[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 8)]
        public struct XEDPARSE
        {
            public int x64;                        // use 64-bit instructions
            public UInt64 cip;                         //instruction pointer (for relative addressing)
            public int dest_size;                   //destination size (returned by XEDParse)
            public int cbUnknown;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = XEDPARSE_MAXASMSIZE)]
            public string dest;                        //destination buffer
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = XEDPARSE_MAXBUFSIZE)]
            public string instr;                       //instruction text
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = XEDPARSE_MAXBUFSIZE)]
            public string error;                       //error text (in case of an error)
        };

[DllImport("XEDParse.dll", EntryPoint = "XEDParseAssemble",CallingConvention = CallingConvention.Cdecl)]
        static extern int XEDParseAssemble(ref XEDPARSE xedparse);

void Test()
        {
            XEDPARSE parse = new XEDPARSE();
            parse.x64 = 0;
            parse.cip = 0;
            parse.instr = @"mov esp, ebp";

            int result=XEDParseAssemble(ref parse);
            ;
        }