treedata.cpp

有关树型控件的例子,是VC的对话框中实现从数据库中读取记录的实例

// TreeData.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include "TreeData.h"
#include "TreeDataDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CTreeDataApp

BEGIN_MESSAGE_MAP(CTreeDataApp, CWinApp)
	//{{AFX_MSG_MAP(CTreeDataApp)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG
	ON_COMMAND(ID_HELP, CWinApp::OnHelp)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CTreeDataApp construction

CTreeDataApp::CTreeDataApp()
{
	// TODO: add construction code here,
	// Place all significant initialization in InitInstance
	//-------------------------------------------------------
    TreeConnString=_T("Provider=Microsoft.Jet.OLEDB.4.0;")
        _T("Data Source=DataBase\\City.mdb;");
	//-------------------------------------------------------
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CTreeDataApp object

CTreeDataApp theApp;

/////////////////////////////////////////////////////////////////////////////
// CTreeDataApp initialization

BOOL CTreeDataApp::InitInstance()
{
	AfxEnableControlContainer();
//-------COM初始化--------------------------------
	AfxOleInit();
	/******************连接通讯录数据库********************/
    HRESULT hRes;
	try
	{
        hRes=m_pTreeConn.CreateInstance(_T("ADODB.Connection"));
		m_pTreeConn->ConnectionTimeout = 8;
		//连接ACCESS2000
		hRes=m_pTreeConn->Open(_bstr_t((LPCTSTR) TreeConnString),
            _T(""),_T(""),adModeUnknown);
	}
	catch(_com_error e)///捕捉异常
	{
		 CString errormessage;
		 errormessage.Format(_T("连接City.mdb数据库失败!\r\n错误信息:%s"),e.ErrorMessage());
		 AfxMessageBox(errormessage);///显示错误信息
         return FALSE;
	} 

//------------------------------------------------
	// Standard initialization
	// If you are not using these features and wish to reduce the size
	//  of your final executable, you should remove from the following
	//  the specific initialization routines you do not need.

#ifdef _AFXDLL
	Enable3dControls();			// Call this when using MFC in a shared DLL
#else
	Enable3dControlsStatic();	// Call this when linking to MFC statically
#endif

	CTreeDataDlg dlg;
	m_pMainWnd = &dlg;
	int nResponse = dlg.DoModal();
	if (nResponse == IDOK)
	{
		// TODO: Place code here to handle when the dialog is
		//  dismissed with OK
	}
	else if (nResponse == IDCANCEL)
	{
		// TODO: Place code here to handle when the dialog is
		//  dismissed with Cancel
	}

	// Since the dialog has been closed, return FALSE so that we exit the
	//  application, rather than start the application's message pump.
	return FALSE;
}