解决QWidget: Cannot create a QWidget when no GUI is being used
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长时间不用Qt了，新建了个控制台工程再添加自己的类，即是不想使用designer来设计自己的界面，编译时没有错误，执行时出现QWidget: Cannot create a QWidget when no GUI is being used，原来是因为QCoreApplication的问题，把它改成QApplication就OK了。
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