QT4.8xml写入(2)

搞个简单点的xml写入，可以直接运行的

#-------------------------------------------------
#
# Project created by QtCreator 2022-10-31T14:10:02
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = untitled
TEMPLATE = app


SOURCES += main.cpp\
        widget.cpp

HEADERS  += widget.h

FORMS    += widget.ui

QT += xml

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

#ifndef WIDGET_H
#define WIDGET_H

#include 

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT
    
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
    void init();
    void write();
private:
    Ui::Widget *ui;
};

#endif // WIDGET_H

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

#include "widget.h"
#include "ui_widget.h"
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    init();
    write();

     return;

}

void Widget::write()
{
    QFile file("food.xml");
    if(!file.open(QIODevice::ReadOnly)){
        QMessageBox::warning(nullptr,QObject::tr("fail"),QObject::tr("open food.xml fail!"),QMessageBox::Ok);
        return;
    }

     QDomDocument domDocument;
     if (!domDocument.setContent(&file, true)){
         QMessageBox::warning(nullptr,QObject::tr("fail"),QObject::tr("domDocument.setContent fail!"),QMessageBox::Ok);
         file.close();
         return;
     }
     QDomDocument xDoc;
     QDomElement docElem = domDocument.documentElement();
     QDomNode lastNode = docElem.lastChild();

     //在lastitem上添加一个节点
     QDomElement NodeItem = domDocument.createElement("Node");

     QDomElement SoftNameItem = domDocument.createElement("SoftName");

     SoftNameItem.appendChild(xDoc.createTextNode(""));

     NodeItem.appendChild(SoftNameItem);

     //添加元素节点到父节点
     docElem.appendChild(NodeItem);
     file.close();

     QFile fileModify("food.xml");
     if (!fileModify.open(QFile::WriteOnly | QFile::Text)){
         QMessageBox::warning(nullptr,QObject::tr("fail"),QObject::tr("fileModify food.xml fail"),QMessageBox::Ok);
         return;
     }

     QTextStream out(&fileModify);
     domDocument.save(out,4);
     fileModify.close();

     return;


}

void Widget::init()
{
    QFile file("food.xml");

    if(file.open(QIODevice::ReadOnly)){
        file.close();
        return;
    }

    if(!file.open(QIODevice::ReadWrite)){
        QMessageBox::warning(nullptr,QObject::tr("fail"),QObject::tr("open food.xml fail!"),QMessageBox::Ok);
        return;
    }

     QDomDocument domDocument;
     QDomProcessingInstruction pro = domDocument.createProcessingInstruction("xml", "version=\"1.0\" encoding=\"UTF-8\"");
     domDocument.appendChild(pro);

     QDomElement root = domDocument.createElement("hard");
     domDocument.appendChild(root);

     QTextStream out(&file);
     domDocument.save(out,4);
     file.close();
}

Widget::~Widget()
{
    delete ui;
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100