Read and write QT XML files

I decided to write down the knowledge I gained every day, and to be able to do it as a basis for flipping. Although the content is very miscellaneous.

SVG is an XML-defined language used to describe two-dimensional vectors and vector/raster graphics.

enum Qiodevice::openmodeflag
Flags Qiodevice::openmode

This enum was used with open () to describe the mode in which a device is opened. It is also returned by OpenMode ().

Constant	Value	Description
Qiodevice::notopen	0x0000	The device is not open.
Qiodevice::readonly	0x0001	The device is open for reading.
Qiodevice::writeonly	0x0002	The device is open for writing.
Qiodevice::readwrite	ReadOnly | WriteOnly	The device is open for reading and writing.
Qiodevice::append	0x0004	The device is opened in append mode, so, and all data are written to the end of the file.
Qiodevice::truncate	0x0008	If possible, the device is truncated before it is opened. All earlier contents of the device is lost.
Qiodevice::text	0x0010	When reading, the End-of-line terminators is translated to ' \ n '. When writing, the End-of-line Terminators is translated to the local encoding, for example ' \ r \ n ' for Win32.
Qiodevice::unbuffered	0x0020	Any buffer in the device is bypassed.

Qiodevice::truncate; F covers the original content;

truncated [English] [ˈtrʌŋkeitid] [US] [ˈtrʌŋˌketɪd] new words concise interpretation More information

adj. cut off the top, shortened, truncated

v. (of a truncate past or past participle); truncated; bypassed v. Bypass, neglect (bypass of past participle) of the head or end;

Source: Write XML file
#include "Mainwindow.h"
#include "Ui_mainwindow.h"
#include <iostream>
#include <QTextStream>
#include <QDebug>

Mainwindow::mainwindow (Qwidget *parent):
Qmainwindow (parent),
UI (New Ui::mainwindow)
{
UI-&GT;SETUPUI (this);

QFile *file=new QFile ("/home/qust/qt/xml/1.xml");
if (!file->open (qiodevice::writeonly| qiodevice::readonly))
{
return;
}
Qdomdocument Doc;
Qdomtext text;
qdomelement element;
Qdomprocessinginstruction instruction;
Instruction=doc.createprocessinginstruction ("xml", "Version=\ ' 1.0\ '");
Doc.appendchild (instruction);
Qdomelement root=doc.createelement ("KDevelop");
Doc.appendchild (root);
Qdomelement general=doc.createelement ("General");
Root.appendchild (General);

Element=doc.createelement ("author");
Text=doc.createtextnode ("Zeki");

Element.appendchild (text);
General.appendchild (Element);

Element=doc.createelement ("email");
Text=doc.createtextnode ("caizhiming@tom.com");
Element.appendchild (text);
General.appendchild (Element);

Qtextstream out (file);
Doc.save (out,4);
File->close ();

}

Mainwindow::~mainwindow ()
{
Delete UI;
}

After running:

Read the XML source code:

#include "Mainwindow.h"
#include "Ui_mainwindow.h"
#include <QtXml>
#include <QDebug>
#include <QFile>
Mainwindow::mainwindow (Qwidget *parent):
Qmainwindow (parent),
UI (New Ui::mainwindow)
{
UI-&GT;SETUPUI (this);
Qdomdocument Dom;
QFile *file=new QFile ("/home/qust/qt/xml/1.xml");
if (File->open (qiodevice::readonly))
{
Dom.setcontent (file);

}

Qdomnodelist email=dom.elementsbytagname ("email");
Qdebug () <<email.count ();
Qdebug () <<email.item (0). Toelement (). text ();
Qdomnodelist general=kdevelop.item (0). Toelement (). ChildNodes ();
Qdebug () <<general.item (0). Toelement (). text ();
}

Mainwindow::~mainwindow ()
{
Delete UI;
}