求mfc代码解释和原理讲解，急急急

求大神指点以下代码解释，和设计原理（部分代码如下），给我说说各功能是怎么实现的
// CalculatorDlg.cpp : implementation file
#include "stdafx.h"
#include "Calculator.h"
#include "CalculatorDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
CAboutDlg();

// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA

// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL
// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCalculatorDlg dialog

CCalculatorDlg::CCalculatorDlg(CWnd* pParent /*=NULL*/)
: CDialog(CCalculatorDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CCalculatorDlg)
m_strEdit = _T("");
m_strRes = _T("");
m_strM = _T("");
m_strHistory = _T("");
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CCalculatorDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CCalculatorDlg)
DDX_Control(pDX, IDC_COMBO_Cns, m_combo_cns);
DDX_Control(pDX, IDC_RADIO_RADIAN, m_radio_radian);
DDX_Control(pDX, IDC_RADIO_DEGREE, m_radio_degree);
DDX_Text(pDX, IDC_EDIT_INPUT, m_strEdit);
DDX_Text(pDX, IDC_EDIT_RESULT, m_strRes);
DDX_Text(pDX, IDC_EDIT_M, m_strM);
DDX_Text(pDX, IDC_EDIT_HISTORY, m_strHistory);
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CCalculatorDlg, CDialog)
//{{AFX_MSG_MAP(CCalculatorDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_About, OnAbout)
ON_BN_CLICKED(IDC_Btn0, OnBtn0)
ON_EN_CHANGE(IDC_EDIT_INPUT, OnChangeEditInput)
ON_BN_CLICKED(IDC_Btn1, OnBtn1)
ON_BN_CLICKED(IDC_Btn2, OnBtn2)
ON_BN_CLICKED(IDC_Btn3, OnBtn3)
ON_BN_CLICKED(IDC_Btn4, OnBtn4)
ON_BN_CLICKED(IDC_Btn5, OnBtn5)
ON_BN_CLICKED(IDC_Btn6, OnBtn6)
ON_BN_CLICKED(IDC_Btn7, OnBtn7)
ON_BN_CLICKED(IDC_Btn8, OnBtn8)
ON_BN_CLICKED(IDC_Btn9, OnBtn9)
ON_BN_CLICKED(IDC_BtnDot, OnBtnDot)
ON_BN_CLICKED(IDC_BtnNgt, OnBtnNgt)
ON_BN_CLICKED(IDC_BtnF, OnBtnF)
ON_BN_CLICKED(IDC_BtnA, OnBtnA)
ON_BN_CLICKED(IDC_BtnB, OnBtnB)
ON_BN_CLICKED(IDC_BtnC, OnBtnC)
ON_BN_CLICKED(IDC_BtnD, OnBtnD)
ON_BN_CLICKED(IDC_BtnE, OnBtnE)
ON_BN_CLICKED(IDC_BtnAdd, OnBtnAdd)
ON_BN_CLICKED(IDC_BtnMin, OnBtnMin)
ON_BN_CLICKED(IDC_BtnMul, OnBtnMul)
ON_BN_CLICKED(IDC_BtnDiv, OnBtnDiv)
ON_BN_CLICKED(IDC_BtnLbar, OnBtnLbar)
ON_BN_CLICKED(IDC_BtnRbar, OnBtnRbar)
ON_BN_CLICKED(IDC_BtnBack, OnBtnBack)
ON_BN_CLICKED(IDC_BtnPow, OnBtnPow)
ON_BN_CLICKED(IDC_BtnMod, OnBtnMod)
ON_BN_CLICKED(IDC_BtnPi, OnBtnPi)
ON_BN_CLICKED(IDC_BtnEe, OnBtnEe)
ON_BN_CLICKED(IDC_Btn10exp, OnBtn10Exp)
ON_BN_CLICKED(IDC_BtnSin, OnBtnSin)
ON_BN_CLICKED(IDC_BtnCos, OnBtnCos)
ON_BN_CLICKED(IDC_BtnTan, OnBtnTan)
ON_BN_CLICKED(IDC_BtnArccos, OnBtnArccos)
ON_BN_CLICKED(IDC_BtnCot, OnBtnCot)
ON_BN_CLICKED(IDC_Arcsin, OnArcsin)
ON_BN_CLICKED(IDC_BtnArctan, OnBtnArctan)
ON_BN_CLICKED(IDC_BtnLog, OnBtnLog)
ON_BN_CLICKED(IDC_BtnSh, OnBtnSh)
ON_BN_CLICKED(IDC_BtnCh, OnBtnCh)
ON_BN_CLICKED(IDC_BtnTh, OnBtnTh)
ON_BN_CLICKED(IDC_BtnLn, OnBtnLn)
ON_BN_CLICKED(IDC_BtnExp, OnBtnExp)
ON_BN_CLICKED(IDC_BtnSqr, OnBtnSqr)
ON_BN_CLICKED(IDC_Abs, OnAbs)
ON_BN_CLICKED(IDC_BtnClean, OnBtnClean)
ON_CBN_SELCHANGE(IDC_COMBO_Cns, OnSelchangeCOMBOCns)
ON_BN_CLICKED(IDC_RADIO_Bin, OnRADIOBin)
ON_BN_CLICKED(IDC_RADIO_Oct, OnRADIOOct)
ON_BN_CLICKED(IDC_RADIO_Hex, OnRADIOHex)
ON_BN_CLICKED(IDC_BtnMS, OnBtnMS)
ON_BN_CLICKED(IDC_BtnMR, OnBtnMR)
ON_BN_CLICKED(IDC_BtnMC, OnBtnMC)
ON_BN_CLICKED(IDC_BtnMadd, OnBtnMadd)
ON_BN_CLICKED(IDC_RADIO_Dec, OnRADIODec)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CCalculatorDlg message handlers

