使用GetKeys函数获取键盘状态 [英] Getting keyboard state using GetKeys function

问题描述

有人知道如何通过GetKeys函数获取任何键状态（按下或否）吗？
换句话说，该函数的处理方式：

Does anyone know how to get any key state (pressed or no) by GetKeys function? In other words how to handle this function:

bool result = isPressed(kVK_LeftArrow);

谢谢。

推荐答案

KeyMap 类型是整数数组，但其实际布局是一系列位，每个键代码一个。特定密钥的位数比虚拟密钥代码少 。

The KeyMap type is an array of integers but its real layout is a series of bits, one per key code. The bit number for a particular key is one less than the virtual key code.

因为对于很大的值，移位是不合法的（例如，您不能只要求编译器移位74位）， KeyMap 类型分为4部分。您需要使用虚拟键控代码的位数，然后将整数除以32，以找到该位数的正确整数；然后用其余的值找出应该设置的位。

Since bit-shifting isn't legal for very large values (e.g. you can't just ask the compiler to shift 74 bits), the KeyMap type is broken into 4 parts. You need to take the virtual key code's bit number and integer-divide by 32 to find the correct integer for the bit; then take the remainder to figure out which bit should be set.

因此，请尝试以下操作：

So, try this:

uint16_t vKey = kVK_LeftArrow;
uint8_t index = (vKey - 1) / 32;
uint8_t shift = ((vKey - 1) % 32);
KeyMap keyStates;
GetKeys(keyStates);
if (keyStates[index] & (1 << shift))
{
    // left arrow key is down
}

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