c# 通过内存映射实现文件共享内存的示例代码

using System;
using System.Collections.Generic;Android从资源文件中读取文件流显示
using System.Linq;
using System.Text;

using System.IO;

//引用内存映射文件命名空间
using System.IO.MemoryMappedFiles;

namespace App1
{
    class Program
    {
        static void Main(string[] args)
        {
            long capacity = 1<<10<<10;

            //创建或者打开共享内存
            using (var mmf = MemoryMappedFile.CreateOrOpen("testMmf", capacity, MemoryMappedFileAccess.ReadWrite))
            {
                //通过MemoryMappedFile的CreateViewAcCSSor方法获得共享内存的访问器
                var viewAccessor = mmf.CreateViewAccessor(0, capacity);
                //循环写入，使在这个进程中可以向共享内存中写入不同的字符串值
                while (true)
                {
                    Console.WriteLine("请输入一行要写入共享内存的文字：");

                    string input = Console.ReadLine();

                    //向共享内存开始位置写入字符串的长度
                    viewAccessor.Write(0, input.Length);

                    //向共享内存4位置写入字符
                    viewAccessor.WriteArray<char>(4, input.ToArray(), 0, input.Length);
                }

            }
            
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

//引用使用内存映射文件需要的命名空间
using System.IO.MemoryMappedFiles;

namespace App2
{
    class Program
    {
        static void Main(string[] args)
        {
              long capacity = 1<<10<<10;

              using (var mmf = MemoryMappedFile.OpenExisting("testMmf"))
              {
                  MemoryMappedViewAccessor viewAccessor = mmf.CreateViewAccessor(0, capacity);

                  //循环刷新共享内存字符串的值
                  while (true)
                  {
                      //读取字符长度
                      int strLength = viewAccessor.ReadInt32(0);                      
                      char[] charsInMMf = new char[strLength];
                      //读取字符
                      viewAccessor.ReadArray<char>(4, charsInMMf, 0, strLength);
                      Console.Clear();
                      Console.Write(charsInMMf);
                      Console.Write("\r");
                      Thread.Sleep(200);
                  }
              }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.IO.MemoryMappedFiles;
using System.IO;

namespace App3
{
    class Program
    {
        static void Main(string[] args)
        {
            long capacity = 1 << 10 << 10;
            //打开共享内存
            using (var mmf = MemoryMappedFile.OpenExisting("testMmf"))
            {
                //使用CreateViewStream方法返回stream实例
                using (var mmViewStream = mmf.CreateViewStream(0, capacity))
                {
                    //这里要制定Unicode编码否则会出问题
                    using (BinaryReader rdr = new BinaryReader(mmViewStream,Encoding.Unicode))
                    {
                        while (true)
                        {
                            mmViewStream.Seek(0, SeekOrigin.Begin);

                            int length = rdr.ReadInt32();

                            char[] chars = rdr.ReadChars(length);

                            Console.Write(chars);
                            Console.Write("\r");

                            System.Threading.Thread.Sleep(200);
                            Console.Clear();
                        }
                    }
                }
            }
        }
    }
}