C#不通过byte[]，直接对内存映射文件复制内存

背景

多个进程直接需要传递大量图片，所以对性能要求较高。支付复制内存显然比转成byte[]再复制优越。

命名空间

using System;
 using System.Diagnostics;
 using System.Runtime.InteropServices;

代码

public CMainTestForm()
         {
             InitializeComponent();
             WriteIntToMemFile(34);
         }        static unsafe void WriteIntToMemFile(int i)
         {
             using (var mmf = System.IO.MemoryMappedFiles.MemoryMappedFile.CreateNew("HZD20230925", 42))
             using (var view = mmf.CreateViewAccessor())
             {
                 byte* poke = null;
                 view.SafeMemoryMappedViewHandle.AcquirePointer(ref poke);
                 CopyMemory(new System.IntPtr(poke), new System.IntPtr(&i), sizeof(int));
                 view.SafeMemoryMappedViewHandle.AcquirePointer(ref poke);
                 int iRead = view.ReadInt32(0);
                 Debug.Assert(iRead == i);
             }
         }        [DllImport("kernel32.dll", EntryPoint = "RtlMoveMemory", CharSet = CharSet.Ansi)]
         public extern static long CopyMemory(IntPtr dest, IntPtr source, int size);

测试环境

Win7 VS2022