多个内存映射的文件被错误吗？
当向我的项目添加第二个内存映射文件时，第一个内存映射文件不再跨进程工作。
Imports System.IO.MemoryMappedFiles
Module IPC
Private ReadOnly _QlCtxOpen As MemoryMappedViewAccessor = MemoryMappedFile.CreateOrOpen("IPC_QlCtxOpen", 1).CreateViewAccessor()
Public Property IsQlCtxOpen As Boolean
Get
Dim value As Boolean = _QlCtxOpen.ReadBoolean(0)
Debug.Print($"QlCtxOpen {value}")
Return value
End Get
Set(ByVal value As Boolean)
_QlCtxOpen.Write(0, value)
Debug.Print($"set QlCtxOpen to {value}")
End Set
End Property
End Module
当向模块添加以下行时，第一个 mmf 仍然在同一进程中工作，但第二个进程将不再能够读取正确的值。
Private ReadOnly _alreadyOpenPID As MemoryMappedViewAccessor = MemoryMappedFile.CreateOrOpen("IPC_alreadyOpenPID", 4).CreateViewAccessor()
我知道我应该使用互斥体进行写入，但在我的项目中，写入是由鼠标操作触发的，因此只有 1 个进程会同时使用它。
我不明白我做错了什么来破坏第一个 mmf，它无需第二个 mmf 即可工作。
我正在使用 Microsoft Visual Studio Community 2019 版本 16.11.11 .NET Framework 4.7.2
when adding a second memory mapped file to my project the first one no longer works cross processes.
Imports System.IO.MemoryMappedFiles
Module IPC
Private ReadOnly _QlCtxOpen As MemoryMappedViewAccessor = MemoryMappedFile.CreateOrOpen("IPC_QlCtxOpen", 1).CreateViewAccessor()
Public Property IsQlCtxOpen As Boolean
Get
Dim value As Boolean = _QlCtxOpen.ReadBoolean(0)
Debug.Print(quot;QlCtxOpen {value}")
Return value
End Get
Set(ByVal value As Boolean)
_QlCtxOpen.Write(0, value)
Debug.Print(quot;set QlCtxOpen to {value}")
End Set
End Property
End Module
when adding following line to the module the first mmf still works in the same process but a second process will no longer be able to read the correct value.
Private ReadOnly _alreadyOpenPID As MemoryMappedViewAccessor = MemoryMappedFile.CreateOrOpen("IPC_alreadyOpenPID", 4).CreateViewAccessor()
I know i should use a mutex for writing but in my project the write is triggered by mouse action so only 1 process will use it at the same time.
I don't understand what i'm doing wrong to break the first mmf, it works w/o the second mmf.
I'm using Microsoft Visual Studio Community 2019
Version 16.11.11 .NET Framework 4.7.2
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事实证明，垃圾收集是这里的罪魁祸首。
要修复此行为，只要您需要其他进程读取值，请确保在内存映射文件中引用对内存映射的文件。
为什么它仍然只能使用1个声明，而对我的内存映射文件没有引用对我来说是个谜。
Turns out garbage collection is the culprit here.
To fix this behavior make sure to have a reference to the memory-mapped file for as long as you need the value to be read by other processes.
Why it still worked with only 1 declaration and no reference to the memory-mapped file is a mystery to me.