adoimagedlg.cpp

Visual C++.Net中基于ADO的数据库图像输入方法

// ADOimageDlg.cpp : 实现文件
//

#include "stdafx.h"
#include "ADOimage.h"
#include "ADOimageDlg.h"
#include ".\adoimagedlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

extern CADOimageApp theApp;
// 用于应用程序“关于”菜单项的 CAboutDlg 对话框

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// 对话框数据
	enum { IDD = IDD_ABOUTBOX };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持

// 实现
protected:
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()


// CADOimageDlg 对话框



CADOimageDlg::CADOimageDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CADOimageDlg::IDD, pParent)
	, m_UserName(_T(""))
	, m_Old(_T(""))
	, m_Sex(_T(""))
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	m_bModify = FALSE;
	m_hPhotoBitmap = NULL;
	m_pBMPBuffer = NULL;

}

void CADOimageDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Control(pDX, IDC_USERNAME, m_editUserName);
	DDX_Text(pDX, IDC_USERNAME, m_UserName);
	DDX_Control(pDX, IDC_OLD, m_editOld);
	DDX_Text(pDX, IDC_OLD, m_Old);
	DDX_Control(pDX, IDC_SAVEINFO, m_buttonSaveInfo);
	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_SELECTPHOTO, m_buttonSelectPhoto);
	DDX_Control(pDX, IDC_SEX, m_editSex);
	DDX_Text(pDX, IDC_SEX, m_Sex);
}

BEGIN_MESSAGE_MAP(CADOimageDlg, CDialog)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
	ON_BN_CLICKED(IDC_ADDUSER, OnBnClickedAdduser)
	ON_BN_CLICKED(IDC_SAVEINFO, OnBnClickedSaveinfo)
	ON_BN_CLICKED(IDC_SELECTPHOTO, OnBnClickedSelectphoto)
	ON_BN_CLICKED(IDC_NEXTUSER, OnBnClickedNextuser)
	ON_BN_CLICKED(IDC_PREVIOUSUSER, OnBnClickedPrevioususer)
	ON_BN_CLICKED(IDC_DELETEUSER, OnBnClickedDeleteuser)
	ON_EN_CHANGE(IDC_USERNAME, OnEnChangeUsername)
	ON_EN_CHANGE(IDC_SEX, OnEnChangeSex)
	ON_EN_CHANGE(IDC_OLD, OnEnChangeOld)
END_MESSAGE_MAP()


// CADOimageDlg 消息处理程序

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

	// 将\“关于...\”菜单项添加到系统菜单中。

	// IDM_ABOUTBOX 必须在系统命令范围内。
	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);
		}
	}

	// 设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动
	//  执行此操作
	SetIcon(m_hIcon, TRUE);			// 设置大图标
	SetIcon(m_hIcon, FALSE);		// 设置小图标

	// TODO: 在此添加额外的初始化代码

	m_bNewUser = FALSE;
	m_pRecordset.CreateInstance("ADODB.Recordset");
	HRESULT hr = m_pRecordset->Open("SELECT * FROM Persons",_variant_t((IDispatch *)theApp.m_pConnection,true),adOpenDynamic,adLockPessimistic,adCmdText);
    if(SUCCEEDED(hr))
	{
		ReadData();
	}
	ResetControls();
	
	return TRUE;  // 除非设置了控件的焦点，否则返回 TRUE
}

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

// 如果向对话框添加最小化按钮，则需要下面的代码
//  来绘制该图标。对于使用文档/视图模型的 MFC 应用程序，
//  这将由框架自动完成。

void CADOimageDlg::OnPaint() 
{
	CPaintDC dc(this);
	if (IsIconic())
	{
		CPaintDC dc(this); // 用于绘制的设备上下文

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// 使图标在工作矩形中居中
		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;

		// 绘制图标
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		DrawUserPhoto(50,30,&dc);//显示照片
		CDialog::OnPaint();
	}
}

//当用户拖动最小化窗口时系统调用此函数取得光标显示。
HCURSOR CADOimageDlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}


/////////////////在屏幕上显示图像///////////////////
void CADOimageDlg::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,120,120,&MemDC,0,0,SRCCOPY);//不伸缩
//	pDC->StretchBlt(x,y,120,120,&MemDC,0,0,200,240,SRCCOPY);
	MemDC.SelectObject(OldBitmap);
}

////读取记录集当前记录中数据，包括图像数据 
void CADOimageDlg::ReadData(void)
{
	DestroyPhoto();						///清除原图像
	if(m_pRecordset->adoEOF||m_pRecordset->BOF) 
	{
		m_UserName.Empty();
		m_Old.Empty();
		m_Sex.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("name").bstrVal;
	m_Sex = m_pRecordset->GetCollect("sex").bstrVal;
	m_Old.Format("%d",m_pRecordset->GetCollect("age").lVal);
	m_editUserName.EnableWindow();
	m_editOld.EnableWindow();
	m_editSex.EnableWindow();
	m_buttonSelectPhoto.EnableWindow();
	m_buttonDeleteUser.EnableWindow();
	UpdateData(FALSE);

