VS+QT读取配置文件，将内容用树状列表显示

本文链接：https://blog.youkuaiyun.com/zhou714534957/article/details/124953865

首先创建.xml文件，类型如下所示：

<?xml version="1.0" encoding="UTF-8"?>
<Root>
    <Group GroupID="1" MainIndex="0" Name="湖南">
        <Back GroupID="1" indexID="1" strName="changde"  Describe="常德"/>
        <Back GroupID="1" indexID="2" strName="changsha" Describe="长沙"/>
		<Back GroupID="1" indexID="3" strName="yongzhou" Describe="永州"/>
		<Back GroupID="1" indexID="4" strName="hengyang" Describe="衡阳"/>
		<Back GroupID="1" indexID="5" strName="chenzhou" Describe="郴州"/>
		<Back GroupID="1" indexID="6" strName="yueyang" Describe="岳阳"/>
	    <Back GroupID="1" indexID="7" strName="zhangjiajie" Describe="张家界"/>
		<Back GroupID="1" indexID="8" strName="yiyang" Describe="益阳"/>
    </Group>
	<Group GroupID="2" MainIndex="0" Name="广东">
        <Back GroupID="2" indexID="1" strName="guangzhou" Describe="广州"/>
        <Back GroupID="2" indexID="2" strName="shenzhen" Describe="深圳"/>
		<Back GroupID="2" indexID="3" strName="qingyuan" Describe="清远"/>
		<Back GroupID="2" indexID="4" strName="zhaoqing" Describe="肇庆"/>
		<Back GroupID="2" indexID="5" strName="zhanjiang" Describe="湛江"/>
		<Back GroupID="2" indexID="6" strName="jiangmen" Describe="江门"/>
		<Back GroupID="2" indexID="7" strName="zhongshan" Describe="中山"/>
		<Back GroupID="2" indexID="8" strName="huizhou" Describe="惠州"/>
    </Group>
</Root>

上代码头文件

/*************************************************************************
File name:			loadxmlTEST.h
Author:            	ZHOU
Version:    		V1.0.0
Finished Date:      2022-05-26
Modified Date:      2022-05-26
Description:		测试读取xml，用树状图显示
**************************************************************************/
#pragma once

#include <QtWidgets/QMainWindow>
#include "ui_loadxmlTEST.h"
#include <QXmlStreamReader>
#include <QCoreApplication>
#include <QTreeWidgetItem>

struct cityinfo
{
	QString Name;
	QString Spell;
};

struct CityData
{
	QString strName;
	QList<cityinfo> cityinfolist;
};


class loadxmlTEST : public QMainWindow
{
    Q_OBJECT

public:
    loadxmlTEST(QWidget *parent = Q_NULLPTR);

private:
	void loadxml(QString tmpPath);
	QList<cityinfo> loadDataXml(QXmlStreamReader *reader);
	void initselectwidget();//初始化选择窗口
	void updateTreewidget(QTreeWidgetItem *item);//更新树状图
	void getTreewidgetData();//获取选中状态

private slots:
	void slotextarct();
	void slotopenfile();
	void slotTreewidgetChange(QTreeWidgetItem* item, int column);

private:
    Ui::loadxmlTESTClass ui;



};

上代码cpp：

#include "loadxmlTEST.h"
#include <QObject>
#include <QFileDialog>


#pragma execution_character_set("utf-8")
QList<CityData> myCityDatalist;

loadxmlTEST::loadxmlTEST(QWidget *parent)
    : QMainWindow(parent)
{
    ui.setupUi(this);
	connect(ui.btnextarct, SIGNAL(clicked()), this, SLOT(slotextarct()));
	connect(ui.actionopen, SIGNAL(triggered()), this, SLOT(slotopenfile()));

	
	myCityDatalist.clear();
}

void loadxmlTEST::slotextarct()
{
	getTreewidgetData();
}

void loadxmlTEST::loadxml(QString tmpPath)
{
	QFile file(tmpPath);
	myCityDatalist.clear();
	if (!file.open(QIODevice::ReadOnly|QIODevice::Text))
	{
		return;
	}
	ui.textBrowser->clear();
	QXmlStreamReader reader(&file);
	while (!reader.atEnd())//单行读取
	{
		reader.readNext();
		QString Elename = reader.name().toString();
		CityData myCityData;
		if (reader.isStartElement() && Elename=="Group")//读取组别信息
		{
			QXmlStreamAttributes attribute = reader.attributes();
			if (attribute.hasAttribute("Name"))
			{
				//获得组别名称
				
				myCityData.strName = attribute.value("Name").toString();
			}
			myCityData.cityinfolist=loadDataXml(&reader);

			myCityDatalist.append(myCityData);
			
