Here’s a simple class that lets your app respond to a Keyspan remote (URM - 15T).

@interface KeyspanObserver : NSObject {

} @end

static NSDictionary *KeyspanActions = nil; static BOOL ShouldRespondToKeyspanActionsInBackground = NO;

@implementation KeyspanObserver

static BOOL KeyspanObserverAction(SEL action, NSResponder *responder, NSNotification *note, NSMethodSignature *delegateSignature) { if ([responder respondsToSelector:action]) { [responder performSelector:action withObject:note]; return YES; } id delegate; if ([responder respondsToSelector:@selector(delegate)] && responder methodSignatureForSelector:@selector(delegate)] isEqual:delegateSignature] && [(delegate = [responder performSelector:@selector(delegate)]) respondsToSelector:action]) { [delegate performSelector:action withObject:note]; return YES; } return NO; }

• ([[NSResponder *)firstResponder { NSResponder *firstResponder = [[NSApp keyWindow] firstResponder]; NSArray *orderedWindows; if (!firstResponder && [(orderedWindows = [NSApp orderedWindows]) count]) firstResponder = [(NSWindow *)[orderedWindows objectAtIndex:0] firstResponder]; return firstResponder; }

• (void)keyspanMessage:(NSNotification *)note {

  if (![NSApp isActive] && !ShouldRespondToKeyspanActionsInBackground) return;

  NSString *message = note userInfo] objectForKey:@”message”]; if ([message isKindOfClass:[[[NSString class]]) { SEL action = NSSelectorFromString([KeyspanActions objectForKey:message]); NSResponder *responder; NSMethodSignature *sig = [NSWindow instanceMethodSignatureForSelector:@selector(delegate)]; if (action) { BOOL didHandle = NO; for (responder = [self firstResponder]; responder && !(didHandle = KeyspanObserverAction(action, responder, note, sig)); responder = [responder nextResponder]); if (!didHandle) KeyspanObserverAction(action, NSApp, note, sig); } }

}

• (void)initialize { if (!KeyspanActions) { [[NSDistributedNotificationCenter defaultCenter] addObserver:self selector:@selector(keyspanMessage:) name:@”com.Keyspan.DMR.IAC.notification” object:@”button”]; ShouldRespondToKeyspanActionsInBackground = ([[NSUserDefaults standardUserDefaults] objectForKey:@”ShouldRespondToKeyspanActionsInBackground”]) ? YES : NO; KeyspanActions = [[NSDictionary alloc] initWithObjectsAndKeys: @”keyspanRemoteSelectButtonDown:”, @”DWN SELECT”, @”keyspanRemoteSelectButtonUp:”, @”UPP SELECT”, @”keyspanRemoteCycleButtonDown:”, @”DWN CYCLE”, @”keyspanRemoteCycleButtonUp:”, @”UPP CYCLE”, @”keyspanRemoteMuteButtonDown:”, @”DWN MUTE”, @”keyspanRemoteMuteButtonUp:”, @”UPP MUTE”, @”keyspanRemoteLeftArrowButtonDown:”, @”DWN ARROW_LEFT”, @”keyspanRemoteLeftArrowButtonUp:”, @”UPP ARROW_LEFT”, @”keyspanRemoteRightArrowButtonDown:”, @”DWN ARROW_RIGHT”, @”keyspanRemoteRightArrowButtonUp:”, @”UPP ARROW_RIGHT”, @”keyspanRemoteDownArrowButtonDown:”, @”DWN ARROW_DN”, @”keyspanRemoteDownArrowButtonUp:”, @”UPP ARROW_DN”, @”keyspanRemoteArrowButtonDown:”, @”DWN ARROW_UP”, @”keyspanRemoteUpArrowButtonUp:”, @”UPP ARROW_UP”, @”keyspanRemoteVolumeDownButtonDown:”, @”DWN VOL_DN”, @”keyspanRemoteVolumeDownButtonUp:”, @”UPP VOL_DN”, @”keyspanRemoteVolumeUpButtonDown:”, @”DWN VOL_UP”, @”keyspanRemoteVolumeUpButtonUp:”, @”UPP VOL_UP”, @”keyspanRemotePauseButtonDown:”, @”DWN PAUSE”, @”keyspanRemotePauseButtonUp:”, @”UPP PAUSE”, @”keyspanRemoteNextTrackButtonDown:”, @”DWN NEXT_TRK”, @”keyspanRemoteNextTrackButtonUp:”, @”UPP NEXT_TRK”, @”keyspanRemoteFastForwardButtonDown:”, @”DWN FAST_FWD”, @”keyspanRemoteFastForwardButtonUp:”, @”UPP FAST_FWD”, @”keyspanRemoteRewindButtonDown:”, @”DWN REWIND”, @”keyspanRemoteRewindButtonUp:”, @”UPP REWIND”, @”keyspanRemotePreviousTrackButtonDown:”, @”DWN PREV_TRK”, @”keyspanRemotePreviousTrackButtonUp:”, @”UPP PREV_TRK”, @”keyspanRemoteStopButtonDown:”, @”DWN STOP”, @”keyspanRemoteStopButtonUp:”, @”UPP STOP”, @”keyspanRemotePlayButtonDown:”, @”DWN PLAY”, @”keyspanRemotePlayButtonUp:”, @”UPP PLAY”, nil]; } [super initialize]; } @end

The responder chain is searched first for an action handler. If the responder chain doesn’t handle the action, NSApp and its delegate get a shot at it.

You can have a document object, an app delegate or a responder object handle remote button actions.

• (void)keyspanRemotePlayButtonUp:(NSNotification *)note { NSLog(@”<%p>%s:”, self, PRETTY_FUNCTION); }

• (void)keyspanRemotePlayButtonDown:(NSNotification *)note { NSLog(@”<%p>%s:”, self, PRETTY_FUNCTION); }

• (void)keyspanRemoteStopButtonUp:(NSNotification *)note { NSLog(@”<%p>%s:”, self, PRETTY_FUNCTION); }
• (void)keyspanRemoteStopButtonDown:(NSNotification *)note { NSLog(@”<%p>%s:”, self, PRETTY_FUNCTION); }

–zootbobbalu