Qt creator ошибка lnk2019

I’m getting these three errors and I have no idea why? I am using the Qt program and and the code below goes in a Qt widget project. The mainwindow.ui is not included because I can’t change it anyways. The goal as of now is to get the age into a lineEdit as shown in the mainwindow.cpp file.

I have done things like uninstalled and reinstalled Qt program. Copy and pasted code into a brand new project. Added the header files to cpp files etc etc

Errors:

mainwindow.obj:-1: error: LNK2019: unresolved external symbol "public: __thiscall person::~person(void)" (??1person@@QAE@XZ) referenced in function "public: virtual __thiscall MainWindow::~MainWindow(void)" (??1MainWindow@@UAE@XZ)

and

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

and

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

Here is the code:

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <string>
#include "person.h"

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

 public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void on_lineEdit_returnPressed();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

person.h

#ifndef PERSON_H
#define PERSON_H


class person
{
public:

    int age;

    person();
    person(int);

    ~person();

    int getAge();

    void setAge(int age);
};

#endif // PERSON_H

main.cpp

#include "mainwindow.h"
#include "person.h"
#include <QApplication>
#include <string>

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

    return a.exec();
}

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "person.h"
#include <string>

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

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

void MainWindow::on_lineEdit_returnPressed()
{
    QString str = ui->lineEdit->text();
    std::string age = str.toStdString();
    x.setAge(stoi(age));
    ui->lineEdit_2->setText(str);
}

person.cpp

#include "person.h"
using namespace std;

person::person(int age)
{
    age = 0;
}

person::~person()
{

}

int getAge()
{
    return age;
}

void setAge(int age)
{ 
    age = newAge;
}

I have searched and searched and all I know is for some reason the program can’t find the setAge() method or cant find the person class. I’ve even asked other people who know c++ and have no idea why this is happening. Please help!

Deleting:

person x; //in the mainwindow.h file solves this problem but...

I get the error:

C:\Users\Adam\Documents\Body_fat\mainwindow.cpp:22: error: C3861: 'setAge': identifier not found



void MainWindow::on_lineEdit_returnPressed()
{
    QString str = ui->lineEdit->text();
    std::string age = str.toStdString();
    setAge(stoi(age));
    ui->lineEdit_2->setText(str);
}

I know this question has been asked a lot of times already but I’m sorry, I just can’t figure out what is wrong with what I’ve been doing.

What I want is to read a DICOM image (by pixel because I have to perform operations on it) and display it on a Qt GUI.

I have Windows 8 and Visual Studio 2013. I downloaded Qt opensource and also VS’s plugin for it. I built Qt using cmake-gui. Then, I followed what was said on a discussion here in stackoverflow entitled «How to use DCMTK in Qt». I downloaded DCMTK 3.6.0, configured and generated it using cmake-gui, built its ALL_BUILD and INSTALL projects in VS. So far, everything is successful. Then I tried creating a simple program that will read a DICOM image and display it.

I created a new Qt Application and named it MainWindow. Here is my mainwindow.cpp:

#include "mainwindow.h"
#include <dcmtk\config\osconfig.h>
#include <dcmtk\ofstd\ofcond.h>
#include <dcmtk\ofstd\ofstring.h>
#include <dcmtk\dcmdata\dctk.h>
#include <dcmtk\dcmdata\dcfilefo.h>
#include <dcmtk\dcmdata\dcitem.h>
#include <dcmtk\dcmdata\dcdeftag.h>
#include <dcmtk\dcmdata\dctagkey.h>

void MainWindow::tryDCMTK() {
    DcmFileFormat fileformat;
    OFCondition status = fileformat.loadFile("C:/Users/Kriselle/Documents/000004.dcm");
    if (status.good())
    {
        OFString patientsName;
        if (fileformat.getDataset()->findAndGetOFString(DCM_PatientName, patientsName).good())
        {
            printf("Patient's Name: %s",patientsName);
        }
        else
            printf("Error: cannot access Patient's Name!");
    }
    else
        printf("Error: cannot read DICOM file (%s)", status.text());
}

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) {
    ui.setupUi(this);
}

MainWindow::~MainWindow() {}

mainwindow.h:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtWidgets/QMainWindow>
#include "ui_mainwindow.h"

class MainWindow : public QMainWindow {
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindowClass ui;
    void tryDCMTK();
};

#endif // MAINWINDOW_H

MainWindow.pro

# ----------------------------------------------------
# This file is generated by the Qt Visual Studio Add-in.
# ------------------------------------------------------

