正如其他人所说，没有跨平台的方法可以做到这一点，但在 Windows 上你可以这样做:

As mentioned by others there's no cross platform way to do this, but on Windows you can do it like this:

下面的代码检查A"键是否按下.

The Code below checks if the key 'A' is down.

if(GetKeyState('A') & 0x8000/*Check if high-order bit is set (1 << 15)*/)
{
    // Do stuff
}

如果发生轮班或类似情况，您需要通过以下其中一项:https://msdn.microsoft.com/de-de/library/windows/desktop/dd375731(v=vs.85).aspx

In case of shift or similar you will need to pass one of these: https://msdn.microsoft.com/de-de/library/windows/desktop/dd375731(v=vs.85).aspx

if(GetKeyState(VK_SHIFT) & 0x8000)
{
    // Shift down
}

低位表示按键是否被切换.

The low-order bit indicates if key is toggled.

SHORT keyState = GetKeyState(VK_CAPITAL/*(caps lock)*/);
bool isToggled = keyState & 1;
bool isDown = keyState & 0x8000;

哦，别忘了

#include <Windows.h>