testdlg.cpp

VC++编写的读取数据库字段的程序,请多指教!

// TestDlg.cpp : 实现文件
//

#include "stdafx.h"
#include "Test.h"
#include "TestDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// 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()


// CTestDlg 对话框



CTestDlg::CTestDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CTestDlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	m_DBSet.Open();
}

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

BEGIN_MESSAGE_MAP(CTestDlg, CDialog)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
	ON_BN_CLICKED(IDC_BTNFIRST, OnBnClickedBtnfirst)
	ON_BN_CLICKED(IDC_BTNPRE, OnBnClickedBtnpre)
	ON_BN_CLICKED(IDC_BTNNEXT, OnBnClickedBtnnext)
	ON_BN_CLICKED(IDC_BTNEND, OnBnClickedBtnend)
END_MESSAGE_MAP()


// CTestDlg 消息处理程序

BOOL CTestDlg::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

	this->OnBnClickedBtnfirst();
	
	return TRUE;  // 除非设置了控件的焦点，否则返回 TRUE
}

void CTestDlg::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 CTestDlg::OnPaint() 
{
	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
	{
		CPaintDC dc(this);
		if (!(m_DBPicture.m_hObject == NULL))
		{
			//创建内存设备场景
			CDC dcMem; 
			dcMem.CreateCompatibleDC( &dc ); 
			CBitmap*  pBmpOld ;
			BITMAP  BmpSize ; 
			m_DBPicture.GetBitmap(&BmpSize); 
			pBmpOld = dcMem.SelectObject(&m_DBPicture);
			//显示位图
			dc.StretchBlt( 5,5, BmpSize.bmWidth+5, BmpSize.bmHeight+5, &dcMem, 0, 0, BmpSize.bmWidth, BmpSize.bmHeight, SRCCOPY);
			dcMem.SelectObject( pBmpOld );
		}
		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 CTestDlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}
void CTestDlg::OnBnClickedBtnfirst()
{
	m_DBSet.MoveFirst();
	this->ShowDBRecord();	
}
void CTestDlg::OnBnClickedBtnpre()
{
	m_DBSet.MovePrev();
	if(m_DBSet.IsBOF())
		return;
	this->ShowDBRecord();
}
void CTestDlg::OnBnClickedBtnnext()
{
	m_DBSet.MoveNext();
	if(m_DBSet.IsEOF())
		return;
	this->ShowDBRecord();
}
void CTestDlg::OnBnClickedBtnend()
{
	m_DBSet.MoveLast();	
	this->ShowDBRecord();
}
void CTestDlg::ShowDBRecord(void)
{
	CString strEID;
	strEID.Format("%d",m_DBSet.m_ID);
	SetDlgItemText(IDC_EID,strEID);
	SetDlgItemText(IDC_NAME,m_DBSet.m_Name);
	CByteArray Array;
	Array.Copy(m_DBSet.m_Picture); 	
	while(1)
	{
	int HeaderLen = 1; 
	Array.RemoveAt( 0, HeaderLen ); 
    BITMAPINFOHEADER &bmiHeader = *(LPBITMAPINFOHEADER)
		Array.GetData() ;
	//24色位图，根据需要设定为4，8，16等格式位图
	if(bmiHeader.biBitCount==24)
		break;
	}
	BITMAPINFOHEADER &bmiHeader = *(LPBITMAPINFOHEADER)
		Array.GetData() ;
    BITMAPINFO &bmInfo = *(LPBITMAPINFO)Array.GetData() ;
	
	//获得位图颜色数
    int nColors = bmiHeader.biClrUsed ?
		bmiHeader.biClrUsed : 1 << bmiHeader.biBitCount;

	//获得位图数据
    LPVOID lpDIBBits;
    if( bmInfo.bmiHeader.biBitCount > 8 )
       lpDIBBits = (LPVOID)((LPDWORD)(bmInfo.bmiColors 
	   + bmInfo.bmiHeader.biClrUsed) + 
       ((bmInfo.bmiHeader.biCompression == BI_BITFIELDS) ?
	   3 : 0));
     else
        lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);

     CClientDC dc(NULL);

	 //创建位图
	 HBITMAP hBmp = CreateDIBitmap( dc.m_hDC,   
			                    &bmiHeader,     
                                CBM_INIT,       
                                lpDIBBits,      
                                &bmInfo,        
                                DIB_RGB_COLORS);
    this->m_DBPicture.DeleteObject();
	this->m_DBPicture.Attach(hBmp);
	Array.RemoveAll();
	this->Invalidate();
}