using System;
using System.Text;
using System.Runtime.InteropServices;

namespace ConsoleApp4
{
    [StructLayout(LayoutKind.Sequential)]
    struct Utf8Struct
    {
        [MarshalAs(UnmanagedType.LPUTF8Str, SizeConst = 30)]
        public string Value;
    }

    [StructLayout(LayoutKind.Sequential,CharSet=CharSet.Unicode)]
    struct StrStruct
    {
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 30)]
        public string Value;
    }
    class Program
    {
        static void Main() {

            var stringValue = "测试文字一二";
            UTF8Test(stringValue);
            UnicodeTest(stringValue);


            Console.ReadLine();
        }

        public static void UTF8Test(string stringValue) {
            byte[] a = Encoding.UTF8.GetBytes(stringValue);
            Console.WriteLine(BitConverter.ToString(a).Replace("-", " "));

            var sizeOfStruct = Marshal.SizeOf<Utf8Struct>();
            var structPtr = Marshal.AllocHGlobal(Marshal.SizeOf<Utf8Struct>());
            Marshal.StructureToPtr(new Utf8Struct { Value = stringValue }, structPtr, false);
            var utf8Struct = Marshal.PtrToStructure<Utf8Struct>(structPtr);
            Console.WriteLine(utf8Struct.Value);
            var structAddress = Marshal.ReadIntPtr(structPtr);
            Console.WriteLine($"{structPtr.ToInt64():X}");
            Console.WriteLine($"{structAddress.ToInt64():X}");
            for (int i = 0; i <= sizeOfStruct * 2 + 1; i++) {
                Console.Write($"{Marshal.ReadByte(structAddress + i):X2} ");
            }
            Marshal.FreeHGlobal(structPtr);
            Console.WriteLine();
        }

        public static void UnicodeTest(string stringValue) {
            byte[] a = Encoding.Unicode.GetBytes(stringValue);
            Console.WriteLine(BitConverter.ToString(a).Replace("-", " "));

            var sizeOfStruct = Marshal.SizeOf<StrStruct>();
            var structPtr = Marshal.AllocHGlobal(Marshal.SizeOf<StrStruct>());
            Marshal.StructureToPtr(new StrStruct { Value = stringValue }, structPtr, false);
            var utf8Struct = Marshal.PtrToStructure<StrStruct>(structPtr);
            Console.WriteLine(utf8Struct.Value);

            var structAddress = Marshal.ReadIntPtr(structPtr);
            //var structAddress = structPtr;
            Console.WriteLine($"{structPtr.ToInt64():X}");
            Console.WriteLine($"{structAddress.ToInt64():X}");
            for (int i = 0; i <= sizeOfStruct * 2 + 1; i++) {
                Console.Write($"{Marshal.ReadByte(structPtr + i):X2} ");
            }
            Marshal.FreeHGlobal(structPtr);
        }
    }
}