QT开发之字符串各种操作

1、字符串分割

split函数：第一个为分隔判断符，第二个为是否跳过空格。

例：QString a = "1,2,3,4,5,6,7";

QList ls;

ls = a.split(",");//ls = "1","2","3","4","5","6","7"

ls = a.split(",",QString::SkipEmptyParts);//ls = "1","2","3","4","5","6","7"

section函数：第一个为分隔判断符，第二个为判断起始位置，第三个为判断结束位置，位置为正时从左到右，为负是从右到左

例：QString a = "1,2,3,4,5,6,7";

QString b = a.section(",",1,1);//b=2,

QString b = a.section(",",-1,--1);//b=6

QString b = a.section(",",1,2);//b=2,3

2、判断字符在字符串中是否存在

QString::contains

例子：QString a = "1,2,3,4,5,6,7";

BOOL b = a.contains(",",Qt::CaseSensitive);//b=true