C# 對結構體和指針的使用

//結構體的定義

[StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
        public struct VGAStat
        {
            public int length;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
            public int[] number;
        }

     
        public struct VGAStat1
        {
            public string str;
            public IntPtr intptr1;//指針的定義
        }

        private void Form1_Load(object sender, EventArgs e)
        {

           /********初始化結構體VGAStat*****************/
            VGAStat pp = new VGAStat();   
            pp.length = 123;
            pp.number=new int[6];
            for (int i = 0; i < 6; i++)
            {
                pp.number[i] = i + 1;
            }

　　　/**************************************************/

            IntPtr intpt = Marshal.AllocHGlobal(Marshal.SizeOf(pp));   //對intpt分配內存
            Marshal.StructureToPtr(pp, intpt, true); 將數據封送到intpt

 

　　　/********初始化結構體VGAStat1*****************/

            VGAStat1 vga = new VGAStat1();
            vga.intptr1 = intpt;

　　 /**************************************************/

 

            VGAStat entries = (VGAStat)Marshal.PtrToStructure(vga.intptr1, typeof(VGAStat));   

 

          /********讀取結構體數據*****************/
            string Number = string.Empty;

            int ReadLength = entries.length;        //ReadLength=132
            for (int i = 0; i < 6; i++)
            {
                Number = Number + entries.number[i].ToString(); //Number="123456"
            }

         /**************************************************/