C++ 控制台键盘事件
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C++ console keyboard events
提问by Cassidy Laidlaw
Is there any way to get key events in a Windows console? I need a way to get keydown and keyup events quickly without a GUI. I've tried using getch(), but it doesn't get keyups and waits until a key has been pressed to return.
有没有办法在 Windows 控制台中获取关键事件？我需要一种无需 GUI 即可快速获取 keydown 和 keyup 事件的方法。我试过使用 getch()，但它没有获得 keyups 并等待直到按下某个键才返回。
采纳答案by John Knoeller
You can use GetKeyStateor GetAsyncKeyState, but that won't give you keydown/keyup events. It will only tell you what keys are currently down.
您可以使用GetKeyState或GetAsyncKeyState，但这不会为您提供 keydown/keyup 事件。它只会告诉您当前关闭了哪些键。
So if you really need to get the keydown/keyup events, you could install a hook. A Console window has a window handle that is owned by code in Windows and a message pump, also owned by code in Windows.
所以如果你真的需要获取 keydown/keyup 事件，你可以安装一个钩子。控制台窗口有一个由 Windows 中的代码拥有的窗口句柄和一个消息泵，它也由 Windows 中的代码拥有。
You can get the window handle of of the console window by using GetConsoleWindowThen install a WH_CALLWNDPROChook using SetWindowsHookExto listen in on messages send to the console window.
您可以使用GetConsoleWindow获取控制台窗口的窗口句柄，然后WH_CALLWNDPROC使用SetWindowsHookEx安装一个钩子来监听发送到控制台窗口的消息。
You might try a WH_MSGFILTERhook instead. I don't know if this works for console windows, but it would generate less messages to be ignored if it does work.
你可以试试WH_MSGFILTER钩子。我不知道这是否适用于控制台窗口，但如果它有效，它会生成更少的消息被忽略。
回答by Seva Alekseyev
Use ReadConsoleInput()API. Watch for events of kind KEY_EVENT. This won't work for all keydown events (Ctrl-key, shift-key, Pause-key cannot be read), but most can be read.
使用ReadConsoleInput()API。注意事件的种类KEY_EVENT。这不适用于所有 keydown 事件（Ctrl-key、shift-key、Pause-key 无法读取），但大多数都可以读取。
Use GetNumberOfConsoleInputEventsto avoid blocking.
使用GetNumberOfConsoleInputEvents以避免阻塞。
回答by Moisei
I was just curious, how comes such a logical question doesn't have any explanation on Google, So one has to ask it here. So I googled for: "keyboard events console application"and guess what ... first 2 links are interesting (but unfortunately, not exactly answers to your question):
我只是好奇，这样一个合乎逻辑的问题怎么在谷歌上没有任何解释，所以必须在这里问。所以我用谷歌搜索：“键盘事件控制台应用程序”并猜测......前2个链接很有趣（但不幸的是，不完全回答你的问题）：
- Processing mouse / keyboard input on MSDN.
- Console event handlers(like Ctrl-C and window close button).
- 在 MSDN 上处理鼠标/键盘输入。
- 控制台事件处理程序（如 Ctrl-C 和窗口关闭按钮）。
回答by Jerry Coffin
There are a number of ways. GetKeyboardState would be one of the most obvious.
有多种方法。GetKeyboardState 将是最明显的之一。
回答by kuba
You can also try SetConsoleCtrlHandler
你也可以试试 SetConsoleCtrlHandler
