CGError CGSGetWorkspace(CGSConnectionID cid, CGSWorkspaceID *outWorkspace);
extern bool CoreDockGetWorkspacesEnabled();
extern void CoreDockGetWorkspacesCount(int *rows, int *columns);

- (void)switchToSpace:(CGSWorkspaceID)spaceNumber {
  // note that the notification is 1 based, but CGSWorkspaceID is zero based!
  [[NSDistributedNotificationCenter defaultCenter] postNotificationName:@"com.apple.switchSpaces"
                                                                 object:[NSString stringWithFormat:@"%i", spaceNumber + 1]];
}

//! Gets called when the current space changes.
void SpaceChangedCallback(CGSNotificationType type, CGSWorkspaceID *workspace, unsigned int dataLength, Controller *self) {
  if(*workspace != kCGSTransitioningWorkspaceID) {
    // do something
  }
}
 
//! Gets called when the user enables or disables Spaces.
- (void)spacesEnabledChanged:(NSNotification *)notification {
  // do something
}
 
//! Start listening for workspace related changes.
- (void)registerForNotifications {
  // listen for when Spaces is enabled or disabled
  [[NSDistributedNotificationCenter defaultCenter] addObserver:self
                                                      selector:@selector(spacesEnabledChanged:)
                                                          name:@"SpacesEnableChange"
                                                        object:nil
                                            suspensionBehavior:NSNotificationSuspensionBehaviorDeliverImmediately];
 
  // listen for when the current space changes
  CGSRegisterNotifyProc((CGSNotifyProcPtr)SpaceChangedCallback, kCGSNotificationWorkspaceChanged, self);
}