في .NET ، كيف أقوم بإنشاء تقاطع في NTFS ، بدلاً من الارتباط؟
https://stackoverflow.com/questions/1400549
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05-07-2019 - |
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أحاول إنشاء تقاطع NTFS. من خط CMD يمكنني القيام بذلك باستخدام أداة Junction.exe من sysinternals. يبدو أن إخراج DIR CMD لتقاطعه مثل هذا:
Volume in drive C has no label.
Volume Serial Number is C8BC-2EBD
Directory of c:\users\cheeso\Documents
03/22/2009 09:45 PM <JUNCTION> My Music [\??\c:\users\cheeso\Music]
05/11/2007 05:42 PM <DIR> My Received Files
03/22/2009 09:46 PM <JUNCTION> my videos [\??\c:\users\cheeso\Videos]
قرأت في مكان ما أن الوصلات هي مجموعة فرعية من الروابط الرمزية.
لذلك حاولت استخدام CreateSymbolicLink لإنشاء تقاطع. عندما أفعل هذا ، أحصل في الواقع على Symlink ، وليس تقاطع.
09/09/2009 11:50 AM <SYMLINKD> newLink [.\]
يوجد ايضا CreateHardLink. يقول المستند هناك إن الوصلات (المعروفة أيضًا باسم "النقاط المحترمة") هي مجموعة فرعية من الروابط الصلبة. لكن لا يمكنني الحصول على هذه الدعوة للعمل. يكمل ولكن لا يوجد صلة الصلابة أو تقاطع.
أنا أستخدم .NET/C# ويبدو الواردات هكذا:
[Interop.DllImport("kernel32.dll", EntryPoint="CreateSymbolicLinkW", CharSet=Interop.CharSet.Unicode)]
public static extern int CreateSymbolicLink(string lpSymlinkFileName, string lpTargetFileName, int dwFlags);
[Interop.DllImport("kernel32.dll", EntryPoint="CreateHardLinkW", CharSet=Interop.CharSet.Unicode)]
public static extern bool CreateHardLink(string lpFileName,
string lpExistingFileName,
IntPtr mustBeNull);
ما الخطأ الذي افعله؟
كيف يمكنني إنشاء تقاطع من داخل C#؟
المحلول
يبدو أنك تستطيع ذلك ، وأنشأ شخص ما مكتبة على CodeProject التي تحتوي على عدد من الوظائف التي قاموا ببنائها في C# للعمل مع نقاط التقاطع.
http://www.codeproject.com/kb/files/junctionpointsnet.aspx
يبدو أنه يستخدم بالفعل Dllimport التالي لإنجازه:
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool DeviceIoControl(IntPtr hDevice, uint dwIoControlCode,
IntPtr InBuffer, int nInBufferSize,
IntPtr OutBuffer, int nOutBufferSize,
out int pBytesReturned, IntPtr lpOverlapped);
نصائح أخرى
الرمز من http://www.codeproject.com/kb/files/junctionpointsnet.aspx كاختصار لأولئك الذين لا يمكنهم الوصول إلى هذا الرابط أو نسخة احتياطية في حالة انخفاض الصفحة الأصلية.
لا تصوت هذا الرد ، لأنني لست مؤلفًا عن هذا الرمز.
بفضل المؤلف الأصلي جيفcodeproject.
using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using Microsoft.Win32.SafeHandles;
namespace Monitor.Core.Utilities
{
/// <summary>
/// Provides access to NTFS junction points in .Net.
/// </summary>
public static class JunctionPoint
{
/// <summary>
/// The file or directory is not a reparse point.
/// </summary>
private const int ERROR_NOT_A_REPARSE_POINT = 4390;
/// <summary>
/// The reparse point attribute cannot be set because it conflicts with an existing attribute.
/// </summary>
private const int ERROR_REPARSE_ATTRIBUTE_CONFLICT = 4391;
/// <summary>
/// The data present in the reparse point buffer is invalid.
/// </summary>
private const int ERROR_INVALID_REPARSE_DATA = 4392;
/// <summary>
/// The tag present in the reparse point buffer is invalid.
/// </summary>
private const int ERROR_REPARSE_TAG_INVALID = 4393;
/// <summary>
/// There is a mismatch between the tag specified in the request and the tag present in the reparse point.
