QT 多线程 主次线程之间的通信实例，用于图像事务处理，Qt4 版本-QT multi-threaded communication between primary and secondary threads instance, for image transaction processing（TransactionThread), Qt4 version

非常实用的QT界面编程实例，实现了利用线程编程和进度条功能,相信对大家一定会有帮助的-Very practical instances of QT interface programming, the realization of the function of using thread programming and the progress bar, believe that will be helpful to all of you!!!!!!!!!!!