libevent服务器附带qt界面开发（附带源码）

1.重要功能有登录界面
2.基于libevent实现的服务器的业务功能
利用qt编译libevent

下载这个，其他版本也可以
重要是github上下载，可能有点卡
链接: link

编译流程
1.打开qt然后点下面的红框

2.选cmakelist

3.选编译器

4.最后一步编译

5.编译乐成后库的位置

最后编译乐成后可以丢到/usr/bin里也可以丢到自己的写的步伐的目次下
源码

源码布局如下

下面是libeventuse.cpp

1. #include "libeventuse.h"
2. #include <string.h>
3. #include <errno.h>
4. #include <stdio.h>
5. #include <signal.h>
6. #ifndef _WIN32
7. #include <netinet/in.h>
8. # ifdef _XOPEN_SOURCE_EXTENDED
9. #  include <arpa/inet.h>
10. # endif
11. #include <sys/socket.h>
12. #endif
14. #include <event2/bufferevent.h>
15. #include <event2/buffer.h>
16. #include <event2/listener.h>
17. #include <event2/util.h>
18. #include <event2/event.h>
19. #include"qdebug.h"
22. static const char MESSAGE[] = "Hello, World!\n";
24. static const unsigned short PORT = 9995;
26. static void listener_cb(struct evconnlistener *, evutil_socket_t,
27.     struct sockaddr *, int socklen, void *);
28. static void conn_writecb(struct bufferevent *, void *);
29. static void conn_eventcb(struct bufferevent *, short, void *);
30. static void signal_cb(evutil_socket_t, short, void *);
35. int main3()
36. {
37.     struct event_base *base;
38.     struct evconnlistener *listener;
39.     struct event *signal_event;
41.     struct sockaddr_in sin = {0};
43.     base = event_base_new();//初始化
44.     if (!base) {
45.         fprintf(stderr, "Could not initialize libevent!\n");
46.         return 1;
47.     }
49.     sin.sin_family = AF_INET;
50.     sin.sin_port = htons(PORT);
52.     listener = evconnlistener_new_bind(base, listener_cb, (void *)base,
53.         LEV_OPT_REUSEABLE|LEV_OPT_CLOSE_ON_FREE, -1,
54.         (struct sockaddr*)&sin,
55.         sizeof(sin));//事件监听
57.     if (!listener) {
58.         fprintf(stderr, "Could not create a listener!\n");
59.         return 1;
60.     }
62.     signal_event = evsignal_new(base, SIGINT, signal_cb, (void *)base);//信号事件
64.     if (!signal_event || event_add(signal_event, NULL)<0) {
65.         fprintf(stderr, "Could not create/add a signal event!\n");
66.         return 1;
67.     }
69.     event_base_dispatch(base);//启动
71.     evconnlistener_free(listener);
72.     event_free(signal_event);
73.     event_base_free(base);
75.     printf("done\n");
76.     return 0;
77. }
79. static void
80. listener_cb(struct evconnlistener *listener, evutil_socket_t fd,
81.     struct sockaddr *sa, int socklen, void *user_data)
82. {
83.     struct event_base *base = static_cast<event_base*>(user_data);
84.     struct bufferevent *bev;
86.     bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE);
87.     if (!bev) {
88.         fprintf(stderr, "Error constructing bufferevent!");
89.         event_base_loopbreak(base);
90.         return;
91.     }
92.     bufferevent_setcb(bev, NULL, conn_writecb, conn_eventcb, NULL);
93.     bufferevent_enable(bev, EV_WRITE);
94.     bufferevent_disable(bev, EV_READ);
96.     bufferevent_write(bev, MESSAGE, strlen(MESSAGE));
97. }
99. static void
100. conn_writecb(struct bufferevent *bev, void *user_data)
101. {
102.     struct evbuffer *output = bufferevent_get_output(bev);
103.     if (evbuffer_get_length(output) == 0) {
104.         printf("flushed answer\n");
105.         bufferevent_free(bev);
106.     }
107. }
109. static void
110. conn_eventcb(struct bufferevent *bev, short events, void *user_data)
111. {
112.     if (events & BEV_EVENT_EOF) {
113.         printf("Connection closed.\n");
114.     } else if (events & BEV_EVENT_ERROR) {
115.         printf("Got an error on the connection: %s\n",
116.             strerror(errno));/*XXX win32*/
117.     }
118.     /* None of the other events can happen here, since we haven't enabled
119.      * timeouts */
120.     bufferevent_free(bev);
121. }
123. static void
124. signal_cb(evutil_socket_t sig, short events, void *user_data)
125. {
126.     struct event_base *base = static_cast<event_base*>(user_data);
127.     struct timeval delay = { 2, 0 };
129.     printf("Caught an interrupt signal; exiting cleanly in two seconds.\n");
131.     event_base_loopexit(base, &delay);
132. }
133. libeventuse::libeventuse()
134. {
135.     main3();
136. }

