How to run a C++ code in Qt?

[Rela]

@jsulm
I definitely need my C++ code, because everything to get the results is in the code, but when I create a new project in Qt, the "main.cpp" file is also created. If I right click on it and "Remove File" do I need add this code somewhere?

I had Qt5.4.1 before, and it gave results in "Application output" previously using “Desktop Qt5.4 MinGW” with the same main functions.

[SGaist]

If you already have a main function that does everything then no. Just keep this in mind: having your main function in a file not named main.cpp is pretty unusual for an application, not forbidden, just unusual. Beware of maintenance nightmare.

[Rela]

@SGaist

I created another project file, and added the C++ files, but instead of adding the code .cpp file I copied it in "main.cpp" file. The only change I made was that copied the

QApplication a(argc, argv);
    MainWindow w;
    w.show();

After
int main(int argc, char *argv[])
{
. So, now there is only one main function in "main.cpp".

After that I added the text file by "Argument", using MinGW 32bit, gives this "Runtime Library" error: MinGW 32bit I read maybe its because MinGW is 32bit and I need to use 64 bit as compiler.
And used "Desktop Qt5.5.1 MSVC 2013 64 bit" , it gives this error: MSVC 64bit

[SGaist]

Run it through the debugger, you're doing something fishy in your code. Throwing a bad alloc means that you are trying to allocated more memory than it's available. It might pass on 64bit (not the same memory limits) but if it does, it means that you are doing something else that is wrong and makes your application crash.

[Rela]

This post is deleted!

[Rela]

@SGaist
When I click on MSVC to debug MSVC and "F5", it gives this error: No engine
When I use MinGW and "F5", it gives this error: MinGW

[SGaist]

You need to install the debugger for MSVC

[Rela]

@SGaist
In "Maintenance Tool.exe" these components were chosen. components Do I need to mark "Windows Runtime" also?
In "Build & Run", there is one debugger, if it should be added manually, from which folder I have to select it? Debugger

[SGaist]

MSVC debugger can only be obtained from Microsoft website, here

[Rela]

@SGaist
Thanks, should I install SDK or WDK?
I did search,but it is said that CDB goes with Visual C++, but there is not download link for CDB.

[Rela]

@SGaist
I installed Windows SDK and chose all components including "debugging tools for windows". Now, in Tools -> Options -> Build & Run -> Debuggers, I see the two paths for CDB. In "Kit" I chose "Desktop Qt5.5.1 MSVC2013 64bit" and from "Debugger" combo, the CDB.
I debug the program with it, and it doesn't give the previous error, but first open the mainwindow.ui and then shows "Debugging starts" in "Application Output" and Compile Output.
As I wrote before, instead of adding the (C++code.cpp) file I copied the code in "main.cpp" file to have one main fucntion. The only change I made was that copied the

QApplication a(argc, argv);
    MainWindow w;
    w.show();

After
int main(int argc, char *argv[])
{
in my C++ code. How can I see the results (which are some numbers) in mainwindow.ui?

[SGaist]

Did you implement anything in MainWindow ?

[Rela]

@Rela
Yes, its an algorithm here written in C++.

[SGaist]

I can't really read it because of all the whited out parts. But the first thing I'd do is check that you don't do anything funky in there. Remove what's not related to your algorithm from main and try to run that. Once it's good, bring back the Qt parts.

[Rela]

@SGaist
Sorry for white space, I have to remove some function names. The algorithm is 2820 lines, and I think each line is needed to output the result. Do you mean i remove the algorithm completely and just remain
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();}

in main.cpp
I did that and the here is the output.

[SGaist]

Looks like there's no error there. But I meant the other way around. Run just your algorithm code. The error is there somewhere. And you should put a break point at the start so you can go step by step until it breaks.

[Rela]

@SGaist
The algorithm code gives result in MSVC2013.

[SGaist]

Then there's something fishy going on with MinGW or you're lucky with Visual Studio. Without any code I can't possibly help you find why it's crashing only with MinGW.

[Rela]

@SGaist
The above output was the debug using "Desktop Qt 5.5.1 MSVC2013 64 bit". I didnt debug with MinGW. The problem is the way I use to get the results in UI.
I tried a simple project to print out "Hello world", the C++ code written in MSVC gives output. Could you please take a look at my files:
Here are the content of C++ all files.
main.cpp
Bucky9.cpp
stdafx.cpp
targetver.h
stdafx.h
Now I created a Qt widget project, and I added the C++ code stdafx.h, targetver.h, and stdfx.cpp files using "Add existing Files" to the header and source. I didnt add Bucky9.cpp and main.cpp. Instead, I coppied the main.cpp C++ codes in the Qt main.cpp file with a little changes of all files.
(Changes: 1- Bucky9 is not included in Qt.
2- In stdafx.h #include <char.h> instead of <tchar.h>
3- Including #include "stdafx.h" in mainwindow.cpp.

Here are the content of all files in Qt project:
main.cpp
mainwindow.cpp
stdafx.cpp
stdafx.h
targetver.h
mainwindow.h

When I debug it it start debugging and when I click on Run it gives the "Hello world" in "Application output" here
Now I just want to get the "Hello world" in "mainwindow.ui" instead of in "Application output". Could you tell me how to do that?

[SGaist]

First thing: don't use cout since it will send the text to the console.

You can simply put a QLabel with hello world as text as central widget of your MainWindow class.