C# 共享内存怎么实现啊

[supegg]

有A、B两个WPF程序，分别有一个文本框，我想在A程序文本框中输入一个字符串，然后B程序的文本框中实时重现A程序文本框的内容。
用共享内存怎么实现啊？？？

[xonln]

C#操作内存相当的弱，还是用C++吧，真的

[supegg]

[Quote=引用 7 楼 bdmh 的回复:]

用api的
CreateFileMapping()
OpenFileMapping()
[/Quote]
我找到了一个例子，有怎么用CreateFileMapping()，但是没有如何用OpenFileMapping()的，能具体介绍怎么用嘛。

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace ShareMemLib
{
    public class ShareMem
    {
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, int wParam, IntPtr lParam);

        [DllImport("Kernel32.dll", CharSet = CharSet.Auto)]
        public static extern IntPtr CreateFileMapping(int hFile, IntPtr lpAttributes, uint flProtect, uint dwMaxSizeHi, uint dwMaxSizeLow, string lpName);

        [DllImport("Kernel32.dll", CharSet = CharSet.Auto)]
        public static extern IntPtr OpenFileMapping(int dwDesiredAccess, [MarshalAs(UnmanagedType.Bool)] bool bInheritHandle, string lpName);

        [DllImport("Kernel32.dll", CharSet = CharSet.Auto)]
        public static extern IntPtr MapViewOfFile(IntPtr hFileMapping, uint dwDesiredAccess, uint dwFileOffsetHigh, uint dwFileOffsetLow, uint dwNumberOfBytesToMap);

        [DllImport("Kernel32.dll", CharSet = CharSet.Auto)]
        public static extern bool UnmapViewOfFile(IntPtr pvBaseAddress);

        [DllImport("Kernel32.dll", CharSet = CharSet.Auto)]
        public static extern bool CloseHandle(IntPtr handle);

        [DllImport("kernel32", EntryPoint = "GetLastError")]
        public static extern int GetLastError();

        const int ERROR_ALREADY_EXISTS = 183;

        const int FILE_MAP_COPY = 0x0001;
        const int FILE_MAP_WRITE = 0x0002;
        const int FILE_MAP_READ = 0x0004;
        const int FILE_MAP_ALL_ACCESS = 0x0002 | 0x0004;

        const int PAGE_READONLY = 0x02;
        const int PAGE_READWRITE = 0x04;
        const int PAGE_WRITECOPY = 0x08;
        const int PAGE_EXECUTE = 0x10;
        const int PAGE_EXECUTE_READ = 0x20;
        const int PAGE_EXECUTE_READWRITE = 0x40;

        const int SEC_COMMIT = 0x8000000;
        const int SEC_IMAGE = 0x1000000;
        const int SEC_NOCACHE = 0x10000000;
        const int SEC_RESERVE = 0x4000000;

        const int INVALID_HANDLE_VALUE = -1;

        IntPtr m_hSharedMemoryFile = IntPtr.Zero;
        IntPtr m_pwData = IntPtr.Zero;
        bool m_bAlreadyExist = false;
        bool m_bInit = false;
        long m_MemSize = 0;

        public ShareMem()
        {
        }
        ~ShareMem()
        {
            Close();
        }

        /// <summary>
        /// 初始化共享内存
        /// </summary>
        /// <param name="strName">共享内存名称</param>
        /// <param name="lngSize">共享内存大小</param>
        /// <returns></returns>
        public int Init(string strName, long lngSize)
        {
            if (lngSize <= 0 || lngSize > 0x00800000) lngSize = 0x00800000;
            m_MemSize = lngSize;
            if (strName.Length > 0)
            {
                //创建内存共享体(INVALID_HANDLE_VALUE)
                m_hSharedMemoryFile = CreateFileMapping(INVALID_HANDLE_VALUE, IntPtr.Zero, (uint)PAGE_READWRITE, 0, (uint)lngSize, strName);
                if (m_hSharedMemoryFile == IntPtr.Zero)
                {
                    m_bAlreadyExist = false;
                    m_bInit = false;
                    return 2; //创建共享体失败
                }
                else
                {
                    if (GetLastError() == ERROR_ALREADY_EXISTS)  //已经创建
                    {
                        m_bAlreadyExist = true;
                    }
                    else                                         //新创建
                    {
                        m_bAlreadyExist = false;
                    }
                }
                //---------------------------------------
                //创建内存映射
                m_pwData = MapViewOfFile(m_hSharedMemoryFile, FILE_MAP_WRITE, 0, 0, (uint)lngSize);
                if (m_pwData == IntPtr.Zero)
                {
                    m_bInit = false;
                    CloseHandle(m_hSharedMemoryFile);
                    return 3; //创建内存映射失败
                }
                else
                {
                    m_bInit = true;
                    if (m_bAlreadyExist == false)
                    {
                        //初始化
                    }
                }
                //----------------------------------------
            }
            else
            {
                return 1; //参数错误     
            }

            return 0;     //创建成功
        }
        /// <summary>
        /// 关闭共享内存
        /// </summary>
        public void Close()
        {
            if (m_bInit)
            {
                UnmapViewOfFile(m_pwData);
                CloseHandle(m_hSharedMemoryFile);
            }
        }

        /// <summary>
        /// 读数据
        /// </summary>
        /// <param name="bytData">数据</param>
        /// <param name="lngAddr">起始地址</param>
        /// <param name="lngSize">个数</param>
        /// <returns></returns>
        public int Read( byte[] bytData, int lngAddr, int lngSize)
        {
            if (lngAddr + lngSize > m_MemSize) return 2; //超出数据区
            if (m_bInit)
            {
                Marshal.Copy(m_pwData, bytData, lngAddr, lngSize);
            }
            else
            {
                return 1; //共享内存未初始化
            }
            return 0;     //读成功
        }

