bmpfielddlg.cpp

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// BmpFieldDlg.cpp : implementation file
//

#include "stdafx.h"
#include "BmpField.h"
#include "BmpFieldDlg.h"
#include "ImageData.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()

/////////////////////////////////////////////////////////////////////////////
// CBmpFieldDlg dialog

CBmpFieldDlg::CBmpFieldDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CBmpFieldDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CBmpFieldDlg)
		// 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 CBmpFieldDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CBmpFieldDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CBmpFieldDlg, CDialog)
	//{{AFX_MSG_MAP(CBmpFieldDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_LOADIMAG, OnLoadimag)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CBmpFieldDlg message handlers

BOOL CBmpFieldDlg::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 CBmpFieldDlg::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.

//显示位图
void CBmpFieldDlg::OnPaint() 
{
	//获得DC
	CPaintDC dc(this);
	if (!(OleBmp.m_hObject == NULL))
	{
		//创建内存设备场景
		CDC dcMem; 
		dcMem.CreateCompatibleDC( &dc ); 
		CBitmap*  pbmpOld ;
		
		BITMAP  BmpSize ; 
		OleBmp.GetBitmap(&BmpSize); //get Image Size
		
		pbmpOld = dcMem.SelectObject(&OleBmp);

		//显示位图
		dc.StretchBlt( 5, 5, 150, 200, &dcMem, 0, 0, BmpSize.bmWidth, BmpSize.bmHeight, SRCCOPY);
		dcMem.SelectObject( pbmpOld );
	}
}

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

//读位图数据，并创建位图
BOOL CBmpFieldDlg::ReadFromBLOB(CByteArray & DBArray)
{
	CByteArray Array;
	Array.Copy( DBArray); 
	
	//获得位图文件头信息长度
	int HeaderLen =   78 + sizeof(BITMAPFILEHEADER); 
	Array.RemoveAt( 0, HeaderLen ); // I cut all Headers 
    
	//获得位图信息  
	BITMAPINFOHEADER &bmiHeader = *(LPBITMAPINFOHEADER)
		Array.GetData() ;
    BITMAPINFO &bmInfo = *(LPBITMAPINFO)Array.GetData() ;
	
	//获得位图颜色数
    int nColors = bmiHeader.biClrUsed ?
		bmiHeader.biClrUsed : 1 << bmiHeader.biBitCount;

	//获得位图数据
    LPVOID lpDIBBits;
    if( bmInfo.bmiHeader.biBitCount > 8 )
       lpDIBBits = (LPVOID)((LPDWORD)(bmInfo.bmiColors 
	   + bmInfo.bmiHeader.biClrUsed) + 
       ((bmInfo.bmiHeader.biCompression == BI_BITFIELDS) ?
	   3 : 0));
     else
        lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);

     CClientDC dc(NULL);

	 //创建位图
	 HBITMAP hBmp = CreateDIBitmap( dc.m_hDC,   
			                    &bmiHeader,     
                                CBM_INIT,       
                                lpDIBBits,      
                                &bmInfo,        
                                DIB_RGB_COLORS);
     
	OleBmp.Attach( hBmp );

	//清除临时数组
	Array.RemoveAll();

	return TRUE;
}

//获得位图数据
void CBmpFieldDlg::OnLoadimag() 
{
	//打开数据库
	CImageData db;
	db.Open();

	ReadFromBLOB(db.m_Images);
	//显示位图
	Invalidate();	

	//关闭数据库
	db.Close();	
}