QT Creator - LNK2019 error when editing the MainWindow.cpp constructor code

Psycho_Path

Added an InitMain function to a brand new QT Widget -> QT Gui Application so that my code calls the InitMain in the MainWindow's constructor. When compiling I get this error:

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

Any help on resolving this issue would be much appreciated

koahnig

Welcome to devnet

Do you have InitMain in the same source file as MainWindow?

Psycho_Path

Yes. Here's the .h and .cpp files for MainWindow (everything's default per the project creator other than the InitMain() function stuff)

@
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

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

private:
Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H
@

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

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

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

void InitMain()
{
int i = 5;
i++;
}
@

(I do realize that at this time InitMain is a pointless function)

koahnig

Please tag your code with '@' as explained "here ":http://developer.qt.nokia.com/wiki/ForumHelp#e3f82045ad0f480d3fb9e0ac2d58fb01

koahnig

You have implemented an independent function called InitMain(). You may do this, but you have declared a member function of MainWindow calls.

You should write:
@
void MainWindows :: InitMain()
{
int i = 5;
i++;
}
@

Psycho_Path

My appologies on not using the 'at' symbol. Thanks also for the solution. Checking it now. I'm not yet used to using the class definition before methods/functions