Windows动态链接库：dll与exe相互调用问题

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

本文回顾学习一下Windows动态链接库：dll与exe相互调用问题。一般滴，exe用来调用dll中的类或函数，但是dll中也可以调用exe中的类或函数，本文做一些尝试总结。

dll程序：

CoolFormat Source Formatter http://blog.csdn.net/akof1314

Calculator.h

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35

// 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_

#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_)

CoolFormat Source Formatter http://blog.csdn.net/akof1314

Calculator.cpp

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

// 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!");
;
}

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

exe程序：

CoolFormat Source Formatter http://blog.csdn.net/akof1314

IHelper.h

1
2
3
4
5
6
7
8
9
10
11

#pragma once
/************************************************************************/
// 抽象类 */
// 该类在exe中,方便dll中调用
/************************************************************************/

class IHelper
{
public:
;
};

CoolFormat Source Formatter http://blog.csdn.net/akof1314

Helper.h

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

// 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_

#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_)

CoolFormat Source Formatter http://blog.csdn.net/akof1314

Helper.cpp

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

// 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 << " ";
}

CoolFormat Source Formatter http://blog.csdn.net/akof1314

main.cpp

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

#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";

// 隐式调用
std::cout << "\n隐式调用" << std::endl;
Calculator cal;
// 回调指针给dll
IHelper *helper = new Helper();
cal.registerHelper(helper);
);
std::cout << "cal.add = " << num_add << std::endl;
);
std::cout << "cal.sub = " << num_sub << std::endl;

// 显式调用
std::cout << "\n显式调用" << std::endl;
HMODULE hDll = ::LoadLibrary("../Debug/vs_dll.dll");
if (hDll != NULL)
{
Cal cal = (Cal)GetProcAddress(hDll, "getCalculator");
Calculator *pCal = cal();
// 回调指针给dll
IHelper *helper = new Helper();
pCal->registerHelper(helper);
);
std::cout << "pCal->add = " << num_add << std::endl;
);
std::cout << "pCal->sub = " << num_sub << std::endl;

}

std::cin.get();
;
}