studentdlg.cpp

Visual C++应用教程-源代码 本书在复习C++基础知识后

// StudentDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Student.h"
#include "StudentDlg.h"
#include "DrawDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CStudentDlg dialog

CStudentDlg::CStudentDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CStudentDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CStudentDlg)
		// 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 CStudentDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CStudentDlg)
	DDX_Control(pDX, IDC_COMBO1, m_ComboTable);
	DDX_Control(pDX, IDC_LIST1, m_ListCtrl);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CStudentDlg, CDialog)
	//{{AFX_MSG_MAP(CStudentDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_DESTROY()
	ON_CBN_SELCHANGE(IDC_COMBO1, OnSelchangeCombo1)
	ON_BN_CLICKED(IDC_BUTTON_STAT, OnButtonStat)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CStudentDlg message handlers

BOOL CStudentDlg::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
	m_ListCtrl.SetExtendedStyle(LVS_EX_FULLROWSELECT|LVS_EX_GRIDLINES);
	m_pConnection.CreateInstance(__uuidof(Connection)); 	// 初始化Connection指针
	m_pConnection->ConnectionString
		="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=..\\..\\student.mdb;"; 
		// 此句代码在一行书写
	m_pConnection->ConnectionTimeout = 30; 					// 允许连接超时时间，单位为秒
	HRESULT  hr = m_pConnection->Open("","","",0); 
	if (hr != S_OK) 
		MessageBox("无法连接指定的数据库！");

	m_ComboTable.AddString( "学生基本信息表" );
	m_ComboTable.AddString( "课程信息表" );
	m_ComboTable.AddString( "学生成绩表" );

	m_ComboTable.SetCurSel( 0 );
	OnSelchangeCombo1();
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CStudentDlg::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 CStudentDlg::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 CStudentDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CStudentDlg::OnDestroy() 
{
	CDialog::OnDestroy();
	
	// TODO: Add your message handler code here
	if (m_pConnection)
		m_pConnection->Close();// 关闭连接	
}

void CStudentDlg::DispAllRec(CString strSQL)
{
	m_ListCtrl.DeleteAllItems();
	int nColumnCount = m_ListCtrl.GetHeaderCtrl()->GetItemCount();
	for (int i=0; i<nColumnCount; i++)
		m_ListCtrl.DeleteColumn(0);

	_CommandPtr pCmd;
	pCmd.CreateInstance(__uuidof(Command));			// 初始化Command指针
	pCmd->ActiveConnection = m_pConnection;			// 指向已有的连接
	pCmd->CommandText = _bstr_t(strSQL);

	_RecordsetPtr pSet;
	pSet.CreateInstance(__uuidof(Recordset));	// 初始化Recordset指针
	pSet = pCmd->Execute(NULL, NULL, adCmdText );	
	// 建立列表控件的列表头
	FieldsPtr flds = pSet->GetFields();			// 获取当前表的字段指针
	_variant_t Index;
	Index.vt = VT_I2;
	m_ListCtrl.InsertColumn(0, "序号", LVCFMT_LEFT, 40 );
	for (i = 0; i < (int)flds->GetCount(); i++)   {
		Index.iVal = i;
		int nWidth = flds->GetItem(Index)->GetDefinedSize()*9;
		if ( nWidth < 40 ) nWidth = 40;
		if ( nWidth > 200 ) nWidth = 200;
		m_ListCtrl.InsertColumn(i+1, (LPSTR)flds->GetItem(Index)->GetName(), 
			LVCFMT_LEFT,  nWidth);
	}
	// 显示记录
	_bstr_t str, value;
	int nItem = 0;
	CString strItem;
	while(!pSet->adoEOF){
		strItem.Format("%d", nItem+1);
		m_ListCtrl.InsertItem(nItem, strItem );
		for (i = 0; i < (int)flds->GetCount(); i++)  {
			Index.iVal = i;
			str = flds->GetItem(Index)->GetName();
			try{
				value = pSet->GetCollect(str);
				m_ListCtrl.SetItemText( nItem, i+1, (LPCSTR)value );
			}catch(...)
			{}
		}
		pSet->MoveNext();
		nItem++;
	}
	pSet->Close();	
}

void CStudentDlg::OnSelchangeCombo1() 
{
	// TODO: Add your control notification handler code here
	int nIndex = m_ComboTable.GetCurSel();
	if ( nIndex == CB_ERR ) return;

	switch ( nIndex )
	{
	case 0:			DispAllRec("SELECT * FROM student ORDER BY XH");	break;
	case 1:			DispAllRec("SELECT * FROM course ORDER BY KCH");	break;
	case 2:			DispAllRec("SELECT * FROM score ORDER BY XH");	break;
	}	
}

void CStudentDlg::OnButtonStat() 
{
	// TODO: Add your control notification handler code here
	CDrawDlg dlg;
	dlg.m_nMode = 1;
	dlg.m_strTitle = "示例：这是一个圆饼图";
	dlg.m_uData.Add( 2 );			dlg.m_uData.Add( 1 );
	dlg.m_uData.Add( 11 );		dlg.m_uData.Add( 15 );
	dlg.m_uData.Add( 24 );		dlg.m_uData.Add( 6 );
	dlg.DoModal();
	
}