根据某个字符切分字符

QString section(QChar asep, int astart, int aend, SectionFlags aflags)

QString str = "/user/home/xxx/myapp";

QString result = str.section('/', 2);

result为"home/xxx/myapp"

去除字符串首位的空格并把中间的多个空格合并为一个空格

QString simplified()

QString str = "      /user/h  om    e/xx x/m yapp   ";

QString result = str.simplified();

result为"/user/h om e/xx x/m yapp"

去除字符串首位的空格

QString trimmed()

QString str = "      /user/h  om    e/xx x/m yapp   ";

QString result = str.trimmed();

result为"/user/h  om    e/xx x/m yapp"