/// <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 (var handle = OpenReparsePoint(junctionPoint, EFileAccess.GenericWrite))
{
var reparseDataBuffer = new REPARSE_DATA_BUFFER_MOUNT_POINT
{
ReparseTag = IO_REPARSE_TAG_MOUNT_POINT,
ReparseDataLength = 0,
PathBuffer = new byte[0x3ff0]
};
var inBufferSize = Marshal.SizeOf(reparseDataBuffer);
var inBuffer = Marshal.AllocHGlobal(inBufferSize);
try
{
Marshal.StructureToPtr(reparseDataBuffer, inBuffer, false);
int bytesReturned;
var 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>
/// 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))
{
Directory.CreateDirectory(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 (var handle = OpenReparsePoint(junctionPoint, EFileAccess.GenericWrite))
{
var targetDirBytes = Encoding.Unicode.GetBytes(NonInterpretedPathPrefix + Path.GetFullPath(targetDir));
var reparseDataBuffer = new Object();
//if(!isSymLink)
if (true)
{
reparseDataBuffer =
new REPARSE_DATA_BUFFER_MOUNT_POINT
{
ReparseTag = IO_REPARSE_TAG_MOUNT_POINT,
ReparseDataLength = (ushort)(targetDirBytes.Length + 12),
SubstituteNameOffset = 0,
SubstituteNameLength = (ushort)targetDirBytes.Length,
PrintNameOffset = (ushort)(targetDirBytes.Length + 2),
PrintNameLength = 0,
PathBuffer = new byte[0x3ff0]
};
Array.Copy(targetDirBytes, ((REPARSE_DATA_BUFFER_MOUNT_POINT)reparseDataBuffer).PathBuffer, targetDirBytes.Length);
}
/*
* else
* {
* reparseDataBuffer =
* new REPARSE_DATA_BUFFER_SYM_LINK
* {
* ReparseTag = IO_REPARSE_TAG_SYMLINK,
* ReparseDataLength = (ushort)(targetDirBytes.Length + 12),
* SubstituteNameOffset = 0,
* SubstituteNameLength = (ushort)targetDirBytes.Length,
* PrintNameOffset = (ushort)(targetDirBytes.Length + 2),
* PrintNameLength = 0,
* Flags = 0,
* PathBuffer = new byte[0x3ff0]
* };
* Array.Copy(targetDirBytes, ((REPARSE_DATA_BUFFER_SYM_LINK)reparseDataBuffer).PathBuffer, targetDirBytes.Length);
* }*/
var inBufferSize = Marshal.SizeOf(reparseDataBuffer);
var inBuffer = Marshal.AllocHGlobal(inBufferSize);
try
{
Marshal.StructureToPtr(reparseDataBuffer, inBuffer, false);
int bytesReturned;
var 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);
}
}
}
