现在需要使用共享对象实现通过配置文件生成类对象的功能 ， 写了一些代码大家看一下

======================getstr.h=============================

#ifndef __GET_STR_H__
#define __GET_STR_H__


class Obj
{
 public:
  int b;
  char *a;
  Obj();
  int c();
}; 

#ifdef SHARED
typedef bool (*GetStr)(char* str,int len);
typedef Obj* (*GetObj)();
#else
extern "C"
{
bool GetStr(char* str,int len);
Obj* GetObj();
}
#endif

#endif

==========================================================

========================getstr.cpp=================================

#include"string.h"
#include"getstr.h"
#include"stdio.h"

Obj::Obj()
{
  a = new char[100];
  b = 100;
  printf("indl");
}

int Obj::c()
{
  a[0] = '!';
  a[1] = 0;
 return 20;
}

extern "C" 
{

  bool GetStr(char* str,int len)
  {
    if(len < 10)
      return false;
    else
      strcpy(str,"1234567890");
  
    return true;
  }

  Obj* GetObj()
  {
    return new Obj();
  }
}

bool ReadStr(char* str,int len)
{
    if(len < 10)
        return false;
      else
        strcpy(str,"1234567890");
  
      return true;
}

=============================================================================
================================dy.cpp============================================

#include"stdio.h"

#include"dlfcn.h" /*share object interface file*/

#define SOFILE "/home/jameschen/Documents/ShareObject/libMyShareObject.so.1.0"

#define SHARED
#include"getstr.h"


int main()
{

  void *dp;
  char *error;

  GetStr getstr;
  GetObj getobj;

  puts("share object test");
  
  dp = dlopen(SOFILE,RTLD_LAZY);
  
  if(dp==NULL)
    {
      printf("\nerror: %s\n",dlerror());
      return -1;
    }

  getstr = (GetStr)dlsym(dp,"GetStr");
  getobj = (GetObj)dlsym(dp,"GetObj");

  error = dlerror();

  if(error)
    {
      printf("\nerror: %s\n",error);
      return -1;
    }
  
  char test[11] = {0};
  
  getstr(test,10);
  Obj *obj =  getobj();
  printf("obj.a is %s\n",obj->a);
  printf("obj.b is %d\n",obj->b);
  
  obj->c();     [color=#FF0000]这里报错了[/color]
  
  printf("obj.a is %s\n",obj->a);
  printf("obj.b is %d\n",obj->b);

  printf("current string: %s \n",test);

  dlclose(dp);

  return 0;
}