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QString
//QString定义 QString s1 = “abc”; QString s2(“hello”); //字符串连接 QString s = s1 + s2;//组包
s = QString(“a = %1, b = %2, c = %3”).arg(250).arg(“hello”).arg(22.22); qDebug()<<s; //输出结果:a = 250, b = hello, c = 22.22s = “a=250,b=hello,c=22.22”;
//参数表示按逗号分隔, 拆分出第0段到第1段, 保存到tmp QString tmp = s.section(",", 0, 1); qDebug()<<"tmp = "<<tmp; //输出结果:tmp=“a=250,b=hello”s = “a=250,b=hello,c=22.22”;
//参数表示按逗号分隔, 拆分出第0段到第0段, 保存到tmp QString tmp = s.section(",", 0, 0); qDebug()<<"tmp = "<<tmp; //输出结果:tmp=“a=250”tmp = tmp.section("=", 1, 1);
qDebug()<<“tmp=”<<tmp; //输出结果:tmp=“250”;//QString转int
int a = tmp.toInt(); qDebug()<<“a=”<<a; //输出结果:a=250;//int转QString组包方式转
tmp = QString("%1").arg(123); qDebug()<<“tmp=”<<tmp; //输出结果:tmp=“123”//int转QString函数方式转
tmp = QString::number(234);//char *转QString
const char * buf = “hello, world”; QString ss = buf; qDebug()<<"ss = "<< ss;//std::string转QString
string s = “hello, world” QString ss = QString::fromStdString(s); qDebug()<<"ss = "<< ss;//std::wstring转QString
std::wstring wstr(L"你好, 世界"); QString ss = QString::fromStdWString(wstr); qDebug()<<"ss = "<< ss;//字符数组转QString
char buf2[100] = “hello world”; ss = buf2; qDebug()<<"ss = "<<ss;//QString转char *
ss = “hello abc”; //如果没有中文(即字符串为ASCII): QByteArray tmp = ss.toLatin1(); char * buf3 = tmp.data(); //如果有中文(即字符串为unicode): QByteArray tmp = ss.toLocal8Bit(); char * buf4 = tmp.data();//替换QString中字符串
QString text(“text-decoration: none”); text.replace(“none”, “underline”);//去除QString首尾的空格(包括’\t’, ‘\n’, ‘\v’, ‘\f’, ‘\r’)
QString text(" text-decoration: none "); text = text.trimmed();//字符移除操作
QString test = “hello,china”; QString tmp = test.remove(2, 4); //从下标2的字符开始, 移除4个字符 qDebug() << "test = " << test; //输出hechina qDebug() << "tmp = " << tmp; //输出hechina//判断字符是否以某字符或字符串开始/结束(startsWith/endsWith)
QString test= “@192.168.0.1”; if(true == test.startsWith("@")) { //do something }//判断QString是否空
QString().isEmpty(); // return true QString("").isEmpty(); // return true QString(" ").isEmpty(); // return false QString(“abc”).isEmpty(); // return falseQString().isNull(); // return true
QString("").isNull(); // return false QString(" ").isNull(); // return false QString(“abc”).isNull(); // return false QStringList //定义 QStringList list; //添加字符串 list << “hello”; list << “world”; list.append(“abc”); //例子2 QStringList chinaMonth; chinaMonth << QStringLiteral(“正月”) << QStringLiteral(“二月”) << QStringLiteral(“三月”) << QStringLiteral(“四月”) << QStringLiteral(“五月”) << QStringLiteral(“六月”) << QStringLiteral(“七月”) << QStringLiteral(“八月”) << QStringLiteral(“九月”) << QStringLiteral(“十月”) << QStringLiteral(“冬月”) << QStringLiteral(“腊月”) ; //打印 qDebug()<< “list =”<< list; //遍历 for(int i = 0; i< list.size();++i) { QString tmp = list.at(i); qDebug()<<“tmp =”<< tmp; }//使用QStringList拆分QString
QString str = “hello,world,abc,qt”; QStringList list2 = str.split(","); qDebug()<<“list2=”<<list2; //输出:list2=(“hello”,“world”,“abc”,“qt”);//判断QStringList中是否包含某个成员
bool b = list2.contains(“123”);//移除QStringList中的成员
list2.removeOne(“abc”);转载地址:http://fsesi.baihongyu.com/