dsntestdlg.cpp

枚举DNS数据源.可以用来获得计算机中所有的DNS数据源.本例主要利用CDSNCollection类.

// DSNTestDlg.cpp : implementation file
//

#include "stdafx.h"
#include "DSNTest.h"
#include "DSNTestDlg.h"

#include "DSNCollection.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CDSNTestDlg dialog

CDSNTestDlg::CDSNTestDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CDSNTestDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CDSNTestDlg)
	m_bSystem = TRUE;
	m_bUser = FALSE;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CDSNTestDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CDSNTestDlg)
	DDX_Control(pDX, IDC_DSN_LIST, m_ctrlDSNList);
	DDX_Check(pDX, IDC_SYSTEM, m_bSystem);
	DDX_Check(pDX, IDC_USER, m_bUser);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CDSNTestDlg, CDialog)
	//{{AFX_MSG_MAP(CDSNTestDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDSNTestDlg message handlers

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

	// 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
	bool bOk = InitDSNListBox();
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

// 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 CDSNTestDlg::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 CDSNTestDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

bool CDSNTestDlg::InitDSNListBox()
{
	UpdateData(TRUE);
	m_ctrlDSNList.ResetContent();

	CDSNCollection dsn;

	for (bool bFirst = true; dsn.GetLastSQLResult() == SQL_SUCCESS; bFirst = false)
	{
		CString s;
		if (bFirst)
			s = dsn.GetFirstDSNName((m_bSystem?CDSNCollection::s_SYSTEM:0) |
									(m_bUser?CDSNCollection::s_USER:0));
		else
			s = dsn.GetNextDSNName();

		if (dsn.GetLastSQLResult() == SQL_SUCCESS)
			m_ctrlDSNList.AddString(s);
	}

	if (dsn.GetLastSQLResult() != SQL_NO_DATA)
		MessageBox(dsn.GetErrorMessage());

	return true;
}

void CDSNTestDlg::OnOK() 
{
	if (IDYES == MessageBox("Do you want to refresh the DSN list?","Update?",MB_YESNO|MB_ICONQUESTION))
	{
		InitDSNListBox();
		return;
	}

	MessageBox("Author:\tEmil Gustafsson\n\tNTier Solutions\n\twww.ntier.se",
		       "About this Demo:",
			   MB_OK|MB_ICONINFORMATION);
	
	CDialog::OnOK();
}