readexceldlg.cpp

数据类型转换

// readexcelDlg.cpp : implementation file
//

#include "stdafx.h"
#include "readexcel.h"
#include "readexcelDlg.h"
#include "afxdb.h"
#include <odbcinst.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()

/////////////////////////////////////////////////////////////////////////////
// CReadexcelDlg dialog

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

BEGIN_MESSAGE_MAP(CReadexcelDlg, CDialog)
	//{{AFX_MSG_MAP(CReadexcelDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CReadexcelDlg message handlers

BOOL CReadexcelDlg::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 CReadexcelDlg::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 CReadexcelDlg::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 CReadexcelDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

CString CReadexcelDlg::GetExcelDriver()
{

	char  szBuf[2001];
	WORD cbBufMax=2000;
	WORD cbBufOut;
	char *pszBuf=szBuf;
	CString sDriver;

	if(!SQLGetInstalledDrivers(szBuf,cbBufMax,&cbBufOut))
		return"";
	do
	{
	 if(strstr(pszBuf,"Excel")!=0)
	 {
		 sDriver=CString(pszBuf);
	     break;
	 } 
	pszBuf=strchr(pszBuf,'\0')+1;
	}
	while(pszBuf[1]!='\0');
	return sDriver;
}
 

void CReadexcelDlg::OnButton1() 
{
	// TODO: Add your control notification handler code here

	CDatabase database;
	CString sSql;
	CString sItem1, sItem2;
	CString sDriver;
	CString sDsn;
	CListBox m_ctrlList;
	CString sFile="readexcel.xls";
	m_ctrlList.ResetContent();
    sDriver=GetExcelDriver();
	if(sDriver.IsEmpty())
	{
	AfxMessageBox("No Excel ODBC driver found");
	return;
	}
sDsn.Format("ODBC;DRIVER={%s};DSN='';DBQ=%s",sDriver,sFile);

TRY
{
  database.Open(NULL,false,false,sDsn);
  CRecordset recset(&database);
  //sSql="SELECT field_1, field_2"
	  sSql="SELECT field_1"
	   "FROM demo_table"
	   "ORDER BY field_1";
  recset.Open(CRecordset::forwardOnly,sSql,CRecordset::readOnly);
  while(!recset.IsEOF())
  {
  recset.GetFieldValue("field_1",sItem1);
 // recset.GetFieldValue("field_2",sItem2);
  m_ctrlList.AddString(sItem1+"->"+sItem2);
  recset.MoveNext();
  }
database.Close();
}

CATCH(CDBException,e)
{
AfxMessageBox("Database error:"+e->m_strError);
}
END_CATCH;
}