BOOL CCalculatorDlg::OnInitDialog()
{
CDialog::OnInitDialog();
SetWindowText("vc课程设计——计算器 ");

/////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////
CButton* p; //设置IDC_RADIO_RADIAN为首选
p=(CButton*)GetDlgItem(IDC_RADIO_RADIAN);  
p->SetCheck(1); 

CButton* r; //设置IDC_RADIO_Dec为首选
r=(CButton*)GetDlgItem(IDC_RADIO_Dec);  
r->SetCheck(1); 

CComboBox* q; //设置"常数项"字符为首选
q=(CComboBox*)GetDlgItem(IDC_COMBO_Cns);
q->SetCurSel(0); 
/////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////
// Add "About..." menu item to system menu.
// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);

CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}

// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon

// TODO: Add extra initialization here
m_menu2.CreatePopupMenu();

return TRUE; // return TRUE unless you set the focus to a control
}

void CCalculatorDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}
void CCalculatorDlg::OnPaint() 
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting

SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;

// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}

// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CCalculatorDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}


void CCalculatorDlg::OnOK() 
{
UpdateData(1);
if(m_radio_degree.GetCheck()==1) calcu.m_bDegree=1;
if(m_radio_radian.GetCheck()==1) calcu.m_bDegree=0;
// calcu.Dec2Hex(&m_strEdit);
CString strRes=calcu.MainPro(m_strEdit);
// m_combo_histrEdit.AddString(m_strEdit);
// m_combo_histrresult.AddString(strRes);
m_strRes=strRes;
m_strHistory=m_strEdit+"="+m_strRes+"\r\n"+m_strHistory;
UpdateData(0);
// CDialog::OnOK();
}

void CCalculatorDlg::OnAbout() 
{
CAboutDlg dlg;
dlg.DoModal();
}
void CCalculatorDlg::OnChangeEditInput() 
{
// TODO: If this is a RICHEDIT control, the control will not
// send this notification unless you override the CDialog::OnInitDialog()
// function and call CRichEditCtrl().SetEventMask()
// with the ENM_CHANGE flag ORed into the mask.

// TODO: Add your control notification handler code here

}
void CCalculatorDlg::OnBtn0() 
{
UpdateData();
m_strEdit+="0";
UpdateData(false);
}
void CCalculatorDlg::OnBtn1() 
{
UpdateData();
m_strEdit+="1";
UpdateData(false);
}

void CCalculatorDlg::OnBtnDot() 
{
UpdateData();
m_strEdit+=".";
UpdateData(false);
}
void CCalculatorDlg::OnBtnNgt() 
{
UpdateData(TRUE);
if(m_strEdit.GetAt(0)=='-')
m_strEdit=m_strEdit.Mid(1);
else
m_strEdit="-"+m_strEdit;
UpdateData(FALSE);
}

void CCalculatorDlg::OnBtnA() 
{
UpdateData();
m_strEdit+="a";
UpdateData(false);
}
void CCalculatorDlg::OnBtnAdd() 
{
UpdateData();
m_strEdit+="+";
UpdateData(false);
}

void CCalculatorDlg::OnBtnMin() 
{
UpdateData();
m_strEdit+="-";
UpdateData(false);
}

void CCalculatorDlg::OnBtnMul() 
{
UpdateData();
m_strEdit+="*";
UpdateData(false);
}

void CCalculatorDlg::OnBtnDiv() 
{
UpdateData();
m_strEdit+="/";
UpdateData(false);
}

void CCalculatorDlg::OnBtnLbar() 
{
UpdateData();
m_strEdit+="(";
UpdateData(false);
}

void CCalculatorDlg::OnBtnRbar() 
{
UpdateData();
m_strEdit+=")";
UpdateData(false);
}

void CCalculatorDlg::OnBtnBack() 
{
m_strEdit.Delete(m_strEdit.GetLength()-1,1);
UpdateData(false);
}

void CCalculatorDlg::OnBtnPow() 
{
UpdateData();
m_strEdit+="^";
UpdateData(false);
}

void CCalculatorDlg::OnBtnMod() 
{
UpdateData();
m_strEdit+="%";
UpdateData(false);
}

void CCalculatorDlg::OnBtnPi() 
{
UpdateData();
m_strEdit+="3.142";
UpdateData(false);
}

void CCalculatorDlg::OnBtnEe() 
{
UpdateData();
m_strEdit+="2.72";
UpdateData(false);
}

你想知道什么？？这是一个计算器的代码~~~

MFC原理的书看MFC深入浅出~

孙鑫 VC++详解。看看就明白了。。

好像侯捷有本<<MFC深入浅出>>吧，多年以前拜读过。