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9882819
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0
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3
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2012-03-27T03:02:49.510
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2016-05-11T15:05:24.707
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2016-05-11T15:05:24.707
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1563422
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2
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I have some <a href="http://troyparsons.com/blog/2012/03/symbolic-links-in-c-sharp/" rel="noreferrer">source code for symlinks posted on my blog</a> that will allow you to: <ul> <li>create symlinks</li> <li>check whether a path is a symlink</li> <li>retrieve the target of a symlink</li> </ul> It also contains NUnit test cases, that you may wish to extend. The meaty bit is: <pre><code>private static SafeFileHandle getFileHandle(string path) { return CreateFile(path, genericReadAccess, shareModeAll, IntPtr.Zero, openExisting, fileFlagsForOpenReparsePointAndBackupSemantics, IntPtr.Zero); } public static string GetTarget(string path) { SymbolicLinkReparseData reparseDataBuffer; using (SafeFileHandle fileHandle = getFileHandle(path)) { if (fileHandle.IsInvalid) { Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error()); } int outBufferSize = Marshal.SizeOf(typeof(SymbolicLinkReparseData)); IntPtr outBuffer = IntPtr.Zero; try { outBuffer = Marshal.AllocHGlobal(outBufferSize); int bytesReturned; bool success = DeviceIoControl( fileHandle.DangerousGetHandle(), ioctlCommandGetReparsePoint, IntPtr.Zero, 0, outBuffer, outBufferSize, out bytesReturned, IntPtr.Zero); fileHandle.Close(); if (!success) { if (((uint)Marshal.GetHRForLastWin32Error()) == pathNotAReparsePointError) { return null; } Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error()); } reparseDataBuffer = (SymbolicLinkReparseData)Marshal.PtrToStructure( outBuffer, typeof(SymbolicLinkReparseData)); } finally { Marshal.FreeHGlobal(outBuffer); } } if (reparseDataBuffer.ReparseTag != symLinkTag) { return null; } string target = Encoding.Unicode.GetString(reparseDataBuffer.PathBuffer, reparseDataBuffer.PrintNameOffset, reparseDataBuffer.PrintNameLength); return target; } </code></pre> That is: <ul> <li>Open the file with <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa363858%28v=vs.85%29.aspx" rel="noreferrer"><code>CreateFile()</code></a></li> <li>Call <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa363216%28v=vs.85%29.aspx" rel="noreferrer"><code>DeviceIoControl()</code></a> to get the reparse point data (NOTE: it could be a junction point!)</li> <li>Check out the <a href="http://msdn.microsoft.com/en-us/library/windows/hardware/ff552012%28v=vs.85%29.aspx" rel="noreferrer">returned data structure</a> to inspect. The <a href="http://msdn.microsoft.com/en-us/library/dd541667%28v=prot.10%29.aspx" rel="noreferrer">reparse tag</a> will tell you if it is a junction point or symbolic link. This may be all you want to do.</li> </ul>
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1. POCheck if a file is real or a symbolic link
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1. USDanny Beckett
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1. USTroy Parsons
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