How to use c language to call a dynamic link library made of c ++ and a dynamic link library

How to use c language to call a dynamic link library made of c ++ and a dynamic link library

How to call the dynamic link library so file made by C ++ in C Language
If you have a dynamic link library made by c ++. so file, and you only have some declaration of related classes, so how do you use c to call it? Don't worry. This article uses a small example to let you deal with it very well.
Link Library header file:
Head. h

Class A {public: A (); virtual ~ A (); int gt (); int pt (); private: int s ;}; // He asked hovertree.com

Firstso. cpp

# Include <iostream> # include "head. h" A: A () {} ::~ A () {} int A: gt () {s = 10;} int A: pt () {std: cout <s <std :: endl;} // He asked hovertree.com

The compilation command is as follows:
G ++-shared-o libmy. so firstso. cpp
At this time, generate the libmy. so file and copy it to the System Library:/Usr/lib/
Perform secondary encapsulation:

Secso. cpp

# Include <iostream> # include "head. h "extern" C "{int f (); int f () {A a;. gt (); a.pt (); return 0 ;}// he asked hovertree.com

Compile command:
Gcc-shared-o sec. so secso. cpp-L.-lmy
At this time, the second. so file is generated. At this time, the Library is changed from a class to a c interface.
Copy/Usr/lib
Call the following:
Test. c

# Include "stdio. h "# include" dlfcn. h "# define SOFILE" sec. so "int (* f) (); int main () {void * dp; dp = dlopen (SOFILE, RTLD_LAZY); f = dlsym (dp," f "); f (); return 0;} // He asked hovertree.com

The compilation command is as follows:
Gcc-rdynamic-s-o myapp test. c

 

Run Z $./myapp

10
$

 

Http://www.cnblogs.com/roucheng/p/3456005.html