C# Marshal类基本概念和入门实例讲解

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
 
namespace marshalDemo1
{
    public struct Point
    {
        public Int32 x, y;
    }
 
    public partial class Form1 : Form
    {
 
        [DllImport("Kernel32", ExactSpelling = true, SetLastError = true)]
        static extern Boolean CloseHandle(IntPtr h);
 
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text = Marshal.SystemDefaultCharSize.ToString();
            textBox2.Text = Marshal.SystemMaxDBCSCharSize.ToString();
            textBox3.Text = Marshal.SizeOf(typeof(Point)).ToString();
            Point p = new Point(); 
            textBox4.Text = Marshal.SizeOf(p).ToString();
            IntPtr hglobal = Marshal.AllocHGlobal(100);
            textBox5.Text = hglobal.ToString();
            Marshal.FreeHGlobal(hglobal);
 
            Boolean f = CloseHandle(new IntPtr(-1));
            if (!f)
            {
                Console.WriteLine("CloseHandle call failed with an error code of: {0}",
                    Marshal.GetLastWin32Error());
            }
        }
    }
}

//初始化缓存指针对应的非托管内存
IntPtr IntPtr变量 = Marshal.AllocHGlobal(缓存Byte长度);
采集循环
{
    //讲采集得到的Int一维数组拷贝到缓存
    Marshal.Copy(采集一维数组, 0, IntPtr变量, 数组sample长度);
    //将缓存写入矢量文件
    vectorFile.Write(IntPtr变量, 缓存Byte长度);
}
//释放缓存
Marshal.FreeHGlobal(IntPtr变量);
//关闭文件
vectorFile.Close();

//初始化缓存指针对应的非托管内存
IntPtr IntPtr变量 = Marshal.AllocHGlobal(缓存Byte长度);
读文件循环
{
    //矢量文件读入缓存
    vectorFile.read(IntPtr变量, 缓存Byte长度);
    //缓存拷贝入一维数组， 数组长度=缓存Byte长度 /4 （因为4 bytes per int32)
    Marshal.Copy(IntPtr变量, 一维数组, 0, 数组sample长度);
    //由Int32 一维数组 转换为2维 double数组使用
}
//释放缓存
Marshal.FreeHGlobal(IntPtr变量);
//关闭文件
vectorFile.Close();