private static string ResolveReparsePoint(IntPtr ptr, string path)
{
NativeMethods.REPARSE_DATA_BUFFER buffer = (NativeMethods.REPARSE_DATA_BUFFER)
Marshal.PtrToStructure(ptr, typeof(NativeMethods.REPARSE_DATA_BUFFER));
//Check that this Reparse Point has a Microsoft Tag
if (((uint)buffer.ReparseTag & (1 << 31)) == 0)
{
//We can only handle Microsoft's reparse tags.
throw new ArgumentException("Unknown Reparse point type.");
}
//Then handle the tags
switch (buffer.ReparseTag)
{
case NativeMethods.REPARSE_DATA_TAG.IO_REPARSE_TAG_MOUNT_POINT:
return(ResolveReparsePointJunction((IntPtr)(ptr.ToInt64() + Marshal.SizeOf(buffer))));
case NativeMethods.REPARSE_DATA_TAG.IO_REPARSE_TAG_SYMLINK:
return(ResolveReparsePointSymlink((IntPtr)(ptr.ToInt64() + Marshal.SizeOf(buffer)),
path));
default:
throw new ArgumentException("Unsupported Reparse point type.");
}
}
public void RemoveJunction(string junctionPoint)
{
if (!Directory.Exists(junctionPoint) && !File.Exists(junctionPoint))
{
return;
}
// Open the junction point.
SafeFileHandle fileHandle = OpenReparsePoint(junctionPoint, NativeMethods.EFileAccess.GenericWrite);
// Setup reparse structure.
NativeMethods.REPARSE_DATA_BUFFER reparseDataBuffer = new NativeMethods.REPARSE_DATA_BUFFER
{
reparseTag = NativeMethods.IO_REPARSE_TAG_MOUNT_POINT,
reparseDataLength = 0,
pathBuffer = new byte[0x3FF0]
};
// Calculate buffer size and allocate.
int inBufferSize = Marshal.SizeOf(reparseDataBuffer);
IntPtr inBuffer = Marshal.AllocHGlobal(inBufferSize);
try
{
// Create the pointer.
Marshal.StructureToPtr(reparseDataBuffer, inBuffer, false);
// Delete the reparse point.
bool result = NativeMethods.DeviceIoControl(
fileHandle.DangerousGetHandle(),
NativeMethods.FSCTL_DELETE_REPARSE_POINT,
inBuffer, 8, IntPtr.Zero, 0, out int BytesReturned, IntPtr.Zero);
if (!result)
{
throw new Win32Exception("ERROR: Unable to delete reparse point.");
}
}
finally
{
fileHandle.Dispose();
Marshal.FreeHGlobal(inBuffer);
}
}
