Qt的XML文件读取测试01

用Qt读取XML文件中的配置并且进行打印。

主函数main.cpp进行模拟，DataManager进行数据读取，具体实现如下：

Pro文件

QT -= gui
QT += xml

CONFIG += c++11 console
CONFIG -= app_bundle

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
        DataManager.cpp \
        main.cpp

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

HEADERS += \
    DataManager.h

需要再Qt中配置xml选项。

DataManager

#ifndef DATAMANAGER_H
#define DATAMANAGER_H

#include <QObject>
#include <QFile>
#include <QDir>
#include <QFile>
#include <QTextStream>
#include <QDomDocument>
#include <QXmlStreamWriter>
#include <QDebug>

class DataManager: public QObject
{
    Q_OBJECT
public:
    explicit DataManager(QObject *parent = nullptr);
    void analyse(const QString& filename);

private:
    QString          m_Address;
    QString          m_Version;
};

#endif // DATAMANAGER_H

analyse()用来解析XML文件。

#include "DataManager.h"

DataManager::DataManager(QObject *parent)
{

}

void DataManager::analyse(const QString &filename)
{
    QFile file(filename);
    if(!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qDebug() << "文件打开失败!";
        return;
    }

    QXmlStreamReader stream_reader;
    stream_reader.setDevice(&file);
    while(!stream_reader.atEnd()) {
        QXmlStreamReader::TokenType node = stream_reader.readNext();
        if(node == QXmlStreamReader::StartElement) {
            QString element = stream_reader.name().toString();

            if(element == "HOST_ADDRESS") {
                node = stream_reader.readNext();
                if(node == QXmlStreamReader::Characters) {
                    QString host_address = stream_reader.text().toString();
                    qDebug() << "Host: " << host_address;
                }
            } else if(element == "PORT") {
                node = stream_reader.readNext();
                if(node == QXmlStreamReader::Characters) {
                    int port = stream_reader.text().toInt();
                    qDebug() << "Port: " << QString::number(port);
                }
            }
        }
    }

    if(stream_reader.hasError()){
        return;
    }
    file.close();
}

假设只配置了地址和端口号，解析读取并打印。

XML内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <HOST_ADDRESS>127.0.0.1</HOST_ADDRESS>
    <PORT>8849</PORT>
</root>

这个XML文件需要放到代码路径下。

主函数

#include <QCoreApplication>
#include <QDebug>
#include "DataManager.h"

int main(int argc, char *argv[])
{
    DataManager manager;
    QString filename = "./Config.xml";

    manager.analyse(filename);
    qDebug() << "Finished!";
    return 0;
}

执行结果如下：

解析完毕。