问题
How many messages does the queue for a standard window hold? What happens when the queue overflows?
The documentation for GetMessage and relatives doesn't say anything about this, and PeekMessage only gives you a yes/no for certain classes of messages, not a message count.
This page says that the queues are implemented using memory-mapped files, and that there is no message count limit, but that page is about WinCE. Does this apply to desktop Win32 as well?
回答1:
10000 by default, but it can be adjusted via the registry.
If queue overflows, PostMessage fails.
Documentation here:
PostMessage function on MSDN
回答2:
As stated in the MSDN article, if you need to worry about the size of the message queue, you might be better off redesigning your application.
来源：https://stackoverflow.com/questions/123323/how-deep-is-the-win32-message-queue