1.環境 

ubuntu 14.04 

g++ 4.8.4

2.有類的情況

1）庫檔案

a)原始碼

//cppl2.h

class cal {
public:
	cal();
	virtual ~cal();
	virtual int add(int a, int b);
};

typedef cal* (*creat_t)();
typedef void (*destroy_t)(cal*);

//cppl2.cpp
#include "cppl2.h"

cal::cal(){};
cal::~cal(){}
int cal::add(int a, int b) {
	return a + b;
}

//typedef cal* create_c();
//typedef void destroy_c(cal*);

extern "C" cal* create(){
	return new cal;
}

extern "C" void destroy(cal* c) {
	delete c;
}
 

cd到cppcppl2.cpp所在目錄，輸入命令

g++ -fPIC -shared -o libcppl2.so cppl2.cpp

a）原始碼

//cppcppl2.cpp
#include <stdio.h>
#include <dlfcn.h>
#include "cppl2.h"

using namespace std;
int main() {
	void* handle;
	handle = dlopen("./libcppl2.so", RTLD_LAZY);

	creat_t createcal = (creat_t)dlsym(handle, "create");
	destroy_t destroycal = (destroy_t)dlsym(handle, "destroy");

	cal* _cal = createcal();
	int result = _cal->add(3, 4);
	printf("%d\n", result);
	destroycal(_cal);
	dlclose(handle);
	return 0;
}
 

cd到cppcppl2.cpp所在目錄，輸入命令

g++ cppcppl2.cpp -o cppcppl2 -ldl

3)執行

cd到可執行檔案cppcppl1所在目錄

輸入命令

./cppcppl2