/// </summary>
private const int ERROR_REPARSE_TAG_MISMATCH = 4394;
/// <summary>
/// Command to set the reparse point data block.
/// </summary>
private const int FSCTL_SET_REPARSE_POINT = 0x000900A4;
/// <summary>
/// Command to get the reparse point data block.
/// </summary>
private const int FSCTL_GET_REPARSE_POINT = 0x000900A8;
/// <summary>
/// Command to delete the reparse point data base.
/// </summary>
private const int FSCTL_DELETE_REPARSE_POINT = 0x000900AC;
/// <summary>
/// Reparse point tag used to identify mount points and junction points.
/// </summary>
private const uint IO_REPARSE_TAG_MOUNT_POINT = 0xA0000003;
/// <summary>
/// This prefix indicates to NTFS that the path is to be treated as a non-interpreted
/// path in the virtual file system.
/// </summary>
private const string NonInterpretedPathPrefix = @"\??\";
[Flags]
private enum EFileAccess : uint
{
GenericRead = 0x80000000,
GenericWrite = 0x40000000,
GenericExecute = 0x20000000,
GenericAll = 0x10000000,
}
[Flags]
private enum EFileShare : uint
{
None = 0x00000000,
Read = 0x00000001,
Write = 0x00000002,
Delete = 0x00000004,
}
private enum ECreationDisposition : uint
{
New = 1,
CreateAlways = 2,
OpenExisting = 3,
OpenAlways = 4,
TruncateExisting = 5,
}
[Flags]
private enum EFileAttributes : uint
{
Readonly = 0x00000001,
Hidden = 0x00000002,
System = 0x00000004,
Directory = 0x00000010,
Archive = 0x00000020,
Device = 0x00000040,
Normal = 0x00000080,
Temporary = 0x00000100,
SparseFile = 0x00000200,
ReparsePoint = 0x00000400,
Compressed = 0x00000800,
Offline = 0x00001000,
NotContentIndexed = 0x00002000,
Encrypted = 0x00004000,
Write_Through = 0x80000000,
Overlapped = 0x40000000,
NoBuffering = 0x20000000,
RandomAccess = 0x10000000,
SequentialScan = 0x08000000,
DeleteOnClose = 0x04000000,
BackupSemantics = 0x02000000,
PosixSemantics = 0x01000000,
OpenReparsePoint = 0x00200000,
OpenNoRecall = 0x00100000,
FirstPipeInstance = 0x00080000
}
[StructLayout(LayoutKind.Sequential)]
private struct REPARSE_DATA_BUFFER
{
/// <summary>
/// Reparse point tag. Must be a Microsoft reparse point tag.
/// </summary>
public uint ReparseTag;
/// <summary>
/// Size, in bytes, of the data after the Reserved member. This can be calculated by:
/// (4 * sizeof(ushort)) + SubstituteNameLength + PrintNameLength +
/// (namesAreNullTerminated ? 2 * sizeof(char) : 0);
/// </summary>
public ushort ReparseDataLength;
/// <summary>
/// Reserved; do not use.
/// </summary>
public ushort Reserved;
/// <summary>
/// Offset, in bytes, of the substitute name string in the PathBuffer array.
/// </summary>
public ushort SubstituteNameOffset;
/// <summary>
/// Length, in bytes, of the substitute name string. If this string is null-terminated,
/// SubstituteNameLength does not include space for the null character.
/// </summary>
public ushort SubstituteNameLength;
/// <summary>
/// Offset, in bytes, of the print name string in the PathBuffer array.
/// </summary>
public ushort PrintNameOffset;
/// <summary>
/// Length, in bytes, of the print name string. If this string is null-terminated,
/// PrintNameLength does not include space for the null character.
/// </summary>
public ushort PrintNameLength;
/// <summary>
/// A buffer containing the unicode-encoded path string. The path string contains
/// the substitute name string and print name string.
