Dns.GetHostName() + "\\" + root.TrimEnd(':') + "$\\";
}
return Recombine(root, d);
}
private static String Recombine(String root, DirectoryInfo d) {
Stack s = new Stack();
while (d.Parent != null) {
s.Push(d.Name);
d = d.Parent;
}
while (s.Count > 0) {
root = Path.Combine(root, (String) s.Pop());
}
return root;
}
似乎需要 P/Invoke：使用 C# 将映射的驱动器号转换为网络路径
这家伙构建了一个托管类来处理它：C# Map Network Drive (API)
您还可以使用 WMI Win32_LogicalDisk 来获取您需要的所有信息。 使用类中的 ProviderName 来获取 UNC 路径。
就 Windows 而言，需要的是调用
WNetGetConnection这篇post描述了如何获取映射到本地文件夹的驱动器的绝对路径？
例如，我有一个“c: est”文件夹和一个“x:”驱动器，这是 映射到 c: est。
我正在寻找一个函数，当我传入时它将返回“c: est” “×：”
答案是：
SUBST 使用 DefineDosDevice（XP 及更高版本）创建驱动器/路径 映射。 您可以使用 QueryDosDevice 来获取 SUBSTed 的路径 开车：
[DllImport("kernel32.dll")]
private static extern uint QueryDosDevice(string lpDeviceName, StringBuilder lpTargetPath, int ucchMax);
static String GetPhysicalPath(String path)
{
if (String.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
// Get the drive letter
string pathRoot = Path.GetPathRoot(path);
if(String.IsNullOrEmpty(pathRoot))
{
throw new ArgumentNullException("path");
}
string lpDeviceName = pathRoot.Replace("\\", "");
const String substPrefix = @"\??\";
StringBuilder lpTargetPath = new StringBuilder(260);
if (0 != QueryDosDevice(lpDeviceName, lpTargetPath, lpTargetPath.Capacity))
{
string result;
// If drive is substed, the result will be in the format of "\??\C:\RealPath\".
if (lpTargetPath..ToString().StartsWith(substPrefix))
{
// Strip the \??\ prefix.
string root = lpTargetPath.ToString().Remove(0, substPrefix.Length);
result = Path.Combine(root, path.Replace(Path.GetPathRoot(path), ""));
}
else
{
// TODO: deal with other types of mappings.
// if not SUBSTed, just assume it's not mapped.
result = path;
}
return result;
}
else
{
// TODO: error reporting
return null;
}
}
这是一个不关心是本地还是远程的解决方案
private string uncpath_check(string path)
{
string rval = path;
string driveprefix = path.Substring(0, 2);
string unc;
if (driveprefix != "\\")
{
ManagementObject mo = new ManagementObject();
try
{
mo.Path = new ManagementPath(String.Format("Win32_LogicalDisk='{0}'", driveprefix));
unc = (string)mo["ProviderName"];
rval = path.Replace(driveprefix, unc);
}
catch
{
throw;
}
}
if (rval == null)
{ rval = path; }
return rval;
}