How to run a C++ code in Qt?

[kshegunov]

@Rela

Add the aforementioned headers to the mainwindow.h:

#include <iostream>
#include <fstream>
#include <ostream>

using namespace std;

Otherwise the compiler will not know what ostream is.

[Rela]

@kshegunov
Done, but here are the errors cleaned again ;)

[kshegunov]

@Rela
I'm sorry but I have no idea what's happening, with the deletions and without a complete code snippet this is just turning into a guessing game. Not to mention the preprocessor directives, whose expansions I have no way of deducing. The errors have obviously changed and they are at compile-time, so focus on that and try to resolve the type mismatches.

[Rela]

@kshegunov
The problem is not related to the code. The C++ code works properly in MV and also it worked in Qt creator before and gave the results in "Application Outputs" with Qt5.5 and MV 2013. The problem happened, when I start working with MV 2015 and Qt5.6 beta.
I just did the previous way and added all C++ files to the Qt project files. Do you have any idea about the ```

error: dependent '..\C++' does not exist.

[kshegunov]

@Rela
I have never seen that error, but if I had to guess probably a folder can't be found by qmake. Inspect your project file, and make sure all folders/files exist. Then rerun qmake and then do a full rebuild. Additionally, don't use backslashes for your paths when working with qmake, use *nix-style paths, for example: C:/somefolder/somefile.cpp

[SGaist]

Do you have something containing "C++" anywhere in your .pro file ?

[Rela]

@SGaist
Yes, I had something like this in PS8, because I added the C++ project header and source files through the "../C++ projects/po... /" path. But, now I removed the space of "C++ projects" (because maybe it makes problem), and changed the path withoutspace. PS10 Qt project .pro file is this
Now the error is this

[jsulm]

What is char.h?

[Rela]

@jsulm
It was

#include <tchar.h>

in the C++ code, but it had given the errors like

'void PS... (char *)': cannot convert argument 1 from 'const char [37]' to 'char *'

and I changed it to "char".
I think its related to the main function in "main.cpp"

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

[jsulm]

How is it related to main?
char is a native data type in C and C++, you do not have to include any header file to use it. So just remove this include.
This error:

'void PS... (char *)': cannot convert argument 1 from 'const char [37]' to 'char *'

You got probably because you're passing a const char string as parameter to a function which expects a non const char string:

void PS... (char *param);
then you call
PS...("a string");

Do it like this:

char *param = "a string";
PS...(param);

[kshegunov]

@Rela

'void PS... (char *)': cannot convert argument 1 from 'const char [37]' to 'char *'

The error is because you're passing const char * const to a function expecting char * and the compiler doesn't know how to (safely) convert the argument. My advice is: rework your function to accept non-mutable arguments if possible, if not - fix the type mismatch. @jsulm already pointed out that you shouldn't include headers you're not going to need, unless massive compilation times is something you're after.

Kind regards.

[Rela]

Hi, the previous error was solved. I wanted to have a C++ code results in widget. For reminding in brief, I created a Qt widget project, and I added the C++ code including header and source files to the project. I copied the main.cpp C++ codes in the Qt main.cpp file.

The error was ```

void PS... (char *)': cannot convert argument 1 from 'const char [37]' to 'char *

I changed the definition of the function:

void PS... (char *_sth)

to

void PS... (const char *_sth) 

and it doesn't give the error. But, now I want to have some values as result in Application Output , but instead of the non-zero values, they are all zero.
The input data are read from a model.txt file. The path of the text file was also added in the "project" > run of "Desktop Qt 5.6 MSVC2015 64 bit" > "Arguments". Do you know if it is related to the reading input data or not?

[jsulm]

How do you read model.txt file?
Is this file found?
Do you have any errors while reading it?
Why don't just debug and see what happens?

[Rela]

@jsulm
In the code, it read using ```

bool ReadModelData(istream &in, functionname &_PS) ...
...
ReadModelData (fin,s)
...

The path of the text file was added in the "project" > run of "Desktop Qt 5.6 MSVC2015 64 bit" > "Arguments". File path
When I debug it just show in the Application output:

Debugging starts
Debugging has finished

and when run the code the results are cpu=0 z=0 ... while they should be some non-zero.