原文地址::https://blog.csdn.net/z278930050/article/details/51496856
QString str = QString("%1").arg(outChar&0xFF,2,16,QLatin1Char('0'));
int a=0001;
QString str = QString("%1").arg(a,4,10,QLatin1Char('0'));
原文地址:http://www.cnblogs.com/luxiaolai/p/3723946.html