QT 跨线程发送信号非元数据信号解决

参考博客：

http://qimo601.iteye.com/blog/1673578

http://blog.csdn.net/luotuo44/article/details/39395025

http://blog.csdn.net/seanyxie/article/details/7025183

http://www.devbean.net/2013/12/qt-study-road-2-thread-and-qobject/