C#中如何创建共享内存,然后进程之间通信?
C#中如何创建共享内存,然后进程之间通信?最好能有实例代码. --------------------编程问答-------------------- 可以用AutoResetEvent类 --------------------编程问答-------------------- 进程之间的通讯倒是一个比较复杂的课题，我没有研究过。
但是可以利用System.Xml.Serialization 把数据对象 序列化成为xml文件，通过文件达到共享数据的目的！ --------------------编程问答-------------------- 调用API函数 CreateFileMapping, MapViewOfFile --------------------编程问答-------------------- 关注 --------------------编程问答-------------------- 三个方法吧。
一是共享文件，每个进程都去读写同一个文件，用来实现数据的共享。
二是利用数据库。
三是利用socket，每个进程通过socket来连接，相互发送数据。
--------------------编程问答-------------------- 参考C++的做法 --------------------编程问答-------------------- Mark --------------------编程问答-------------------- 进程间通行最方便是通过消息：WM_COPYDATA --------------------编程问答-------------------- 远程调用也可以 --------------------编程问答-------------------- 使用内存文件的一个例子,在这个例子中,内存文件里存放的是主窗口的句柄.
(ApiShell是我收集Api函数和常量的声明,你可以自行声明.)
static void Main()
{
IntPtr hMemoryFile;
IntPtr hMapView;
Process current = Process.GetCurrentProcess();
Process[] processes = Process.GetProcessesByName(current.ProcessName);
foreach (Process process in processes)
{
if (process.Id != current.Id)
{
if (process.MainModule.FileName == current.MainModule.FileName)
{
hMemoryFile = ApiShell.OpenFileMapping(ApiShell.PAGE_READWRITE, false, process.Id.ToString());
hMapView = ApiShell.MapViewOfFile(hMemoryFile, ApiShell.FILE_MAP_READ, 0, 0, 8);
IntPtr hwnd = Marshal.ReadIntPtr(hMapView);
ApiShell.UnmapViewOfFile(hMapView);
ApiShell.CloseHandle(hMapView);
ApiShell.ShowWindow(hwnd, ApiShell.SW_SHOWNORMAL);
ApiShell.UpdateWindow(hwnd);
return;
}
}
}
Form1 frm = new Form1();
hMemoryFile = ApiShell.CreateFileMapping(ApiShell.INVALID_HANDLE_VALUE, IntPtr.Zero, ApiShell.PAGE_READWRITE, 0, 8, current.Id.ToString());
hMapView = ApiShell.MapViewOfFile(hMemoryFile, ApiShell.FILE_MAP_WRITE, 0, 0, 8);
Marshal.WriteIntPtr(hMapView, frm.Handle);
ApiShell.UnmapViewOfFile(hMapView);
ApiShell.CloseHandle(hMapView);
Application.Run(frm);
ApiShell.CloseHandle(hMemoryFile);
}
--------------------编程问答-------------------- 进程间通讯用IPC啊。如果你愿意用.NET 3.0 WCF，那是最简单的，用NamedPipeBinding就好了 --------------------编程问答-------------------- .net上用管道通讯，Remoting。
--------------------编程问答--------------------
using System;--------------------编程问答-------------------- 路过学习~
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(ref 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
}
}
}
补充：.NET技术 , C#
