CODEWITHSUNDEEP
c++qt
Gage Ervin
Gage Ervin

Reputation: 105

Qt, cannot instantiate an object in a window's constructor?

How do I create an instance of an object in the constructor for a window? I am generating three errors just by declaring a pointer, named objects, in 'window.h' and instantiating it in 'window.cpp:' 'Window::Window(...){...objects = new objectHandler(1)}'

window.obj:-1: error: LNK2019: unresolved external symbol "public: __thiscall objectHandler::objectHandler(int)" (??0objectHandler@@QAE@H@Z) referenced in function "public: __thiscall Window::Window(class QWidget *)" (??0Window@@QAE@PAVQWidget@@@Z)
(file not found)

window.obj:-1: error: LNK2019: unresolved external symbol "public: __thiscall objectHandler::~objectHandler(void)" (??1objectHandler@@QAE@XZ) referenced in function "public: void * __thiscall objectHandler::`scalar deleting destructor'(unsigned int)" (??_GobjectHandler@@QAEPAXI@Z)
(file not found)

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

I looked up the errors and apparently they have to do with the functions being declared but not defined by the class. I am sure; however, that all functions declared in 'objectHandler.h' are defined in 'objectHandler.cpp' and Qt Creator even knows how to find one from the other. I am quite perplexed so thank you for your help in advance.

From window.cpp

Window::Window(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Window)
{
...
    objects = new objectHandler(STEP_TIME_HOURS);
    ui->setupUi(this);
}

From window.h

namespace Ui {
class Window;
}

class Window : public QWidget
{
    Q_OBJECT

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

From objecthandler.cpp

objectHandler::objectHandler(int stepTimeHours)
{
    this->stepTimeHours = stepTimeHours;
    head = nullptr;
    current = nullptr;
    tail = nullptr;
}

objectHandler::~objectHandler()
{
    current = head;
    if (current->next)
    {
        current = current->next;
        delete current->last;
    }
    else if (current)
        delete current;
}...

From objecthandler.h

class objectHandler
{
public:
    objectHandler(int stepTimeHours);
    ~objectHandler();
...
    largeBody *head, *current, *tail;
}

Upvotes: 1

Views: 1170

Answers (1)

Gage Ervin
Gage Ervin

Reputation: 105

I solved it. The issue below is similar except QT Creator automagically added my '.h' files to the list in the .pro file. I just needed to delete the build folder and suddenly everything started working.

Why doesn't Qt Creator find included headers in included paths - even though qmake is able to find them

Upvotes: 1

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