@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The SetNamedSecurityInfo function sets specified security information in the security descriptor of a specified object. The caller identifies the object by name !!!!C# Signature: [DllImport("advapi32.dll", CharSet=CharSet.Auto)] static extern uint SetNamedSecurityInfo( string pObjectName, SE_OBJECT_TYPE ObjectType, SECURITY_INFORMATION SecurityInfo, IntPtr psidOwner, IntPtr psidGroup, IntPtr pDacl, IntPtr pSacl); !!!!VB Signature: Declare Function SetNamedSecurityInfo Lib "advapi32.dll" ( _ ByVal pObjectName As String, _ ByVal ObjectType As SE_OBJECT_TYPE, _ ByVal SecurityInfo As SECURITY_INFORMATION, _ ByVal psidOwner As IntPtr, _ ByVal psidGroup As IntPtr, _ ByVal pDacl As IntPtr, _ ByVal pSacl As IntPtr) As Integer !!!!User-Defined Types: [SE_OBJECT_TYPE], [SECURITY_INFORMATION] !!!!Notes: !!!!Tips & Tricks: Please add some! !!!!C# Sample Code: [DllImport("advapi32.dll", CharSet = CharSet.Unicode)] private static extern uint SetNamedSecurityInfoW(String pObjectName, SE_OBJECT_TYPE ObjectType, SECURITY_INFORMATION SecurityInfo, IntPtr psidOwner, IntPtr psidGroup, IntPtr pDacl, IntPtr pSacl); [DllImport("Advapi32.dll", SetLastError = true)] private static extern bool ConvertStringSidToSid(String StringSid, ref IntPtr Sid); private enum SE_OBJECT_TYPE { SE_UNKNOWN_OBJECT_TYPE=0, SE_FILE_OBJECT, SE_SERVICE, SE_PRINTER, SE_REGISTRY_KEY, SE_LMSHARE, SE_KERNEL_OBJECT, SE_WINDOW_OBJECT, SE_DS_OBJECT, SE_DS_OBJECT_ALL, SE_PROVIDER_DEFINED_OBJECT, SE_WMIGUID_OBJECT,S E_REGISTRY_WOW64_32KEY } [Flags] private enum SECURITY_INFORMATION : uint { Owner = 0x00000001, Group = 0x00000002, Dacl = 0x00000004, Sacl = 0x00000008, ProtectedDacl = 0x80000000, ProtectedSacl = 0x40000000, UnprotectedDacl = 0x20000000, UnprotectedSacl = 0x10000000 } public static void SetFileOrFolderOwner(String objectName) //Note this is very basic and is silent on fail as I havent checked GetlastError and thrown an exception etc { IntPtr sidPtr = IntPtr.Zero; SECURITY_INFORMATION sFlags = SECURITY_INFORMATION.Owner; System.Security.Principal.NTAccount user = new System.Security.Principal.NTAccount("P1R4T3\\Harris"); System.Security.Principal.SecurityIdentifier sid = (System.Security.Principal.SecurityIdentifier) user.Translate(typeof (System.Security.Principal.SecurityIdentifier)); ConvertStringSidToSid(sid.ToString(), ref sidPtr); SetNamedSecurityInfoW(UnicodeHeader+objectName, SE_OBJECT_TYPE.SE_FILE_OBJECT, sFlags,sidPtr , IntPtr.Zero, IntPtr.Zero, IntPtr.Zero); //Probably should release the IntPtr here to avoid memory leakage????? } !!!!VB.Net Sample Code: Dim pSecDesc, pNewDACL, pOldDACL As IntPtr Dim ea As EXPLICIT_ACCESS Dim Win32Error As Win32Exception Dim ret As Integer ' merge this Explict Access with the existing DACL ret = SetEntriesInAcl(1, ea, pOldDACL, pNewDACL) If ret <> 0 Then Win32Error = New Win32Exception(ret) Throw New Exception(Win32Error.Message) End If ' write the new Security Descriptor/DACL back ret = SetNamedSecurityInfo(strPath, _ SE_OBJECT_TYPE.SE_FILE_OBJECT, _ SECURITY_INFORMATION.DACL_SECURITY_INFORMATION, _ Nothing, Nothing, pNewDACL, Nothing) If ret <> 0 Then Win32Error = New Win32Exception(ret) Throw New Exception(Win32Error.Message) End If !!!!Alternative Managed API: Do you know one? Please contribute it! Documentation: SetNamedSecurityInfo@msdn on MSDN
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