/// </summary>
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 0x3FF0)]
public byte[] PathBuffer;
}
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool DeviceIoControl(IntPtr hDevice, uint dwIoControlCode,
IntPtr InBuffer, int nInBufferSize,
IntPtr OutBuffer, int nOutBufferSize,
out int pBytesReturned, IntPtr lpOverlapped);
[DllImport("kernel32.dll", SetLastError = true)]
private static extern IntPtr CreateFile(
string lpFileName,
EFileAccess dwDesiredAccess,
EFileShare dwShareMode,
IntPtr lpSecurityAttributes,
ECreationDisposition dwCreationDisposition,
EFileAttributes dwFlagsAndAttributes,
IntPtr hTemplateFile);
/// <summary>
/// Creates a junction point from the specified directory to the specified target directory.
/// </summary>
/// <remarks>
/// Only works on NTFS.
/// </remarks>
/// <param name="junctionPoint">The junction point path</param>
/// <param name="targetDir">The target directory</param>
/// <param name="overwrite">If true overwrites an existing reparse point or empty directory</param>
/// <exception cref="IOException">Thrown when the junction point could not be created or when
/// an existing directory was found and <paramref name="overwrite" /> if false</exception>
public static void Create(string junctionPoint, string targetDir, bool overwrite)
{
targetDir = Path.GetFullPath(targetDir);
if (!Directory.Exists(targetDir))
throw new IOException("Target path does not exist or is not a directory.");
if (Directory.Exists(junctionPoint))
{
if (!overwrite)
throw new IOException("Directory already exists and overwrite parameter is false.");
}
else
{
Directory.CreateDirectory(junctionPoint);
}
using (SafeFileHandle handle = OpenReparsePoint(junctionPoint, EFileAccess.GenericWrite))
{
byte[] targetDirBytes = Encoding.Unicode.GetBytes(NonInterpretedPathPrefix + Path.GetFullPath(targetDir));
REPARSE_DATA_BUFFER reparseDataBuffer = new REPARSE_DATA_BUFFER();
reparseDataBuffer.ReparseTag = IO_REPARSE_TAG_MOUNT_POINT;
reparseDataBuffer.ReparseDataLength = (ushort)(targetDirBytes.Length + 12);
reparseDataBuffer.SubstituteNameOffset = 0;
reparseDataBuffer.SubstituteNameLength = (ushort)targetDirBytes.Length;
reparseDataBuffer.PrintNameOffset = (ushort)(targetDirBytes.Length + 2);
reparseDataBuffer.PrintNameLength = 0;
reparseDataBuffer.PathBuffer = new byte[0x3ff0];
Array.Copy(targetDirBytes, reparseDataBuffer.PathBuffer, targetDirBytes.Length);
int inBufferSize = Marshal.SizeOf(reparseDataBuffer);
IntPtr inBuffer = Marshal.AllocHGlobal(inBufferSize);
try
{
Marshal.StructureToPtr(reparseDataBuffer, inBuffer, false);
int bytesReturned;
bool result = DeviceIoControl(handle.DangerousGetHandle(), FSCTL_SET_REPARSE_POINT,
inBuffer, targetDirBytes.Length + 20, IntPtr.Zero, 0, out bytesReturned, IntPtr.Zero);
if (!result)
ThrowLastWin32Error("Unable to create junction point.");
}
finally
{
Marshal.FreeHGlobal(inBuffer);
}
}
}
/// <summary>
/// Deletes a junction point at the specified source directory along with the directory itself.
/// Does nothing if the junction point does not exist.
/// </summary>
/// <remarks>
/// Only works on NTFS.
/// </remarks>
/// <param name="junctionPoint">The junction point path</param>
public static void Delete(string junctionPoint)
{
if (!Directory.Exists(junctionPoint))
{
if (File.Exists(junctionPoint))
throw new IOException("Path is not a junction point.");
return;
}
using (SafeFileHandle handle = OpenReparsePoint(junctionPoint, EFileAccess.GenericWrite))
{
REPARSE_DATA_BUFFER reparseDataBuffer = new REPARSE_DATA_BUFFER();
reparseDataBuffer.ReparseTag = IO_REPARSE_TAG_MOUNT_POINT;
reparseDataBuffer.ReparseDataLength = 0;
reparseDataBuffer.PathBuffer = new byte[0x3ff0];
int inBufferSize = Marshal.SizeOf(reparseDataBuffer);
IntPtr inBuffer = Marshal.AllocHGlobal(inBufferSize);
try
{
Marshal.StructureToPtr(reparseDataBuffer, inBuffer, false);
int bytesReturned;
bool result = DeviceIoControl(handle.DangerousGetHandle(), FSCTL_DELETE_REPARSE_POINT,
inBuffer, 8, IntPtr.Zero, 0, out bytesReturned, IntPtr.Zero);
if (!result)
ThrowLastWin32Error("Unable to delete junction point.");
}
finally
{
Marshal.FreeHGlobal(inBuffer);
}
try
{
Directory.Delete(junctionPoint);
}
catch (IOException ex)
{
throw new IOException("Unable to delete junction point.", ex);
}
}
}
/// <summary>
/// Determines whether the specified path exists and refers to a junction point.
