Qt/Qt Creator - The program has unexpectedly finished. <program's path> crashed

Question

I'm somewhat new to C++ and to Qt 5.2.1. I'm actually learning how to use Qt. To do it as easy as possible, I'm using Qt Creator 3.0.1.

I've written this little piece of code in the main.cpp file of my project :

#include <QApplication>
#include <QPushButton>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QPushButton bouton("Hello !");
    bouton.show();

    return app.exec();

}

And the .pro file (by default) :

SOURCES += \
    main.cpp

I tried to make it run, then I got the issue "QApplication : no such file or directory".

Then, I added "QT += widgets" to the .pro file (full file) :

SOURCES += \
    main.cpp
QT += widgets

And now I get :

Starting <path to .exe>... 
The program has unexpectedly finished.
<path to .exe> crashed

Please, tell me how to make it work. Thanks for reading and for your help.

(OS : Windows 7, Debug : Desktop Qt 5.2.1 MinGW 32bit)

Compile Output :

16:06:54: Running steps for project test...
16:06:54: Configuration unchanged, skipping qmake step.
16:06:54: Starting: "C:\Qt\Tools\mingw48_32\bin\mingw32-make.exe" 
C:/Qt/Tools/mingw48_32/bin/mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory 'C:/Users/PLD/Documents/PLD/Projets Codages/Qt/Qt/build-test-Desktop_Qt_5_2_1_MinGW_32bit-Debug'
mingw32-make[1]: Nothing to be done for 'first'.
mingw32-make[1]: Leaving directory 'C:/Users/PLD/Documents/PLD/Projets Codages/Qt/Qt/build-test-Desktop_Qt_5_2_1_MinGW_32bit-Debug'
16:06:55: The process "C:\Qt\Tools\mingw48_32\bin\mingw32-make.exe" exited normally.
16:06:55: Elapsed time: 00:01.

Application Output :

Starting C:\Users\PLD\Documents\PLD\Projets Codages\Qt\Qt\build-test-Desktop_Qt_5_2_1_MinGW_32bit-Debug\debug\test.exe...
The program has unexpectedly finished.
C:\Users\PLD\Documents\PLD\Projets Codages\Qt\Qt\build-test-Desktop_Qt_5_2_1_MinGW_32bit-Debug\debug\test.exe crashed

Yeah program works fine on working configuration, do Qt examples work for you? Maybe you could also run debug and see what call stack it shows on crash. — Predelnik
@Predelnik Same issue for the examples : "The program has unexpectedly finished". — PLD
well I can suggest to try to compile your program in debug and see where exactly it crashes, it at least may give some hints. — Predelnik
Woah, you better not post it in comments like that but use pastebin.com or something like this. And actually your compiling and application logs are not very interesting what I meant is to use some kind of IDE or gdb to see call stack of the place where your program is crashed exactly. — Predelnik
I would say do the following from scratch - New file or project - choose - QT Widget Application - under Applications. Give a name. Do next and finally the code will be ready. Now, in the main.cpp overwrite with you stuff. it should work if there is no env issue. — dexterous

Aguest Aguest · Accepted Answer · 2014-02-08T14:25:29

The code looks good. One explanation for what you get would be incompatible DLLs (e.g. Debug vs Release builds, or MSVC vs MinGW). You could start depends.exe with your .exe and check whether it picks up libraries from unexpected locations.

Qt/Qt Creator - The program has unexpectedly finished. <program's path> crashed

2 Answers