Objective C++ and Qt

ksiedzulek

Hi,

I would like to mix up objective C++ and Qt to work bluetooth in my mac desktop project. here is what I did for testing and it's not working. It's 'no sense code', but I would like to run it without errors:

@
//untitled.pro

QT += core gui

TARGET = untitled
TEMPLATE = app

SOURCES += main.cpp

mac {
OBJECTIVE_HEADERS += mainwindow.h

OBJECTIVE_SOURCES += mainwindow.mm

}

//mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

class MainWindow{

public:
MainWindow();
~MainWindow();
};

#endif // MAINWINDOW_H

//mainwindow.mm

#include "mainwindow.h"
#include <Foundation/Foundation.h>

MainWindow::MainWindow()
{
NSString *s= @"string"; //if I take this line in a comment of corse it's working
}

MainWindow::~MainWindow()
{

}

@

Why it doesn't work?

goetz

You need to add this line to your .pro file:

@
LIBS += -framework Foundation
@

ksiedzulek

really helpful, thank you Volker

goetz

If you're using Qt Creator, then unfortunately the error pane doesn't show that useful error messages. It's just a "symbol(s) not found" and "collect2: ld returned exit status 1". You should go to the compilation pane then, the error messages there are more elaborate.

In your special case here, if you use a Mac framework, you will have to add it to the LIBS variable. Some of them are added by Qt by default, some need manual addition.