Cannot open file in resources directory - c++

Question

I've tested every natural iteration that I can imagine right now but still can not successfully open a file with a QFile object. I've also tested placing the file in the ./resources directory and in the directory with the source file.
I've cleaned my project in between each test and restarted Qt Creator as well. I've also deleted my *.pro.user project configuration file and tested with new versions of that.
#include <QFile>
#include <QDebug>
...
//QFile input_file("./resources/testfile.txt");
//QFile input_file("qrc:/10_graph.txt");
//QFile input_file("testfile.txt");
QFile input_file(":/testfile.txt");
if (!input_file.exists()) {
qDebug() << "File does NOT exist";
exit(11);
}
Qt Creator >> About
Qt Creator 3.1.1 (opensource)
Based on Qt 5.2.1 (Clang 5.0 (Apple), 64 bit)

Answer 1

You should add a resource file to your project and add the testfile.txt to the resources. After that you can access the file from resources by :
QFile input_file(":/testfile.txt");
If you add a prefix to the resources it can be accessed by :
QFile file(":/somePrefix/new.txt");
If you put the file in a folder alongside the source directory and add it to the resources, you can access it by :
QFile file(":/folderName/new.txt");