QtQ之QMap的使用分析
作者：互联网
相关资料：
https://blog.csdn.net/markely/article/details/8055961 原文
https://blog.csdn.net/asd1147170607/article/details/105616292 原文
https://download.csdn.net/download/zhujianqiangqq/85798434 CSDN代码包下载
代码实现：
.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_5_clicked();
21
22 void on_pushButton_4_clicked();
23
24 void on_pushButton_10_clicked();
25
26 void on_pushButton_3_clicked();
27
28 void on_pushButton_7_clicked();
29
30 void on_pushButton_6_clicked();
31
32 void on_pushButton_11_clicked();
33
34 void on_pushButton_12_clicked();
35
36 void on_pushButton_13_clicked();
37
38 void on_pushButton_14_clicked();
39
40 void on_pushButton_9_clicked();
41
42 void on_pushButton_8_clicked();
43
44 void on_pushButton_17_clicked();
45
46 void on_pushButton_18_clicked();
47
48 void on_pushButton_2_clicked();
49
50 void on_pushButton_clicked();
51
52 void on_pushButton_19_clicked();
53
54 void on_pushButton_20_clicked();
55
56 void on_pushButton_21_clicked();
57
58 void on_pushButton_16_clicked();
59
60 void on_pushButton_15_clicked();
61
62 void on_pushButton_22_clicked();
63
64 void on_pushButton_25_clicked();
65
66 void on_pushButton_24_clicked();
67
68 void on_pushButton_23_clicked();
69
70 private:
71 Ui::MainWindow *ui;
72 QMap<QString, int> m_pMap;
73 };
74 #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
10 setWindowTitle(QStringLiteral("Qt之QMap的使用分析"));
11 }
12
13 MainWindow::~MainWindow()
14 {
15 delete ui;
16 }
17
18 void MainWindow::on_pushButton_5_clicked()
19 {
20 m_pMap.insert("key 2", 2);
21 m_pMap.insert("key 0", 0);
22 m_pMap.insert("key 1", 1);
23 }
24
25 void MainWindow::on_pushButton_4_clicked()
26 {
27 m_pMap["333"] = 333;
28 }
29
30 void MainWindow::on_pushButton_10_clicked()
31 {
32 m_pMap.insertMulti("three",4);
33 m_pMap.insertMulti("three",5);
34 m_pMap.insertMulti("three",6);
35 }
36
37 void MainWindow::on_pushButton_3_clicked()
38 {
39 if(!m_pMap.contains("333"))
40 ui->textEdit->append("contains:true");
41 else
42 ui->textEdit->append("contains:false");
43 }
44
45 void MainWindow::on_pushButton_7_clicked()
46 {
47 ui->textEdit->append("map[333]:" + QString::number(m_pMap["333"]));
48 }
49
50 void MainWindow::on_pushButton_6_clicked()
51 {
52 QList<QString> skeys = m_pMap.keys();
53 for(int i = 0; i< skeys.count(); i++)
54 {
55 ui->textEdit->append("skeys:" + skeys[i]);
56 }
57 }
58
59 void MainWindow::on_pushButton_11_clicked()
60 {
61 QList<QString> skeys2 = m_pMap.keys(4);
62 for(int i=0; i < skeys2.count(); i++)
63 {
64 ui->textEdit->append("skeys2:" + skeys2[i]);
65 }
66 }
67
68 void MainWindow::on_pushButton_12_clicked()
69 {
70 QList<int> svalues = m_pMap.values();
71 for(int i = 0; i < svalues.count(); i++)
72 {
73 ui->textEdit->append("svalues:" + QString::number(svalues[i]));
74 }
75 }
76
77 void MainWindow::on_pushButton_13_clicked()
78 {
79 QList<int> svalues2 = m_pMap.values("three");
80 for(int i=0; i<svalues2.count(); i++)
81 {
82 ui->textEdit->append("svalues2:" + QString::number(svalues2[i]));
83 }
84 }
85
86 void MainWindow::on_pushButton_14_clicked()
87 {
88 QMapIterator<QString, int> it(m_pMap);
89 while(it.hasNext())
90 {
91 it.next();
92 ui->textEdit->append("QMapIterator:" + it.key() + " : " + QString::number(it.value()));
93 }
94 }
95
96 void MainWindow::on_pushButton_9_clicked()
97 {
98 ui->textEdit->append("size:" + QString::number(m_pMap.size()));
99 }
100
101 void MainWindow::on_pushButton_8_clicked()
102 {
103 ui->textEdit->append("count:" + QString::number(m_pMap.count()));
104 }
105
106 void MainWindow::on_pushButton_17_clicked()
107 {
108 ui->textEdit->append("isEmpty:" + QString::number(m_pMap.isEmpty()));
109 }
110
111 void MainWindow::on_pushButton_18_clicked()
112 {
113 QMap<QString,int>::iterator it = m_pMap.find("333");
114 ui->textEdit->append("find 333:" + QString::number(it.value()));
115 }
116
117 void MainWindow::on_pushButton_2_clicked()
118 {
119 QList <QString> suniqueKeys = m_pMap.uniqueKeys();
120 for(int i = 0; i < suniqueKeys.count(); i++)
121 {
122 ui->textEdit->append("uniqueKeys:" + suniqueKeys[i]);
123 }
124 }
125
126 void MainWindow::on_pushButton_clicked()
127 {
128 int nfirst = m_pMap.first();
129 ui->textEdit->append("first:" + QString::number(nfirst));
130 }
131
132 void MainWindow::on_pushButton_19_clicked()
133 {
134 int nlast = m_pMap.last();
135 ui->textEdit->append("last:" + QString::number(nlast));
136 }
137
138 void MainWindow::on_pushButton_20_clicked()
139 {
140 QString firstKey = m_pMap.firstKey();
141 ui->textEdit->append("firstKey:" + firstKey);
142 }
143
144 void MainWindow::on_pushButton_21_clicked()
145 {
146 QString lastKey = m_pMap.lastKey();
147 ui->textEdit->append("lastKey:" + lastKey);
148 }
149 // 用Java风格迭代器进行遍历
150 void MainWindow::on_pushButton_16_clicked()
151 {
152 QMapIterator<QString,int> i(m_pMap);
153 i.toFront();
154 while(i.hasNext())
155 {
156 ui->textEdit->append("hasNext:" + i.key() + " : " + QString::number(i.next().value()));
157 }
158 i.toBack();
159 while(i.hasPrevious())
160 {
161 ui->textEdit->append("hasPrevious:" + i.key() + " : " + QString::number(i.previous().value()));
162 }
163
164 // bool jjj = i.findNext(2);
165 // if (jjj)
166 // qDebug() << "jjj: " << i.key() << i.value();
167
168 // bool kkk = i.findPrevious(2);
169 // if (kkk )
170 // qDebug() << "kkk : " << i.key() << i.value();
171 }
172 // 用STL风格迭代器进行遍历
173 void MainWindow::on_pushButton_15_clicked()
174 {
175 QMap<QString, int>::const_iterator constI;
176 for(constI = m_pMap.cbegin(); constI != m_pMap.cend(); constI++)
177 ui->textEdit->append("constI:" + constI.key() + " : " + QString::number(constI.value()));
178
179 QMap<QString,int>::iterator itI;
180 for(itI = m_pMap.begin();itI != m_pMap.end();itI++)
181 ui->textEdit->append("itI:" + itI.key() + " : " + QString::number(itI.value()));
182 }
183 // 用foreach进行遍历
184 void MainWindow::on_pushButton_22_clicked()
185 {
186 foreach(const QString &str, m_pMap.keys())
187 ui->textEdit->append("foreach: " + str + " : " + QString::number(m_pMap.value(str)));
188 // 对于多值映射，可以使用两重foreach语句
189 foreach(const QString &str, m_pMap.uniqueKeys())
190 {
191 foreach(int i, m_pMap.values(str))
192 ui->textEdit->append("uniqueKeys: " + str + " : " + QString::number(i));
193 }
194 }
195
196 void MainWindow::on_pushButton_25_clicked()
197 {
198 m_pMap.take("333");
199 ui->textEdit->append("take: " + QString::number(m_pMap.count()));
200 }
201
202 void MainWindow::on_pushButton_24_clicked()
203 {
204 m_pMap.remove("key 2");
205 ui->textEdit->append("remove: " + QString::number(m_pMap.count()));
206 }
207
208 void MainWindow::on_pushButton_23_clicked()
209 {
210 m_pMap.clear();
211 ui->textEdit->append("clear: " + QString::number(m_pMap.count()));
212 }
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>710</width> 10 <height>313</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_4"> 25 <item> 26 <widget class="QPushButton" name="pushButton_5"> 27 <property name="text"> 28 <string>增加元素方式1</string> 29 </property> 30 </widget> 31 </item> 32 <item> 33 <widget class="QPushButton" name="pushButton_4"> 34 <property name="text"> 35 <string>增加元素方式2</string> 36 </property> 37 </widget> 38 </item> 39 <item> 40 <widget class="QPushButton" name="pushButton_10"> 41 <property name="text"> 42 <string>增加元素方式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_3"> 52 <property name="text"> 53 <string>是否已经包含</string> 54 </property> 55 </widget> 56 </item> 57 <item> 58 <widget class="QPushButton" name="pushButton"> 59 <property name="text"> 60 <string>最小键对应的数据</string> 61 </property> 62 </widget> 63 </item> 64 <item> 65 <widget class="QPushButton" name="pushButton_19"> 66 <property name="text"> 67 <string>最大键对应的数据</string> 68 </property> 69 </widget> 70 </item> 71 <item> 72 <widget class="QPushButton" name="pushButton_20"> 73 <property name="text"> 74 <string>最小键</string> 75 </property> 76 </widget> 77 </item> 78 <item> 79 <widget class="QPushButton" name="pushButton_21"> 80 <property name="text"> 81 <string>最大键</string> 82 </property> 83 </widget> 84 </item> 85 </layout> 86 </item> 87 <item> 88 <layout class="QHBoxLayout" name="horizontalLayout_5"> 89 <item> 90 <widget class="QPushButton" name="pushButton_7"> 91 <property name="text"> 92 <string>取值1</string> 93 </property> 94 </widget> 95 </item> 96 <item> 97 <widget class="QPushButton" name="pushButton_6"> 98 <property name="text"> 99 <string>取Keys</string> 100 </property> 101 </widget> 102 </item> 103 <item> 104 <widget class="QPushButton" name="pushButton_11"> 105 <property name="text"> 106 <string>取Keys2</string> 107 </property> 108 </widget> 109 </item> 110 <item> 111 <widget class="QPushButton" name="pushButton_12"> 112 <property name="text"> 113 <string>取values</string> 114 </property> 115 </widget> 116 </item> 117 <item> 118 <widget class="QPushButton" name="pushButton_13"> 119 <property name="text"> 120 <string>取values2</string> 121 </property> 122 </widget> 123 </item> 124 <item> 125 <widget class="QPushButton" name="pushButton_14"> 126 <property name="text"> 127 <string>QMapIterator</string> 128 </property> 129 </widget> 130 </item> 131 <item> 132 <widget class="QPushButton" name="pushButton_18"> 133 <property name="text"> 134 <string>查找find</string> 135 </property> 136 </widget> 137 </item> 138 <item> 139 <widget class="QPushButton" name="pushButton_2"> 140 <property name="text"> 141 <string>uniqueKeys</string> 142 </property> 143 </widget> 144 </item> 145 </layout> 146 </item> 147 <item> 148 <layout class="QHBoxLayout" name="horizontalLayout_6"> 149 <item> 150 <widget class="QPushButton" name="pushButton_9"> 151 <property name="text"> 152 <string>总元素size</string> 153 </property> 154 </widget> 155 </item> 156 <item> 157 <widget class="QPushButton" name="pushButton_8"> 158 <property name="text"> 159 <string>总元素count</string> 160 </property> 161 </widget> 162 </item> 163 <item> 164 <widget class="QPushButton" name="pushButton_17"> 165 <property name="text"> 166 <string>判空isEmpty</string> 167 </property> 168 </widget> 169 </item> 170 </layout> 171 </item> 172 <item> 173 <layout class="QHBoxLayout" name="horizontalLayout_7"> 174 <item> 175 <widget class="QPushButton" name="pushButton_16"> 176 <property name="text"> 177 <string>Java风格迭代器</string> 178 </property> 179 </widget> 180 </item> 181 <item> 182 <widget class="QPushButton" name="pushButton_15"> 183 <property name="text"> 184 <string>STL风格迭代器</string> 185 </property> 186 </widget> 187 </item> 188 <item> 189 <widget class="QPushButton" name="pushButton_22"> 190 <property name="text"> 191 <string>foreach</string> 192 </property> 193 </widget> 194 </item> 195 </layout> 196 </item> 197 <item> 198 <layout class="QHBoxLayout" name="horizontalLayout_8"> 199 <item> 200 <widget class="QPushButton" name="pushButton_25"> 201 <property name="text"> 202 <string>取走take</string> 203 </property> 204 </widget> 205 </item> 206 <item> 207 <widget class="QPushButton" name="pushButton_24"> 208 <property name="text"> 209 <string>移除remove</string> 210 </property> 211 </widget> 212 </item> 213 <item> 214 <widget class="QPushButton" name="pushButton_23"> 215 <property name="text"> 216 <string>清空clear</string> 217 </property> 218 </widget> 219 </item> 220 </layout> 221 </item> 222 </layout> 223 </item> 224 </layout> 225 </widget> 226 </widget> 227 <resources/> 228 <connections/> 229 </ui>View Code
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<iframe></iframe>标签：分析,clicked,QMap,QtQ,pushButton,MainWindow,ui,pMap,void 来源： https://www.cnblogs.com/FKdelphi/p/16415864.html