[SOLVED]mainwindow.obj:-1: error: LNK2019: unresolved external symbol

[bshikari]

I try to compile my program and I get the following errors:

mainwindow.obj:-1: error: LNK2019: unresolved external symbol "public: __thiscall FullGraph::FullGraph(class QWidget *)" (??0FullGraph@@QAE@PAVQWidget@@@Z) referenced in function "private: void __thiscall MainWindow::on_actionExample_triggered(void)" (?on_actionExample_triggered@MainWindow@@AAEXXZ)
 
mainwindow.obj:-1: error: LNK2019: unresolved external symbol "public: void __thiscall FullGraph::setID(int)" (?setID@FullGraph@@QAEXH@Z) referenced in function "private: void __thiscall MainWindow::on_go_button_clicked(void)" (?on_go_button_clicked@MainWindow@@AAEXXZ)
 
debug\GraphIt.exe:-1: error: LNK1120: 2 unresolved externals

mainwindow.obj:-1: error: LNK2019: unresolved external symbol "public: __thiscall FullGraph::FullGraph(class QWidget *)" (??0FullGraph@@QAE@PAVQWidget@@@Z) referenced in function "private: void __thiscall MainWindow::on_actionExample_triggered(void)" (?on_actionExample_triggered@MainWindow@@AAEXXZ)

mainwindow.obj:-1: error: LNK2019: unresolved external symbol "public: void __thiscall FullGraph::setID(int)" (?setID@FullGraph@@QAEXH@Z) referenced in function "private: void __thiscall MainWindow::on_go_button_clicked(void)" (?on_go_button_clicked@MainWindow@@AAEXXZ)

debug\GraphIt.exe:-1: error: LNK1120: 2 unresolved externals

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This is my code:

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QtGui>
#include <QtCore>
#include <QFileDialog>
 
#include "fullgraph.h"
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
public slots:
 
private:
    Ui::MainWindow *ui;
    FullGraph *new_graph;
 
private slots:
    void on_actionAbout_triggered();
    void on_actionQuit_Alt_F4_triggered();
    void on_actionExample_triggered();
    void on_pushButton_clicked();
    void on_go_button_clicked();
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtGui>
#include <QtCore>
#include <QFileDialog>

#include "fullgraph.h"

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT
    
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

public slots:

private:
    Ui::MainWindow *ui;
    FullGraph *new_graph;

private slots:
    void on_actionAbout_triggered();
    void on_actionQuit_Alt_F4_triggered();
    void on_actionExample_triggered();
    void on_pushButton_clicked();
    void on_go_button_clicked();
};

#endif // MAINWINDOW_H

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mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "about.h"
#include "fullgraph.h"
 
 
#include <stdio.h>
#include <string.h>
 
 
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::on_actionAbout_triggered(){
    About new_about;
 
    new_about.setModal(true);
    new_about.exec();
}
 
void MainWindow::on_actionQuit_Alt_F4_triggered(){
    close();
}
 
 
void MainWindow::on_actionExample_triggered()
{
 
    new_graph = new FullGraph(this);
    new_graph->show();
 
}
 
void MainWindow::on_pushButton_clicked()
{
    QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"),
                                                     "",
                                                     tr("Files (*.*)"));
 
    ui->fp_input->setText(fileName);
}
 
 
void MainWindow::on_go_button_clicked()
{
    QString _input = ui->fp_input->text();
    QFile file_in(_input);
 
    //INI LABEL TEXT
    ui->error->setText(" ");
 
    //CHECK FILE EXISTANCE
    if(!file_in.open(QIODevice::ReadOnly | QIODevice::Text)){
        ui->error->setText("File doesn't exist");
        return;
    }
    QTextStream text(&file_in);
 
 
    file_in.close();
 
    new_graph = new FullGraph(this);
    int _id = ui->id_input->text().toInt();
    new_graph->setID(_id);
    new_graph->show();
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "about.h"
#include "fullgraph.h"


#include <stdio.h>
#include <string.h>



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

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_actionAbout_triggered(){
    About new_about;

    new_about.setModal(true);
    new_about.exec();
}

void MainWindow::on_actionQuit_Alt_F4_triggered(){
    close();
}


void MainWindow::on_actionExample_triggered()
{

    new_graph = new FullGraph(this);
    new_graph->show();

}

void MainWindow::on_pushButton_clicked()
{
    QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"),
                                                     "",
                                                     tr("Files (*.*)"));

    ui->fp_input->setText(fileName);
}


void MainWindow::on_go_button_clicked()
{
    QString _input = ui->fp_input->text();
    QFile file_in(_input);

