ActiveX/DCOM/ATL

开发平台：
Visual C++

DemoBlobInsertDlg.cpp：源码内容
							// DemoBlobInsertDlg.cpp : implementation file
//
#include "stdafx.h"
#include "DemoBlobInsert.h"
#include "DemoBlobInsertDlg.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()
/////////////////////////////////////////////////////////////////////////////
// CDemoBlobInsertDlg dialog
CDemoBlobInsertDlg::CDemoBlobInsertDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CDemoBlobInsertDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CDemoBlobInsertDlg)
		// 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 CDemoBlobInsertDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CDemoBlobInsertDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CDemoBlobInsertDlg, CDialog)
	//{{AFX_MSG_MAP(CDemoBlobInsertDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CDemoBlobInsertDlg message handlers
BOOL CDemoBlobInsertDlg::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
	::CoInitialize(NULL);
	return TRUE;  // return TRUE  unless you set the focus to a control
}
void CDemoBlobInsertDlg::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 CDemoBlobInsertDlg::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 CDemoBlobInsertDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}
void CDemoBlobInsertDlg::OnButton1() 
{
	// TODO: Add your control notification handler code here
	CString strPath="c:\source.bmp";//读取图片路径
	_ConnectionPtr conn;//连接数据库智能指针
	conn.CreateInstance(__uuidof(Connection));//生成连接实例
	//打开的数据源
	conn->Open(_bstr_t("Provider=OraOLEDB.Oracle.1;User Id=scott;Data Source=abc"),_bstr_t(""),_bstr_t("tiger"),-1);
	_RecordsetPtr rs;//对应查询结果的链表
	rs.CreateInstance(__uuidof(Recordset));//生成查询实例
	//查询字句及打开方式
	rs->Open(_variant_t("select * from MyIMGBooks"),
		conn.GetInterfacePtr(),
		adOpenDynamic,
		adLockPessimistic,
		adCmdText);
	rs->AddNew();
	//首先插入非BLOB字段；
	rs->Fields->GetItem(_variant_t("BookISNB"))->Value=_variant_t((long)123);
	rs->Fields->GetItem(_variant_t("BookName"))->Value=_variant_t("adsf");
	rs->Fields->GetItem(_variant_t("BookAuthor"))->Value=_variant_t("adsf");
	//插入BLOB字段；
	int iBufferSize=1024*200;//一次读取内存200K个字节
	BYTE* pBuffer=new BYTE[iBufferSize];//连续的字节内存空间
	SAFEARRAYBOUND bd[1];//设定安全数组边界
	bd[0].cElements=iBufferSize;//安全数组最大下标200K
	bd[0].lLbound=0;
	//创建字节、1维、指定边界的安全数组
	SAFEARRAY* pArray=SafeArrayCreate(VT_UI1,1,bd);
	//打开文件
	 CFile fsource;
	 CFileException ex;//异常保存
	 fsource.Open(strPath,CFile::modeRead,&ex);
	 int iReaded=0;
	 do 
	 {//获取连续字节内存的首地址
		BYTE* pTemp=pBuffer;
		//以指定大小200K读取图片到连续内存中，iReaded为读到数据的实际大小(最后一次不一定是200K)
		iReaded=fsource.Read(pBuffer,iBufferSize);
		//修改BUG；如果iReaded最后一次不是200K就要出现指定符合iReaded大小边界的安全数组
		if(iReaded!=iBufferSize)
		{
			SafeArrayDestroy(pArray);//清空之前的安全数组
			pArray=NULL;
			SAFEARRAYBOUND bd1[1];
			bd1[0].cElements=iReaded;//指定符合iReaded大小边界的安全数组
			bd1[0].lLbound=0;
			pArray=SafeArrayCreate(VT_UI1,1,bd1);
		}
		for(long i=0;i<iReaded;i++)
		{//把连续内存中的二进制数据复制到安全数组中去
			SafeArrayPutElement(pArray,&i,pTemp++);
		}
		VARIANT mydata;//智能型数据
		mydata.vt=VT_ARRAY|VT_UI1;//数组及字节类型
		mydata.parray=pArray;//获取(保存图片二进制数据)安全数组入口
		//根据属性名索引把mydata中的图片二进制数据上传(追加)到数据库
		rs->Fields->GetItem("BookImage")->AppendChunk(mydata);
	 } while (iReaded==iBufferSize);
	//更新数据库
	 rs->Update();
	 rs->Close();
	 conn->Close();
	 MessageBox("ok");
}
void CDemoBlobInsertDlg::OnButton2() 
{
	// TODO: Add your control notification handler code here
	CString strPath="c:\source_bak.bmp";
	_ConnectionPtr conn;
	conn.CreateInstance(__uuidof(Connection));
	conn->Open(_bstr_t("Provider=OraOLEDB.Oracle.1;User Id=scott;Data Source=abc"),_bstr_t(""),_bstr_t("tiger"),-1);
	_RecordsetPtr rs;
	rs.CreateInstance(__uuidof(Recordset));
	rs->Open(_variant_t("select * from MyIMGBooks where Bookisnb=124"),
		conn.GetInterfacePtr(),
		adOpenDynamic,
		adLockPessimistic,
		adCmdText);
	CFile fTarget;
	CFileException ex;
	fTarget.Open(strPath,CFile::modeCreate|CFile::modeWrite,&ex);
	int iBufferSize=1024*100;
	_variant_t vt;
	int iReaded=0;
	
	if(!rs->adEOF)
	{
		long iAllSize=rs->GetFields()->GetItem(_bstr_t("BookImage"))->ActualSize;
		int iReadedAll=0;
 		do{		
 		BYTE* pBuf=NULL;
 		vt=rs->GetFields()->GetItem(_bstr_t("BookImage"))->GetChunk(1024*100);
 		iReaded=vt.parray->rgsabound->cElements;
 		SafeArrayAccessData(vt.parray,(void **)&pBuf);
 		fTarget.Write(pBuf,iReaded);
 		fTarget.Flush();
 		SafeArrayUnaccessData(vt.parray);
		iReadedAll+=iReaded;
 		}while(iReadedAll<iAllSize);
	}	
	rs->Close();
	conn->Close();
	fTarget.Close();
	MessageBox("ok!");
}

						