onedlg.cpp

利用MFC把jpg图片存入ACCSEE数据库中

// oneDlg.cpp : implementation file
//

#include "stdafx.h"
#include "one.h"
#include "oneDlg.h"
#include "Picture.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
extern COneApp theApp;//james???
/////////////////////////////////////////////////////////////////////////////
// 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()

/////////////////////////////////////////////////////////////////////////////
// COneDlg dialog

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

BEGIN_MESSAGE_MAP(COneDlg, CDialog)
	//{{AFX_MSG_MAP(COneDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
	ON_BN_CLICKED(IDC_BUTTON3, OnButton3)
	ON_BN_CLICKED(IDC_BUTTON4, OnButton4)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// COneDlg message handlers

BOOL COneDlg::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
	//----------------------------------------------------
	try
	{
		m_pRecordset.CreateInstance("ADODB.Recordset");
		m_pRecordset->Open("SELECT * FROM jlab ORDER BY id",_variant_t((IDispatch*)theApp.m_pConnection,true),adOpenStatic,adLockOptimistic,adCmdText);
	}

	catch(_com_error e)///捕捉异常
	{
		AfxMessageBox("读取数据库失败!");///显示错误信息
	}
	//-----------------------------------------------------



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

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

void COneDlg::OnButton1()   //-----------jpg存入库并显示-------------
{
// TODO: Add your control notification handler code here
	  CFile f;
	  CString  FilePathName;
	  CFileException e;

      CFileDialog dlg(TRUE,NULL,NULL,0,"jpg Files (*.jpg)|*.jpg||",this);///TRUE为OPEN对话框，FALSE为SAVE AS对话框
      if(dlg.DoModal()==IDOK)
      {FilePathName=dlg.GetPathName();

	if(m_Pic.m_IPicture != NULL) m_Pic.FreePictureData(); // Important - Avoid Leaks...

	if(f.Open(FilePathName, CFile::modeRead | CFile::typeBinary, &e)) //打开了一个jpg文件
{	

		int nSize = f.GetLength();          //先得到jpg文件长度
		BYTE * pBuffer = new BYTE [nSize];  //按文件的大小在堆上申请一块内存
	 
		if (f.Read(pBuffer, nSize) > 0 )    //把jpg文件读到pBuffer(堆上申请一块内存)
		{   // +----------------------------------------------
						BYTE *pBuf = pBuffer;     ///下面这一大段是把pBuffer里的jpg数据放到库中
						VARIANT			varBLOB;
						SAFEARRAY		*psa;
					    SAFEARRAYBOUND	rgsabound[1];
				
						m_pRecordset->AddNew();  
							
						if(pBuf)
							{    
							rgsabound[0].lLbound = 0;
							rgsabound[0].cElements = nSize;
							psa = SafeArrayCreate(VT_UI1, 1, rgsabound);
							for (long i = 0; i < (long)nSize; i++)
							SafeArrayPutElement (psa, &i, pBuf++);
							varBLOB.vt = VT_ARRAY | VT_UI1;
							varBLOB.parray = psa;
							m_pRecordset->GetFields()->GetItem("j")->AppendChunk(varBLOB);
							}
						m_pRecordset->Update();
						
			// +----------------------------------------------


			(m_Pic.LoadPictureData(pBuffer, nSize));//接作调用函数读pBuffer的jpg数据准备显示
			delete [] pBuffer;     //删掉堆上申请的那一块内存
			pBuf=0;                //以防二次乱用
		}
		f.Close();
	
	

}
 
		CClientDC dc(this);        
		m_Pic.UpdateSizeOnDC(&dc); // Get Picture Dimentions In Pixels
		m_Pic.Show(&dc, CRect(200,0,200+m_Pic.m_Width,m_Pic.m_Height) );//显示出来看看
		
		
	  }	
	  
	
	
}

void COneDlg::OnButton2()   //----------------从库中提取并显示------------
{
	try
	{
		long nSize = m_pRecordset->GetFields()->GetItem("j")->ActualSize;
		if(nSize > 0)
		{
			_variant_t	varBLOB;
			varBLOB = m_pRecordset->GetFields()->GetItem("j")->GetChunk(nSize);
			if(varBLOB.vt == (VT_ARRAY | VT_UI1))
			{
				if(BYTE *pBuffer = new BYTE [nSize+1])		///重新申请必要的存储空间
				{	
					char *pBuf = NULL;
					SafeArrayAccessData(varBLOB.parray,(void **)&pBuf);
					memcpy(pBuffer,pBuf,nSize);				///复制数据到缓冲区m_pBMPBuffer
					SafeArrayUnaccessData (varBLOB.parray);
				//	int nSize = lDataSize;
					(m_Pic.LoadPictureData(pBuffer, nSize));

					 delete [] pBuffer;
					 pBuf=0;
					 
					 
					 ///生成BITMAP对象
					 CClientDC dc(this);
					 m_Pic.UpdateSizeOnDC(&dc); // Get Picture Dimentions In Pixels
					 m_Pic.Show(&dc, CRect(0,50,m_Pic.m_Width,50+m_Pic.m_Height) );
				}
			}
		}
	}
	catch (_com_error e) {
	}
		
}




void COneDlg::OnButton3() 
{
	try{
		m_pRecordset->MovePrevious();	//选上一个jpg
		OnButton2();
	}
	catch (_com_error e) {
	}
}



void COneDlg::OnButton4() 
{
	try{
		m_pRecordset->MoveNext();       //选下一个jpg
		OnButton2();
	}
	catch (_com_error e) {
	}	
}