    //INI LABEL TEXT
    ui->error->setText(" ");

    //CHECK FILE EXISTANCE
    if(!file_in.open(QIODevice::ReadOnly | QIODevice::Text)){
        ui->error->setText("File doesn't exist");
        return;
    }
    QTextStream text(&file_in);


    file_in.close();

    new_graph = new FullGraph(this);
    int _id = ui->id_input->text().toInt();
    new_graph->setID(_id);
    new_graph->show();
}

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fullgraph.h

#ifndef FULLGRAPH_H
#define FULLGRAPH_H
 
#include <QDialog>
#include <QtGui>
#include <QtCore>
 
namespace Ui {
class FullGraph;
}
 
class FullGraph : public QDialog
{
    Q_OBJECT
 
public:
    explicit FullGraph(QWidget *parent = 0);
    ~FullGraph();
    void setID(int _ID);
 
private slots:
    void on_browse_fpout_clicked();
    void on_saveit_clicked();
 
private:
    Ui::FullGraph *ui;
    int ID;
    QGraphicsScene *scene;
 
};
 
#endif // FULLGRAPH_H

#ifndef FULLGRAPH_H
#define FULLGRAPH_H

#include <QDialog>
#include <QtGui>
#include <QtCore>

namespace Ui {
class FullGraph;
}

class FullGraph : public QDialog
{
    Q_OBJECT
    
public:
    explicit FullGraph(QWidget *parent = 0);
    ~FullGraph();
    void setID(int _ID);
    
private slots:
    void on_browse_fpout_clicked();
    void on_saveit_clicked();

private:
    Ui::FullGraph *ui;
    int ID;
    QGraphicsScene *scene;

};

#endif // FULLGRAPH_H

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fullgraph.cpp

#include "fullgraph.h"
#include "ui_fullgraph.h"
 
FullGraph::FullGraph(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::FullGraph)
{
    ui->setupUi(this);
    ID = 0;
 
//create graphicsview
    scene = new QGraphicsScene(this);
    ui->graphicsView->setScene(scene);
 
//set cross background
    QBrush brush(Qt::gray, Qt::CrossPattern);
    scene->setBackgroundBrush(brush);
 
}
 
FullGraph::~FullGraph()
{
    delete ui;
}
 
void FullGraph::setID(int _ID)
{
 
    ID = _ID;
 
}
 
void FullGraph::on_browse_fpout_clicked()
{
    QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"),
                                                    "",
                                                    tr("Portable Network Graphics (*.png)"));
    ui->filename_out->setText(fileName);
}
 
void FullGraph::on_saveit_clicked()
{
    QString fileName = ui->filename_out->text();
 
    QImage *image = new QImage(382, 238, QImage::Format_ARGB32_Premultiplied);
    QPainter *p = new QPainter(image);
    p->setRenderHint(QPainter::Antialiasing);
    scene->render(p);
    p->end();
 
    // Save it..
    image->save(fileName, "PNG");
}

#include "fullgraph.h"
#include "ui_fullgraph.h"

FullGraph::FullGraph(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::FullGraph)
{
    ui->setupUi(this);
    ID = 0;

//create graphicsview
    scene = new QGraphicsScene(this);
    ui->graphicsView->setScene(scene);

//set cross background
    QBrush brush(Qt::gray, Qt::CrossPattern);
    scene->setBackgroundBrush(brush);

}

FullGraph::~FullGraph()
{
    delete ui;
}

void FullGraph::setID(int _ID)
{

    ID = _ID;

}

void FullGraph::on_browse_fpout_clicked()
{
    QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"),
                                                    "",
                                                    tr("Portable Network Graphics (*.png)"));
    ui->filename_out->setText(fileName);
}

void FullGraph::on_saveit_clicked()
{
    QString fileName = ui->filename_out->text();

    QImage *image = new QImage(382, 238, QImage::Format_ARGB32_Premultiplied);
    QPainter *p = new QPainter(image);
    p->setRenderHint(QPainter::Antialiasing);
    scene->render(p);
    p->end();

    // Save it..
    image->save(fileName, "PNG");
}

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I do realise the code is highly incomplete, as it does barely nothing at all. I just wanted to check if all this is right before I started codding the rest.
I've checked a lot of forums and threads about this but nothing helped, so I started this one.

Thank you in advance