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    <p>I do this by subclassing NSApplication (and setting that class as the application class in my target's info) with the following:</p> <pre><code>#import &lt;IOKit/hidsystem/ev_keymap.h&gt; </code></pre> <p>...</p> <pre><code>- (void)mediaKeyEvent:(int)key state:(BOOL)state { switch (key) { // Play pressed case NX_KEYTYPE_PLAY: if (state == NO) [(TSAppController *)[self delegate] togglePlayPause:self]; break; // FF pressed case NX_KEYTYPE_FAST: if (state == YES) [(TSAppController *)[self delegate] seekForward:self]; break; // RW pressed case NX_KEYTYPE_REWIND: if (state == YES) [(TSAppController *)[self delegate] seekBack:self]; break; } } - (void)sendEvent:(NSEvent *)event { // Catch media key events if ([event type] == NSSystemDefined &amp;&amp; [event subtype] == NX_SUBTYPE_AUX_CONTROL_BUTTONS) { int keyCode = (([event data1] &amp; 0xFFFF0000) &gt;&gt; 16); int keyFlags = ([event data1] &amp; 0x0000FFFF); int keyState = (((keyFlags &amp; 0xFF00) &gt;&gt; 8)) == 0xA; // Process the media key event and return [self mediaKeyEvent:keyCode state:keyState]; return; } // Continue on to super [super sendEvent:event]; } </code></pre> <p>The "state" in -mediaKeyEvent:state: is for up/down. In my app it makes sense to only react to the play/pause key when it's back up (done pressing), but I continuously react to RW/FF events while the key is down for seeking.</p> <p>I'd love to know of a better way to do this if it exists, though. Currently, unless the user disables these keys in the global keyboard shortcuts, it controls my app <em>and</em> iTunes. :-)</p> <p>This code has been used quite awhile in my <a href="http://bartastechnologies.com/transcriva" rel="noreferrer">transcription app</a> and works well (aside from the global keyboard shortcut issue above).</p>
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    1. COBrrr, magic numbers. You may be interested in `NX_SUBTYPE_AUX_CONTROL_BUTTONS` and `NX_KEYUPMASK`/`NSKeyUpMask` (the latter being `0x800` in the `keyFlags` variable).
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      1. USPeter Hosey
    2. COYeah, I was going to mention that very phrase but thought the "better way" encompassed it. :-) Thanks for the constants.
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      1. USJoshua Nozzi
    3. CORegisterEventHotKey may let you claim control of these hotkeys? If you register a hotkey like Cmd+Space, you can stop it being handled by Dock as well as your app.
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      1. USNicholas Wilson
 

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