huffmandlg.cpp

HUFFMAN编码在信息论中的应用实例！

// HUFFMANDlg.cpp : implementation file
//

#include "stdafx.h"
#include "HUFFMAN.h"
#include "HUFFMANDlg.h"
#include "HUFFMANCODE.h"
#include "math.h"


#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

int itemdel;//被选中的行号,删除指定行时用
int listinsize,listoutsize;//输入列表和输出列表的行数
CString sFilePath;//输入文件的路径
node *head,*rear,*currptr,*currptr1,*prevptr,*head1,*rear1;
node *root,*min[2];
void PreOrder(node *t);//先根遍历进行编码
void PreOrderto0(node *t);//先根遍历初始化树的编码
int findsign(CString str,node *t);//在t根的树中查找sign为str的点,并用currptr1指向找到的点



/////////////////////////////////////////////////////////////////////////////
// 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()

/////////////////////////////////////////////////////////////////////////////
// CHUFFMANDlg dialog

CHUFFMANDlg::CHUFFMANDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CHUFFMANDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CHUFFMANDlg)
	m_sign = _T("");
	m_probablility = 0.0;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CHUFFMANDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CHUFFMANDlg)
	DDX_Control(pDX, IDC_LIST_OUT, m_LISTOUT);
	DDX_Control(pDX, IDC_LIST_IN, m_LISTIN);
	DDX_Text(pDX, IDC_EDIT_SIGN, m_sign);
	DDX_Text(pDX, IDC_EDIT_PRO, m_probablility);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CHUFFMANDlg, CDialog)
	//{{AFX_MSG_MAP(CHUFFMANDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_NOTIFY(HDN_ITEMCLICK, IDC_LIST_IN, OnItemclickListIn)
	ON_NOTIFY(NM_CLICK, IDC_LIST_IN, OnClickListIn)
	ON_BN_CLICKED(IDC_BUTTON_DEL, OnButtonDel)
	ON_BN_CLICKED(IDC_BUTTON_NEW, OnButtonNew)
	ON_BN_CLICKED(IDC_BUTTON_INFILE, OnButtonInfile)
	ON_BN_CLICKED(IDC_BUTTON_DELALL, OnButtonDelall)
	ON_BN_CLICKED(IDC_BUTTON_REDO, OnButtonRedo)
	ON_BN_CLICKED(IDC_BUTTON_CODE, OnButtonCode)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CHUFFMANDlg message handlers

BOOL CHUFFMANDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// 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

	itemdel=-1;
	//设置输出表的样式、列的标题
	m_LISTIN.SetExtendedStyle   (LVS_EX_FULLROWSELECT   |LVS_EX_GRIDLINES   |LVS_EX_INFOTIP);
	m_LISTIN.InsertColumn(0,"符号",LVCFMT_LEFT,50);
	m_LISTIN.InsertColumn(1,"概率",LVCFMT_LEFT,95);
	m_LISTOUT.SetExtendedStyle   (LVS_EX_FULLROWSELECT   |LVS_EX_GRIDLINES   |LVS_EX_INFOTIP);
	m_LISTOUT.InsertColumn(0,"符号",LVCFMT_LEFT,50);
	m_LISTOUT.InsertColumn(1,"编码",LVCFMT_LEFT,195);
	listinsize=0;
	listoutsize=0;



	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CHUFFMANDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CHUFFMANDlg::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 CHUFFMANDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CHUFFMANDlg::OnItemclickListIn(NMHDR* pNMHDR, LRESULT* pResult) 
{
	AfxMessageBox("fjkdfsdfgdsfgfdsk");
	HD_NOTIFY *phdn = (HD_NOTIFY *) pNMHDR;
	
	// TODO: Add your control notification handler code here
	
	*pResult = 0;
}




//得到所选行
void CHUFFMANDlg::OnClickListIn(NMHDR* pNMHDR, LRESULT* pResult) 
{
	// TODO: Add your control notification handler code here
           
           DWORD dwPos = GetMessagePos();
           CPoint point( LOWORD(dwPos), HIWORD(dwPos) );
   
           m_LISTIN.ScreenToClient(&point);
   
           LVHITTESTINFO lvinfo;
           lvinfo.pt = point;
           lvinfo.flags = LVHT_ABOVE;
     
           int nItem = m_LISTIN.SubItemHitTest(&lvinfo);
           if(nItem != -1)
           {
			   //使itemdel等于被选的行
                CString strtemp;
				itemdel=lvinfo.iItem;
		   }
	
	*pResult = 0;
}


//删除选定的项
void CHUFFMANDlg::OnButtonDel() 
{
	// TODO: Add your control notification handler code here
	//删除head1指向的链表
	node *temp;
	while(head1!=NULL)
	{
		temp=head1;
		head1=head1->next;
		delete temp;
	}
	//从列表中删除选定的项,并删除对应结点
	if(itemdel!=-1)
	{
		currptr=head;
		CString str=m_LISTIN.GetItemText(itemdel,0);
		
		while(currptr->sign!=str&&currptr!=NULL)
		{
			prevptr=currptr;
			currptr=currptr->next;
		}
		if(currptr==head)
		{
			head=head->next;
			delete currptr;
		}
		else if(currptr==rear)
		{
			rear=prevptr;
			rear->next=NULL;
			delete currptr;
		}
		else
		{
			prevptr->next=currptr->next;
			delete currptr;
		}
		m_LISTIN.DeleteItem(itemdel);
		listinsize=listinsize-1;
		listoutsize=0;
		itemdel=-1;
	}
	else
		MessageBox("请选中要删除的字符","错误",MB_OK);
	
}


//键入新信源符号
void CHUFFMANDlg::OnButtonNew() 
{
	// TODO: Add your control notification handler code here
	//读取编辑框数据
	UpdateData(TRUE);
	if(m_probablility>1||m_probablility<0)
	{
		MessageBox("概率必须大于0且小于1,请重新输入","错误");
		return;
	}
	if(m_sign=="")
	{
		MessageBox("请输入信源符号","错误");
		return;
	}
	CHUFFMANDlg::rearadd(m_sign,m_probablility);
	CHUFFMANDlg::OnButtonRedo();



}


//在链尾加入结点
void CHUFFMANDlg::rearadd(CString str,double pro)
{
	currptr=head;
	while(currptr!=NULL)
	{
		if(currptr->sign==str)
		{
			MessageBox("对不起,此符号已存在,输入无效");
			return;
		}
		currptr=currptr->next;
	}
	node *temp=new node;

	if(head==NULL)
	{		
		head=temp;
		rear=head;
		prevptr=head;
		currptr=head;
		currptr->sign=str;