Question

我正在开发qt来开发套接字编程。我在这里发布代码。 “mainwindow.h”

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
namespace Ui {
class MainWindow;
}
static void handler(int sig, siginfo_t *si, void *uc);

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    QTcpSocket *socket;
    void timer();
    void config();


private slots:
    void newconnection();

private:
    Ui::MainWindow *ui;
    QTcpServer *server; 

};
#endif // MAINWINDOW_H

“mainwindow.cpp”

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    static char i;
    ui->setupUi(this);
    sock=socket;
    //    if(!i)
    //    {
    //        connect(ui->start_button,SIGNAL(clicked()),this,SLOT(config()));
    //    }
    //    i=1;
    qDebug()<<i;
}
MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow ::newconnection()
{
    static int i;
    socket=server->nextPendingConnection();
    //connect(socket,SIGNAL(readyRead()),this,SLOT(timer_data_recieve()));
    qDebug()<<"new connection";
    qDebug()<<"server is reading..."<<socket->bytesAvailable();
    qDebug()<<socket->readAll();
    //time->start(1000);   //QT timer started
    if(!i)
        timer();
    i=1;
}
void MainWindow::timer()
{
    timer_t t_id;
    struct sigaction sa;
    struct sigaction arg;
    struct sigevent s_evnt;
    struct itimerspec timer;
    /* Establish handler for notification signal */
    sa.sa_flags = SA_SIGINFO;
    sa.sa_sigaction = handler;
    sigemptyset(&sa.sa_mask);
    s_evnt.sigev_notify = SIGEV_SIGNAL;
    s_evnt.sigev_signo = SIGRTMAX;
    s_evnt.sigev_value.sival_ptr = &t_id;
    if (sigaction(SIGRTMAX, &sa,NULL) == -1)
    {
        perror("sigaction");
    }
    //==============timer vlaues==============
    timer.it_value.tv_sec=0;
    timer.it_value.tv_nsec=20000000;
    timer.it_interval.tv_sec=0;
    timer.it_interval.tv_nsec=20000000;
    if(timer_create(CLOCK_REALTIME,&s_evnt,&t_id)==-1);
    perror("timer create");
    if(timer_settime(t_id,0,&timer,NULL)==-1)
        perror("timer_set_time");
}
void MainWindow::config()
{
    //time=new QTimer(this);
    server=new QTcpServer(this);
    socket=new QTcpSocket(this);
    connect(server,SIGNAL(newConnection()),this,SLOT(newconnection()));
    // connect(time,SIGNAL(timeout()),this,SLOT(timer_data_sending()));
    if(server->listen(QHostAddress::LocalHost,600))
    {
        qDebug()<<"server started";
    }
    else
        qDebug()<<"server not started";
    qDebug()<<MainWindow::server->errorString();
}
static void handler(int sig, siginfo_t *si, void *uc)
{
    // MainWindow w;
    qDebug("in handler");
    // MainWindow *s = static_cast<MainWindow*>(&w);
    static char first_call=1;
    static unsigned sec;
    static long nsec;
    struct timespec start;
    struct timespec curr;
    if (first_call) {
        first_call = 0;
        if (clock_gettime(CLOCK_MONOTONIC, &start) == -1)
            perror("clock_gettime");
    }
    if (clock_gettime(CLOCK_MONOTONIC, &curr) == -1)
        perror("clock_gettime");
    sec = (curr.tv_sec - start.tv_sec);
    nsec = (curr.tv_nsec - start.tv_nsec);
    if (nsec < 0)
    {
        sec--;
        nsec += 1000000000;
    }
    start = curr;

}

“的main.cpp”

 int main(int argc, char *argv[])
    {
        QApplication a(argc, argv);
        MainWindow w;
        w.show();
        w.config();
       return a.exec();
    }

这里evrything工作正常处理程序。但是如果想要访问处理程序数据到socket以发送到客户端，一种方法是声明socket是全局的。但是如何全局decalre以在mainwindow成员函数和处理程序中访问？请建议我。这对我来说非常重要。请不要避免它。注意：qtimer不在这里

Answer 1

您可以为.ui-selectmenu-menu课程使用Singletone Design Pattern架构。您需要创建TCP Socket extends的课程。因此，您将只使用QTcpSocket方法创建一个对象并使用get_instance()方法全局访问，因为在此设计模式中它是public static。您可以浏览Singleton design pattern

Answer 2

documentation包含一个很好的例子，说明如何实现Singleton并将其从C ++导出到QML。

将qtcpsocket类对象声明为全局

2 个答案: