exporting shared DLL class

sDmt

Hi,
I want to make a subdir project that contains two projects: DLLproject (a shared DLL that works as a database reader) and TestProject(a widget application). My DLL has two classes as shown in the snippet below. I need the function getEmployees to return a QMap of Employees to the TestProject.
dllproject.h

#ifndef DLLPROJECT_H
#define DLLPROJECT_H

#include "DLLproject_global.h"
#include "employee.h"
#include <QMap>
#include <QObject>

class DLLPROJECT_EXPORT DLLproject
{
public:
    DLLproject();
    QMap<QString,Employee> getEmployees();

private:
    QMap<QString,Employee> Employees;
};

#endif // DLLPROJECT_H

dllproject.cpp

#include "dllproject.h"

DLLproject::DLLproject()
{
    for(int i = 1; i<11; i++ ){
        Employee emp;
        emp.setName("John"+QString::number(i));
        emp.setAge(20+i);
        Employees.insert(emp.getName(),emp);
    }
}

QMap<QString, Employee> DLLproject::getEmployees(){
    return Employees;
}

employee.h

#ifndef EMPLOYEE_H
#define EMPLOYEE_H

#include <QObject>

class Employee
{
public:
    Employee();
    QString getName();
    void setName(QString name);
    int getAge();
    void setAge(int age);

private:
    QString Name;
    int Age;
};
#endif // EMPLOYEE_H

employee.cpp

#include "employee.h"

Employee::Employee(){
}
QString Employee::getName(){
return  Name;
}
void Employee::setName(QString name){
    this->Name = name;
}
int Employee::getAge(){
    return Age;
}
void Employee::setAge(int age){
    this->Age = age;
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "DLLproject_global.h"
#include "dllproject.h"

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_pushButton_clicked();

private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow(){
    delete ui;
}
void MainWindow::on_pushButton_clicked()
{
    DLLproject dl;
    QMap<QString, Employee> emps = dl.getEmployees();
    QMapIterator<QString,Employee>i(emps);
    while (i.hasNext()) {
        i.next();
        Employee em = i.value();
        ui->listWidget->addItem(em.getName());
    }
}

I successfully shared the DLL with the testProject but when I try to iterate through the QMap of employees I get this error

\Link DLL\LinkDLL\TestProject\mainwindow.cpp:25: error: undefined reference to `Employee::getName()'

P.S. when I use ui->listWidget->addItem(i.key())the code works.
I hope I made the problem clear.
My C++ is very shallow and this might not be the best way do this, so I appreciate if you point me to the right way.

Thanks in advance

SGaist

Hi and welcome to devnet,

You need to also export the Employee class.

sDmt

@SGaist Thank you so much for the quick reply.
I finally managed to do it.