Pure C++ build with QtCreator

Question

At the moment I am using QtCreator 2.8.1 based on Qt 5.1.1 under Ubuntu Linux. I do both, Qt Development and coding pure C++ projects. Because I don't want to install a second heavyweight IDE like Eclipse for latter I'd like to use QtCreator for that.

Up to now I created a new C++ Project (without Qt) by clicking on File->New->C/C++ Project (without Qt)->C++-Project . So now coding works fine. But with my first build I discovered a huge problem with my main.cpp

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main() {
    ifstream infile("file1.in");
    string line;

    while(infile >> line) {
        cout << line << endl;
    }

    cout << "hello world" << endl;

return 0;
}

When I run this within QtCreator I see only "hello world" on the console, but nothing more (file1.in contains more than 20 lines of raw text). Now the strange thing. After compiling this with a little g++ main.cpp I see all my 20 lines of text and "hello world".

Does anybody have a clue why this happens? I thought I have to change the compiler in QtCreator, but this attempt wasn't successfully.

Answer 1

QtCreator by default use shadow builds, it means you executable will be build in separated folder. In your code you use relativ path to the file:

ifstream infile("file1.in");

simply change it fullpath or make sure your file1.in exist in the shadow build folder for your project.

ifstream infile("C:\\file1.in");