Qt 设置窗口初始位置居中时出错: member access into incomplete type

//将窗口移动到屏幕中间 w.move ((QApplication::desktop()->width() - w.width())/2,(QApplication::desktop()->height() - w.height())/2);web 错误描述: member access into incomplete type svg 解决方案: 加入头文件 QDesktopWidget3d
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