vs2010 中创建扩展dll

新建一个MFC 扩展DLL 加一个类在工程

但在类的开头要加上class AFX_EXT_CLASS  CComputer : public CObject（基类）

头文件

#pragma once

// CComputer command target

class AFX_EXT_CLASS  CComputer : public CObject

{

public:

                CComputer();

                 virtual ~CComputer();

                 void ComputerSet(double data1,double data2);

public:

                 double m_data1;

                 double m_data2;

public:

                 double Add();

                 double Substract();

                 double Devide();

                 double Multiple();

};

  

实现文件

#include "stdafx.h"

#include "Computer.h"

// CComputer

CComputer::CComputer()

{

                m_data1 = 0;

                m_data2 = 0;

}

CComputer::~CComputer()

{

}

void CComputer::ComputerSet(double data1,double data2)

{

                m_data1 = data1;

                m_data2 = data2;

}

double CComputer::Add()

{

                 return m_data1 + m_data2;

}

double CComputer::Substract()

{

                 return m_data1 - m_data2;

}

double CComputer::Multiple()

{

                 return m_data1 * m_data2;

}

double CComputer::Devide()

{

                 if(m_data2 != 0)

                 return (double ) m_data1 / (double) m_data2;

                 else

                {

                                AfxMessageBox(_T( "分??母?不?能??为a零??" ));

                                 return 1;

                }

}

编译后产生 在Debug目录下产生 ExtensionDll.ilb和ExtensionDll.dll

然后创建测试dll的工程ExtensionTest是基于对话框的

添加控件一览

控件名称	控件ID	变量名
	IDC_DATA1	m_data1
	IDC_DATA2	m_data2
	IDC_RESULT	m_result
加	IDC_ADD	OnComputer(UINT nID)
减	IDC_SUBSTRACT
乘	IDC_MULTIPLE
除	IDC_DEVIDE

在ExtensionTeseDlg.h文件中添加

#include "Computer.h"

在类的内部添加

afx_msg void OnComputer(UINT nID);

public：

 double m_data1;

 double m_data2;

  double m_result;

  CComputer * m_pComputer;

  afx_msg void OnBnClickedCancel();

实现文件中 初始化参数

CExtensionTestDlg::CExtensionTestDlg(CWnd* pParent /*=NULL*/)

                : CDialogEx(CExtensionTestDlg::IDD, pParent)

{

                m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

                m_pComputer = new CComputer();

                m_data1 = 0.0;

                m_data2 = 0.0;

                m_result = 0.0;

}

    

在消息处理函数中添加

BEGIN_MESSAGE_MAP(CExtensionTestDlg, CDialogEx)

                ON_COMMAND_RANGE(IDC_ADD,IDC_DEVIDE,OnComputer)

END_MESSAGE_MAP()

剩余的函数

void CExtensionTestDlg::OnComputer(UINT nID)

{

                UpdateData();

                m_pComputer -> ComputerSet(m_data1,m_data2);

                 switch(nID)           

                {

                 case IDC_ADD:

                                m_result = m_pComputer ->Add();

                                 break;

                 case IDC_SUBSTRACT:

                                m_result = m_pComputer ->Substract();

                                 break;

                 case IDC_MULTIPLE:

                                m_result = m_pComputer ->Multiple();

                                 break;

                 case IDC_DEVIDE:

                                m_result = m_pComputer ->Devide();

                                 break;

                }

                UpdateData( false);

                 if(nID == IDC_DEVIDE && m_data2 == 0)

                {

                                CEdit *pEdit =( CEdit* ) GetDlgItem(IDC_DEVIDE);

                                pEdit ->SetFocus();

                }

}

void CExtensionTestDlg::OnBnClickedCancel()

{

                 if(m_pComputer)

                {

                                 delete m_pComputer;

                                m_pComputer = NULL;

                }

                 // TODO: Add your control notification handler code here

                CDialogEx::OnCancel();

}

  最后将ExtensionDll.dll文件和ExtensionDll.lib拷贝在当前目录下

再在project->property->linker->input下添加依赖关系

  最后编译 运行