/// </summary>
/// <param name="path">The junction point path</param>
/// <returns>True if the specified path represents a junction point</returns>
/// <exception cref="IOException">Thrown if the specified path is invalid
/// or some other error occurs</exception>
public static bool Exists(string path)
{
if (! Directory.Exists(path))
return false;
using (SafeFileHandle handle = OpenReparsePoint(path, EFileAccess.GenericRead))
{
string target = InternalGetTarget(handle);
return target != null;
}
}
/// <summary>
/// Gets the target of the specified junction point.
/// </summary>
/// <remarks>
/// Only works on NTFS.
/// </remarks>
/// <param name="junctionPoint">The junction point path</param>
/// <returns>The target of the junction point</returns>
/// <exception cref="IOException">Thrown when the specified path does not
/// exist, is invalid, is not a junction point, or some other error occurs</exception>
public static string GetTarget(string junctionPoint)
{
using (SafeFileHandle handle = OpenReparsePoint(junctionPoint, EFileAccess.GenericRead))
{
string target = InternalGetTarget(handle);
if (target == null)
throw new IOException("Path is not a junction point.");
return target;
}
}
private static string InternalGetTarget(SafeFileHandle handle)
{
int outBufferSize = Marshal.SizeOf(typeof(REPARSE_DATA_BUFFER));
IntPtr outBuffer = Marshal.AllocHGlobal(outBufferSize);
try
{
int bytesReturned;
bool result = DeviceIoControl(handle.DangerousGetHandle(), FSCTL_GET_REPARSE_POINT,
IntPtr.Zero, 0, outBuffer, outBufferSize, out bytesReturned, IntPtr.Zero);
if (!result)
{
int error = Marshal.GetLastWin32Error();
if (error == ERROR_NOT_A_REPARSE_POINT)
return null;
ThrowLastWin32Error("Unable to get information about junction point.");
}
REPARSE_DATA_BUFFER reparseDataBuffer = (REPARSE_DATA_BUFFER)
Marshal.PtrToStructure(outBuffer, typeof(REPARSE_DATA_BUFFER));
if (reparseDataBuffer.ReparseTag != IO_REPARSE_TAG_MOUNT_POINT)
return null;
string targetDir = Encoding.Unicode.GetString(reparseDataBuffer.PathBuffer,
reparseDataBuffer.SubstituteNameOffset, reparseDataBuffer.SubstituteNameLength);
if (targetDir.StartsWith(NonInterpretedPathPrefix))
targetDir = targetDir.Substring(NonInterpretedPathPrefix.Length);
return targetDir;
}
finally
{
Marshal.FreeHGlobal(outBuffer);
}
}
private static SafeFileHandle OpenReparsePoint(string reparsePoint, EFileAccess accessMode)
{
SafeFileHandle reparsePointHandle = new SafeFileHandle(CreateFile(reparsePoint, accessMode,
EFileShare.Read | EFileShare.Write | EFileShare.Delete,
IntPtr.Zero, ECreationDisposition.OpenExisting,
EFileAttributes.BackupSemantics | EFileAttributes.OpenReparsePoint, IntPtr.Zero), true);
if (Marshal.GetLastWin32Error() != 0)
ThrowLastWin32Error("Unable to open reparse point.");
return reparsePointHandle;
}
private static void ThrowLastWin32Error(string message)
{
throw new IOException(message, Marshal.GetExceptionForHR(Marshal.GetHRForLastWin32Error()));
}
}
}
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