Libraries

[Rakanoth]

This question is bothered me alot. how i can use libraries in visual c++ 2012
i got alglib library http://www.alglib.net/ for example please i need an explanation step by step how i can put this functions into use
thanx alot

[Rakanoth]

??

[kevinkjt2000]

Just put all the includes and cpp files that are part of alglib in the same folder as the rest of your code. You might could put them in a folder of their own, but I did not try that. The example below is what I did with just copying ap.h, ap.cpp, and stdafx.h into the same directory as main.cpp. Then I just compiled them as seperate object files and linked the two together.

//main.cpp
#include <iostream>
#include "ap.h"

int main(int argc, char **argv)
{
    std::cout << "alglib::randomreal() - returns random real number from [0,1)"
              << std::endl << alglib::randomreal() << std::endl;
    return 0;   
}

[Rakanoth]

#include "stdafx.h"
#include "ap.h"
#include <iostream>


int _tmain(int argc, _TCHAR* argv[])
{
	std::cout << alglib::randomreal();
	return 0;
}

Error 1 error LNK2019: unresolved external symbol "double __cdecl alglib::randomreal(void)" (?randomreal@alglib@@YANXZ) referenced in function _wmain

Error 2 error LNK1120: 1 unresolved externals

[kevinkjt2000]

You need to link ap.cpp and main.cpp together

I did a simple compile and link like this:

> g++ -c ap.cpp
> g++ -c main.cpp
> g++ ap.o main.o

And on my system g++ makes a.exe by default if no -o switch is given, so I ran the code by doing this:

> a.exe

[z05DSL3A]

you need to tell Visual studio where to find the library files.

It's midnight here and I'm off but this may help:

http://msdn.microsoft.com/en-us/library/vstudio/ee855621.aspx