qt读写xml文件

http://blog.csdn.net/xiexingshishu/article/details/45177023

1、DOM方式

写xml文件，以QDomText方式写，代码如下

[cpp]view plaincopy
QFilefile("d:/test.txt");
file.open(QIODevice::WriteOnly);
QDomDocumentdoc;
QDomProcessingInstructioninstruction;
instruction=doc.createProcessingInstruction("xml","version=\'1.0\'");
doc.appendChild(instruction);
QDomElementroot=doc.createElement("html");
doc.appendChild(root);
QDomElementdata;
QDomElementtmp;
QDomTexttext;
data=doc.createElement("title");
text=doc.createTextNode(QStringLiteral("多看"));
data.appendChild(text);
root.appendChild(data);
tmp=doc.createElement("book");
"小说"));
tmp.appendChild(text);
root.appendChild(tmp);
QTextStreamout(&file);
doc.save(out,4);
file.close();

读代码为

file.open(QIODevice::ReadOnly); 
   QDomDocumentdoc;
doc.setContent(&file);
QDomElementroot=doc.documentElement();
for(QDomNodenode=root.firstChild();!node.isNull();node=node.nextSibling()){
QDomElementelement=node.toElement();
QStringtagName=element.tagName();
if(tagName=="title"){
qDebug()<<element.text();
}else"book"){
}
}

以QDomAttr方式写：
QDomAttrdata;
QDomAttrtmp;
data=doc.createAttribute("title");
data.setValue(QStringLiteral("多看"));
root.setAttributeNode(data);
tmp=doc.createAttribute(tmp.setValue(QStringLiteral(root.setAttributeNode(tmp);
QTextStreamout(&file);
读QDomAttr
qDebug()<<root.attribute("book");
file.close();

2、用QXmlStreamReader和QXmlStreamWriter

写文件，设置相关联的文件，用writeStartDocument来开始，用writeEndDocument来结束

用writeStartElement和writeEndElement来表示元素的开始和结束，需要成对使用

<name>a</name>形式，用writeTextElement

<name a=""/>形式，用writeAttribute

"test.txt");file.open(QIODevice::writeOnly);

QXmlStreamWriterxmlstreamwriter(&file);

xmlstreamwriter.setAutoFormatting(true);

xmlstreamwriter.writeStartDocument();

xmlstreamwriter.writeStartElement("xml");

"round");

xmlstreamwriter.writeAttribute("id",mRoundId);

"tableid",mTableId);

//player1

"player1");

"framescore",mPlayer1Frame);

"points",mPlayer1Point);

"break",mPlayer1ContinuePoint);

　　xmlstreamwriter.writeCharacters("HelloWorld");//添加内容

xmlstreamwriter.writeEndElement();

//player2

"player2");

xmlstreamwriter.writeEndElement();

xmlstreamwriter.writeEndDocument();file.close();

结果如下：

<?xmlversion="1.0"encoding="UTF-8"?>

<xml>

<roundid=""tableid="1">

<player1framescore=""points=""break="">HelloWorld</player1>

<player2framescore=""/>

</round>

</xml>

在读取时，是通过循环，while (!reader.atEnd()) {reader.readNext();.....;}

猜你在找的XML相关文章