Qt-Qt之QHash的使用分析
作者：互联网
相关资料：
https://blog.csdn.net/wsp_1138886114/article/details/123480932
https://download.csdn.net/download/zhujianqiangqq/85798799 csdn代码包下载
代码实例：
.pro
1 QT += core gui
2
3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
4
5 CONFIG += c++11
6
7 # The following define makes your compiler emit warnings if you use
8 # any Qt feature that has been marked deprecated (the exact warnings
9 # depend on your compiler). Please consult the documentation of the
10 # deprecated API in order to know how to port your code away from it.
11 DEFINES += QT_DEPRECATED_WARNINGS
12
13 # You can also make your code fail to compile if it uses deprecated APIs.
14 # In order to do so, uncomment the following line.
15 # You can also select to disable deprecated APIs only up to a certain version of Qt.
16 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
17
18 SOURCES += \
19 main.cpp \
20 mainwindow.cpp
21
22 HEADERS += \
23 mainwindow.h
24
25 FORMS += \
26 mainwindow.ui
27
28 # Default rules for deployment.
29 qnx: target.path = /tmp/$${TARGET}/bin
30 else: unix:!android: target.path = /opt/$${TARGET}/bin
31 !isEmpty(target.path): INSTALLS += target
View Code
main.cpp
1 #include "mainwindow.h"
2
3 #include <QApplication>
4
5 int main(int argc, char *argv[])
6 {
7 QApplication a(argc, argv);
8 MainWindow w;
9 w.show();
10 return a.exec();
11 }
View Code
mainwindow.h
1 #ifndef MAINWINDOW_H
2 #define MAINWINDOW_H
3
4 #include <QMainWindow>
5 #include <QDebug>
6
7 QT_BEGIN_NAMESPACE
8 namespace Ui { class MainWindow; }
9 QT_END_NAMESPACE
10
11 class MainWindow : public QMainWindow
12 {
13 Q_OBJECT
14
15 public:
16 MainWindow(QWidget *parent = nullptr);
17 ~MainWindow();
18
19 private slots:
20 void on_pushButton_4_clicked();
21
22 void on_pushButton_3_clicked();
23
24 void on_pushButton_13_clicked();
25
26 void on_pushButton_2_clicked();
27
28 void on_pushButton_6_clicked();
29
30 void on_pushButton_5_clicked();
31
32 void on_pushButton_14_clicked();
33
34 void on_pushButton_16_clicked();
35
36 void on_pushButton_15_clicked();
37
38 void on_pushButton_clicked();
39
40 void on_pushButton_17_clicked();
41
42 void on_pushButton_18_clicked();
43
44 void on_pushButton_8_clicked();
45
46 void on_pushButton_7_clicked();
47
48 void on_pushButton_19_clicked();
49
50 void on_pushButton_10_clicked();
51
52 void on_pushButton_9_clicked();
53
54 void on_pushButton_20_clicked();
55
56 void on_pushButton_12_clicked();
57
58 void on_pushButton_11_clicked();
59
60 void on_pushButton_21_clicked();
61
62 private:
63 Ui::MainWindow *ui;
64 QHash<QString, int> m_pHash;
65 };
66 #endif // MAINWINDOW_H
View Code
mainwindow.cpp
1 #include "mainwindow.h"
2 #include "ui_mainwindow.h"
3
4 MainWindow::MainWindow(QWidget *parent)
5 : QMainWindow(parent)
6 , ui(new Ui::MainWindow)
7 {
8 ui->setupUi(this);
9 setWindowTitle(QStringLiteral("Qt之QHash的使用分析"));
10 }
11
12 MainWindow::~MainWindow()
13 {
14 delete ui;
15 }
16
17 void MainWindow::on_pushButton_4_clicked()
18 {
19 m_pHash.insert("key 2", 2);
20 m_pHash.insert("key 0", 0);
21 m_pHash.insert("key 1", 1);
22 }
23
24 void MainWindow::on_pushButton_3_clicked()
25 {
26 m_pHash["333"] = 333;
27 }
28
