QT XML文件 修改节点

感谢：l270378034的帮助

源xml文件：

<kdevelop>
   <general>
     <author>zeki</author>
     <email>caizhiming@tom.com</email>
   </general>
</kdevelop>

源程序：

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
     changeSave();
}

MainWindow::~MainWindow()
{
    delete ui;
}
bool MainWindow::openXmlFile(QString FilePath)
{
    QFile file( FilePath );
        if( !file.open( QFile::ReadOnly | QFile::Text  ) )
        {
            qDebug() << QObject::tr("error::ParserXML->OpenXmlFile->file.open->%s\n") << FilePath;

            return false;
        }

        if( !m_doc.setContent( &file ) )
        {
            qDebug() << QObject::tr("error::ParserXML->OpenXmlFile->doc.setContent\n") << FilePath;

            file.close();
            return false;
        }
        file.close();
        return true;
}
bool MainWindow::changeSave()
{
    if(!openXmlFile("/home/qust/qt/XML/2.xml"))
        {
            return false;
        }
        //修改保存xml
    QDomElement root = m_doc.documentElement();
       if(root.tagName()!= "kdevelop")
           return false;
       QDomNode n = root.firstChild();
       while ( !n.isNull() )
       {
           QDomElement e = n.toElement();
           if( !e.isNull())
           {
                       if( e.nodeName() == "general" )
                       {
                           QDomNodeList list = e.childNodes(); //获得元素e的所有子节点的列表
                           for(int a=0; a<list.count(); a++) //遍历该列表
                           {
                               QDomNode node = list.at(a);
                               if(node.isElement())
                               {
                                   if( node.nodeName() == "author" )
                                   { QDomNode oldnode = node.firstChild();     //标签之间的内容作为节点的子节点出现，得到原来的子节点
                                       node.firstChild().setNodeValue("csdn");   //用提供的value值来设置子节点的内容
                                       QDomNode newnode = node.firstChild();     //值修改过后
                                       node.replaceChild(newnode,oldnode);      //调用节点的replaceChild方法实现修改功能
                                   }
                                   if( node.nodeName() == "email" )
                                   {
                                       QDomNode oldnode = node.firstChild();
                                       node.firstChild().setNodeValue("test@tom.com");
                                       QDomNode newnode = node.firstChild();
                                       node.replaceChild(newnode,oldnode);
                                   }
                               }
                           }
                       }
                   }
           n = n.nextSibling();
             }
             QFile filexml("/home/qust/qt/XML/2.xml");
             if( !filexml.open( QFile::WriteOnly | QFile::Truncate) ){
                 qWarning("error::ParserXML->writeOperateXml->file.open\n");
                 return false;
                    }
                    QTextStream ts(&filexml);
                    ts.reset();
                    ts.setCodec("utf-8");
                    m_doc.save(ts, 4, QDomNode::EncodingFromTextStream);
                    filexml.close();
                    return true;


}

运行后：

<kdevelop>
  <general>
    <author>csdn</author>
    <email>test@tom.com</email>
  </general>
</kdevelop>

QDomNode QDomNode::nextSibling () const

Returns the next sibling in the document tree. Changing the returned node will also change the node in the document tree.

If you have XML like this:

 <h1>Heading</h1>
 <p>The text...</p>
 <h2>Next heading</h2>

and this QDomNode represents the <p> tag, nextSibling() will return the node representing the <h2> tag.

sibling 1.同层级 2.同辈 3.兄弟或姊妹。 4.同胞 Sibling 1.同胞兄妹