cdlgoracleimagerwdlg.cpp

这是书上的代码

// CDlgOracleImageRWDlg.cpp : implementation file
#include "stdafx.h"
#include "CDlgOracleImageRW.h"
#include "CDlgOracleImageRWDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CCDlgOracleImageRWDlg dialog

CCDlgOracleImageRWDlg::CCDlgOracleImageRWDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CCDlgOracleImageRWDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CCDlgOracleImageRWDlg)
	m_ID = _T("");
	m_Name = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32

	//获得主框架指针
	pMainWnd=AfxGetMainWnd();
	//给变量赋初值
	m_bModify = FALSE;
	m_hPhotoBitmap = NULL;
	m_pBMPBuffer = NULL;
}

void CCDlgOracleImageRWDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CCDlgOracleImageRWDlg)
	DDX_Text(pDX, IDC_ID, m_ID);
	DDX_Text(pDX, IDC_Name, m_Name);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CCDlgOracleImageRWDlg, CDialog)
	//{{AFX_MSG_MAP(CCDlgOracleImageRWDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_PREVIOUSUSER, OnPrevioususer)
	ON_BN_CLICKED(IDC_NEXTUSER, OnNextuser)
	ON_BN_CLICKED(IDC_SAVEINFO, OnSave)
	ON_BN_CLICKED(IDC_ADDUSER, OnAddPhoto)
	ON_BN_CLICKED(IDC_DELETEUSER, OnDeletePhoto)
	ON_BN_CLICKED(IDC_SELECTPHOTO, OnSelectphoto)
	ON_WM_PAINT()
	ON_WM_DESTROY()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCDlgOracleImageRWDlg message handlers

BOOL CCDlgOracleImageRWDlg::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
	//连接数据库
	odb.Open("blobdb", "scott", "tiger");
	//打开记录集
	odyn.Open(odb, "SELECT * FROM IMAGE ");
	//检查记录集是否打开
	if (!odyn.IsOpen())
	{	
		CString err;
		CString err1;
		err.Format("%s", (char*)(odb.GetErrorText()) );
		err1.Format("%s", (char*)(odb.GetErrorText()) );
		AfxMessageBox(err);
		AfxMessageBox(err1);
	}
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CCDlgOracleImageRWDlg::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 CCDlgOracleImageRWDlg::OnPaint() 
{
	CPaintDC dc(this);
	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
	{
		//将图像显示在对话框控件中
		DrawUserPhoto(50,30,&dc);
		CDialog::OnPaint();
	}
}

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

void CCDlgOracleImageRWDlg::OnPrevioususer() 
{
	// TODO: Add your control notification handler code here
	// 检查记录集中是否有记录
	if(odyn.GetRecordCount()==0)
	{
		AfxMessageBox("记录集中没有图片！请输入");
		return;
	}
	//移到下一个记录
	odyn.MovePrev();
	//是否到首记录标志处
	if(odyn.IsBOF())
		odyn.MoveFirst();//移到第一个记录
	//从Oracle数据库中读出像片数据
	ReadData();
	Invalidate();
}

void CCDlgOracleImageRWDlg::OnNextuser() 
{
	// TODO: Add your control notification handler code here
	// 检查记录集中是否有记录
	if(odyn.GetRecordCount()==0)
	{
		AfxMessageBox("记录集中没有图片！请输入");
		return;
	}
	//移到下一个记录
	odyn.MoveNext();
	//是否到末记录标志处
	if(odyn.IsEOF())
		odyn.MoveLast();
	ReadData();
	//从Oracle数据库中读出像片数据
	Invalidate();
}

void CCDlgOracleImageRWDlg::OnSave() 
{
	// TODO: Add your control notification handler code here
	m_bNewImage = true;
	if(!m_bModify) return;
	UpdateData();
	if( m_Name == "")
	{
		AfxMessageBox("您没有提供完整的用户信息。\r\n这些信息包括:用户名、年龄、照片");
		return;
	}
	//指向缓存的指针
	char	*pBuf = m_pBMPBuffer;
	//定义一个结果对象，返回值0为失败，1为成功
  	oresult ores;
	//移动到上一个记录
	ores = odyn.MoveLast();
	//定义一个OValue值对象
	OValue val;
	//对象置空值
	val.SetEmpty();
	
	//准备添加一个记录
	odyn.AddNewRecord();
	//把ID号值放到第一个字段
	odyn.SetFieldValue("ID", m_ID);
	//把名字放到第二个字段
	ores=odyn.SetFieldValue("NAME", m_Name);
	//把空值放到DATA字段
	ores = odyn.SetFieldValue((const char *)"DATA", val);
	//更新记录集
	ores = odyn.Update();
	//移动到上一个字段,此值非常重要,否者会造成属性值和BLOB图像数据的错位
	////////////////////////////////////////////////////////////////////
	odyn.MoveLast();
	////////////////////////////////////////////////////////////////////


	//定义一个OBlob对象
	OBlob oblob;
	//开始编辑记录集
	odyn.StartEdit();
	//把oblob对象定位到OBLOB字段上
	odyn.GetFieldValue("DATA", &oblob);
	//定义一个缓冲指针
	unsigned char *buffer = 0;
	try
	{				
		// 计算一个合适的缓冲值大小
		unsigned long optchunk = oblob.GetOptimumChunkSize();	
		//在分配中开辟缓冲区;用分块循环的方法可以减小开辟大块内存
		unsigned int bufsize = ((int)(32768/optchunk)) *optchunk;
		//用分块循环的方法可以减小开辟大块内存
		buffer = (unsigned char *)malloc(bufsize);
		////定义一个fstream 对象
		fstream fs;
		//打开一个图像文件
		fs.open(pathname, ios::in);
		//设置模式
		fs.setmode(filebuf::binary);
		//移动指针到文件末尾
		fs.seekg(0, ios::end);
		//计算文件长度
		unsigned long filesize = fs.tellg();
		//回到文件指针头
		fs.seekg(0, ios::beg);
		//定义一个变量,计算一共书写的字节数
		unsigned long totalwritten = 0;
		//定义一个变量,计算每次读的字节数
		unsigned long amtread = 0;
		//第一块读取的OBLOB字段标记
		int piecetype = OLOB_FIRST_PIECE;
		
		//分块读入的方法可以充分利用数据流的优势,不用开很大的内存
		if (filesize <= bufsize)
			//如果文件数据字节数小于一块内存,只需一次读入
			piecetype = OLOB_ONE_PIECE;
		else	
			//如果文件数据字节数大于一块内存,设置文件数据流读入方式		
			oblob.EnableStreaming(filesize);
		while(totalwritten != filesize)
		{