NtQuerySymbolicLinkObject

C# Signature:

[DllImport("ntdll.dll")]
public static extern int NtQuerySymbolicLinkObject(
   SafeFileHandle LinkHandle,
   ref UNICODE_STRING LinkTarget,
   out int ReturnedLength);

Tips & Tricks:

int len;
var buffer = new UNICODE_STRING(new string(' ', 512));
NtQuerySymbolicLinkObject(h, ref buffer, out len);
Debug.WriteLine(buffer.ToString());