c++ 调用dl里的导出类

来源：http://blog.csdn.net/yysdsyl/article/details/2626033

动态dll的类导出:CPPDll2->test.h

#pragma  once
//#include "boost/shared_ptr.hpp" 
 class Test { 
public:  
virtual ~Test() {}  
virtual void DoIt() =0; 
};  //
extern "C" _declspec(dllexport)  std::auto_ptr<Test> CreateTest(); //
extern "C" _declspec(dllexport) boost::shared_ptr<Test> CreateTest(); 
extern "C" _declspec(dllexport) Test* CreateTestPtr();  
extern "C" _declspec(dllexport) void DeleteTestPtr(Test*);

动态dll的类导出的实现：CPPDll2->test.cpp

//test.cpp 
#include "stdafx.h" 
#include "Test.h" 
#include <stdio.h> //
#include <memory> //
#include "boost/shared_ptr.hpp"   
class CTest : public Test 
{ 
public:     
virtual void DoIt()    
{ 
      printf("Should do something/n"); 
} 
};  //
std::auto_ptr<Test> CreateTest() //
{ //    
      return std::auto_ptr<Test>(new CTest); //
}   //
boost::shared_ptr<Test> CreateTest() //
{ //   
      return boost::shared_ptr<Test>(new CTest);  //
}  
Test* CreateTestPtr() 
{     
      return new CTest(); 
}  
void DeleteTestPtr(Test* t) 
{    
      if(t !=NULL)     
       {         
           delete t;        
           t =NULL;     
       }  
}

对loadlibrary的分装，可以作为tools：

//library.h 
#pragma once 
#include <windows.h> 
#include <string> 
#include <assert.h>  
class Library 
{ 
public:  
 explicit Library(const wchar_t* name)  
{   
       m_handle = LoadLibrary(name);   
       assert(m_handle);   
       if (!m_handle)    
            throw std::runtime_error(std::string("Could not find library file:"));   
}   
~Library()  
{  
       FreeLibrary(m_handle);  
}   
void* GetProc(const char* name)  
{   
      void* proc = ::GetProcAddress(m_handle, name);   
      assert(proc);   
      return proc;  
}  
private:  
HMODULE m_handle; 
};

client的调用：

 #include "stdafx.h" 
#include "library.h" 
#include "../CppDll2/test.h" 
 int _tmain(int argc, _TCHAR* argv[]) 
{        
      typedef Test* (*CREATE)();     
      typedef void (*DEL)(Test*);        
      Library lib(L"CppDll2.dll");     
      std::auto_ptr<Test> test = ((std::auto_ptr<Test> ) lib.GetProc("CreateTest"));    
      Test* test = (((CREATE)(lib.GetProc("CreateTestPtr")))());     
      test->DoIt();    
      ((DEL)(lib.GetProc("DeleteTestPtr")))(test);     
      return 0; 
}