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copied!<p>In Win32, call <a href="http://msdn.microsoft.com/en-us/library/aa446671.aspx" rel="noreferrer">GetTokenInformation</a>, passing a token handle and the <code>TokenUser</code> constant. It will fill in a <a href="http://msdn.microsoft.com/en-us/library/aa379634.aspx" rel="noreferrer">TOKEN_USER</a> structure for you. One of the elements in there is the user's SID. It's a BLOB (binary), but you can turn it into a string by using <a href="http://msdn.microsoft.com/en-us/library/aa376399.aspx" rel="noreferrer">ConvertSidToStringSid</a>.</p> <p>To get hold of the current token handle, use <a href="http://msdn.microsoft.com/en-us/library/aa379296(VS.85).aspx" rel="noreferrer">OpenThreadToken</a> or <a href="http://msdn.microsoft.com/en-us/library/aa379295(VS.85).aspx" rel="noreferrer">OpenProcessToken</a>.</p> <p>If you prefer ATL, it has the <a href="http://msdn.microsoft.com/en-us/library/f42z4h7d(VS.80).aspx" rel="noreferrer">CAccessToken</a> class, which has all sorts of interesting things in it.</p> <p>.NET has the <a href="http://msdn.microsoft.com/en-us/library/system.threading.thread.currentprincipal.aspx" rel="noreferrer">Thread.CurrentPrinciple</a> property, which returns an IPrincipal reference. You can get the SID:</p> <pre><code>IPrincipal principal = Thread.CurrentPrincipal; WindowsIdentity identity = principal.Identity as WindowsIdentity; if (identity != null) Console.WriteLine(identity.User); </code></pre> <p>Also in .NET, you can use WindowsIdentity.GetCurrent(), which returns the current user ID:</p> <pre><code>WindowsIdentity identity = WindowsIdentity.GetCurrent(); if (identity != null) Console.WriteLine(identity.User); </code></pre>

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