windows 事件可以是进程间的吗？
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Can Events be Inter-Process?
提问by Mike Trader
I have created an event in one process and to test, sent the event handle via a pipe to a totally separate process (not a child thread)
我在一个进程中创建了一个事件并进行测试，通过管道将事件句柄发送到一个完全独立的进程（不是子线程）
When I fire the event in the first, WaitForSingleObject does not detect the event so I am guessing the answer is no unless I missed some trick in the SECURITY_ATTRIBUTES structure?
当我在第一个触发事件时，WaitForSingleObject 没有检测到该事件，所以我猜答案是否定的，除非我错过了SECURITY_ATTRIBUTES 结构中的一些技巧？
Or perhaps I need to use a named event and call OpenEvent()?
或者我可能需要使用命名事件并调用 OpenEvent()？
In this case I cannot use window messages because I am trying to signal a windows service. I could use the pipe, but there will be many of these applications, and I would like to find a "low cost" solution if possible.
在这种情况下，我无法使用窗口消息，因为我正在尝试向 Windows 服务发出信号。我可以使用管道，但是会有很多这样的应用程序，如果可能的话，我想找到一个“低成本”的解决方案。
Other options like Memory mapped files have even more overhead than the pipe?
其他选项（例如内存映射文件）的开销甚至比管道还要多？
How would you do this?
你会怎么做？
采纳答案by i_am_jorf
回答by Mike Trader
Yes this works:
是的，这有效：
#COMPILE EXE "NamedEvent.exe"
#INCLUDE "win32api.inc"
%EVENT_ALL_ACCESS = &h0001F0003
FUNCTION PBMAIN() AS LONG
LOCAL lRet AS LONG, lError AS LONG, lEventName AS ASCIIZ * %MAX_PATH
lEventName = "TestEvent"
lRet = CreateEvent (BYVAL %NULL, %False, %False, lEventName)
lError = GetLastError ()
IF ISFALSE lRet THEN
MSGBOX "Unable to create Event, error:" + STR$(lError),,"CreateEvent error"
ELSE
IF lError = %ERROR_ALREADY_EXISTS THEN
lRet = OpenEvent(BYVAL %EVENT_ALL_ACCESS, %False, lEventName)
lError = GetLastError()
IF lRet THEN
MSGBOX "Opened existing Event, handle:" + STR$(lRet),,"OpenEvent:"
ELSE
MSGBOX "Unable to open Event, error:" + STR$(lError),,"OpenEvent error" : EXIT FUNCTION
END IF
ELSE
MSGBOX "Created new Event, handle:" + STR$(lRet),,"CreateEvent:"
END IF
END IF
END FUNCTION
In general, what has a lower overhead:
一般来说，开销较低的方法是：
Pipes (assuming small size specified)
管道（假设指定的小尺寸）
MemMapFiles
内存映射文件
Events
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