c++ 调用dl里的导出类

来源：http://blog.****.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() =;
};  //
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 ;
}