TEMPLATE = app
TARGET = MainWindow
DESTDIR = ../Win32/Debug
QT += core widgets gui
CONFIG += debug console
DEFINES += WIN64 QT_DLL QT_WIDGETS_LIB _REENTRANT
INCLUDEPATH += ./GeneratedFiles \
    . \
    ./GeneratedFiles/Debug \
    "C:/Program Files (x86)/DCMTK/include"
DEPENDPATH += .
MOC_DIR += ./GeneratedFiles/debug
OBJECTS_DIR += debug
UI_DIR += ./GeneratedFiles
RCC_DIR += ./GeneratedFiles
HEADERS += ../../../../../../../DICOMSDL/include/dicom.h \
    ./dicomcfg.h \
    ./mainwindow.h
SOURCES += ./main.cpp \
    ./mainwindow.cpp
FORMS += ./mainwindow.ui
RESOURCES += mainwindow.qrc

QMAKE_CFLAGS_RELEASE -= -MD
QMAKE_CFLAGS_RELEASE = -MT
QMAKE_CFLAGS_DEBUG -= -MDd
QMAKE_CFLAGS_DEBUG = -MTd
QMAKE_CXXFLAGS_RELEASE -= -MD
QMAKE_CXXFLAGS_RELEASE += -MT
QMAKE_CXXFLAGS_DEBUG -= -MDd
QMAKE_CXXFLAGS_DEBUG += -MTd

#a example: LIBS += -L"../../../test_dcmtk/DCMTK/lib" \
LIBS += -L"C:/Program Files (x86)/DCMTK/lib" \
-lconfig \
-lofstd \
-ldcmdata \
-loflog \
-lws2_32 \
-lnetapi32 \
-lwsock32 \
-ladvapi32 

When I tried to run it, the following 7 LNK2019 errors occurred:

1>mainwindow.obj : error LNK2019: unresolved external symbol "public: __cdecl OFString::OFString(void)" (??0OFString@@QEAA@XZ) referenced in function "private: void __cdecl MainWindow::tryDCMTK(void)" (?tryDCMTK@MainWindow@@AEAAXXZ)
1>mainwindow.obj : error LNK2019: unresolved external symbol "public: __cdecl OFString::~OFString(void)" (??1OFString@@QEAA@XZ) referenced in function "private: void __cdecl MainWindow::tryDCMTK(void)" (?tryDCMTK@MainWindow@@AEAAXXZ)
1>mainwindow.obj : error LNK2019: unresolved external symbol "public: class OFCondition __cdecl DcmItem::findAndGetOFString(class DcmTagKey const &,class OFString &,unsigned long,bool)" (?findAndGetOFString@DcmItem@@QEAA?AVOFCondition@@AEBVDcmTagKey@@AEAVOFString@@K_N@Z) referenced in function "private: void __cdecl MainWindow::tryDCMTK(void)" (?tryDCMTK@MainWindow@@AEAAXXZ)
1>mainwindow.obj : error LNK2019: unresolved external symbol "public: __cdecl DcmFileFormat::DcmFileFormat(void)" (??0DcmFileFormat@@QEAA@XZ) referenced in function "private: void __cdecl MainWindow::tryDCMTK(void)" (?tryDCMTK@MainWindow@@AEAAXXZ)
1>mainwindow.obj : error LNK2019: unresolved external symbol "public: virtual __cdecl DcmFileFormat::~DcmFileFormat(void)" (??1DcmFileFormat@@UEAA@XZ) referenced in function "private: void __cdecl MainWindow::tryDCMTK(void)" (?tryDCMTK@MainWindow@@AEAAXXZ)
1>mainwindow.obj : error LNK2019: unresolved external symbol "public: class DcmDataset * __cdecl DcmFileFormat::getDataset(void)" (?getDataset@DcmFileFormat@@QEAAPEAVDcmDataset@@XZ) referenced in function "private: void __cdecl MainWindow::tryDCMTK(void)" (?tryDCMTK@MainWindow@@AEAAXXZ)
1>mainwindow.obj : error LNK2019: unresolved external symbol "public: virtual class OFCondition __cdecl DcmFileFormat::loadFile(char const *,enum E_TransferSyntax,enum E_GrpLenEncoding,unsigned long,enum E_FileReadMode)" (?loadFile@DcmFileFormat@@UEAA?AVOFCondition@@PEBDW4E_TransferSyntax@@W4E_GrpLenEncoding@@KW4E_FileReadMode@@@Z) referenced in function "private: void __cdecl MainWindow::tryDCMTK(void)" (?tryDCMTK@MainWindow@@AEAAXXZ)
1>C:\Users\Kriselle\documents\visual studio 2013\Projects\MainWindow\x64\Debug\\MainWindow.exe : fatal error LNK1120: 7 unresolved externals

I have looked into other discussions:
*Link 1** said that the libraries must be linked in properties->linker->additional library dependencies. I already did that. Screenshots of my additional library dependencies and environment variables are available in the zip file attached below.