29 void MainWindow::on_pushButton_13_clicked()
30 {
31 m_pHash.insertMulti("three",4);
32 m_pHash.insertMulti("three",5);
33 m_pHash.insertMulti("three",6);
34 }
35
36 void MainWindow::on_pushButton_2_clicked()
37 {
38 if(!m_pHash.contains("333"))
39 ui->textEdit->append("contains:true");
40 else
41 ui->textEdit->append("contains:false");
42 }
43
44 void MainWindow::on_pushButton_6_clicked()
45 {
46 ui->textEdit->append("m_pHash[333]:" + QString::number(m_pHash["333"]));
47 }
48
49 void MainWindow::on_pushButton_5_clicked()
50 {
51 QList<QString> skeys = m_pHash.keys();
52 for(int i = 0; i< skeys.count(); i++)
53 {
54 ui->textEdit->append("skeys:" + skeys[i]);
55 }
56 }
57
58 void MainWindow::on_pushButton_14_clicked()
59 {
60 QList<QString> skeys2 = m_pHash.keys(4);
61 for(int i=0; i < skeys2.count(); i++)
62 {
63 ui->textEdit->append("skeys2:" + skeys2[i]);
64 }
65 }
66
67 void MainWindow::on_pushButton_16_clicked()
68 {
69 QList<int> svalues = m_pHash.values();
70 for(int i = 0; i < svalues.count(); i++)
71 {
72 ui->textEdit->append("svalues:" + QString::number(svalues[i]));
73 }
74 }
75
76 void MainWindow::on_pushButton_15_clicked()
77 {
78 QList<int> svalues2 = m_pHash.values("three");
79 for(int i=0; i<svalues2.count(); i++)
80 {
81 ui->textEdit->append("svalues2:" + QString::number(svalues2[i]));
82 }
83 }
84
85 void MainWindow::on_pushButton_clicked()
86 {
87 QHashIterator<QString, int> it(m_pHash);
88 while(it.hasNext())
89 {
90 it.next();
91 ui->textEdit->append("QHashIterator:" + it.key() + " : " + QString::number(it.value()));
92 }
93 }
94
95 void MainWindow::on_pushButton_17_clicked()
96 {
97 QHash<QString,int>::iterator it = m_pHash.find("333");
98 ui->textEdit->append("find 333:" + QString::number(it.value()));
99 }
100
101 void MainWindow::on_pushButton_18_clicked()
102 {
103 QList <QString> suniqueKeys = m_pHash.uniqueKeys();
104 for(int i = 0; i < suniqueKeys.count(); i++)
105 {
106 ui->textEdit->append("uniqueKeys:" + suniqueKeys[i]);
107 }
108 }
109
110 void MainWindow::on_pushButton_8_clicked()
111 {
112 ui->textEdit->append("size:" + QString::number(m_pHash.size()));
113 }
114
115 void MainWindow::on_pushButton_7_clicked()
116 {
117 ui->textEdit->append("count:" + QString::number(m_pHash.count()));
118 }
119
120 void MainWindow::on_pushButton_19_clicked()
121 {
122 ui->textEdit->append("isEmpty:" + QString::number(m_pHash.isEmpty()));
123 }
124 // 用Java风格迭代器进行遍历
125 void MainWindow::on_pushButton_10_clicked()
126 {
127 QHashIterator<QString,int> i(m_pHash);
128 i.toFront();
129 while(i.hasNext())
130 {
131 ui->textEdit->append("hasNext:" + i.key() + " : " + QString::number(i.next().value()));
132 }
133 i.toBack();
134 while(i.hasPrevious())
135 {
136 ui->textEdit->append("hasPrevious:" + i.key() + " : " + QString::number(i.previous().value()));
137 }
138 // bool jjj = i.findNext(2);
139 // if (jjj)
140 // qDebug() << "jjj: " << i.key() << i.value();
141
142 // bool kkk = i.findPrevious(2);
143 // if (kkk )
144 // qDebug() << "kkk : " << i.key() << i.value();
145 }
146 // 用STL风格迭代器进行遍历
147 void MainWindow::on_pushButton_9_clicked()
148 {
149 QHash<QString, int>::const_iterator constI;
