how to use Armature FrameEventSignal?

example:
cs::ArmatureDataManager::sharedArmatureDataManager()->addArmatureFileInfo(“warrior”,“”, “texture.png”,“texture.plist”, “skeleton.xml”);

cs::Armature **armature1 =NULL;
armature1 =cs::Armature::create;//读取Armature_data
armature1->getAnimation~~>play;//播放第几个动作
armature1~~>getAnimation->FrameEventSignal.connect;

void HelloWorld::onFrameEvent
{
CCLog;//** not work this line.*
}