Calling external functions from QT

ArchGabe

Hi guys,

I developed a whole new library to do some calculations on Eclipse. Now I need to call these functions inside Qt. I added the path to PATH variable at .pro file, but when I try to compile, I get "no such file or directory" error. Any idea on how to solve this?

SergioDanielG

Hi ArchGabe.
Did you add LIBS += "/path/to/lib" to .pro file?
Regards.

ArchGabe

Yes, I did...

ArchGabe

test.hpp: no such file or directory

SergioDanielG

Well, to do this, I'm doing..

Add LIBS += to .pro file.
Add .h of library to my project.
Copy library to app folder.

Hope it's util.

Regards.

ArchGabe

Actually, there is no .lib file. All I want is to import the header file, which has all the functions definitions...

francescmm

You should use:

INCLUDEPAT += path/to/include

In the .pro file.

ArchGabe

Now I am getting multiple definition error...

francescmm

You should include all the includes necessaries. More information would be confortable...

ArchGabe

I did...
.
On Eclipse, I created a .hpp file like this:

@
#ifndef FUNCTION__HPP__
#define FUNCTION__HPP__

int foo() {return 2;}

#endif
@

Then, I added the following path to my QT project .pro file:

@
INCLUDEPATH += /path_to_hpp_file
@

My mainwindow.h

@
#include "function.hpp"
@

and on my mainwindow.cpp also (wich doensn't change anything):

@
#include "function.hpp"
@

Now I am getting "multiple definition" error... And I don't know why...

francescmm

It's the method already defined in other part of your code?

ArchGabe

No...