150 for(constI = m_pHash.cbegin(); constI != m_pHash.cend(); constI++)
151 ui->textEdit->append("constI:" + constI.key() + " : " + QString::number(constI.value()));
152
153 QHash<QString,int>::iterator itI;
154 for(itI = m_pHash.begin();itI != m_pHash.end();itI++)
155 ui->textEdit->append("itI:" + itI.key() + " : " + QString::number(itI.value()));
156 }
157 // 用foreach进行遍历
158 void MainWindow::on_pushButton_20_clicked()
159 {
160 foreach(const QString &str, m_pHash.keys())
161 ui->textEdit->append("foreach: " + str + " : " + QString::number(m_pHash.value(str)));
162 // 对于多值映射，可以使用两重foreach语句
163 foreach(const QString &str, m_pHash.uniqueKeys())
164 {
165 foreach(int i, m_pHash.values(str))
166 ui->textEdit->append("uniqueKeys: " + str + " : " + QString::number(i));
167 }
168 }
169
170 void MainWindow::on_pushButton_12_clicked()
171 {
172 m_pHash.take("333");
173 ui->textEdit->append("take: " + QString::number(m_pHash.count()));
174 }
175
176 void MainWindow::on_pushButton_11_clicked()
177 {
178 m_pHash.remove("key 2");
179 ui->textEdit->append("remove: " + QString::number(m_pHash.count()));
180 }
181
182 void MainWindow::on_pushButton_21_clicked()
183 {
184 m_pHash.clear();
185 ui->textEdit->append("clear: " + QString::number(m_pHash.count()));
186 }
View Code
mainwindow.ui
1 <?xml version="1.0" encoding="UTF-8"?> 2 <ui version="4.0"> 3 <class>MainWindow</class> 4 <widget class="QMainWindow" name="MainWindow"> 5 <property name="geometry"> 6 <rect> 7 <x>0</x> 8 <y>0</y> 9 <width>704</width> 10 <height>281</height> 11 </rect> 12 </property> 13 <property name="windowTitle"> 14 <string>MainWindow</string> 15 </property> 16 <widget class="QWidget" name="centralwidget"> 17 <layout class="QHBoxLayout" name="horizontalLayout"> 18 <item> 19 <layout class="QVBoxLayout" name="verticalLayout"> 20 <item> 21 <widget class="QTextEdit" name="textEdit"/> 22 </item> 23 <item> 24 <layout class="QHBoxLayout" name="horizontalLayout_3"> 25 <item> 26 <widget class="QPushButton" name="pushButton_4"> 27 <property name="text"> 28 <string>增加元素1</string> 29 </property> 30 </widget> 31 </item> 32 <item> 33 <widget class="QPushButton" name="pushButton_3"> 34 <property name="text"> 35 <string>增加元素2</string> 36 </property> 37 </widget> 38 </item> 39 <item> 40 <widget class="QPushButton" name="pushButton_13"> 41 <property name="text"> 42 <string>增加元素3</string> 43 </property> 44 </widget> 45 </item> 46 </layout> 47 </item> 48 <item> 49 <layout class="QHBoxLayout" name="horizontalLayout_2"> 50 <item> 51 <widget class="QPushButton" name="pushButton_2"> 52 <property name="text"> 53 <string>是否已经包含</string> 54 </property> 55 </widget> 56 </item> 57 <item> 58 <spacer name="horizontalSpacer"> 59 <property name="orientation"> 60 <enum>Qt::Horizontal</enum> 61 </property> 62 <property name="sizeHint" stdset="0"> 63 <size> 64 <width>40</width> 65 <height>20</height> 66 </size> 67 </property> 68 </spacer> 69 </item> 70 </layout> 71 </item> 72 <item> 73 <layout class="QHBoxLayout" name="horizontalLayout_4"> 74 <item> 75 <widget class="QPushButton" name="pushButton_6"> 76 <property name="text"> 77 <string>取值</string> 78 </property> 79 </widget> 80 </item> 81 <item> 82 <widget