@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: TODO - a short description !!!!C# Signature: [DllImport("advapi32.dll", SetLastError=true)] static extern bool IsValidSid([MarshalAs(UnmanagedType.LPArray)] byte[] pSid); !!!!VB Signature: Declare Function IsValidSid Lib "advapi32.dll" (TODO) As TODO !!!!User-Defined Types: None. !!!!Alternative Managed API: Do you know one? Please contribute it! !!!!Notes: None. !!!!Tips & Tricks: Please add some! !!!!Sample Code: class Program { const int NO_ERROR = 0; const int ERROR_INSUFFICIENT_BUFFER = 122; const int ERROR_INVALID_FLAGS = 1004; // On Windows Server 2003 this error is/can be returned, but processing can still continue enum SID_NAME_USE { SidTypeUser = 1, SidTypeGroup, SidTypeDomain, SidTypeAlias, SidTypeWellKnownGroup, SidTypeDeletedAccount, SidTypeInvalid, SidTypeUnknown, SidTypeComputer } [DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)] static extern bool LookupAccountName( string lpSystemName, string lpAccountName, [MarshalAs(UnmanagedType.LPArray)] byte[] Sid, ref uint cbSid, StringBuilder ReferencedDomainName, ref uint cchReferencedDomainName, out SID_NAME_USE peUse); [DllImport("advapi32", CharSet = CharSet.Auto, SetLastError = true)] static extern bool ConvertSidToStringSid( [MarshalAs(UnmanagedType.LPArray)] byte[] pSID, out IntPtr ptrSid); [DllImport("kernel32.dll")] static extern IntPtr LocalFree(IntPtr hMem); [DllImport("advapi32.dll", SetLastError = true)] static extern bool IsValidSid([MarshalAs(UnmanagedType.LPArray)] byte[] pSid); static void Main(string[] args) { string accountName = "user1"; byte [] Sid = null; uint cbSid = 0; StringBuilder referencedDomainName = new StringBuilder(); uint cchReferencedDomainName = (uint)referencedDomainName.Capacity; SID_NAME_USE sidUse; int err = NO_ERROR; if (!LookupAccountName(null,accountName,Sid,ref cbSid,referencedDomainName,ref cchReferencedDomainName,out sidUse)) { err = Marshal.GetLastWin32Error(); if (err == ERROR_INSUFFICIENT_BUFFER || err == ERROR_INVALID_FLAGS) { Sid = new byte[cbSid]; referencedDomainName.EnsureCapacity((int)cchReferencedDomainName); err = NO_ERROR; if (!LookupAccountName(null,accountName,Sid,ref cbSid,referencedDomainName,ref cchReferencedDomainName,out sidUse)) err = Marshal.GetLastWin32Error(); } } else { // Consider throwing an exception since no result was found } if (err == 0) { if (IsValidSid(Sid)) { Console.WriteLine("SID is a valid SID.."); } else { Console.WriteLine("SID is an unvalid SID.."); } IntPtr ptrSid; if (!ConvertSidToStringSid(Sid,out ptrSid)) { err = Marshal.GetLastWin32Error(); Console.WriteLine(@"Could not convert sid to string. Error : {0}",err); } else { string sidString = Marshal.PtrToStringAuto(ptrSid); LocalFree(ptrSid); Console.WriteLine(@"Found sid {0} : {1}",sidUse,sidString); } } else Console.WriteLine(@"Error : {0}",err); } } Documentation: IsValidSid@msdn on MSDN
Edit advapi32.IsValidSid
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