動態匯入QCAR資料庫

（尚未實際測試）
just download that file from network, store it within application directories and load it like the sample data bundled with the app

NSString * pathToDownloadedFile; //should have path to your file

QCAR::DataSet *dataSet = nil;
QCAR::TrackerManager& trackerManager = QCAR::TrackerManager::getInstance();
QCAR::ImageTracker* imageTracker = static_cast<QCAR::ImageTracker*>    (trackerManager.getTracker(QCAR::Tracker::IMAGE_TRACKER));
dataSet = imageTracker->createDataSet();
dataSet->load([pathToDownloadedFile cStringUsingEncoding:NSASCIIStringEncoding], QCAR::DataSet::STORAGE_ABSOLUTE);


imageTracker->activateDataSet(dataSet);