        /// <summary>
        /// 写数据
        /// </summary>
        /// <param name="bytData">数据</param>
        /// <param name="lngAddr">起始地址</param>
        /// <param name="lngSize">个数</param>
        /// <returns></returns>
        public int Write(byte[] bytData, int lngAddr, int lngSize)
        {
            if (lngAddr + lngSize > m_MemSize) return 2; //超出数据区
            if (m_bInit)
            {
                Marshal.Copy(bytData, lngAddr, m_pwData, lngSize);
            }
            else
            {
                return 1; //共享内存未初始化
            }
            return 0;     //写成功
        }
    }
}

[supegg]

我在论坛上看到一个例子，但不知道为什么我这里下不了，好心的大虫下了传给我吧。Email：[e-mail]
http://download.csdn.net/source/799294

[萤火架构]

共享内存没做过，网上找到的例子：

http://www.cnblogs.com/caolisong/articles/1043152.html

还可以使用WCF

[gaoranaa]

这个，我建议你直接使用共享缓存框架吧，正好我手头有个项目需要用到缓存共享，花了N天研究内存在不同程序域之间共享的问题，也找了很多网上现成的实例，结果发现基本都有BUG，有时甚至机器卡死，后来发现了memcached,这东西你去搜一下就知道了，应该可以实现你项目的要求，单服务器多服务器之间多程序域之间的内存共享，另外还有NorthScale Memcached Server这个貌似也不错，不过查了一些技术资料发现很多人都说目前的最新版有很多BUG，打算过段时间再研究研究，现在先把手头的项目搞定，在用memcached1.6.4.1版的

[gaoranaa]

哦，没注意看你需要的是即时显示结果，这样的话建议你自己写socket比较好

[mrsupersky]

如果是同一个程序两个窗体的话那就简单了。。。
如果是两个应用程序的话，比较复杂建议看看MSDN帮助文档，就我所知，方法也有很多，管道法不错。。。。

[LutzMark]

WPF进程间通讯
进程一
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Runtime.InteropServices;
namespace WpfMain
{
/// <summary>
/// Window1.xaml 的交互逻辑
/// </summary>
public partial class Window1 : Window
{
const int WM_COPYDATA = 0x004A;
public Window1()
{
InitializeComponent ();
}


void changestyle(string strcolor)
{
}

[DllImport ("User32.dll", EntryPoint = "SendMessage")]
private static extern int SendMessage(
int hWnd, // handle to destination window
int Msg, // message
int wParam, // first message parameter
ref COPYDATASTRUCT lParam // second message parameter
);
[DllImport ("User32.dll", EntryPoint = "FindWindow")]
private static extern int FindWindow(string lpClassName, string
lpWindowName);

private void btblack_Click(object sender, RoutedEventArgs e)
{
int WINDOW_HANDLER = FindWindow (null, "Window1");
if ( WINDOW_HANDLER != 0 )
{
byte[] sarr = System.Text.Encoding.Default.GetBytes ("Black");
int len = sarr.Length;
COPYDATASTRUCT cds;
cds.dwData = ( IntPtr )100;
cds.lpData = "Black";
cds.cbData = len + 1;
SendMessage (WINDOW_HANDLER, WM_COPYDATA, 0, ref cds);
}
}
public struct COPYDATASTRUCT
{
public IntPtr dwData;
public int cbData;
[MarshalAs (UnmanagedType.LPStr)]
public string lpData;
}
private void btblue_Click(object sender, RoutedEventArgs e)
{
int WINDOW_HANDLER = FindWindow (null, "Window1");
if ( WINDOW_HANDLER != 0 )
{
byte[] sarr = System.Text.Encoding.Default.GetBytes ("Blue");
int len = sarr.Length;
COPYDATASTRUCT cds;
cds.dwData = ( IntPtr )100;
cds.lpData = "Blue";
cds.cbData = len + 1;
SendMessage (WINDOW_HANDLER, WM_COPYDATA, 0, ref cds);
}
}

}
}

进程2
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Runtime.InteropServices;
using System.Windows.Interop;
using Microsoft;
namespace WpfChildren
{
/// <summary>
/// Window1.xaml 的交互逻辑
/// </summary>
public partial class Window1 : Window
{
const int WM_COPYDATA = 0x004A;
public Window1()
{
InitializeComponent ();
}
IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
switch ( msg )
{
case WM_COPYDATA:
Win32.CopyDataStruct st = ( Win32.CopyDataStruct )Marshal.PtrToStructure (lParam, typeof (Win32.CopyDataStruct));
string strData = Marshal.PtrToStringAnsi (st.lpData);
ChangeStyle (strData);
string[] arr = strData.Split (';');
break;
default:
break;
}
return IntPtr.Zero;
}


public struct COPYDATASTRUCT
{
public IntPtr dwData;
public int cbData;
[MarshalAs(UnmanagedType.LPStr)] public string lpData;
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
base.OnSourceInitialized (e);
HwndSource source = PresentationSource.FromVisual (this) as HwndSource;
source.AddHook (WndProc);
}
private void ChangeStyle(string str)
{
string stylesource = @"pack://siteoforigin:,,,/Vista" + str + ".xaml";
Application app = Application.Current;
ResourceDictionary rd = new ResourceDictionary ();
rd.Source = new Uri (stylesource, UriKind.Absolute);
app.Resources.MergedDictionaries.Add (rd);

}

}
}

[bdmh]

用api的
CreateFileMapping()
OpenFileMapping()