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Qt5.6 支持高分辨率,创建 QApplication 前加入特定代码即可。高分辨电脑需注意:别混用获取尺寸位置 API,nativeEvent 中 MSG 的 x,y 坐标需除以缩放比获取正确值。- Published on
介绍 Windows7 下硬盘安装 Ubuntu10.04 教程,需先下载安装 EasyBCD_1.7.2,复制文件并解压,通过 EasyBCD 操作,在 menu.lst 输入内容,重启后选择 NeoGrub Bootloader 进入光盘系统,按步骤安装,成功后可出现 Windows7 引导菜单。- Published on
文章介绍让程序只有一个实例运行的方法,开始加代码实现。有三种:一是找先前窗口实例并激活;二是用互斥对象,创建后判断是否已存在;三是用事件对象,创建后判断是否已存在,若已存在则直接返回。(迁移 2011 - 05 - 28)- Published on
文章介绍了进程或线程同步互斥的四种控制方法:临界区速度快可串行化访问公共资源;互斥量可跨进程控制资源访问;信号量允许多线程同时访问有限资源;事件可通知线程同步。并分别给出各方法的操作原语及 MFC 类的使用示例,还通过实例展示了临界区和事件的用法。