Qt 读写 XML 文件

Qt 读写 XML 文件

#include <QXmlStreamWriter>     //头文件

（1）写入 XML ：
    QString filePath = "xxx";
    QFile file(filePath);
    if(!file.open(QIODevice::WriteOnly || QIODevice::Text || QIODevice::Truncate)){   // QIODevice::Truncate 代表打开文件时清空文件内容
        qDebug() << "open xml file failed";
        return;
    }

    QXmlStreamWriter writer(&file);
    writer.setAutoFormatting(true);    //设置自动格式化

    writer.writeStartDocument("1.0");   //文档开始
    writer.writeStartElement("batch");  //节点
    writer.writeAttribute("batchType", "xxx");
    writer.writeStartElement("entity");  //子节点

    //开始填写内容
    writer.writeTextElement("StationID", "54511");  //元素
    ...

    writer.writeEndElement();    //子节点结尾
    writer.writeEndElement();    //节点结尾
    writer.writeEndDocument();    //文档结尾

    file.close();

    以上代码最终会生成的 XML 内容如下：
        <batch batchType="status">
            <entity>
                <StationID>54511</StationID>
                ...
            </entity>
        </batch>

（2）读取 XML ：
    QString filePath = "xxx";
    QFile file(filePath);
    if(!file.open(QIODevice::ReadOnly || QIODevice::Text || QIODevice::Truncate)){
        qDebug() << "open xml file failed";
        return;
    }

    QXmlStreamReader reader(&file);
    while(!reader.atEnd() && !reader.hasError()){
        QXmlStreamReader::TokenType token = reader.readNext();    //获取一行的解析令牌
        if (token == QXmlStreamReader::StartDocument){
            continue;
        }
        if (token == QXmlStreamReader::StartElement)
        {
            if (reader.name() == "xxx")   //xxx属性节点
            {
                QString attributeValue = reader.attributes().value("attribute").toString();
                qDebug() << "Attribute value: " << attributeValue;
            }
            else if (reader.name() == "xxx")   //xxx文本值
            {
                QString textValue = reader.readElementText();
                qDebug() << "Text value: " << textValue;
            }
        }
    }

    file.close();