Mac OS X - 获取空格键的状态 [英] Mac OS X - Get state of spacebar

问题描述

在 Mac 上，我如何知道键盘上的某个键是按下/向下还是未按下/向上?现在我需要它作为空格键，但适用于任何键的答案将是完美的.

How do I know whether a certain key on the keyboard is pressed/down or unpressed/up on Mac? Right now I need it for the spacebar, but an answer that would work for any key would be perfect.

我不想检测事件:

-(void)keyDown:(NSEvent*)event;
-(void)keyUp:(NSEvent*)event;

我想要某个时刻某个键(空格键)的状态.

I want the state of a key (spacebar) at a certain moment.

在 Windows 上，这似乎是可能的(虽然我还没有尝试过)，使用以下代码:

On Windows this seems possible (although I haven't tried it out) with the following code:

GetAsyncKeyState(VK_SPACE);

但我还没有找到适用于 Mac 的解决方案.

But I haven't found a solution for Mac yet.

推荐答案

我找到了答案 这里.这是我使用的工作片段:

I found an answer here. This is the working snippet that I used:

#include <Carbon/Carbon.h>

Boolean isPressed( unsigned short inKeyCode )
{
    unsigned char keyMap[16];
    GetKeys((BigEndianUInt32*) &keyMap);
    return (0 != ((keyMap[ inKeyCode >> 3] >> (inKeyCode & 7)) & 1));
}

inKeyCode 代表你想知道它是否被按下的键.您可以在 Mac 上的以下文件中找到键到 unsigned short 的映射:

inKeyCode represents the key of which you want to know whether it is pressed or not. A mapping of keys to unsigned shorts can be found in the following file on your Mac:

/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/Headers/Events.h

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