class="QPushButton" name="pushButton_5"> 83 <property name="text"> 84 <string>取Keys</string> 85 </property> 86 </widget> 87 </item> 88 <item> 89 <widget class="QPushButton" name="pushButton_14"> 90 <property name="text"> 91 <string>取Keys2</string> 92 </property> 93 </widget> 94 </item> 95 <item> 96 <widget class="QPushButton" name="pushButton_16"> 97 <property name="text"> 98 <string>取values</string> 99 </property> 100 </widget> 101 </item> 102 <item> 103 <widget class="QPushButton" name="pushButton_15"> 104 <property name="text"> 105 <string>取values2</string> 106 </property> 107 </widget> 108 </item> 109 <item> 110 <widget class="QPushButton" name="pushButton"> 111 <property name="text"> 112 <string>QMapIterator</string> 113 </property> 114 </widget> 115 </item> 116 <item> 117 <widget class="QPushButton" name="pushButton_17"> 118 <property name="text"> 119 <string>查找find</string> 120 </property> 121 </widget> 122 </item> 123 <item> 124 <widget class="QPushButton" name="pushButton_18"> 125 <property name="text"> 126 <string>uniqueKeys</string> 127 </property> 128 </widget> 129 </item> 130 </layout> 131 </item> 132 <item> 133 <layout class="QHBoxLayout" name="horizontalLayout_5"> 134 <item> 135 <widget class="QPushButton" name="pushButton_8"> 136 <property name="text"> 137 <string>总元素size</string> 138 </property> 139 </widget> 140 </item> 141 <item> 142 <widget class="QPushButton" name="pushButton_7"> 143 <property name="text"> 144 <string>总元素count</string> 145 </property> 146 </widget> 147 </item> 148 <item> 149 <widget class="QPushButton" name="pushButton_19"> 150 <property name="text"> 151 <string>判空isEmpty</string> 152 </property> 153 </widget> 154 </item> 155 </layout> 156 </item> 157 <item> 158 <layout class="QHBoxLayout" name="horizontalLayout_6"> 159 <item> 160 <widget class="QPushButton" name="pushButton_10"> 161 <property name="text"> 162 <string>Java风格迭代器</string> 163 </property> 164 </widget> 165 </item> 166 <item> 167 <widget class="QPushButton" name="pushButton_9"> 168 <property name="text"> 169 <string>STL风格迭代器</string> 170 </property> 171 </widget> 172 </item> 173 <item> 174 <widget class="QPushButton" name="pushButton_20"> 175 <property name="text"> 176 <string>foreach</string> 177 </property> 178 </widget> 179 </item> 180 </layout> 181 </item> 182 <item> 183 <layout class="QHBoxLayout" name="horizontalLayout_7"> 184 <item> 185 <widget class="QPushButton" name="pushButton_12"> 186 <property name="text"> 187 <string>取走take</string> 188 </property> 189 </widget> 190 </item> 191 <item> 192 <widget class="QPushButton" name="pushButton_11"> 193 <property name="text"> 194 <string>移除remove</string> 195 </property> 196 </widget> 197 </item> 198 <item> 199 <widget class="QPushButton" name="pushButton_21"> 200 <property name="text"> 201 <string>清空clear</string> 202 </property> 203 </widget> 204 </item> 205 </layout> 206 </item> 207 </layout> 208 </item> 209 </layout> 210 </widget> 211 </widget> 212 <resources/> 213 <connections/> 214 </ui>View Code
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<iframe></iframe>标签：分析,clicked,Qt,void,MainWindow,ui,pHash,QHash,pushButton 来源： https://www.cnblogs.com/FKdelphi/p/16416115.html