}

void CADOimageDlg::ResetControls(void)
{
	BOOL IsFirstRecord = FirstRecord();
	BOOL IsLastRecord = LastRecord();
	m_buttonPreviousUser.EnableWindow(!IsFirstRecord);
	m_buttonNextUser.EnableWindow(!IsLastRecord);
}

/////////////清除分配的对象/////////////
void CADOimageDlg::DestroyPhoto(void)
{
	if(m_hPhotoBitmap)
	{
		DeleteObject(m_hPhotoBitmap);
		m_hPhotoBitmap = NULL;
	}
	if(m_pBMPBuffer)
	{
		delete m_pBMPBuffer;
		m_pBMPBuffer = NULL;
	}
}

/////////////加载BMP文件到内存//////////////
BOOL CADOimageDlg::LoadBMPFile(const char *pBMPPathname)
{
	CFile file;
	if( !file.Open( pBMPPathname, CFile::modeRead) )
		return FALSE;
	m_nFileLen = (DWORD)file.GetLength();
	m_pBMPBuffer = new char[m_nFileLen + 1];
	if(!m_pBMPBuffer)
		return FALSE;
	if(file.Read(m_pBMPBuffer,m_nFileLen) != m_nFileLen)
		return FALSE;
	return TRUE;
}

///////////将内存中的BMP文件内容转换到HBITMAP///////
HBITMAP CADOimageDlg::BufferToHBITMAP()
{
	HBITMAP				hBmp;
	LPSTR				hDIB,lpBuffer = m_pBMPBuffer;
	LPVOID				lpDIBBits;
	BITMAPFILEHEADER	bmfHeader;
	DWORD				bmfHeaderLen;

	bmfHeaderLen = sizeof(bmfHeader);
	strncpy((LPSTR)&bmfHeader,(LPSTR)lpBuffer,bmfHeaderLen);
	if (bmfHeader.bfType != (*(WORD*)"BM")) return NULL; 
	hDIB = lpBuffer + bmfHeaderLen;
	BITMAPINFOHEADER &bmiHeader = *(LPBITMAPINFOHEADER)hDIB ;
	BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
	lpDIBBits=(lpBuffer)+((BITMAPFILEHEADER *)lpBuffer)->bfOffBits;//这行功能和上面被注释掉的代码相同，容易理解。
	CClientDC dc(this);
	hBmp = CreateDIBitmap(dc.m_hDC,&bmiHeader,CBM_INIT,lpDIBBits,&bmInfo,DIB_RGB_COLORS);
	return hBmp;
}

////////////////判断是否是最后一个记录//////////////
BOOL CADOimageDlg::LastRecord()
{
	if(m_pRecordset->adoEOF)
	{
		m_editUserName.EnableWindow(FALSE);
		m_editOld.EnableWindow(FALSE);
		m_editSex.EnableWindow(FALSE);
		m_buttonSelectPhoto.EnableWindow(FALSE);
		return TRUE;
	}
	m_pRecordset->MoveNext();
	if(m_pRecordset->adoEOF)
	{
		m_pRecordset->MovePrevious();
		return TRUE;
	}
	else
	{
		m_pRecordset->MovePrevious();
		return FALSE;
	}

}

////////////////判断是否是第一个记录////////////////
BOOL CADOimageDlg::FirstRecord()
{
	if(m_pRecordset->BOF)
	{
		m_editUserName.EnableWindow(FALSE);
		m_editOld.EnableWindow(FALSE);
		m_editSex.EnableWindow(FALSE);
		m_buttonSelectPhoto.EnableWindow(FALSE);
		return TRUE;
	}
	m_pRecordset->MovePrevious();
	if(m_pRecordset->BOF)
	{
		m_pRecordset->MoveFirst();
		return TRUE;
	}
	else
	{
		m_pRecordset->MoveNext();
		return FALSE;
	}
}


void CADOimageDlg::OnBnClickedAdduser()
{
	// TODO: 在此添加控件通知处理程序代码
	if(m_bModify)
	{
		int nRet = MessageBox("当前人员信息尚未保存，是否保存?","提示",MB_YESNOCANCEL);
		switch(nRet)
		{
		case IDCANCEL:
			return;
		case IDYES:
			OnBnClickedSaveinfo();
			break;
		case IDNO:
		default:
			break;
		}
	}
	m_editUserName.EnableWindow();
	m_editOld.EnableWindow();
	m_editSex.EnableWindow();
	m_buttonSelectPhoto.EnableWindow();
	m_buttonDeleteUser.EnableWindow(FALSE);
	m_Old = "";
	m_UserName = "";
	m_Sex="";
	m_bModify = FALSE;
	m_bNewUser = TRUE;
	UpdateData(FALSE);
	DestroyPhoto();
	Invalidate();

