XML 解析之QXmlStreamReader

xml：

<?xml version="1.0" encoding="UTF-8"?>
<library>
	<book id="01">
		<title>Qt</title>
		<author>shiming</author>
	</book>
	<book id="02">
		<title>linux</title>
		<author>shiming</author>
	</book>
</library>

QFile file(":/my.xml");
    if(!file.open(QIODevice::ReadOnly))
    {
        qDebug() << "Error: cannot open file";
        return 1;
    }

    QXmlStreamReader reader;

    //设置文件,这时会将流设置为初始状态
    reader.setDevice(&file);

    //如果没有读到文档结尾， 而且没有出现错误
    while(!reader.atEnd())
    {
        QXmlStreamReader::TokenType type = reader.readNext();

        //下面便根据几号的类型来进行不同的输出
        if(type == QXmlStreamReader::StartDocument)
        {
            qDebug() << reader.documentEncoding() << reader.documentVersion();
        }
        if(type == QXmlStreamReader::StartElement)
        {
            qDebug() << "<" << reader.name() << ">";
            if(reader.attributes().hasAttribute("id"))
            {
                qDebug() << reader.attributes().value("id");
            }
        }
        if(type == QXmlStreamReader::EndElement)
        {
            qDebug() << "</" << reader.name() << ">";
        }
        if(type == QXmlStreamReader::Characters && !reader.isWhitespace())
        {
            qDebug() << reader.text();
        }
    }

    //如果读取过程中出现错误，那么请输出错误信息
    if(reader.hasError())
    {
        qDebug() << "error" << reader.errorString();
    }
    file.close();

"UTF-8" "1.0"

< "library" >

< "book" >

"01"

< "title" >

"Qt"

</ "title" >

< "author" >

"shiming"

</ "author" >

</ "book" >

< "book" >

"02"

< "title" >

"linux"

</ "title" >

< "author" >

"shiming"

</ "author" >

</ "book" >

</ "library" >

（编辑：李大同）

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