Question

我刚刚使用以下代码（来源：https://stackoverflow.com/a/10520629/1213411）来播放/暂停音乐。现在我想跳过当前曲目并跳过下一首曲目。所以我使用代码HIDPostAuxKey(NX_KEYTYPE_NEXT);来做到这一点。但这似乎不起作用？有谁知道为什么这不起作用？

提前致谢！

// Save as sound_up.m
// Compile: gcc -o sound_up sound_up.m -framework IOKit -framework Cocoa

#import <Cocoa/Cocoa.h>
#import <IOKit/hidsystem/IOHIDLib.h>
#import <IOKit/hidsystem/ev_keymap.h>


static io_connect_t get_event_driver(void)
{
    static  mach_port_t sEventDrvrRef = 0;
    mach_port_t masterPort, service, iter;
    kern_return_t    kr;

    if (!sEventDrvrRef)
    {
        // Get master device port
        kr = IOMasterPort( bootstrap_port, &masterPort );
        check( KERN_SUCCESS == kr);

        kr = IOServiceGetMatchingServices( masterPort, IOServiceMatching( kIOHIDSystemClass ), &iter );
        check( KERN_SUCCESS == kr);

        service = IOIteratorNext( iter );
        check( service );

        kr = IOServiceOpen( service, mach_task_self(),
                            kIOHIDParamConnectType, &sEventDrvrRef );
        check( KERN_SUCCESS == kr );

        IOObjectRelease( service );
        IOObjectRelease( iter );
    }
    return sEventDrvrRef;
}


static void HIDPostAuxKey( const UInt8 auxKeyCode )
{
  NXEventData   event;
  kern_return_t kr;
  IOGPoint      loc = { 0, 0 };

  // Key press event
  UInt32      evtInfo = auxKeyCode << 16 | NX_KEYDOWN << 8;
  bzero(&event, sizeof(NXEventData));
  event.compound.subType = NX_SUBTYPE_AUX_CONTROL_BUTTONS;
  event.compound.misc.L[0] = evtInfo;
  kr = IOHIDPostEvent( get_event_driver(), NX_SYSDEFINED, loc, &event, kNXEventDataVersion, 0, FALSE );
  check( KERN_SUCCESS == kr );

  // Key release event
  evtInfo = auxKeyCode << 16 | NX_KEYUP << 8;
  bzero(&event, sizeof(NXEventData));
  event.compound.subType = NX_SUBTYPE_AUX_CONTROL_BUTTONS;
  event.compound.misc.L[0] = evtInfo;
  kr = IOHIDPostEvent( get_event_driver(), NX_SYSDEFINED, loc, &event, kNXEventDataVersion, 0, FALSE );
  check( KERN_SUCCESS == kr );

}

int main(int argc, char *argv[]) {
  HIDPostAuxKey(NX_KEYTYPE_SOUND_UP);
}

Answer 1

您可能已经发现了这一点，但如果您使用NX_KEYTYPE_FAST而不是NX_KEYTYPE_NEXT，它就会有效。

使用媒体键跳过曲目

1 个答案: