使用GetKeyState（） [英] Using GetKeyState()

问题描述

当按下一个键时，我想要一个布尔事件切换。具体来说，'s'键。我已经指向函数GetKeyState（），它应该在Win32 API下工作。我知道字母's'的ASCII代码是115，因此我的代码如下：

I would like to have a boolean event toggle when a key is pressed. Specifically, the 's' key. I have been pointed to the function GetKeyState(), which supposedly works under the Win32 API. I understand the ASCII code for the letter 's' is 115, and so my code is as follows:

if (GetKeyState(115) == 1)
{
<EVENT>
}

但是，这不起作用。为什么？以下是MSDN参考资料： http://msdn.microsoft.com/ en-us / library / ms646301％28v = vs.85％29.aspx ...如果低位是1，键将被切换

However, this does not work. Why? Here is the MSDN reference: http://msdn.microsoft.com/en-us/library/ms646301%28v=vs.85%29.aspx ... "If the low-order bit is 1, the key is toggled"

推荐答案

根据我的理解，您需要：

From what I understand you need to do:

if( GetKeyState(115) & 0x8000 )
{
    <EVENT>
}

最高位指示是否按下键。最低值表示键是否被切换（例如，如果大写锁定已打开）。

The highest bit tells if key is pressed. The lowest tells if key is toggled (like, if caps lock is turned on).

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