Unity进程间通信:共享内存

干货来了干货来了.之前做进程间通讯的时候,晚上查了很多资料,关于共享内存的资料很少,有的话也是说不能用.什么的.当然,那些都是好几年前的博客上边说的.现在随着c#的版本迭代.终于是可以支持了.当然 之前是不是真的不支持咱也无从考证,毕竟还年轻 哈哈哈

说起来代码也不多,不过经常做unity开发的很少会用到这种方式罢了.

共享内存支持unity与unity通讯,支持unity与winform通讯,速度快安全性高,

代码在家,晚点再补,先立下这个博客再说 哈哈哈 因为还要做测试的东西,毕竟写博客要认真负责.

先把代码贴出来 如果对你有用 不要忘了一键三连哟 点赞关注加收藏哈哈哈

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace SharedMMF
{
    class Sharedmm
    {
        [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 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 Sharedmm()
        {
        }
        ~Sharedmm()
        {
            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
        }

    }
}