C# Signature:

[DllImport("advapi32.dll", SetLastError=true)]
static extern bool ConvertStringSidToSid(
            string StringSid,
            out IntPtr ptrSid
            );

VB Signature:

    Private Declare Auto Function ConvertStringSidToSid Lib "advapi32.dll" (StringSid As String, ByRef ptrSid As IntPtr) As Boolean

User-Defined Types:

None.

Notes:

Dispose of the sid pointer using Marshal.FreeHGlobal() to avoid a memory leak

Tips & Tricks:

Please add some!

C#.Net Sample Code:

public void CopyFolderPermissions(string FromPath, string ToPath)

{

    ManagementBaseObject Descriptor = null;
    ManagementObjectCollection UserSearch = new ManagementObjectSearcher("Select * From Win32_LogicalFileSecuritySetting Where Path='" + FromPath + "'").Get();
    try
    {
        foreach(ManagementObject UserObject in UserSearch)
        {
            ManagementBaseObject inParams1 = UserObject.GetMethodParameters("GetSecurityDescriptor");
            ManagementBaseObject outParams1 = UserObject.InvokeMethod("GetSecurityDescriptor", inParams1, null);
            Descriptor = ((ManagementBaseObject)(outParams1.Properties["Descriptor"].Value));
        }
    }
    catch (Exception se)
    {
        Trace.WriteLine(se.Message);
    }

    ManagementObject Share = new ManagementObject("Win32_Directory='" + ToPath + "'");
    ManagementBaseObject inParams = Share.GetMethodParameters("ChangeSecurityPermissions");

    inParams["Option"] = 4;
    inParams["SecurityDescriptor"] = Descriptor;

    ManagementBaseObject outParams = Share.InvokeMethod("ChangeSecurityPermissions", inParams, null);

}

internal class Win32_Ace

{

    [DllImport("advapi32.dll", SetLastError=true)]
    static extern bool ConvertStringSidToSid(
        string lbBuffer,
        out IntPtr ptrSid);

    [DllImport("advapi32.dll", EntryPoint = "GetLengthSid", CharSet = CharSet.Auto)]
    static extern int GetLengthSid(IntPtr pSID);

    #region AccessMask
    public class AccessMask
    {
        public static uint FullAccess = 0x1F01FF;
        public static uint FILE_LIST_DIRECTORY = 0x1;
        public static uint FILE_ADD_FILE = 0x2;
        public static uint FILE_ADD_SUBDIRECTORY = 0x4;
        public static uint FILE_READ_EA = 0x8;
        public static uint FILE_WRITE_EA = 0x10;
        public static uint FILE_TRAVERSE = 0x20;
        public static uint FILE_DELETE_CHILD = 0x40;
        public static uint FILE_READ_ATTRIBUTES = 0x80;
        public static uint FILE_WRITE_ATTRIBUTES = 0x100;
        public static uint DELETE  = 0x10000;
        public static uint READ_CONTROL = 0x20000;
        public static uint WRITE_DAC = 0x40000;
        public static uint WRITE_OWNER = 0x80000;
        public static uint SYNCHRONIZE = 0x100000;
    }
    #endregion
    #region AceFlags
    public class AceFlags
    {
        public static uint OBJECT_INHERIT_ACE = 0x1;
        public static uint CONTAINER_INHERIT_ACE = 0x2;
        public static uint NO_PROPAGATE_INHERIT_ACE = 0x4;
        public static uint INHERIT_ONLY_ACE = 0x8;
        public static uint INHERITED_ACE = 0x10;
        public static uint SUCCESSFUL_ACCESS_ACE_FLAG = 0x40;
        public static uint FAILED_ACCESS_ACE_FLAG = 0x80;
    }
    #endregion
    #region AceType
    public class AceType
    {
        public static uint ACCESS_ALLOWED_ACE = 0;
        public static uint ACCESS_DENIED_ACE = 1;
        public static uint AUDIT_ACE = 2;
    }
    #endregion
            #region SecurtyDescriptor
    public class ControlFlags
    {
        public static uint SE_OWNER_DEFAULTED = 0x1;
        public static uint SE_GROUP_DEFAULTED = 0x2;
        public static uint SE_DACL_PRESENT = 0x4;
        public static uint SE_DACL_DEFAULTED = 0x8;
        public static uint SE_SACL_PRESENT = 0x10;
        public static uint SE_SACL_DEFAULTED = 0x20;
        public static uint SE_DACL_AUTO_INHERIT_REQ = 0x100;
        public static uint SE_SACL_AUTO_INHERIT_REQ = 0x200;
        public static uint SE_DACL_AUTO_INHERITED = 0x400;
        public static uint SE_SACL_AUTO_INHERITED = 0x800;
        public static uint SE_DACL_PROTECTED = 0x1000;
        public static uint SE_SACL_PROTECTED = 0x2000;
        public static uint SE_SELF_RELATIVE = 0x8000;
    }
    #endregion

    public static ManagementObject GetInstance(string Account, uint
        AccessMask, uint AceType, uint AceFlags)
    {
        ManagementObject Ace = new
            System.Management.ManagementClass("Win32_Ace").CreateInstance();
        Ace["Trustee"] = Win32_Trustee(Account);
        Ace["AccessMask"] = AccessMask;
        Ace["AceType"] = AceType;
        Ace["AceFlags"] = AceFlags;
        return Ace;
    }

    private static ManagementObject Win32_Trustee(string Account)
    {
        byte[] SID = null;
        ManagementObjectCollection UserSearch =
            new ManagementObjectSearcher("Select * From Win32_Account Where Name = '" + Account + "'").Get();
        try
        {
            foreach(ManagementObject UserObject in UserSearch)
            {
                IntPtr SID_ptr=new IntPtr(0);
                ConvertStringSidToSid(UserObject["SID"].ToString(), out SID_ptr);
                int size = (int)GetLengthSid(SID_ptr);
                SID = new byte[size];
                Marshal.Copy(SID_ptr, SID, 0, size);
                Marshal.FreeHGlobal(SID_ptr);
            }
        }
        catch (Exception se)
        {
            Trace.WriteLine(se.Message);
        }
        ManagementObject Trustee = new System.Management.ManagementClass("Win32_Trustee").CreateInstance();
        Trustee["SID"] = SID;
        return Trustee;
    }

}

Alternative Managed API:

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).