*Link 2** has a different error output. (I was already past that).
*Link 3** said «look for linker flags/settings inside a project configuration dialog» but I don’t know what’s wrong with my linker settings. I even listed the libraries inside the lib directory in my Additional Dependencies. (A screenshot of my Additional Dependencies is also included in the zip file below.)
I have also done what was suggested at *Link 4**.
Furthermore, I believe I didn’t commit the same mistake as displayed in *Link 5** because I have no parameters for my function.

The images are here: https://db.tt/CmpJndan
The links of online discussions I have looked into are here: https://db.tt/AOsewqUg

As much as I would like to make it easier for you to see the images and navigate to the links, I am very sorry, I can only post a maximum of two links due to my lack of reputation.

Please help me. Thank you very much for your time!

EDIT: I changed the order of my libraries according to their dependencies and added NetAPI32.lib and WSock32.lib to my libraries thanks to the link Hans gave in the comments. But I still get the same errors.

@SGaist I don’t know what’s wrong with it.

The mistake is easy to reproduce.

Two custom designer widgets,examples:

The First custom designer widget code as follows:
[ FirstCustomWidget.pro]
CONFIG += plugin release
TARGET = $$qtLibraryTarget(firstcustomwidgetplugin)
TEMPLATE = lib

HEADERS = firstcustomwidgetplugin.h
SOURCES = firstcustomwidgetplugin.cpp
RESOURCES = icons.qrc
LIBS += -L.

greaterThan(QT_MAJOR_VERSION, 4) {
QT += designer
} else {
CONFIG += designer
}

target.path = $$[QT_INSTALL_PLUGINS]/designer
INSTALLS += target

include(firstcustomwidget.pri)

lib_out_path = $${PWD}/../../LnkTester/build/lib
include_out_path = $${PWD}/../../LnkTester/build/include

$$[QMAKE_SPEC] {
CONFIG(release, debug|release) {
QMAKE_POST_LINK += copy /y release\.dll «$${target.path}» &
QMAKE_POST_LINK += copy /y release\.dll «$${lib_out_path}» &
QMAKE_POST_LINK += copy /y release\*.lib «$${lib_out_path}»
}
}

[FirstCustomWidget.h]
#ifndef FIRSTCUSTOMWIDGET_H
#define FIRSTCUSTOMWIDGET_H

#include <QWidget>
#include <QLabel>
#include <QPixmap>
#include <QtUiPlugin/QDesignerExportWidget>

class QDESIGNER_WIDGET_EXPORT FirstCustomWidget : public QWidget
{
Q_OBJECT
public:
FirstCustomWidget(QWidget * parent = 0);
private:
QLabel * _label;
};
#endif

[ FirstCustomWidget.cpp]
#include «firstcustomwidget.h»

FirstCustomWidget::FirstCustomWidget(QWidget * parent) :
QWidget(parent), _label(new QLabel(this))
{
}

[firstcustomwidgetplugin.h] [firstcustomwidgetplugin.cpp]
These two files are generic

The Second custom designer widget code as follows:
[SecondCustomWidget.pro]
CONFIG += plugin release
TARGET = $$qtLibraryTarget(secondcustomwidgetplugin)
TEMPLATE = lib

HEADERS = secondcustomwidgetplugin.h
SOURCES = secondcustomwidgetplugin.cpp
RESOURCES = icons.qrc
LIBS += -L.

greaterThan(QT_MAJOR_VERSION, 4) {
QT += designer
} else {
CONFIG += designer
}

target.path = $$[QT_INSTALL_PLUGINS]/designer
INSTALLS += target

include(secondcustomwidget.pri)

lib_out_path = $${PWD}/../../LnkTester/build/lib

INCLUDEPATH += $${PWD}/../../LnkTester/FirstCustomWidget

$$[QMAKE_SPEC] {
CONFIG(release, debug|release) {
LIBS += -L$${lib_out_path} -lfirstcustomwidgetplugin
}
}

[secondcustomwidget.h]
#ifndef SECONDCUSTOMWIDGET_H
#define SECONDCUSTOMWIDGET_H

#include <QWidget>
#include <QtUiPlugin/QDesignerExportWidget>
#include «firstcustomwidget.h»

class QDESIGNER_WIDGET_EXPORT SecondCustomWidget : public QWidget
{
Q_OBJECT
public:
SecondCustomWidget(QWidget * parent = 0);
~SecondCustomWidget();
private:
FirstCustomWidget *_cwidget;
};

#endif

[secondcustomwidget.cpp]
#include «secondcustomwidget.h»

SecondCustomWidget::SecondCustomWidget(QWidget *parent) :
QWidget(parent),_cwidget(new FirstCustomWidget(this))
{
}

