Windows動態連接庫：dll與exe相互調用問題

時間 2019-11-06

標籤 windows 動態連接 dll exe 相互調用問題欄目 Windows 简体版

原文原文鏈接

本文回顧學習一下Windows動態連接庫：dll與exe相互調用問題。通常滴，exe用來調用dll中的類或函數，可是dll中也能夠調用exe中的類或函數，本文作一些嘗試總結。ios

dll程序：函數

 
  Calculator.h  
 

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// Calculator.h: interface for the Calculator class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_ALCULATOR_H__D072BBB5_615B_45A9_9864_80C2291FA695__INCLUDED_)
#define AFX_ALCULATOR_H__D072BBB5_615B_45A9_9864_80C2291FA695__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class IHelper;
class Helper;
class _declspec(dllexport) Calculator
{
public :
    Calculator();
    ~Calculator();

     void registerHelper(IHelper *iHelper);
     void registerHelper(Helper  *helper);

     int add( int num1, int num2);
     int sub( int num1, int num2);

private :
    IHelper     *m_iHelper;
    Helper      *m_helper;

};

extern "C" _declspec(dllexport) Calculator *getCalculator();

#endif // !defined(AFX_ALCULATOR_H__D072BBB5_615B_45A9_9864_80C2291FA695__INCLUDED_)

    Calculator.cpp  
 

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// Calculator.cpp: implementation of the Calculator class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Calculator.h"
#include "../vs_dll_caller/Helper.h"

#include "../vs_dll_caller/Helper.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

Calculator::Calculator()
{

}

Calculator::~Calculator()
{

}

void Calculator::registerHelper(IHelper *iHelper)
{
    m_iHelper = iHelper;
}

void Calculator::registerHelper(Helper *helper)
{
    m_helper = helper;
}

int Calculator::add( int num1, int num2)
{
    m_iHelper->print( "do add!" );
     return num1 + num2;
}

int Calculator::sub( int num1, int num2)
{
    m_iHelper->print( "do sub!" );
     return num1 >= num2 ? num1 - num2 : - 1 ;
}

Calculator *getCalculator()
{
     return new Calculator();
}

exe程序：學習

    IHelper.h 
 

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#pragma once
/************************************************************************/
// 抽象類 */
// 該類在exe中,方便dll中調用
/************************************************************************/

class IHelper
{
public :
virtual void print( const char *str) = 0 ;
};

    Helper.h 
 

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// Helper.h: interface for the Helper class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_HELPER_H__9234DC8C_56CC_4765_BDA6_276F30C52221__INCLUDED_)
#define AFX_HELPER_H__9234DC8C_56CC_4765_BDA6_276F30C52221__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "iHelper.h"

class Helper
    : public IHelper
{
public :
    Helper();
     virtual ~Helper();

     virtual void print( const char *str);

};

#endif // !defined(AFX_HELPER_H__9234DC8C_56CC_4765_BDA6_276F30C52221__INCLUDED_)

    Helper.cpp 
 

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// Helper.cpp: implementation of the Helper class.
//
//////////////////////////////////////////////////////////////////////

#include "Helper.h"
#include <iostream>

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

Helper::Helper()
{

}

Helper::~Helper()
{

}

void Helper::print( const char *str)
{
std::cout << str << " " ;
}

    main.cpp 
 

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#include <Windows.h>
#include <tchar.h>
#include <iostream>
#include "Helper.h"
#include "../vs_dll/Calculator.h"

typedef Calculator*(*Cal)();

int main()
{
    std::cout << "Hello World!\n" ;

     // 隱式調用
    std::cout << "\n隱式調用" << std::endl;
    Calculator cal;
     // 回調指針給dll
    IHelper *helper = new Helper();
    cal.registerHelper(helper);
     int num_add = cal.add( 3 , 2 );
    std::cout << "cal.add = " << num_add << std::endl;
     int num_sub = cal.sub( 3 , 2 );
    std::cout << "cal.sub = " << num_sub << std::endl;

     // 顯式調用
    std::cout << "\n顯式調用" << std::endl;
    HMODULE hDll = ::LoadLibrary( "../Debug/vs_dll.dll" );
     if (hDll != NULL )
    {
        Cal cal = (Cal)GetProcAddress(hDll, "getCalculator" );
        Calculator *pCal = cal();
         // 回調指針給dll
        IHelper *helper = new Helper();
        pCal->registerHelper(helper);
         int num_add = pCal->add( 3 , 2 );
        std::cout << "pCal->add = " << num_add << std::endl;
         int num_sub = pCal->sub( 3 , 2 );
        std::cout << "pCal->sub = " << num_sub << std::endl;

    }

    std::cin.get();
     return 0 ;
}