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;using System.Threading;using System.Diagnostics;namespace AppOne{    public partial class AppOneMain : Form    {        const int INVALID_HANDLE_VALUE = http://www.mamicode.com/-1;        const int PAGE_READWRITE = 0x04;        [DllImport("User32.dll")]        private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);        [DllImport("User32.dll")]        private static extern bool SetForegroundWindow(IntPtr hWnd);        //共享内存        [DllImport("Kernel32.dll", EntryPoint = "CreateFileMapping")]        private static extern IntPtr CreateFileMapping(IntPtr hFile, //HANDLE hFile,         UInt32 lpAttributes,//LPSECURITY_ATTRIBUTES lpAttributes,  //0         UInt32 flProtect,//DWORD flProtect         UInt32 dwMaximumSizeHigh,//DWORD dwMaximumSizeHigh,         UInt32 dwMaximumSizeLow,//DWORD dwMaximumSizeLow,         string lpName//LPCTSTR lpName         );        [DllImport("Kernel32.dll", EntryPoint = "OpenFileMapping")]        private static extern IntPtr OpenFileMapping(         UInt32 dwDesiredAccess,//DWORD dwDesiredAccess,         int bInheritHandle,//BOOL bInheritHandle,         string lpName//LPCTSTR lpName         );        const int FILE_MAP_ALL_ACCESS = 0x0002;        const int FILE_MAP_WRITE = 0x0002;        [DllImport("Kernel32.dll", EntryPoint = "MapViewOfFile")]        private static extern IntPtr MapViewOfFile(         IntPtr hFileMappingObject,//HANDLE hFileMappingObject,         UInt32 dwDesiredAccess,//DWORD dwDesiredAccess         UInt32 dwFileOffsetHight,//DWORD dwFileOffsetHigh,         UInt32 dwFileOffsetLow,//DWORD dwFileOffsetLow,         UInt32 dwNumberOfBytesToMap//SIZE_T dwNumberOfBytesToMap         );        [DllImport("Kernel32.dll", EntryPoint = "UnmapViewOfFile")]        private static extern int UnmapViewOfFile(IntPtr lpBaseAddress);        [DllImport("Kernel32.dll", EntryPoint = "CloseHandle")]        private static extern int CloseHandle(IntPtr hObject);        private Semaphore m_Write;  //可写的信号        private Semaphore m_Read;  //可读的信号        private IntPtr handle;     //文件句柄        private IntPtr addr;       //共享内存地址        uint mapLength;            //共享内存长        //线程用来读取数据        Thread threadRed;        public AppOneMain()        {            InitializeComponent();            init();        }                    ///<summary>/// 初始化共享内存数据 创建一个共享内存        ///</summary>privatevoid init()        {            m_Write = new Semaphore(1, 1, "WriteMap");//开始的时候有一个可以写            m_Read = new Semaphore(0, 1, "ReadMap");//没有数据可读            mapLength = 1024;            IntPtr hFile = new IntPtr(INVALID_HANDLE_VALUE);            handle = CreateFileMapping(hFile, 0, PAGE_READWRITE, 0, mapLength, "shareMemory");            addr = MapViewOfFile(handle, FILE_MAP_ALL_ACCESS, 0, 0, 0);            //handle = OpenFileMapping(0x0002, 0, "shareMemory");            //addr = MapViewOfFile(handle, FILE_MAP_ALL_ACCESS, 0, 0, 0);            threadRed = new Thread(new ThreadStart(ThreadReceive));            threadRed.Start();        }        /// <summary>        /// 线程启动从共享内存中获取数据信息         /// </summary>        private void ThreadReceive()        {            myDelegate myI = new myDelegate(changeTxt);            while (true)            {                try                {                    //m_Write = Semaphore.OpenExisting("WriteMap");                    //m_Read = Semaphore.OpenExisting("ReadMap");                    //handle = OpenFileMapping(FILE_MAP_WRITE, 0, "shareMemory");                    //读取共享内存中的数据：                    //是否有数据写过来                    m_Read.WaitOne();                    //IntPtr m_Sender = MapViewOfFile(handle, FILE_MAP_ALL_ACCESS, 0, 0, 0);                    byte[] byteStr = new byte[100];                    byteCopy(byteStr, addr);                    string str = Encoding.Default.GetString(byteStr, 0, byteStr.Length);                   /////调用数据处理方法 处理读取到的数据                    m_Write.Release();                }                catch (WaitHandleCannotBeOpenedException)                {                    continue;                    //Thread.Sleep(0);                }            }        }        //不安全的代码在项目生成的选项中选中允许不安全代码        static unsafe void byteCopy(byte[] dst, IntPtr src)        {            fixed (byte* pDst = dst)            {                byte* pdst = pDst;                byte* psrc = http://www.mamicode.com/(byte*)src;                while ((*pdst++ = *psrc++) != ‘\0‘)                    ;            }        }    }}