demo3dlg.cpp

本程序为了在对输入的文件进行HUFFMAN编码

// demo3Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "demo3.h"
#include "demo3Dlg.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()

/////////////////////////////////////////////////////////////////////////////
// CDemo3Dlg dialog

CDemo3Dlg::CDemo3Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CDemo3Dlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CDemo3Dlg)
	m_strPass = _T("tiger");
	m_strSource = _T("tian");
	m_strSql = _T("select * from emp");
	m_strUser = _T("scott");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
		m_pMapFile = NULL;
}

void CDemo3Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CDemo3Dlg)
	DDX_Control(pDX, IDC_GRIDMY, m_Grid);
	DDX_Text(pDX, IDC_EDITPASS, m_strPass);
	DDX_Text(pDX, IDC_EDITSOURCE, m_strSource);
	DDX_Text(pDX, IDC_EDITSQL, m_strSql);
	DDX_Text(pDX, IDC_EDITUSER, m_strUser);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CDemo3Dlg, CDialog)
	//{{AFX_MSG_MAP(CDemo3Dlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BTNQUERY, OnBtnquery)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDemo3Dlg message handlers

BOOL CDemo3Dlg::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
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CDemo3Dlg::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 CDemo3Dlg::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 CDemo3Dlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CDemo3Dlg::OnBtnquery() 
{
	// TODO: Add your control notification handler code here
		this->Release();
	
	CString strConn;
	UpdateData(TRUE);

	BOOL bResult = m_db.ConnectDB(m_strSource, m_strUser, m_strPass);
	if(bResult == FALSE)
	{
		return;
	}
	m_ImageList.DeleteImageList();
	m_ImageList.Create(MAKEINTRESOURCE(IDB_BITMAP1), 16, 1, RGB(255,255,255));
	m_Grid.SetImageList(&m_ImageList);
	m_Grid.GetDefaultCell(FALSE,TRUE)->SetFormat(DT_CENTER|DT_VCENTER|DT_SINGLELINE|DT_NOPREFIX|DT_END_ELLIPSIS);
	m_pMapFile = new CMyODBCDBGridFile(&m_Grid, &m_db, m_strSql, "c:\\csl.txt");
	if(m_pMapFile == NULL)
	{
		m_db.DisConnect();
		return;
	}
	CFont *pFont = m_Grid.GetFont();
	if (pFont) 
	{
		LOGFONT lf;
		pFont->GetLogFont(&lf);
		lf.lfItalic = (BYTE) TRUE;
		m_Grid.GetDefaultCell(FALSE, TRUE)->SetFont(&lf);
    }
	
	m_pMapFile->InitGrid();
	
	
}

void CDemo3Dlg::Release()
{
	if(this->m_pMapFile)
	{
		m_pMapFile->Release();
		m_db.DisConnect();
		delete m_pMapFile; m_pMapFile = NULL;
	}
}

BOOL CDemo3Dlg::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult) 
{
	// TODO: Add your specialized code here and/or call the base class
	if (wParam == (WPARAM)m_Grid.GetDlgCtrlID())
    {
        *pResult = 1;
        GV_DISPINFO *pDispInfo = (GV_DISPINFO*)lParam;
        if (GVN_GETDISPINFO  == pDispInfo->hdr.code)
        {
			SetGridItem(pDispInfo);
			return TRUE;
        }
    }
	return CDialog::OnNotify(wParam, lParam, pResult);
}

void CDemo3Dlg::SetGridItem(GV_DISPINFO *pDispInfo)
{
	m_pMapFile->SetGridText(pDispInfo);
	if((pDispInfo->item.col ==0) && (pDispInfo->item.row != 0))
	{
		pDispInfo->item.iImage = rand()%m_ImageList.GetImageCount();
		pDispInfo->item.mask  |= (GVIF_IMAGE);
	}
	if((pDispInfo->item.col == 6) && (atoi(pDispInfo->item.strText) > 2000))
	{
		COLORREF clr = RGB( 128, 128,  128);
		pDispInfo->item.crBkClr = clr;             // or - m_Grid.SetItemBkColour(row, col, clr);
		pDispInfo->item.crFgClr = RGB(255,0,0);    // or - m_Grid.SetItemFgColour(row, col, RGB(255,0,0));				    
		pDispInfo->item.mask    |= (GVIF_BKCLR|GVIF_FGCLR);
	}

}