少有人走的路
//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();
}IMServer_Message.exe 代码
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();
}
}
}IMServer_State.exe代码
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();
}
}
}源代码如下：
链接：https://pan.baidu.com/s/1x09IixcsRBSFKlEhCF1MNg
提取码：q2al
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