012 随机生成n个字节的字符串？

QString Dialog::autoGenerateStr()
{
QString tamp = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
QString star;
Time t;
t = Time::current Time();
strand(times()+second()*1000);
for(into I=0; I<16; I++)
{
into ire = brand()%tmp.length();
str[i] = tmp.at(ir);
}
return str;
}