如何在linux下调用.so库里面的类成员函数？

[muping2011]

//aa.h

class A //A类
{
char* B(char*b); //B成员函数
void C(char*c); //C成员函数

}

//aa.cpp
#include"aa.h"

char* A::B(char*b)
{
printf("b\n");
}

void A::C(char *c)
{
printf("c\n");
}


生成.so文件

g++ aa.cpp -fPIC -shared -o aa.so

怎么在main.cpp中调用aa.so中的B和Ｃ函数？
//main.cpp

#include <stdio.h>
#include <dlfcn.h>
main()
{
//如何才能调用B和C函数？
}

[muping2011]

求代码 求代码 求代码

[qq120848369]

[User:root Time:16:46:48 Path:/home/liangdong/cpp]$ ll
total 12
-rw-r--r--. 1 root      root   120 May  4 16:46 libtest.cpp
-rw-r--r--. 1 root      root    85 May  4 16:45 libtest.h
-rw-r--r--. 1 liangdong daemon 141 May  4 16:42 main.cpp
[User:root Time:16:46:48 Path:/home/liangdong/cpp]$ cat libtest.cpp libtest.h main.cpp 
#include "libtest.h"
#include <iostream>
using namespace std;

void test::function() {
        cout<<"test::function"<<endl;
}
#ifndef _H_TEST
#define _H_TEST

class test {
        public:
                void function();
};

#endif
#include <iostream>
#include "libtest.h"
using namespace std;

int main(int argc, char* const argv[]) {
        test t;
        t.function();
        return 0;
}
[User:root Time:16:46:55 Path:/home/liangdong/cpp]$ g++ -o libtest.so -fPIC -shared libtest.cpp -I.
[User:root Time:16:47:29 Path:/home/liangdong/cpp]$ g++ -o main main.cpp -L. -ltest
[User:root Time:16:47:48 Path:/home/liangdong/cpp]$ ll
total 28
-rw-r--r--. 1 root      root    120 May  4 16:46 libtest.cpp
-rw-r--r--. 1 root      root     85 May  4 16:45 libtest.h
-rwxr-xr-x. 1 root      root   5773 May  4 16:47 libtest.so
-rwxr-xr-x. 1 root      root   5876 May  4 16:47 main
-rw-r--r--. 1 liangdong daemon  141 May  4 16:42 main.cpp
[User:root Time:16:47:50 Path:/home/liangdong/cpp]$ ./main
./main: error while loading shared libraries: libtest.so: cannot open shared object file: No such file or directory
[User:root Time:16:47:51 Path:/home/liangdong/cpp]$ export LD_LIBRARY_PATH=.
[User:root Time:16:48:01 Path:/home/liangdong/cpp]$ ./main
test::function
[User:root Time:16:48:04 Path:/home/liangdong/cpp]$ 

[muping2011]

[User:root Time:16:47:29 Path:/home/liangdong/cpp]$ g++ -o main main.cpp -L. -ltest

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请问这里的这个-L -ltest参数是什么意思？