Error: QWidget: Cannot create a QWidget without QApplication
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自己在新建QT工程时,没有选择Qt Widgets应用,而是选择Qt 控制台程序:
(现在还不清楚这些具体各个应用程序的区别)
结果自己在建主窗口程序时,出现下面的错误(QWidget: Cannot create a QWidget without QApplication):
产生这个错误的原因是这个QWidget 是建立在QApplication 上的,(From the docs, the QApplication class manages the GUI application's control flow and main settings whilst the QCoreApplication class provides an event loop for console Qt applications),改成下面的代码就行了:
参考:
【1】 解决QWidget: Cannot create a QWidget when no GUI is being used http://blog.csdn.net/muyuyuzhong/article/details/7034301
【2】Qt - QWidget: Cannot create a QWidget when no GUI is being used http://stackoverflow.com/questions/5521752/qt-qwidget-cannot-create-a-qwidget-when-no-gui-is-being-used
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