}

////////////////保存人员信息/////////////////
void CADOimageDlg::OnBnClickedSaveinfo()
{
	// TODO: 在此添加控件通知处理程序代码
	if(!m_bModify) return;
	UpdateData();
	if(m_pBMPBuffer == NULL || m_hPhotoBitmap == NULL || m_UserName == "" || m_Old == "")
	{
		AfxMessageBox("您没有提供完整的人员信息。\r\n这些信息包括:人名、性别、年龄、照片");
		return;
	}
	m_buttonSaveInfo.EnableWindow(FALSE);
	char			*pBuf = m_pBMPBuffer;
	VARIANT			varBLOB;
	SAFEARRAY		*psa;
    SAFEARRAYBOUND	rgsabound[1];

	if(m_bNewUser)
		m_pRecordset->AddNew();
 
	m_pRecordset->PutCollect("name",_variant_t(m_UserName));
	m_pRecordset->PutCollect("sex",_variant_t(m_Sex));
	m_pRecordset->PutCollect("age",atol(m_Old));


	if(pBuf)
	{    
		rgsabound[0].lLbound = 0;
		rgsabound[0].cElements = m_nFileLen;
		psa = SafeArrayCreate(VT_UI1, 1, rgsabound);
		for (long i = 0; i < (long)m_nFileLen; i++)
			SafeArrayPutElement (psa, &i, pBuf++);
		varBLOB.vt = VT_ARRAY | VT_UI1;
		varBLOB.parray = psa;
		m_pRecordset->GetFields()->GetItem("photo")->AppendChunk(varBLOB);
	}

	m_pRecordset->Update();
	m_buttonDeleteUser.EnableWindow();
	ResetControls();
	m_bNewUser = FALSE;
	m_bModify = FALSE;

}

///////////选择BMP文件并加载到内存/////////////
void CADOimageDlg::OnBnClickedSelectphoto()
{
	// TODO: 在此添加控件通知处理程序代码
	static char BASED_CODE szFilter[] = "BMP Files (*.bmp)|*.bmp|All Files (*.*)|*.*||";
	CFileDialog dlg(TRUE,"BMP",NULL,  OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,szFilter);
	if(dlg.DoModal() == IDOK)
	{
		CString pathname = dlg.GetPathName();
		DestroyPhoto();
		LoadBMPFile(pathname);
		m_hPhotoBitmap = BufferToHBITMAP();
		m_bModify = TRUE;
		m_buttonSaveInfo.EnableWindow();
		Invalidate();
	}
}

//////////////下一个用户信息///////////////
void CADOimageDlg::OnBnClickedNextuser()
{
	// TODO: 在此添加控件通知处理程序代码
 
	if(m_bModify)///假如当前记录改动过，则保存
		OnBnClickedSaveinfo();
	m_pRecordset->MoveNext();
	if(m_pRecordset->adoEOF)
		m_pRecordset->MoveLast();
	ReadData();
	ResetControls();
	Invalidate();
}

/////////////上一个用户信息/////////////////
void CADOimageDlg::OnBnClickedPrevioususer()
{
	// TODO: 在此添加控件通知处理程序代码
	if(m_bModify)///假如当前记录改动过，则保存
		OnBnClickedSaveinfo();
	m_pRecordset->MovePrevious();
	if(m_pRecordset->BOF)
		m_pRecordset->MoveFirst();
	ReadData();
	ResetControls();
	Invalidate();

}

//////////////删除用户//////////////
void CADOimageDlg::OnBnClickedDeleteuser()
{
	// TODO: 在此添加控件通知处理程序代码
 
	m_pRecordset->Delete(adAffectCurrent);
	if(m_pRecordset->adoEOF)
		m_pRecordset->MoveLast();
	ResetControls();
	m_buttonDeleteUser.EnableWindow(FALSE);
	ReadData();
	Invalidate();
}

void CADOimageDlg::OnEnChangeUsername()
{
	// TODO:  如果该控件是 RICHEDIT 控件，则它将不会
	// 发送该通知，除非重写 CDialog::OnInitDialog()
	// 函数并调用 CRichEditCtrl().SetEventMask()，
	// 同时将 ENM_CHANGE 标志“或”运算到掩码中。

	// TODO:  在此添加控件通知处理程序代码
	m_bModify = TRUE;
}

void CADOimageDlg::OnEnChangeSex()
{
	// TODO:  如果该控件是 RICHEDIT 控件，则它将不会
	// 发送该通知，除非重写 CDialog::OnInitDialog()
	// 函数并调用 CRichEditCtrl().SetEventMask()，
	// 同时将 ENM_CHANGE 标志“或”运算到掩码中。

	// TODO:  在此添加控件通知处理程序代码
	m_bModify = TRUE;
}

void CADOimageDlg::OnEnChangeOld()
{
	// TODO:  如果该控件是 RICHEDIT 控件，则它将不会
	// 发送该通知，除非重写 CDialog::OnInitDialog()
	// 函数并调用 CRichEditCtrl().SetEventMask()，
	// 同时将 ENM_CHANGE 标志“或”运算到掩码中。

	// TODO:  在此添加控件通知处理程序代码
	m_bModify = TRUE;
}