Qt 随机数

2016-03-31 本文已影响0人厝弧

相关函数

qsrand(unsigned seed);
qrand();

以上为伪随机数^[1]，不同在于qsrand()可以根据种子值seed的值不同，来生成不同的随机数序列。因此，可以使用当前时间作为种子，来进行模拟随机数。
示例代码：

qsrand(QTime(0,0,0).secsTo(QTime::currentTime()))

上面的代码中QDateTime::secsTo()解释如下：

Returns the number of seconds from this time to t. If t is earlier than this time, the number of seconds returned is negative.

Because QTime measures time within a day and there are 86400 seconds in a day, the result is always between -86400 and 86400.
secsTo() does not take into account any milliseconds.
Returns 0 if either time is invalid.

实际上QTime(0,0,0).secsTo(QTime::currentTime())返回的值就是从0到QTime::currentTime()的值。