QT5自学教程（72）——xml Editor

利用前面两节介绍的读写xml的知识，在这一节实现一个简单xml编辑器。下面给出我们的简单例子。

[1]建立一个gui项目

[2]在窗口中添加一个tree view控件和一个PushButton控件

[3]在项目中添加必要的程序

dialog.h程序

#ifndef DIALOG_H
#define DIALOG_H
 
#include <QDialog>
#include <QDebug>
#include <QFile>
#include <QStandardItemModel>
#include <QDomDocument>
namespace Ui {
class Dialog;
}
 
class Dialog : public QDialog
{
    Q_OBJECT
 
public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();
 
private slots:
    void on_pushButton_clicked();
 
private:
    Ui::Dialog *ui;
    QStandardItemModel *model;
    QString fileName;
    void ReadFile();
    void WriteFile();
};
 
#endif // DIALOG_H

dialog.cpp程序

#include "dialog.h"
#include "ui_dialog.h"
 
Dialog::Dialog(QWidget *parent) :
    QDialog(parent),ui(new Ui::Dialog)
{
    ui->setupUi(this);
    fileName = "F:/test.xml";
    model = new QStandardItemModel(0,1,this);
    ReadFile();
    ui->treeView->setModel(model);
}
 
Dialog::~Dialog()
{
    delete ui;
}
//Read XML
void Dialog::ReadFile()
{
    QStandardItem *root = new QStandardItem("Books");
    model->appendRow(root);
    QDomDocument doc;
    //Load the xml file
    QFile file(fileName);
    if(file.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        doc.setContent(&file);
        file.close();
    }
    //get xml root element
    QDomElement xmlRoot = doc.firstChildElement();
    //Read the book
    QDomNodeList books = xmlRoot.elementsByTagName("Book");
    for(int i = 0; i < books.count(); ++i)
    {
        QDomElement book = books.at(i).toElement();
        QStandardItem *bookItem = new QStandardItem(book.attribute("Name"));
        //Read the Chapter of the book
        QDomNodeList chapters = book.elementsByTagName("Chapter");
        for(int h = 0; h < chapters.count(); ++h)
        {
            QDomElement chapter = chapters.at(h).toElement();
            QStandardItem *chapterItem = new QStandardItem(chapter.attribute("Name"));
            bookItem->appendRow(chapterItem);
        }
        root->appendRow(bookItem);
    }
}
//Write XML
void Dialog::WriteFile()
{
    //Write the xml file
    QDomDocument doc;
    //Make a root node
    QDomElement xmlRoot = doc.createElement("Books");
    doc.appendChild(xmlRoot);
    QStandardItem *root = model->item(0,0);
    for(int i = 0; i < root->rowCount(); ++i)
    {
        QStandardItem *book = root->child(i,0);
        QDomElement xmlBook = doc.createElement("Book");
        xmlBook.setAttribute("Name",book->text());
        xmlBook.setAttribute("ID",i);
        xmlRoot.appendChild(xmlBook);
        for(int h = 0; h < book->rowCount(); ++h)
        {
            QStandardItem *chapter = book->child(h,0);
            QDomElement xmlChapter = doc.createElement("Chapter");
            xmlChapter.setAttribute("Name",chapter->text());
            xmlChapter.setAttribute("ID",i);
            xmlBook.appendChild(xmlChapter);
        }
    }
    //Save to disk
    QFile file(fileName);
    if(!file.open(QIODevice::WriteOnly | QIODevice::Text))
    {
        qDebug() << "Failed to write file";
    }
    QTextStream out(&file);
    out << doc.toString();
    out.flush();
    file.close();
    qDebug() << "Finished";
}
 
void Dialog::on_pushButton_clicked()
{
    //Save
    WriteFile();
}

[4]输出结果

（1）原始xml打开后显示

（2）在窗口修改xml相关项之后点击save，关闭应用，再次打开应用后显示如下

小结

这一节实现了一个简单xml编辑器应用程序。PS： 今天浑身酸痛，可能做得事情有点多再加上昨天打了三个小时篮球，效率很低诶。那今天就先到这里好了o(╯□╰)o

2014/9/16

Wayne HDU