Poco::DynamicFactory Demo 【转】

原文：http://blog.csdn.net/huang_xw/article/details/8174586

DynamicFactory.cc

#include <iostream>
#include <cstdlib>
#include <assert.h>
#include <Poco/DynamicFactory.h>

namespace DF
{
   class Base
   {
   public:
      Base()
      {
      }

      virtual ~Base()
      {
      }
   };

   class A: public Base
   {
   public:
      void print(){std::cout << "My name is A Class!" << std::endl;}
   };

   class B: public Base
   {
   };
}

void test_DynamicFactory()
{
   // 创建一个工厂实例.
   Poco::DynamicFactory<DF::Base> dynFactory;
   // 类A注册到工厂, 注册名为A, 当然也可以为其他的名字.
   dynFactory.registerClass<DF::A>("A");
   dynFactory.registerClass<DF::B>("B");
   assert (dynFactory.isClass("A"));
   assert (dynFactory.isClass("B"));

   // 通过工厂, 创建类A的对象.
   DF::A* a = dynamic_cast<DF::A*>(dynFactory.createInstance("A"));
   std::auto_ptr<DF::A> ap(dynamic_cast<DF::A*>(dynFactory.createInstance("A")));

   a->print();
   ap->print();
   try
   {
      // 已经注册过了, 将抛出异常.
      dynFactory.registerClass<DF::A>("A");
   }
   catch (...)
   {
      std::cout << "exception" << std::endl;
   }

   try
   {
      // 反注册类B的
      dynFactory.unregisterClass("B");
      // 未注册的类, 注册时将抛出异常.
      std::auto_ptr<DF::B> b(dynamic_cast<DF::B*>(dynFactory.createInstance("B")));
   }
   catch (Poco::NotFoundException&)
   {
      std::cout << "exception" << std::endl;
   }
}

   int
main ( int argc, char *argv[] )
{
   test_DynamicFactory();
   return EXIT_SUCCESS;
}           /* ----------  end of function main  ---------- */

结果：

[root@slayer ptn]# g++ DynamicFactory.cc -lPocoFoundation -o df
[root@slayer ptn]# ./df
My name is A Class!
My name is A Class!
exception
exception