xml用於保存數據（Qt5）實例

 1 //Settings.h
 2 #ifndef _SETTINGS_H
 3 #define _SETTINGS_H
 4 
 5 class Settings
 6 {
 7 public:
 8     Settings();
 9 
10     int load();
11     int save();
12 
13 public:
14     int period;
15     int radius;
16     int grain;
17 };
18 #endif

 1 //Settings.cpp
 2 #include "Settings.h"
 3 #include "../tinyxml/AfTinyXml.h"
 4 
 5 Settings::Settings()
 6 {
 7 
 8 }
 9 
10 int Settings::load()
11 {
12     // 解析xml
13     TiXmlDocument xml_doc;
14     if(!xml_doc.LoadFile("settings.xml"))
15     {
16         return -1;
17     }
18 
19     // 根節點
20     TiXmlElement* xml_root = xml_doc.RootElement();
21     if (NULL == xml_root)
22     {
23         return -1;
24     }
25 
26     this->period = AfTinyXml::childAsInt(xml_root, "period");
27     this->radius = AfTinyXml::childAsInt(xml_root, "radius");
28     this->grain = AfTinyXml::childAsInt(xml_root, "grain");
29     return 0;
30 }
31 
32 int Settings::save()  //保存配置文件
33 {
34     TiXmlDocument xml_doc;
35     xml_doc.LinkEndChild(new TiXmlDeclaration( "1.0", "GBK", "" ));
36 
37     TiXmlElement * xml_root = new TiXmlElement("root");
38     xml_doc.LinkEndChild(xml_root);
39 
40     AfTinyXml::addChild(xml_root, "period", period);
41     AfTinyXml::addChild(xml_root, "radius", radius);
42     AfTinyXml::addChild(xml_root, "grain", grain);
43 
44     xml_doc.SaveFile("settings.xml");
45     return 0;
46 }

 1 //qt.h
 2 #ifndef QT5_H
 3 #define QT5.H
 4 
 5 #include <QtGui/QWidget>
 6 #include "ui_QT5.h"
 7 
 8 #include "Settings.h"
 9 
10 class QT5 : public QWidget
11 {
12     Q_OBJECT
13 
14 public:
15     QT5(QWidget *parent = 0, Qt::WFlags flags = 0);
16     ~QT5();
17 
18 private slots:
19     int OnSettingsChanged();
20 
21 private:
22     Ui::QT5Class ui;
23 
24     Settings m_settings;//聲明一個Settings類實例m_settings
25 };
26 
27 #endif // QT5

 1 //qt5.cpp
 2 #include "qt5.h"
 3 
 4 QT5::QT5(QWidget *parent, Qt::WFlags flags)
 5     : QWidget(parent, flags)
 6 {
 7     ui.setupUi(this);
 8 
 9     m_settings.load();//讀取配置文件
10     ui.m_ctlPeriod->setValue(m_settings.period);
11     ui.m_ctlGrain->setValue(m_settings.grain);
12     ui.m_ctlRadius->setValue(m_settings.radius);    
13     
14     connect(ui.m_ctlRadius, SIGNAL(    valueChanged(int)), this, SLOT(OnSettingsChanged()));
15     connect(ui.m_ctlGrain, SIGNAL(    valueChanged(int)), this, SLOT(OnSettingsChanged()));
16     connect(ui.m_ctlPeriod, SIGNAL(    valueChanged(int)), this, SLOT(OnSettingsChanged()));
17     
18     ui.frame->Adjust(m_settings.period, m_settings.grain, m_settings.radius);
19 
20 }
21 
22 QT5::~QT5()
23 {
24 
25 }
26 
27 
28 int QT5::OnSettingsChanged()
29 {
30     ui.frame->Adjust(ui.m_ctlPeriod->value(), 
31         ui.m_ctlGrain->value(),
32         ui.m_ctlRadius->value());
33 
34     m_settings.period = ui.m_ctlPeriod->value();
35     m_settings.grain = ui.m_ctlGrain->value();
36     m_settings.radius = ui.m_ctlRadius->value();
37     m_settings.save();  //保存配置文件
38 
39     return 0;
40 }