@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: Returns the length in bytes of a valid SID !!!!C# Signature: [DllImport("advapi32.dll")] static extern uint GetLengthSid(IntPtr pSid); !!!!VB Signature Public Declare Function GetLengthSid Lib "advapi32.dll"( _ pSID As System.IntPtr _ ) As Integer !!!!User-Defined Types: None. !!!!Notes: If pSid points to an unamanged array of bytes containing a SID, this function determines the length of the SID (by the formula: 8 + 4 times the value of the second byte), which you need to know, for example, when copying the SID into a managed byte array. Consider also the use of CopySid instead of Marshal.Copy below. MSDN isn't clear if that is necessary or not, but better safe than sorry. !!!!Tips & Tricks: Please add some! !!!!Sample Code: public static byte[] GetSidFromString(string stringSid) { IntPtr pSid; if ( !ConvertStringSidToSid(stringSid, out pSid) ) Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error()); try { int length = (int) GetLengthSid(pSid); byte[] sid = new byte[length]; Marshal.Copy(pSid, sid, 0, length); return sid; } finally { LocalFree(pSid); } } !!!!Alternative Managed API: Do you know one? Please contribute it! Documentation: GetLengthSid@msdn on MSDN
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