QT如何实现后台运行即最小化到右下角托盘 How does QT run in the background (ie minimize to the bottom right corner of the tray)
Qt常用类 qt常用类判断:boolisDigit()const;//判断是否是十进制数字('0'-'9')boolisLetter()const;//判断是否是字??boolisLetterOrNumber()const;//判断力是否是字母或数??boolisLower()const;判断是否是小写字??b