ex01bdlg.cpp

VC++采用ODBC技术读取XLS文件,具体的函数说明参考MSDN.

// ex01bDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ex01b.h"
#include "ex01bDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CEx01bDlg dialog

CEx01bDlg::CEx01bDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CEx01bDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CEx01bDlg)
		// 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 CEx01bDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CEx01bDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CEx01bDlg, CDialog)
	//{{AFX_MSG_MAP(CEx01bDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_READ, OnRead)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEx01bDlg message handlers

BOOL CEx01bDlg::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
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CEx01bDlg::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 CEx01bDlg::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 CEx01bDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}
///////////////////////////////////////////////////
// 工作表访问
///////////////////////////////////////////////////

void CEx01bDlg::OnReadexcel() 
{
	CDatabase database;
    CString sSql;
    CString sItem[7];
	CString sDriver;
    CString sDsn;
    CString sFile,sPath;

	CDBVariant tempVari;
	

	//获取主程序所在路径,存在sPath中
	GetModuleFileName(NULL,sPath.GetBufferSetLength (MAX_PATH+1),MAX_PATH);
	sPath.ReleaseBuffer ();
    int nPos;
	nPos=sPath.ReverseFind ('\\');
	sPath=sPath.Left (nPos);

	sFile = sPath + "\\table.xls"; 			// 将被读取的Excel文件名

    // 检索是否安装有Excel驱动 "Microsoft Excel Driver (*.xls)" 
    sDriver = GetExcelDriver();
    if (sDriver.IsEmpty())
    {
        // 没有发现Excel驱动
        AfxMessageBox("没有安装Excel驱动!");
        return;
    }
    
    // 创建进行存取的字符串
    sDsn.Format("ODBC;DRIVER={%s};DSN='';DBQ=%s", sDriver, sFile);

    TRY
    {
        // 打开数据库(即Excel文件)
        database.Open(NULL, false, false, sDsn);
        
        CRecordset recset(&database);

        // 设置读取的查询语句.
        sSql = "SELECT 学号, 姓名, 性别,出生日期,籍贯,入学日期,英语成绩 "
               "FROM demotable " ;                
               "ORDER BY 学号 ";
    
        // 执行查询语句
        recset.Open(CRecordset::forwardOnly, sSql, CRecordset::readOnly);

        // 获取查询结果
        while (!recset.IsEOF())
        {
            //读取Excel内部数值
            recset.GetFieldValue("学号", tempVari ,SQL_C_SLONG);
			sItem[0].Format("%6d",tempVari.m_lVal);
			recset.GetFieldValue("姓名", sItem[1]);
			if(sItem[1].GetLength()==4) sItem[1]+="  ";
            recset.GetFieldValue("性别", sItem[2]);
			recset.GetFieldValue("出生日期", tempVari,SQL_C_TIMESTAMP);
			sItem[3].Format("%4d年%2d月%2d日",tempVari.m_pdate->year,tempVari.m_pdate->month,tempVari.m_pdate->day);
			recset.GetFieldValue("籍贯", sItem[4]);
			recset.GetFieldValue("入学日期", tempVari,SQL_C_TIMESTAMP);
			sItem[5].Format("%4d年%2d月%2d日",tempVari.m_pdate->year,tempVari.m_pdate->month,tempVari.m_pdate->day);
			recset.GetFieldValue("英语成绩",tempVari,SQL_C_SSHORT);
			sItem[6].Format("%3d",tempVari.m_iVal);
			

			//显示记取的内容
			((CListBox*)GetDlgItem(IDC_LIST1))->AddString(sItem[0]+"  "+sItem[1]+"  "+sItem[2]+"  "+sItem[3]+"  "+sItem[4]+"  "+sItem[5]+"  "+sItem[6]);

            // 移到下一行
            recset.MoveNext();
        }

        // 关闭数据库
        database.Close();
                             
    }
    CATCH(CDBException, e)
    {
        // 数据库操作产生异常时...
        AfxMessageBox("数据库错误: " + e->m_strError);
    }
    END_CATCH;

	
}

//////////////////////////////////////////////////////////////////////////////
//获取ODBC中Excel驱动
/////////////////////////////////////////////////////////////////////////////
CString CEx01bDlg::GetExcelDriver()
{
    char szBuf[2001];
    WORD cbBufMax = 2000;
    WORD cbBufOut;
    char *pszBuf = szBuf;
    CString sDriver;

    // 获取已安装驱动的名称(函数在odbcinst.h里)
    if (!SQLGetInstalledDrivers(szBuf, cbBufMax, &cbBufOut))
        return "";				
    // 检索已安装的驱动是否有Excel...
    do
    {
        if (strstr(pszBuf, "Excel") != 0)
        {
            //发现 !
            sDriver = CString(pszBuf);
            break;
        }
        pszBuf = strchr(pszBuf, '\0') + 1;
    }
    while (pszBuf[1] != '\0');

    return sDriver;
}


///////////////////////////////////////////////////////////////////
// 消息响应
///////////////////////////////////////////////////////////////////

void CEx01bDlg::OnRead() 
{
	((CListBox*)GetDlgItem(IDC_LIST1))->ResetContent();
	OnReadexcel();
}