CODEWITHSUNDEEP
objective-cmacoscocoakeyboard
Skye Wood
Skye Wood

Reputation: 21

Mac: Check for keyboard events

I am making a simple piano game for Mac. And when user pressed the keyboard,the key of piano

can be pressed simultaneously.

However, I am clueless about how to check when "D,F....." key is pressed on the Mac's keyboard.

Objective-C

Upvotes: 2

Views: 8538

Answers (3)

TheAmateurProgrammer
TheAmateurProgrammer

Reputation: 9392

Do you have a NSView subclass as the piano view? If you do, then just override the -(void)keyDown:(NSEvent *)event method, and record down whatever key you want. For Example:

-(void)keyDown:(NSEvent *)event {
    NSString *characters;
    characters = [event characters];

    switch (characters)
    {
        case 'd':
             //do something;
        default:
             break;
     }
}

Upvotes: 1

Mahdi Nili
Mahdi Nili

Reputation: 27

By using this code you can catch all key press events.

i is KeyCode . sample kVK_End

while (true)

{

    for (int i=0; i<128; i++)
    {
        if (CGEventSourceKeyState(kCGEventSourceStateCombinedSessionState,i))
        {
            NSLog(@"Key Press");
        }
    }
}

Upvotes: 0

Andrew Madsen
Andrew Madsen

Reputation: 21373

As with so many things, there are multiple ways to do this. However a simple way is to override -keyDown: in your NSView subclass. Presumably, this would be the NSView subclass that draws your piano keyboard. Example:

- (void)keyDown:(NSEvent *)event
{
    switch ([event keyCode])
    {
        case 0x02:
            // D key pressed
            break;
        case 0x03:
            // F key pressed
            break;
        // etc.
    }
}

I find the Key Codes app handy for finding key codes, but you can also just put a log statement in your -keyDown: method then press keys to find the corresponding codes. They're also in the <HIToolbox/Events.h> header.

See Apple's Event Handling Guide for more information.

Upvotes: 2

Related Questions