		}
	}
	
}

QList<cityinfo> loadxmlTEST::loadDataXml(QXmlStreamReader *reader)
{
	QList<cityinfo> mycityinfolist;
	if (reader==nullptr)
	{
		return mycityinfolist;
	}
	while (!reader->atEnd())
	{
		cityinfo mycityinfo;
		reader->readNext();
		QString Elename = reader->name().toString();
		if (reader->isStartElement() && Elename==tr("Back"))
		{
			QXmlStreamAttributes attribute = reader->attributes();
		    
			if (attribute.hasAttribute("strName"))
			{
				mycityinfo.Name = attribute.value("strName").toString();
			}
			if (attribute.hasAttribute("Describe"))
			{
				mycityinfo.Spell = attribute.value("Describe").toString();
			}
			mycityinfolist.append(mycityinfo);
		}
		if (reader->isEndElement() && Elename=="Group")//结束
		{
			break;
		}
	}
	
	return mycityinfolist;
}

void loadxmlTEST::initselectwidget()
{
	ui.treeWidget->clear();
	for (auto dataitem:myCityDatalist)
	{
		QTreeWidgetItem *topitem = new QTreeWidgetItem;
		topitem->setText(0, dataitem.strName);
		topitem->setCheckState(0, Qt::Unchecked);
		ui.treeWidget->addTopLevelItem(topitem);
		for (auto cityitem : dataitem.cityinfolist)
		{
			QTreeWidgetItem *item = new QTreeWidgetItem(topitem);
			item->setText(0, cityitem.Spell);
			item->setText(1, cityitem.Name);
			item->setCheckState(0, Qt::Unchecked);
		}
		
	}
	ui.treeWidget->expandAll();//展开全部
	connect(ui.treeWidget, SIGNAL(itemChanged(QTreeWidgetItem*,int)), this, SLOT(slotTreewidgetChange(QTreeWidgetItem*,int)));
}

void loadxmlTEST::updateTreewidget(QTreeWidgetItem *item)
{
	//获取父节点
	QTreeWidgetItem*parent = item->parent();
	if (parent==nullptr)
	{
		return;
	}
	//获取子节点选中数量
	int ischecked = 0;
	int childCount = parent->childCount();
	for (int i=0;i<childCount;i++)
	{
		if (parent->child(i)->checkState(0)==Qt::Checked)
		{
			ischecked++;
		}
	}

	if (ischecked<=0)
	{
		parent->setCheckState(0, Qt::Unchecked);
	}
	else if (ischecked>=childCount)
	{
		parent->setCheckState(0, Qt::Checked);
	}
	else
	{
		parent->setCheckState(0, Qt::PartiallyChecked);
	}

}

void loadxmlTEST::getTreewidgetData()
{
	QTreeWidgetItemIterator it(ui.treeWidget);

	ui.textBrowser->clear();

	while (*it)
	{
		if ((*it)->checkState(0)==Qt::Checked)
		{
			QTreeWidgetItem *item = *it;
			QString str = item->text(0);
			str += item->text(1);
			ui.textBrowser->append(str);
		}
		++it;
	}
}

void loadxmlTEST::slotopenfile()
{
	//打开文件，获取文件地址(多个)
	/*QStringList fileNames = QFileDialog::getOpenFileNames(this, tr("导入xml"), "../",
		tr("xml文件 (*.xml;);;所有文件 (*.*)"));*/
	//解析文件list
		//if (fileNames.size() > 0)
		//{
		//	for (auto fileitem : fileNames)
		//	{
		//		QString filePath = fileitem;
		//		//auto tmp = filePath.length();
		//		//auto rrr = filePath.lastIndexOf("/");
		//		QString fileName = filePath.right(filePath.length() - filePath.lastIndexOf("/") - 1);

		//	}
		//}

	//打开文件，单个
	QString filenamexml = QFileDialog::getOpenFileName(this, tr("导入xml"), "../",
		tr("xml(*.xml;);;所有文件(*.*)"));

	//加载xml文件
	loadxml(filenamexml);

	initselectwidget();
	
}

void loadxmlTEST::slotTreewidgetChange(QTreeWidgetItem * item, int column)
{
	//获取当前选中名称
	QString strName = item->text(column);
	int cnt = item->childCount();//子节点个数
	if (cnt>0 && item->checkState(column)==Qt::Checked)
	{
		for (int i=0;i<cnt;i++)
		{
			item->child(column+i)->setCheckState(0,Qt::Checked);
		}
	}
	else if (cnt>0 && item->checkState(column)==Qt::Unchecked)
	{
		for (int i=0;i<cnt;i++)
		{
			item->child(column + i)->setCheckState(0, Qt::Unchecked);
		}
	}
	else
	{
		//更新上级选中状态
		updateTreewidget(item);
	}
}

注意事项：

1、QString filenamexml = QFileDialog::getOpenFileName(this, tr("导入xml"), "../",
tr("xml(*.xml;);;所有文件(*.*)"));

“ ”中的括号也需要用英文输入法，否则筛选无效或错误。