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此问题与此问题的代码有关:检测OS X中的耳机按钮按下

他们的回答是正确的,但我无法让他们的代码工作(这可能是因为我缺乏对Objective-c的了解).我按照他们的指示,修改了三个文件.这是我尝试过的(我也查看了Apple的IOKit文档,找不到任何耳机硬件按钮文档):

AwesomeClass.h

#import <Cocoa/Cocoa.h>
#include "KeyboardPaneController.h"

@interface AwesomeClass : KeyboardPaneController
+ (NSArray *) allKeyboards;
- (void) initKeyboardElements: (NSArray *) elements;
- (void) ddhidQueueHasEvents: (DDHidQueue *) hidQueue;
@end

AwesomeClass.m

#import "AwesomeClass.h"
#import "DDHidLib.h"

@implementation AwesomeClass

+ (NSArray *) allKeyboards;
{
    NSArray *array = [DDHidDevice allDevicesMatchingUsagePage: kHIDPage_Consumer
                                                      usageId: kHIDUsage_GD_Pointer
                                                    withClass: self
                                            skipZeroLocations: NO];

    //Only return "Apple Mikey HID Driver", if not found, return nil.
    for (DDHidDevice *device in array) {
        if ([[device productName] isEqualToString:@"Apple Mikey HID Driver"]) {
            return …