Question

我是GUI设计的新手。在这里，使用DDS（OpenSplice）发送和接收消息（浮点数，整数值）我试图将pushButton添加到我已经存在的标签（显示一些浮动值，如下所示），这样在点击pushButton后，我应该能够看到我的标签中的数据。我尝试在Qt Network sender Example的帮助下添加一个按钮。现在，在构建项目时，我在文件moc_mainwindow.cpp 中得到错误未定义的'MainWindow :: on_pushButton_clicked（）引用。

fastsender.cpp

FastSender::FastSender(QLabel *x, QObject *parent) : QObject(parent) { wSend = x; dataTimer = new QTimer(this); emergency = new QPushButton(tr("Emergency")); buttonBox = new QDialogButtonBox; buttonBox->addButton(emergency,QDialogButtonBox::ActionRole); connect(emergency, SIGNAL(clicked()), this, SLOT(startsending())); connect(dataTimer, SIGNAL(timeout()), this, SLOT(walk())); QVBoxLayout *mainLayout = new QVBoxLayout; mainLayout->addWidget(buttonBox); } void FastSender::startsending() { emergency->setEnabled(false); dataTimer->start(100); // Interval 0 means to refresh as fast as possible } int FastSender::walk() { msg->value= i+0.1; snprintf (buf, MAX_MSG_LEN, "Message no. %d", i); cout << "Writing message: \"" << msg->value << "\"" << endl; status = talker->write(*msg, userHandle); QString s= QString::number(msg->value, 'f',8); wSend->setText(s); }

fastsender.h

class FastSender : public QObject { Q_OBJECT public: explicit FastSender(QObject *parent = 0); FastSender(QLabel *x, QObject *parent = 0); ~FastSender(); signals: private: QTimer* dataTimer; QLabel *wSend; DDS::DomainParticipantFactory_var dpf; DDS::DomainParticipant_var parentDP; DDS::Topic_var signalTopic; DDS::DataReader_var parentReader; DDS::DataWriter_var parentWriter; fw::signalSeq_var msgSeq; char * signalTypeName; fw::signalDataWriter_var talker; fw::signal *msg; DDS::InstanceHandle_t userHandle; DDS::Publisher_var fwPublisher; int alpa; QPushButton *emergency; QDialogButtonBox *buttonBox; public slots: int walk(); int hello(); void startsending(); };

mainwindow.cpp

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); fwdds = new FastWanDDS(ui->label);//receiving values are displayed in label fwdds1 = new FastSender(ui->label_2);//Sending values are displayed in label_2 }

mainwindow.h

Ui::MainWindow *ui; QTimer* timer; int counter; FastWanDDS *fwdds; FastSender *fwdds1;

感谢任何帮助。

注意：仅提供代码的片段

Answer 1

我让它以这种方式工作。这对你有用吗？

<强> mainwindow.cpp

#include "mainwindow.h"
#include "fastsender.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    QLabel* label = new QLabel("unchanged");
    FastSender* fs = new FastSender(label);
    setCentralWidget(fs);
}

MainWindow::~MainWindow()
{

}

<强> fastsender.h

#ifndef FASTSENDER_H
#define FASTSENDER_H

#include <QLabel>
#include <QTimer>
#include <QPushButton>
#include <QDialogButtonBox>
#include <QHBoxLayout>

class FastSender : public QWidget
{
    Q_OBJECT
public:
    FastSender(QLabel* label, QWidget* parent = 0)
        : QWidget(parent)
        , _label(label)
        , _timer(new QTimer)
        , _emergency(new QPushButton(tr("Emergency")))
        , _bbox(new QDialogButtonBox)
    {
        _bbox->addButton(_emergency, QDialogButtonBox::ActionRole);

        QHBoxLayout* layout = new QHBoxLayout;
        layout->addWidget(_label);
        layout->addWidget(_bbox);

        setLayout(layout);

        connect(_emergency, SIGNAL(clicked(bool)), this, SLOT(startsending()));
        connect(_timer, SIGNAL(timeout()), this, SLOT(walk()));
    }

public slots:
    void startsending()
    {
        _emergency->setEnabled(false);
        _timer->start(100);
    }

    int walk()
    {
        _label->setText("changed");
        _emergency->setEnabled(true);
    }

private:
    QLabel* _label;
    QTimer* _timer;
    QPushButton* _emergency;
    QDialogButtonBox* _bbox;
};

#endif // FASTSENDER_H

想要将按钮添加到setTimer和setText

1 个答案: