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 plain copy

1. QFilefile("d:/test.txt");
2. file.open(QIODevice::WriteOnly);
4. QDomDocumentdoc;
5. QDomProcessingInstructioninstruction;
7. instruction=doc.createProcessingInstruction("xml","version=\'1.0\'");
8. doc.appendChild(instruction);
9. QDomElementroot=doc.createElement("html");
10. doc.appendChild(root);
11. QDomElementdata;
12. QDomElementtmp;
13. QDomTexttext;
14. data=doc.createElement("title");
15. text=doc.createTextNode(QStringLiteral("多看"));
16. data.appendChild(text);
17. root.appendChild(data);
18. tmp=doc.createElement("book");
19. "小说"));
20. tmp.appendChild(text);
21. root.appendChild(tmp);
22. QTextStreamout(&file);
23. doc.save(out,4);
24. 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>