wndsnapdlg.cpp

c++系统开发实例精粹内附的80例源代码 环境:windows2000,c++6.0

// WndSnapDlg.cpp : implementation file
//

#include "stdafx.h"
#include "WndSnap.h"
#include "WndSnapDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CWndSnapDlg dialog

CWndSnapDlg::CWndSnapDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CWndSnapDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CWndSnapDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CWndSnapDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CWndSnapDlg)
	DDX_Control(pDX, IDC_WNDSNAP, m_bmpShow);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CWndSnapDlg, CDialog)
	//{{AFX_MSG_MAP(CWndSnapDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_SNAP, OnSnap)
	ON_WM_DESTROY()
	//}}AFX_MSG_MAP
	ON_MESSAGE(WM_HOTKEY,OnHotKey)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CWndSnapDlg message handlers
#define OVEREDGE 5
BOOL CWndSnapDlg::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
	// 定义热键
	RegisterHotKey(m_hWnd,1688,MOD_CONTROL | MOD_SHIFT,'A' );
    RegisterHotKey(m_hWnd,2688,MOD_CONTROL | MOD_SHIFT,'a' ); 	

	// 初始化内存DC
	CDC * pDC = m_bmpShow.GetDC();
	m_memDC.CreateCompatibleDC(pDC);

	// 初始化位图对象
	m_bmpShow.GetWindowRect(&m_rcShow);
	m_memBMP.CreateCompatibleBitmap(pDC, m_rcShow.Width() - OVEREDGE,
		m_rcShow.Height() - OVEREDGE);
	m_memDC.SelectObject(&m_memBMP);
	m_bmpShow.ReleaseDC(pDC);

	// 初始化对话框中用于显示的图像控件区域
	m_memDC.BitBlt(0,0,m_rcShow.Width() - OVEREDGE,
		m_rcShow.Height() - OVEREDGE,NULL,0,0,WHITENESS);

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

void CWndSnapDlg::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 CWndSnapDlg::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();
		m_bmpShow.GetWindowRect(&m_rcShow);
		CDC *pShowDC = m_bmpShow.GetDC();
		pShowDC->BitBlt(0, 0, m_rcShow.Width(), m_rcShow.Height(), &m_memDC, 0, 0, SRCCOPY);
			m_bmpShow.ReleaseDC(pShowDC);
	}
}

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

void CWndSnapDlg::OnSnap() 
{
	// TODO: Add your control notification handler code here
	RECT rect;
	m_bmpShow.GetWindowRect(&rect);

	// 获得活动窗体指针
	CWnd *pTarWnd = this->GetActiveWindow();

	// 获得活动窗体的设备上下文指针
	CDC  *pTarDC  = pTarWnd->GetWindowDC();

	// 获得活动窗体矩形
	CRect rcTar;
	pTarWnd->GetWindowRect(&rcTar);
	m_bmpShow.GetWindowRect(&m_rcShow);

	// 将活动窗体的图像复制到图像控件中
	m_memDC.StretchBlt(0,0,m_rcShow.Width(),m_rcShow.Height(),pTarDC,
				0,0,rcTar.Width(),rcTar.Height(),SRCCOPY);

	// 释放设备上下文指针
	pTarWnd->ReleaseDC(pTarDC);
	
	// 重绘图像控件区域 
	this->InvalidateRect(&m_rcShow);
}

LRESULT CWndSnapDlg::OnHotKey(WPARAM wParam, LPARAM lParam)
{
    if (wParam == 1688 || wParam == 2688) 
	{
		OnSnap();
	}

	return 0;
}

void CWndSnapDlg::OnDestroy() 
{
	CDialog::OnDestroy();
	
	// TODO: Add your message handler code here
	UnregisterHotKey(m_hWnd,1688); 
    UnregisterHotKey(m_hWnd,2688); 
}