passing an argument into a C++ shared library

Question

I want to pass an argument into a C++ shared library lib.so form loader.exe.

Sorry, update the question.

shared library like:

int count(){
         int num = 9;
         int result = 0;
         for ( int i = 0; i < num; i++ ){
                 result ++;
         }
         return result;
}

In the loader.exe, use a dlopen to load it.

void *handler = dlopen("lib.so", RTLD_LAZY);

I want to change the value of num from loader.exe. when I call the function count(), it can give me the new result.

How should I do?

thanks!

This question is insane. It doesn't even make sense if there weren't any shared libraries involved. — Kerrek SB, Jun 27 '13 at 13:21
@user2413399: I have updated my answer. Please check it out. — keelar, Jun 27 '13 at 13:57
And yes, as Kerrek said, this question is in fact shared-library irrevalent. — keelar, Jun 27 '13 at 13:59

score 0 · Answer 1 · answered Jul 30 '14 at 08:48

0

You can define a global variable num (set to the desired value) in your loader program and change

     int num = 9;

to

     extern int num;

.

answered Jul 30 '14 at 08:48

Armali

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passing an argument into a C++ shared library

1 Answers1