SecondCustomWidget::~SecondCustomWidget()
{
delete _cwidget;
}

[secondcustomwidgetplugin.h] [secondcustomwidgetplugin.cpp]
These two files are generic

the lnk error is as follows:
Generating Code…
link /NOLOGO /DYNAMICBASE /NXCOMPAT /INCREMENTAL:NO /DLL /SUBSYSTEM:WINDOWS /OUT:release\secondcustomwidgetplugin.dll @E:\TEMP\nm4C1A.tmp
Creating library release\secondcustomwidgetplugin.lib and object release\secondcustomwidgetplugin.exp
secondcustomwidgetplugin.obj : error LNK2019: unresolved external symbol «public: static struct QMetaObject const FirstCustomWidget::staticMetaObject» (?staticMetaObject@FirstCustomWidget@@2UQMetaObject@@B) referenced in function «public: static class QString __cdecl FirstCustomWidget::tr(char const *,char const *,int)» (?tr@FirstCustomWidget@@SA?AVQString@@PBD0H@Z)
secondcustomwidget.obj : error LNK2001: unresolved external symbol «public: static struct QMetaObject const FirstCustomWidget::staticMetaObject» (?staticMetaObject@FirstCustomWidget@@2UQMetaObject@@B)
moc_secondcustomwidget.obj : error LNK2001: unresolved external symbol «public: static struct QMetaObject const FirstCustomWidget::staticMetaObject» (?staticMetaObject@FirstCustomWidget@@2UQMetaObject@@B)
release\secondcustomwidgetplugin.dll : fatal error LNK1120: 1 unresolved externals

Здравствуйте, уважаемые программисты C++. Программирую игру на Qt. Собирался было уже делать управление игроком, но тут ошибка : LNK2019. Вот сама ошибка: player.obj:-1: error: LNK2019: « __imp_GetAsyncKeyState «public: void __cdecl Player::moving(void)» (?moving@Player@@QEAAXXZ). Пробовал найти решение, там говорят что нужно перезапустить qmake, но не помогает. Вот код игры:

Player.h:

#pragma once

#include <QObject>
#include <QGraphicsItem>
#include <QTimer>
#include <QPixmap>
#include <QPainter>
#include <QLabel>



class Player: public QObject, public QGraphicsItem
{
    Q_OBJECT

public:
    Player(QObject *parent = 0);
    int pWidth = 110;
    int pHeigth = 110;
    int x = 205;
    int y = 400;


public slots:
    void moving();

private:
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,QWidget *widget) override;
    QRectF boundingRect() const override;
    QPixmap  *spriteImage; // В данный объект pixmap будет помещен спрайт



};

View.h:

#pragma once

#include <QGraphicsView>
#include <QGraphicsScene>
#include <QObject>

#include "player.h"

class View :public QGraphicsView
{
public:
    View();
    void view_elements();
    void gameStarted();


private:
    QGraphicsScene mainScene;
    Player pl;
    QTimer     *timer; // Таймер


};

main.cpp:

#include "view.h"
#include <QtWidgets>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    View v;
    v.show();

    return a.exec();
}

View.cpp:

#include "view.h"
#include "player.h"

#include <QObject>
#include <QTimer>

View::View()
{

    setWindowTitle("Space Rangers");

    setRenderHint(QPainter::Antialiasing);

    setFrameStyle(0);
    setSceneRect(0, 0, 500,600);
    setFixedSize(500, 600);

    mainScene.setSceneRect(0, 0, 500,600);
    mainScene.setItemIndexMethod(QGraphicsScene::NoIndex);
    setScene(&mainScene);

    timer = new QTimer();
    connect(timer, &QTimer::timeout, &pl, &Player::moving);
    view_elements();


}

void View::view_elements(){

    pl.setPos(205, 400);
    mainScene.addItem(&pl);


}

Player.cpp:

#include "player.h"

#include <QtWidgets>

using namespace Qt;

Player::Player(QObject *parent):QObject(parent), QGraphicsItem()
{
    spriteImage = new QPixmap();
    spriteImage->load(":/Player.png");

}

QRectF Player::boundingRect() const{

    return QRectF(0, 0, pWidth, pHeigth);
}

void Player::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,QWidget *widget){

    painter->drawPixmap(0, 0, pWidth, pHeigth, *spriteImage);
    Q_UNUSED(option);
    Q_UNUSED(widget);

}

void Player::moving()
{
//*******************Обработка нажатий клавиш на клавиатуре*********************************************

    if(GetAsyncKeyState(VK_LEFT)){
        setPos(mapToParent(-4, 0));
    }

    if(GetAsyncKeyState(VK_RIGHT)){
        setPos(mapToParent(4, 0));
    }

    if(GetAsyncKeyState(VK_UP)){
        setPos(mapToParent(0, 5));
    }

    if(GetAsyncKeyState(VK_DOWN)){
        setPos(mapToParent(0, -4));
    }
}

Буду очень благодарен за ответ.