.Net多进程通信共享内存映射文件Memory Mapped

   //持久内存映射文件:基于现有文件创建一个具有指定公用名的内存映射文件
    using (var mmf = MemoryMappedFile.CreateFromFile(@"c:\内存映射文件.data", FileMode.Open, "公用名"))
    {
        //通过指定的 偏移量和大小 创建内存映射文件视图服务器
        using (var accessor = mmf.CreateViewAccessor(offset, length)) //偏移量，可以控制数据存储的内存位置；大小，用来控制存储所占用的空间
        {
            //Marshal提供了一个方法集，这些方法用于分配非托管内存、复制非托管内存块、将托管类型转换为非托管类型，此外还提供了在与非托管代码交互时使用的其他杂项方法。
            int size = Marshal.SizeOf(typeof(char));
            //修改内存映射文件视图
            for (long i = 0; i < length; i += size)
            {
                char c= accessor.ReadChar(i);
                accessor.Write(i, ref c);
            }
        }
    }
    //另一个进程或线程可以，在系统内存中打开一个具有指定名称的现有内存映射文件
    using (var mmf = MemoryMappedFile.OpenExisting("公用名"))
    {
        using (var accessor = mmf.CreateViewAccessor(4000000, 2000000))
        {
            int size = Marshal.SizeOf(typeof(char));
            for (long i = 0; i < length; i += size)
            {
                char c = accessor.ReadChar(i);
                accessor.Write(i, ref c);
            }
        }
    }

//非持久内存映射文件：未映射到磁盘上的现有文件的内存映射文件
    using (MemoryMappedFile mmf = MemoryMappedFile.CreateNew("testmap", 10000))
    {
        bool mutexCreated;
        //进程间同步
        Mutex mutex = newMutex(true, "testmapmutex", out mutexCreated);
        using (var stream = mmf.CreateViewStream()) //创建文件内存视图流 基于流的操作
        {
            var writer = newBinaryWriter(stream);
            writer.Write(1);
        }
        mutex.ReleaseMutex();
        Console.WriteLine("Start Process B and press ENTER to continue.");
        Console.ReadLine();
        mutex.WaitOne();
        using (MemoryMappedViewStream stream = mmf.CreateViewStream())
        {
            var reader = newBinaryReader(stream);
            Console.WriteLine("Process A says: {0}", reader.ReadBoolean());
            Console.WriteLine("Process B says: {0}", reader.ReadBoolean());
        }
        mutex.ReleaseMutex();
    }
    using (MemoryMappedFile mmf = MemoryMappedFile.OpenExisting("testmap"))
    {
         Mutex mutex = Mutex.OpenExisting("testmapmutex");
        mutex.WaitOne();
       using (var stream = mmf.CreateViewStream(1, 0))//注意这里的偏移量
        {
            var writer = newBinaryWriter(stream);
            writer.Write(0);
        }
        mutex.ReleaseMutex();
    }

using System;
using System.io;
using System.IO.MemoryMappedFiles;
using System.Runtime.InteropServices;
using System.Threading;
namespace IMServer_Message
{
    /// <summary>
    /// 用于共享内存方式通信的 值类型 结构体
    /// </summary>
    public struct ServiceMsg
    {
        public int Id;
        public long NowTime;
    }
    internal class Program
    {
        private static void Main(string[] args)
        {
            Console.Write("请输入共享内存公用名(默认:testmap):");
            string shareName = Console.ReadLine();
            if (string.IsNullOrEmpty(shareName))
                shareName = "testmap";
            using (MemoryMappedFile mmf = MemoryMappedFile.CreateOrOpen(shareName, 1024000,MemoryMappedFileAccess.ReadWrite))
            {
                bool mutexCreated;
                //进程间同步
                var mutex = new Mutex(true, "testmapmutex", out mutexCreated);
                using (MemoryMappedViewStream stream = mmf.CreateViewStream()) //创建文件内存视图流
                {
                    var writer = new BinaryWriter(stream);
                    for (int i = 0; i < 5; i++)
                    {
                        writer.Write(i);
                        Console.WriteLine("{0}位置写入流:{0}", i);
                    }
                }
                mutex.ReleaseMutex();
                Console.WriteLine("启动状态服务，按【回车】读取共享内存数据");
                Console.ReadLine();
                mutex.WaitOne();
                using (MemoryMappedViewStream stream = mmf.CreateViewStream())
                {
                    var reader = new BinaryReader(stream);
                    for (int i = 0; i < 10; i++)
                    {
                        Console.WriteLine("{1}位置:{0}", reader.ReadInt32(), i);
                    }
                }
                using (MemoryMappedViewAccessor accessor = mmf.CreateViewAccessor(1024, 10240))
                {
                    int colorSize = Marshal.SizeOf(typeof (ServiceMsg));
                    ServiceMsg color;
                    for (int i = 0; i < 50; i += colorSize)
                    {
                        accessor.Read(i, out color);
                        Console.WriteLine("{1}\tNowTime:{0}", new DateTime(color.NowTime), color.Id);
                    }
                }
                mutex.ReleaseMutex();
            }
            Console.WriteLine("测试： 我是 即时通讯 - 消息服务 我启动啦！！！");
            Console.ReadKey();
        }
    }
}

using System;
using System.IO;
using System.IO.MemoryMappedFiles;
using System.Runtime.InteropServices;
using System.Threading;
namespace IMServer_State
{
    /// <summary>
    /// 用于共享内存方式通信的 值类型 结构体
    /// </summary>
    public struct ServiceMsg
    {
        public int Id;
        public long NowTime;
    }
    internal class Program
    {
        private static void Main(string[] args)
        {
            Console.Write("请输入共享内存公用名(默认:testmap):");
            string shareName = Console.ReadLine();
            if (string.IsNullOrEmpty(shareName))
                shareName = "testmap";
            using (MemoryMappedFile mmf = MemoryMappedFile.CreateOrOpen(shareName, 1024000,MemoryMappedFileAccess.ReadWrite))
            {
                Mutex mutex = Mutex.OpenExisting("testmapmutex");
                mutex.WaitOne();
                using (MemoryMappedViewStream stream = mmf.CreateViewStream(20, 0)) //注意这里的偏移量
                {
                    var writer = new BinaryWriter(stream);
                    for (int i = 5; i < 10; i++)
                    {
                        writer.Write(i);
                        Console.WriteLine("{0}位置写入流:{0}", i);
                    }
                }
                using (MemoryMappedViewAccessor accessor = mmf.CreateViewAccessor(1024, 10240))
                {
                    int colorSize = Marshal.SizeOf(typeof (ServiceMsg));
                    var color = new ServiceMsg();
                    for (int i = 0; i < colorSize*5; i += colorSize)
                    {
                        color.Id = i;
                        color.NowTime = DateTime.Now.Ticks;
                        //accessor.Read(i, out color);
                        accessor.Write(i, ref color);
                        Console.WriteLine("{1}\tNowTime:{0}", new DateTime(color.NowTime), color.Id);
                        Thread.Sleep(1000);
                    }
                }
                Thread.Sleep(5000);
                mutex.ReleaseMutex();
            }
            Console.WriteLine("测试： 我是 即时通讯 - 状态服务 我启动啦！！！");
            Console.ReadKey();
        }
    }
}