复制代码

下面是mainwindow.cpp

1. #include "mainwindow.h"
2. #include "ui_mainwindow.h"
3. #include "ui_form.h"
4. #include"QString"
5. #include"qdebug.h"
6. #include"qmessagebox.h"
7. #include"libeventuse.h"
10. #include <QMutex>
11. #include <QTime>
12. #include <QWidget>
16. WorkThread::WorkThread(QObject *parent) : QThread(parent) {}
18. void WorkThread::run() {  // 必须实现 run()
19. libeventuse tmp;
20. emit this->server_finish();
21. }
23. MainWindow::MainWindow(QWidget *parent) :
24.     QMainWindow(parent),
25.     ui(new Ui::MainWindow)
26. {
28.     ui->setupUi(this);
29.    login_win=new Form;
30.    workthread=new WorkThread;
31.    login_win->hide();//登录窗口打开
32.    workthread->start();
34.    connect(this->workthread,&WorkThread::server_finish,[=](){
35.             qDebug()<<"服务器关闭";
36.    });
37.    connect(this->workthread,&WorkThread::finished,this->workthread,&QObject::deleteLater);
39.    connect(this->login_win,&Form::back,[=](){//槽函数
40.        this->show();//返回登录界面
41.        this->login_win->hide();//主执行界面关闭
42.    });
46. }
48. MainWindow::~MainWindow()
49. {
50.     delete login_win;
51.     delete ui;
52. }
54. Form::Form(QWidget *parent) :
55.     QWidget(parent),
56.     ui(new Ui::Form)
57. {
58.     ui->setupUi(this);
60. }
62. Form::~Form()
63. {
65.     delete ui;
66. }
68. void MainWindow::on_pushButton_clicked()
69. {
70.     QString RootName=ui->rootName->text();
71.     QString Password=ui->password->text();
72.     if(RootName.size()==0)
73.     {
74.        QMessageBox::information(this, tr("提示"), tr("用户名没有输入"));
75.        return ;
76.     }
77.     else if(RootName.size()==0)
78.     {
79.         QMessageBox::information(this, tr("提示"), tr("密码没有输入"));
80.     }
81.     if(RootName=="i"&&Password=="1")//验证用户和密码
82.     {
83.         qDebug()<<RootName<<Password;
84.         login_win->show();//主执行界面打开
85.         this->hide();//登录界面关闭
86.     }
87.     else
88.     {
89.           QMessageBox::information(this, tr("提示"), tr("用户或密码输入错误"));
90.     }
92. }
94. void Form::on_pushButton_clicked()
95. {
96.     emit this->back();//发送信号
97. }
99. void MainWindow::on_pushButton_2_clicked()
100. {
102. }

复制代码

下面是libeventuse.h

1. #ifndef LIBEVENTUSE_H
2. #define LIBEVENTUSE_H
3. class libeventuse
4. {
5. public:
6.     libeventuse();
7. };
9. #endif // LIBEVENTUSE_H

复制代码

下面是mainwindow.h

1. #ifndef MAINWINDOW_H
2. #define MAINWINDOW_H
4. #include <QMainWindow>
5. namespace Ui {
6. class Form;
7. }
9. class Form : public QWidget
10. {
11.     Q_OBJECT
13. public:
14.     explicit Form(QWidget *parent = 0);
15.     ~Form();
17. private slots:
18.     void on_pushButton_clicked();
19. signals:
20.     void back();
21. private:
22.     Ui::Form *ui;
23. };
26. #include <QThread>
27. class WorkThread : public QThread {
28.     Q_OBJECT  // 必须添加！！！
29. public:
30.     explicit WorkThread(QObject *parent = nullptr);
31. protected:
32.     void run() override;  // 虚函数声明
33. signals:
34. void WorkThread_signal(int b);//自定义的信号
35. void server_finish();
36. };
39. namespace Ui {
40. class MainWindow;
41. }
42. class MainWindow : public QMainWindow
43. {
44.     Q_OBJECT
46. public:
47.     explicit MainWindow(QWidget *parent = 0);
48.     ~MainWindow();
49.    Form* login_win=nullptr;
50.    WorkThread*workthread=nullptr;
51. private slots:
52.    void on_pushButton_clicked();
53.    void on_pushButton_2_clicked();
55. private:
56.     Ui::MainWindow *ui;
57. };
59. #endif // MAINWINDOW_H

复制代码

pro文件的设置

演示视频


     20250415_153450
  
我视频第一部门展示了怎样在qt创建窗口
视频第二部门展示了客户端连接到服务器后会接收到hello world
视频等考核过了我再放上来
考核没过我就发效果图

qt的一些知识

1.信号的格式
signals:
void WorkThread_signal(int b);//自定义的信号
2.注意事项，需要分写入Q_OBJECT才能这么定义
3.信号发送利用 emit 发送

4.利用connect槽函数来绑定信号要处理的逻辑

免责声明：如果侵犯了您的权益，请联系站长，我们会及时删除侵权内容，谢谢合作！更多信息从访问主页：qidao123.com:ToB企服之家，中国第一个企服评测及商务社交产业平台。