Problem with simple Class

LooQ

Hi,
I'm newbie in Qt, I'm created my own very simple class. And when I want to create some object of my class something goes wrong. I don't know what's going on. Probably I missed something in code. Let take a look on my code. Thanks!

My class: tree.h

@#ifndef TREE_H
#define TREE_H

#include <QPoint>

class Tree
{

public:

QPoint wsp;
int stan;

Tree();
Tree(int Tstan, int Twsp_x, int Twsp_y);
Tree(const Tree & Ttree);

};

#endif // TREE_H
@

TREE.CPP

@#include "Tree.h"

Tree::Tree()
{
}

Tree::Tree(const Tree &Ttree)
{
stan = Ttree.stan;
wsp = Ttree.wsp;

}

Tree::Tree(int Tstan, int Twsp_x, int Twsp_y)
{
stan = Tstan;
wsp.setX(Twsp_x);
wsp.setY(Twsp_y);
}
@

And the last one main.cpp
@#include <QApplication>
#include <QVector>
#include "drzewo.h"
#include "window.h"

int main(int argc, char *argv[])
{
// QVector <Tree> Forest;
Tree One(20,20,0); // <- Here is the problem

QApplication a(argc, argv);
window w;
w.show();

return a.exec&#40;&#41;;

}
@

This is very simple and works perfect in clear C++ in VS2012 but in QT something goes wrong.

My error looks like this:
@main.obj:-1: error:LNK2019: unresolved external symbol "public: __cdecl Tree::Tree(int,int,int)" (??0Tree@@QEAA@HHH@Z) referenced in function main

debug\Fire.exe:-1: error:LNK1120: 1 unresolved externals@

sierdzio

Wrong include... in main.cpp you are including "drzewo.h" but your header is called "Tree.h".

LooQ

There is "Tree.h" for now, but error is the same :(

SGaist

Do you compile tree.cpp ?

LooQ

When I was trying to do this I received this error :

@22:41:09: Running steps for project Fire...
22:41:09: Configuration unchanged, skipping qmake step.
22:41:09: Starting: "D:\Qt\Qt5.0.2\Tools\QtCreator\bin\jom.exe" -f Makefile.Debug debug/Tree.obj
Error: Target debug/Tree.obj doesn't exist.
22:41:09: The process "D:\Qt\Qt5.0.2\Tools\QtCreator\bin\jom.exe" exited with code 2.
Error while building/deploying project Fire (kit: Desktop Qt 5.0.2 MSVC2012 64bit)
When executing step 'Make'
22:41:09: Elapsed time: 00:00.@

SGaist

Can you show the content of your pro file ?

LooQ

Of course,

@#-------------------------------------------------

Project created by QtCreator 2013-06-08T16:27:11

#-------------------------------------------------

QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = Fire
TEMPLATE = app

SOURCES += main.cpp
window.cpp
Tree.cpp

HEADERS += window.h
Tree.h

FORMS += window.ui
@

SGaist

Did you also try the usual: delete the shadow build and rebuild the project ?

LooQ

Yes, I did. This is not helping me. I have a question : When I want to create my own Class (CTRL+N) > C++ Class. Do I have to set up Base Class (QObject etc. ) ?

sierdzio

[quote author="LooQ" date="1370728174"]When I want to create my own Class (CTRL+N) > C++ Class. Do I have to set up Base Class (QObject etc. ) ?[/quote]

No, you don't need to. This choice of parent class is just a convenient helper, to be used when needed.