QWidget:Must construct a QApplication before a QPaintDevice
2017-01-10 00:00
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即:QWidget:必须构造一个QApplication QPaintDevice之前
解决方案:在main函数中添加相应程序,如下
解决方案:在main函数中添加相应程序,如下
#include <QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); ... return a.exec(); }
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