adoblobdlg.cpp

用ADO进行数据访问的例子

// ADOBlobDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ADOBlob.h"
#include "ADOBlobDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

#include <iostream.h>
#include <stdlib.h>
#include <conio.h>
#include <stdio.h>
#include <dos.h>
#include <fstream.h>
#include <iostream.h>
//时间函数头文件
#include <time.h>
#include <stdio.h>
#include <dos.h>
#include <iostream.h>
//end of 时间函数头文件

int gettime(char *sstime[30]);
int gettime(char *sstime[30])
{	time_t t;
	struct tm *area;
	char *st;
	t=time(NULL);
	// printf("从各林位置时间到现在的秒数是 :%ld",t);
	area=localtime(&t);
	st=asctime(area);
	*sstime=asctime(area);

	cout<<st<<endl;
	AfxMessageBox(st);
	//printf("local time is:%s",asctime(area));
	return 0;
}






extern CADOBlobApp theApp;
/////////////////////////////////////////////////////////////////////////////
// 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()

/////////////////////////////////////////////////////////////////////////////
// CADOBlobDlg dialog

CADOBlobDlg::CADOBlobDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CADOBlobDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CADOBlobDlg)
	m_UserName = _T("");
	m_Old = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	m_bModify = FALSE;
	m_hPhotoBitmap = NULL;
	m_pBMPBuffer = NULL;
}

void CADOBlobDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CADOBlobDlg)
	DDX_Control(pDX, IDC_DELETEUSER, m_buttonDeleteUser);
	DDX_Control(pDX, IDC_PREVIOUSUSER, m_buttonPreviousUser);
	DDX_Control(pDX, IDC_NEXTUSER, m_buttonNextUser);
	DDX_Control(pDX, IDC_OLD, m_editOld);
	DDX_Control(pDX, IDC_USERNAME, m_editUserName);
	DDX_Control(pDX, IDC_SELECTPHOTO, m_buttonSelectPhoto);
	DDX_Control(pDX, IDC_SAVEINFO, m_buttonSaveInfo);
	DDX_Text(pDX, IDC_USERNAME, m_UserName);
	DDX_Text(pDX, IDC_OLD, m_Old);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CADOBlobDlg, CDialog)
	//{{AFX_MSG_MAP(CADOBlobDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_ADDUSER, OnAddUser)
	ON_EN_CHANGE(IDC_USERNAME, OnChangeUsername)
	ON_EN_CHANGE(IDC_OLD, OnChangeOld)
	ON_BN_CLICKED(IDC_SAVEINFO, OnSaveinfo)
	ON_BN_CLICKED(IDC_SELECTPHOTO, OnSelectphoto)
	ON_BN_CLICKED(IDC_NEXTUSER, OnNextUser)
	ON_BN_CLICKED(IDC_PREVIOUSUSER, OnPreviousUser)
	ON_BN_CLICKED(IDC_DELETEUSER, OnDeleteUser)
	ON_BN_CLICKED(IDC_UPDATE, OnUpdate)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CADOBlobDlg message handlers

BOOL CADOBlobDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	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);
		}
	}

	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon

	m_bNewUser = FALSE;
	m_pRecordset.CreateInstance("ADODB.Recordset");
	//m_pRecordset->put_CursorType(adOpenDynamic);
	//m_pRecordset->put_LockType(adLockPessimistic);
	m_pRecordset->put_CursorLocation(adUseClient);
	char  sstime[20];
	AfxMessageBox("开始打开记录集合");
	gettime((char ** )sstime);
	HRESULT hr = m_pRecordset->Open("SELECT * FROM bmp",_variant_t((IDispatch *)theApp.m_pConnection,true),adOpenDynamic,adLockPessimistic,adCmdText);
   	AfxMessageBox("结束打开记录集合");
	gettime((char ** )sstime);
	
	if(SUCCEEDED(hr))
	{
		ReadData();
	}
	ResetControls();
	return TRUE;  // return TRUE  unless you set the focus to a control
}

/////////////////////读取记录集当前记录中数据 ，包括图像数据//////////////
void CADOBlobDlg::ReadData()
{
	DestroyPhoto();						///清除原图像 
	if(m_pRecordset->adoEOF||m_pRecordset->BOF) 
	{
		m_UserName.Empty();
		m_Old.Empty();
		UpdateData(FALSE);
		return;
	}
	long lDataSize = m_pRecordset->GetFields()->GetItem("photo")->ActualSize;
	if(lDataSize > 0)
	{
		_variant_t			varBLOB;
		varBLOB = m_pRecordset->GetFields()->GetItem("photo")->GetChunk(lDataSize);
		if(varBLOB.vt == (VT_ARRAY | VT_UI1))
		{
			if(m_pBMPBuffer = new char[lDataSize+1])				///重新分配必要的存储空间
			{	
				char *pBuf = NULL;
				SafeArrayAccessData(varBLOB.parray,(void **)&pBuf);
				memcpy(m_pBMPBuffer,pBuf,lDataSize);				///复制数据到缓冲区m_pBMPBuffer
				SafeArrayUnaccessData (varBLOB.parray);
				m_nFileLen = lDataSize;
				m_hPhotoBitmap = BufferToHBITMAP();					///生成BITMAP对象
			}
		}
	}
	m_UserName = m_pRecordset->GetCollect("username").bstrVal;
	m_Old.Format("%d",m_pRecordset->GetCollect("old").lVal);
	m_editUserName.EnableWindow();
	m_editOld.EnableWindow();
	m_buttonSelectPhoto.EnableWindow();
	m_buttonDeleteUser.EnableWindow();
	UpdateData(FALSE);
}

void CADOBlobDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

/////////////////在屏幕上显示图像///////////////////
void CADOBlobDlg::DrawUserPhoto(int x, int y, CDC *pDC)
{
	if(!m_hPhotoBitmap) return;
	HBITMAP OldBitmap;
	CDC MemDC;
	MemDC.CreateCompatibleDC(pDC);
	OldBitmap=(HBITMAP)MemDC.SelectObject(m_hPhotoBitmap);
	pDC->BitBlt(x,y,900,700,&MemDC,0,0,SRCCOPY);
	MemDC.SelectObject(OldBitmap);
}

void CADOBlobDlg::OnPaint() 
{
	CPaintDC dc(this);
	if (IsIconic())
	{
		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
	{
		DrawUserPhoto(50,30,&dc);
		CDialog::OnPaint();
	}
}

HCURSOR CADOBlobDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CADOBlobDlg::OnAddUser() 
{
	if(m_bModify)
	{
		int nRet = MessageBox("当前用户信息尚未保存，是否保存?","VC知识库 WWW.VCKBASE.COM",MB_YESNOCANCEL);
		switch(nRet)
		{
		case IDCANCEL:
			return;
		case IDYES:
			OnSaveinfo();
			break;
		case IDNO:
		default:
			break;
		}
	}
	m_editUserName.EnableWindow();
	m_editOld.EnableWindow();
	m_buttonSelectPhoto.EnableWindow();
	m_buttonDeleteUser.EnableWindow(FALSE);
	m_Old = "";
	m_UserName = "";
	m_bModify = FALSE;