pinvoke - AdjustTokenPrivilege c# 0x80070057 -


i trying write uefi properties. appears need raise token privileges. have used http://www.pinvoke.net/default.aspx/advapi32.adjusttokenprivileges guide this.

i keep getting error e_invalid arguments

    public static void enabledisableprivilege(string privilegename, bool enabledisable)     {         //gets process token handle using pinvoke         var intokenhandle = intptr.zero;         if (!openprocesstoken(process.getcurrentprocess().handle, tokenaccesslevels.adjustprivileges | tokenaccesslevels.query, out intokenhandle))         {             marshal.throwexceptionforhr(marshal.gethrforlastwin32error());             return;         }          //enumerates current privileges of token handle         var innewstate = new token_privileges { privilegecount = 1, privileges = new luid_and_attributes[1] };          //attempts lookup inputed privilege         luid luid;         if (!lookupprivilegevalue(null, privilegename, out luid))         {             marshal.throwexceptionforhr(marshal.gethrforlastwin32error());             return;         }         //adds new privilige token whilst retaining other priviliges         innewstate.privileges[0].luid = luid;         innewstate.privileges[0].attributes = (uint)(enabledisable ? 2 : 0);          //attempts set priviliges token handle.         if (!adjusttokenprivileges(intokenhandle, false, ref innewstate, 256, intptr.zero, intptr.zero))         {             marshal.throwexceptionforhr(marshal.gethrforlastwin32error());             return;         }     }      /// <summary>     /// luid 64-bit value guaranteed unique on system on generated     /// </summary>     [structlayout(layoutkind.sequential)]     public struct luid     {         /// <summary>         /// low order bits         /// </summary>         public uint lowpart { get; set; }         /// <summary>         /// high order bits         /// </summary>         public int highpart { get; set; }     }       /// <summary>     /// luid_and_attributes structure represents locally unique identifier (luid) , attributes.     /// </summary>     [structlayout(layoutkind.sequential)]     public struct luid_and_attributes     {         /// <summary>         /// specifies high order bits , low order bits stucture         /// </summary>         public luid luid { get; set; }         /// <summary>         /// specifies attributes of luid. value contains 32 one-bit flags.         /// </summary>         public uint attributes { get; set; }     }     /// <summary>     /// token_privileges structure contains information set of privileges access token.     /// </summary>     [structlayout(layoutkind.sequential)]     public struct token_privileges     {         /// <summary>         /// must set number of entries in privileges array.         /// </summary>         public uint privilegecount { get; set; }         /// <summary>         /// specifies array of luid_and_attributes structures.          /// </summary>         public luid_and_attributes[] privileges { get; set; }     }      [dllimport("advapi32", setlasterror = true)]     [return: marshalas(unmanagedtype.bool)]     public static extern bool openprocesstoken(         intptr processhandle,          tokenaccesslevels desiredaccess,          out intptr tokenhandle);      [dllimport("advapi32.dll", setlasterror = true)]     [return: marshalas(unmanagedtype.bool)]     public static extern bool adjusttokenprivileges(         intptr tokenhandle,         [marshalas(unmanagedtype.bool)]bool disableallprivileges,          ref token_privileges newstate,          uint bufferlengthinbytes,          intptr previousstate,          intptr returnlength);      [dllimport("advapi32.dll", setlasterror = true)]     [return: marshalas(unmanagedtype.bool)]     public static extern bool lookupprivilegevalue(         string lpsystemname,          string lpname,          out luid lpluid);

calling code: //enable privilege implementing following line in code: privileges.enabledisableprivilege("sesystemenvironmentprivilege", true);

im not sure have gone wrong here.


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