The generation and use of dynamic link library in Linux environment

Using your own package so encountered a problem, in the light of the principle of the decision to write a demo to see, by the way record the whole process.

1) The files required to generate so are as follows:

Print.h

#ifndef __print_h__#define __print_h__void print (void); #endif

Print.cpp

#include <stdio.h> #include "print.h" void print (void) {printf ("Hello world.\n");}

Bye.h

#ifndef __bye_h__#define __bye_h__void bye (void); #endif

Bye.cpp

#include <stdio.h> #include "bye.h" void Bye (void) {printf ("Bye bye.\n");}

Midd.h

#ifndef __midd_h__#define __midd_h__class middleware{public:middleware (); ~middleware (); BOOL Data (const char *p);}; #endif

Midd.cpp

#include "print.h" #include "bye.h" #include "midd.h" #include <stdio.h>middleware::middleware () {printf (" Middleware::middleware () \ n ");} Middleware::~middleware () {printf ("middleware::~middleware () \ n");} BOOL Middleware::d ATA (const char *p) {print (); bye (); return true;}

　　

2) Compilation process

g++-c-fpic-shared Bye.cpp

g++-c-fpic-shared Print.cpp

g++-c-fpic-shared Midd.cpp

3) Linking process

g++-o test.so midd.o print.o bye.o-fpic-shared

4) Use of dynamic link libraries

Now write a main.cpp to call so and see the effect

Main.cpp

#include "midd.h" int main () {middleware middleware;middleware.data ("xxx"); return 0;}

To generate an executable file:

g++-O test main.cpp/test.so

Test:

./test

Middleware::middleware () Hello World.bye bye. Middleware::~middleware ()

　　

The generation and use of dynamic link library in Linux environment