Qt总结之九：QMap中嵌套QList

版权声明：最终版权归YBAidam所有 https://blog.csdn.net/Aidam_Bo/article/details/85311689

前言

QMap和QList都支持 QList<T>::iterator 迭代器

一、初识 

#include <QtCore/QCoreApplication>
 
//
#include <QList>
#include <QMap>
#include <QDebug>
#include <iostream>
#include <QTextCodec>
 
//
int main(int argc, char *argv[])
{
	QCoreApplication a(argc, argv);
	QTextCodec::setCodecForTr(QTextCodec::codecForLocale());
 
	//QList容器测试
	qDebug() << QObject::tr("QList容器测试");	
	QList<int> list;
	for (int i = 0; i < 10; i++)
	{
		list.insert(list.end(), i);
	}
 
	QList<int>::iterator j;
	for (j = list.begin(); j!=list.end(); ++j)
	{
		qDebug() << (*j);
		*j = (*j) * 10;
	}
 
	QList<int>::const_iterator cj;
	for (cj = list.begin(); cj!=list.end(); ++cj)
	{
		qDebug() << (*cj);
	}
	
	
	//QMap容器测试
	qDebug() << QObject::tr("QMap容器测试");
	QMap<QString, QString> map;
	map.insert("beijing", "111");
	map.insert("shanghai", "021");
	map.insert("tianjin", "022");
 
	QMap<QString, QString>::const_iterator ck;
	for(ck = map.constBegin(); ck!=map.constEnd(); ck++)
	{
		qDebug() << ck.key() << " " << ck.value();
	}
 
	QMap<QString, QString>::iterator mk;
	mk = map.find("beijing");
	if (mk != map.end())
	{
		mk.value() = "010";
	}
	
	qDebug() << "";
 
	QMap<QString, QString>::const_iterator nck;
	for(nck = map.constBegin(); nck!=map.constEnd(); nck++)
	{
		qDebug() << nck.key() << " " << nck.value();
	}
 
	return a.exec();
}

二、QMap中嵌套QList

（1）一维数组

刚接触QT的QMap比较困惑，看这名字以为是二维数组

因为我把QList当作一维数组来用了，事实上也确实可以，但只当一维数组太浪费了。可参考别的资料

QMap<QString, QList<QString> > panelStatistics;
    QList<QString> panelInfo;
    panelInfo.push_back("0102");
    panelInfo.push_back("1253");
    panelInfo.push_back("1256");
    panelStatistics.insert("面板1", panelInfo);
 
    QMap<QString, QList<QString> >::iterator it;
    for(it = panelStatistics.begin(); it != panelStatistics.end(); ++it)
    {
            QList<QString> tmp = it.value();
            qDebug()<<it.key() <<" "<< tmp[0] <<" "<< tmp[1] <<" "<< tmp[2];
    }

（2）二位数组

//在初始化的时候这样
QMap<int, QList<Qstring> > tableDate;
QList<Qstring> tmp;
for(int i = 0; i < 10; i ++)
{
	tmp.clear();
	tmp.push_back("monday in row"   + QString::number(i));
	tmp.push_back("tuesday in row"  + QString::number(i));
	tmp.push_back("wensday in row"  + QString::number(i));
	tmp.push_back("thursday in row" + QString::number(i));
	tmp.push_back("friday in row"   + QString::number(i));
	tmp.push_back("sateday in row"  + QString::number(i));
	tmp.push_back("sunday in row"   + QString::number(i));
	tableDate.insert(i, tmp);
}
//取值可以这样
QList<Qstring> result;
result = tableDate.value(3);
for(int i = 0; i < reslut.length; i ++)
{
	qDebug() << result[i] + " ";
}

（3）类数据库

QMapIterator<int, QList<QString> > iter(tableDate);
QList<QString> whatDate;
while(iter.hasNext())
{
	iter.next();
	if(whatDate = iter.value())
	{
		qDebug() << whatDate[0];
		qDebug() << whatDate[1];
		qDebug() << whatDate[2];
		qDebug() << whatDate[3];
	}
}