bmptojpgdlg.cpp

VisualC高级编程技术精粹.rar

// BmpToJpgDlg.cpp : implementation file
//

#include "stdafx.h"
#include "BmpToJpg.h"
#include "BmpToJpgDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CBmpToJpgDlg dialog

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

	m_bIsClickHelpBtn = FALSE;
}

void CBmpToJpgDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CBmpToJpgDlg)
	DDX_Text(pDX, IDC_EDIT_BMP_FILE_NAME, m_csBmp);
	DDX_Text(pDX, IDC_EDIT_JPG_FILE_NAME, m_csJpg);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CBmpToJpgDlg, CDialog)
	//{{AFX_MSG_MAP(CBmpToJpgDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON_COMPRESS, OnButtonCompress)
	ON_BN_CLICKED(IDC_BUTTON_QUIT, OnButtonQuit)
	ON_BN_CLICKED(IDC_BUTTON_OPEN_BMP, OnButtonOpenBmp)
	ON_BN_CLICKED(IDC_BUTTON_SAVE_JPG, OnButtonSaveJpg)
	ON_BN_CLICKED(IDC_BUTTON_HELP, OnButtonHelp)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CBmpToJpgDlg message handlers

BOOL CBmpToJpgDlg::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
	// 显示提示信息
	ModifyWndInfo();
	DisplayInfo(IDC_STATIC_TIP_INFO,_T("本程序将bmp文件压缩成jpg文件。"));
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

typedef  bool(__stdcall CHANGE)(char *,char *);

void CBmpToJpgDlg::OnButtonCompress() 
{
	// TODO: Add your control notification handler code here
	UpdateData();

	// 判断是否打开了要压缩的Bmp文件
	if (m_csBmp.IsEmpty())
	{
		ModifyWndInfo();
		DisplayInfo(IDC_STATIC_TIP_INFO,_T("你还没有选择Bmp文件！"));
		return;
	}

	//  判断是否输入了要保存的文件名
	if (m_csJpg.IsEmpty())
	{
		ModifyWndInfo();
		DisplayInfo(IDC_STATIC_TIP_INFO,_T("你还没有输入要保存的文件名！"));
		return;
	}

	HINSTANCE hInst;
	CHANGE *pFunc;
	hInst = ::LoadLibrary("jpgdll.dll"); //显式加载DLL
	pFunc = (CHANGE*)::GetProcAddress(hInst,"BmpToJpg");
	pFunc(m_csBmp.GetBuffer(50),m_csJpg.GetBuffer(50));

	// 释放buffer
	m_csBmp.ReleaseBuffer();
	m_csJpg.ReleaseBuffer();

	::FreeLibrary(hInst);

	DisplayInfo(IDC_STATIC_TIP_INFO,_T("压缩完毕!"));
}

void CBmpToJpgDlg::OnButtonQuit() 
{
	// TODO: Add your control notification handler code here
	CDialog::OnCancel(); //退出程序 
}

void CBmpToJpgDlg::OnButtonOpenBmp() 
{
	// TODO: Add your control notification handler code here
	CFileDialog dlg(TRUE,"bmp",NULL,OFN_HIDEREADONLY |OFN_OVERWRITEPROMPT,
		            "Bmp File(*.bmp)|*.bmp||");
	if(dlg.DoModal()==IDOK)
	{
		m_csBmp = dlg.GetPathName();
		UpdateData(FALSE);
	}
}

void CBmpToJpgDlg::OnButtonSaveJpg() 
{
	// TODO: Add your control notification handler code here
	CFileDialog dlg(FALSE,"jpg",NULL,OFN_HIDEREADONLY |OFN_OVERWRITEPROMPT,
		            "Jpg File(*.jpg)|*.jpg||");
	if(dlg.DoModal()==IDOK)
	{
		m_csJpg = dlg.GetPathName();
		UpdateData(FALSE);
	}
}

void CBmpToJpgDlg::DisplayInfo(int nID,CString csTipInfo)
{	
	GetDlgItem(nID)->SetWindowText(csTipInfo);
}

void CBmpToJpgDlg::OnButtonHelp() 
{
	// TODO: Add your control notification handler code here
	m_bIsClickHelpBtn = TRUE;

	// 将"窗口信息: " 改成 "使用说明"
	DisplayInfo(IDC_STATIC_TIP_WND,_T("使用说明: "));

	// 显示使用说明
	DisplayInfo(IDC_STATIC_TIP_INFO,
		        _T("使用本软件要按照下面的步骤操作:\r\n1.点击打开按钮，选择Bmp文件。\r\n2.点击保存按钮，输入要保存的文件名。\r\n3.点击压缩按钮，开始压缩。"));
}

void CBmpToJpgDlg::ModifyWndInfo()
{
	if (m_bIsClickHelpBtn)
	{
		DisplayInfo(IDC_STATIC_TIP_WND,_T("窗口信息: "));
	}
}