c++ - Qt creator在Linux中对“class::function”的 undefined reference

这个问题类似于之前提出的问题，但是尽管定义了我的类和函数，但Qt仍然无法识别我的类和函数。我在Qt版本仅为5.5而Windows版本为5.11的linux中这样做。在Windows中运行相同的程序时，没有任何错误。

我收到“对QCanBus::instance()的未定义引用”错误

每个QCanBus函数都会发生这种情况。在我来自connectdialogue.cpp的代码段中，仅出现第一个匹配项，并且可以在倒数第二个代码行找到它并给出错误：

“对QCanBus::instance()的未定义引用”

“对QCanBus::plugins()的未定义引用”

尽管在qcanbus.h头文件中定义了这些错误，但仍给出了这些错误。

我尝试在static QCanBus *instance()的QCanBus *instance()行下添加#include或connectdialogue.cpp行，但是随后出现警告：
 当在特色代码段的倒数第二行中明显使用“ QCanBus::instance()，但未使用”时。

如何解决这些错误？

connectdialogue.cpp

 #include "connectdialog.h"
 #include "ui_connectdialog.h"

 #include "qcanbus.h"

ConnectDialog::ConnectDialog(QWidget *parent) :
     QDialog(parent),
     m_ui(new Ui::ConnectDialog)
{
m_ui->setupUi(this);

m_ui->errorFilterEdit->setValidator(new QIntValidator(0, 0x1FFFFFFFU, this));

m_ui->loopbackBox->addItem(tr("unspecified"), QVariant());
m_ui->loopbackBox->addItem(tr("false"), QVariant(false));
m_ui->loopbackBox->addItem(tr("true"), QVariant(true));

m_ui->receiveOwnBox->addItem(tr("unspecified"), QVariant());
m_ui->receiveOwnBox->addItem(tr("false"), QVariant(false));
m_ui->receiveOwnBox->addItem(tr("true"), QVariant(true));

m_ui->canFdBox->addItem(tr("false"), QVariant(false));
m_ui->canFdBox->addItem(tr("true"), QVariant(true));

m_ui->dataBitrateBox->setFlexibleDateRateEnabled(true);

connect(m_ui->okButton, &QPushButton::clicked, this, &ConnectDialog::ok);
connect(m_ui->cancelButton, &QPushButton::clicked, this, &ConnectDialog::cancel);
connect(m_ui->useConfigurationBox, &QCheckBox::clicked,
        m_ui->configurationBox, &QGroupBox::setEnabled);
connect(m_ui->backendListBox, &QComboBox::currentTextChanged,
        this, &ConnectDialog::backendChanged);
connect(m_ui->interfaceListBox, &QComboBox::currentTextChanged,
        this, &ConnectDialog::interfaceChanged);
m_ui->rawFilterEdit->hide();
m_ui->rawFilterLabel->hide();

m_ui->backendListBox->addItems(QCanBus::instance()->plugins());

updateSettings();
 }

qcanbus.h

#ifndef QCANBUS_H
#define QCANBUS_H

#include <QtCore/qobject.h>
#include "qserialbusglobal.h"
#include "qcanbusdevice.h"
#include "qcanbusdeviceinfo.h"

QT_BEGIN_NAMESPACE

class Q_SERIALBUS_EXPORT QCanBus : public QObject
{
    Q_OBJECT

public:
    static QCanBus *instance();
    QStringList plugins() const;

    QList<QCanBusDeviceInfo> availableDevices(const QString &plugin, QString *errorMessage = nullptr) const;

    QCanBusDevice *createDevice(const QString &plugin,
                                const QString &interfaceName,
                                QString *errorMessage = nullptr) const;

private:
    QCanBus(QObject *parent = nullptr);

    Q_DISABLE_COPY(QCanBus)
};

QT_END_NAMESPACE

#endif // QSERIALBUS_H

最佳答案

QCanBus缺少QCanBus.cpp，未声明。