实例代码：
.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
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 <QTimer>
6 #include <QEventLoop>
7 #include <QDialog>
8 #include <windows.h>
9
10 QT_BEGIN_NAMESPACE
11 namespace Ui { class MainWindow; }
12 QT_END_NAMESPACE
13
14 class MainWindow : public QMainWindow
15 {
16 Q_OBJECT
17
18 public:
19 MainWindow(QWidget *parent = nullptr);
20 ~MainWindow();
21
22 private slots:
23 void on_pushButton_clicked();
24
25 void on_pushButton_2_clicked();
26
27 void on_pushButton_3_clicked();
28
29 void on_pushButton_4_clicked();
30
31 void on_pushButton_5_clicked();
32
33 void on_pushButton_6_clicked();
34
35 private:
36 Ui::MainWindow *ui;
37 QEventLoop loop;//定义一个事件循环
38 };
39 #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之使用QEventLoop说明"));
11 }
12
13 MainWindow::~MainWindow()
14 {
15 delete ui;
16 }
17
18 void MainWindow::on_pushButton_clicked()
19 {
20 loop.exec();
21 ui->textEdit->append(QStringLiteral("loop exec OK!"));
22 }
23
24 void MainWindow::on_pushButton_2_clicked()
25 {
26 loop.quit();
27 ui->textEdit->append(QStringLiteral("loop quit OK!"));
28 }
29
30 void MainWindow::on_pushButton_3_clicked()
31 {
32 ui->textEdit->append(QStringLiteral("Sleep 1 OK!"));
33 Sleep(3000);
34 ui->textEdit->append(QStringLiteral("Sleep 3000 OK!"));
35 }
36
37 void MainWindow::on_pushButton_4_clicked()
38 {
39 ui->textEdit->append(QStringLiteral("QEventLoop 1 OK!"));
40 QEventLoop eventloop;
41 QTimer::singleShot(3000, &eventloop, SLOT(quit()));
42 eventloop.exec();
43 ui->textEdit->append(QStringLiteral("QEventLoop 3000 OK!"));
44 }
45
46 void MainWindow::on_pushButton_5_clicked()
47 {
48 QDialog dlg;
49 dlg.show();
50 ui->textEdit->append(QStringLiteral("QDialog OK!"));
51 }
52
53 void MainWindow::on_pushButton_6_clicked()
54 {
55 QDialog dlg;
56 dlg.show();
57 ui->textEdit->append(QStringLiteral("QDialog QEventLoop OK!"));
58 QEventLoop loop;
59 connect(&dlg, SIGNAL(finished(int)), &loop, SLOT(quit()));
60 loop.exec(QEventLoop::ExcludeUserInputEvents);
61
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>699</width>
10 <height>221</height>
11 </rect>
12 </property>
13 <property name="windowTitle">
14 <string>MainWindow</string>
15 </property>
16 <widget class="QWidget" name="centralwidget">
17 <layout class="QVBoxLayout" name="verticalLayout_2">
18 <item>
19 <layout class="QHBoxLayout" name="horizontalLayout" stretch="2,3">
20 <item>
21 <widget class="QTextEdit" name="textEdit"/>
22 </item>
23 <item>
24 <layout class="QVBoxLayout" name="verticalLayout">
25 <item>
26 <layout class="QHBoxLayout" name="horizontalLayout_3">
27 <item>
28 <widget class="QPushButton" name="pushButton_5">
29 <property name="text">
30 <string>QDialog 直接弹</string>
31 </property>
32 </widget>
33 </item>
34 <item>
35 <widget class="QPushButton" name="pushButton_6">
36 <property name="text">
37 <string>QDialog QEventLoop</string>
38 </property>
39 </widget>
40 </item>
41 </layout>
42 </item>
43 <item>
44 <layout class="QHBoxLayout" name="horizontalLayout_2">
45 <item>
46 <widget class="QPushButton" name="pushButton">
47 <property name="text">
48 <string>loop.exec()</string>
49 </property>
50 </widget>
51 </item>
52 <item>
53 <widget class="QPushButton" name="pushButton_2">
54 <property name="text">
55 <string>loop.quit()</string>
56 </property>
57 </widget>
58 </item>
59 </layout>
60 </item>
61 <item>
62 <layout class="QHBoxLayout" name="horizontalLayout_4">
63 <item>
64 <widget class="QPushButton" name="pushButton_3">
65 <property name="text">
66 <string>Sleep(3000)</string>
67 </property>
68 </widget>
69 </item>
70 <item>
71 <widget class="QPushButton" name="pushButton_4">
72 <property name="text">
73 <string>QEventLoop(3000)</string>
74 </property>
75 </widget>
76 </item>
77 </layout>
78 </item>
79 </layout>
80 </item>
81 </layout>
82 </item>
83 </layout>
84 </widget>
85 </widget>
86 <resources/>
87 <connections/>
88
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