usermaintenancedlg.cpp

《Visual C++ Bible》或者说是《Visual C++ 宝典》的对应的源码文件

// UserMaintenanceDlg.cpp : implementation file
//

#include "stdafx.h"
#include "UserMaintenance.h"
#include "UserMaintenanceDlg.h"

#include "UserMasterSet.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()

/////////////////////////////////////////////////////////////////////////////
// CUserMaintenanceDlg dialog

CUserMaintenanceDlg::CUserMaintenanceDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CUserMaintenanceDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CUserMaintenanceDlg)
	m_strUserName = _T("");
	m_strUserID = _T("");
	m_iStatus = 0;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CUserMaintenanceDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CUserMaintenanceDlg)
	DDX_Control(pDX, IDC_BTNSAVE, m_btnSave);
	DDX_Control(pDX, IDC_BTNDELETE, m_btnDelete);
	DDX_Control(pDX, IDC_BTNCLOSE, m_btnClose);
	DDX_Control(pDX, IDC_LBXUSERS, m_lbxUsers);
	DDX_Text(pDX, IDC_EDTUSERNAME, m_strUserName);
	DDX_Text(pDX, IDC_EDTUSERID, m_strUserID);
	DDX_Text(pDX, IDC_EDTSTATUS, m_iStatus);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CUserMaintenanceDlg, CDialog)
	//{{AFX_MSG_MAP(CUserMaintenanceDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_LBN_SELCHANGE(IDC_LBXUSERS, OnSelchangeLbxusers)
	ON_BN_CLICKED(IDC_BTNCLOSE, OnBtnclose)
	ON_BN_CLICKED(IDC_BTNSAVE, OnBtnsave)
	ON_BN_CLICKED(IDC_BTNDELETE, OnBtndelete)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CUserMaintenanceDlg message handlers

BOOL CUserMaintenanceDlg::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
	FillListboxWithUsers();
	InitControls();
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

void CUserMaintenanceDlg::FillListboxWithUsers()
{
	int iIndex;
	CDatabase db;
	CUserMasterSet* pUserMasterSet = NULL;

	TRY
	{
		if (db.Open("Visual C++ Bible - Chapter 17"))
		{
			pUserMasterSet = new CUserMasterSet();
			pUserMasterSet->Open();
			while (!pUserMasterSet->IsEOF())
			{
				CUser* pUser = new CUser();
				pUser->m_strUserID = pUserMasterSet->m_sUserID;
				pUser->m_strUserName = pUserMasterSet->m_sUserName;
				pUser->m_iStatus = pUserMasterSet->m_iStatus;

				iIndex = m_lbxUsers.AddString(pUserMasterSet->m_sUserName);
				m_lbxUsers.SetItemData(iIndex, (DWORD)pUser);

				pUserMasterSet->MoveNext();
			}

			pUserMasterSet->Close();
			delete pUserMasterSet;
			db.Close();
		}
	}
	CATCH(CDBException, p)
	{
		AfxMessageBox(p->m_strError);			

		if (pUserMasterSet)
		{
			if (pUserMasterSet->IsOpen())
			{
				pUserMasterSet->Close();
			}
			delete pUserMasterSet;
		}

		if (db.IsOpen())
		{
			db.Close();
		}
	}
	END_CATCH

}

void CUserMaintenanceDlg::InitControls()
{
	m_lbxUsers.SetCurSel(-1);

	m_strUserID = "";
	m_strUserName = "";
	m_iStatus = -1;

	m_btnSave.EnableWindow(FALSE);
	m_btnDelete.EnableWindow(FALSE);
	m_btnClose.EnableWindow(TRUE);

	m_lbxUsers.SetFocus();
		
	UpdateData(FALSE);
}

void CUserMaintenanceDlg::OnSelchangeLbxusers() 
{
	int iIndex;
	CUser* pUser;

	if (GetSelectedUser(&iIndex, &pUser))
	{
		m_strUserID = pUser->m_strUserID;
		m_strUserName = pUser->m_strUserName;
		m_iStatus = pUser->m_iStatus;

		m_btnSave.EnableWindow(TRUE);
		m_btnDelete.EnableWindow(TRUE);
		
		UpdateData(FALSE);
		UpdateData(FALSE);
	}
}

BOOL CUserMaintenanceDlg::GetSelectedUser(int* piIndex, CUser** ppUser)
{
	BOOL bSuccess = FALSE;
	
	int iIndex;
  if (LB_ERR != (iIndex = m_lbxUsers.GetCurSel()))
  {
		*piIndex = iIndex;
		*ppUser = (CUser*)m_lbxUsers.GetItemData(iIndex);
		bSuccess = TRUE;
	}

	return bSuccess;
}

void CUserMaintenanceDlg::OnBtnclose() 
{
	CDialog::OnCancel();
}


void CUserMaintenanceDlg::OnBtnsave() 
{
	int iCurrIndex;	
	
	CUser* pUser = NULL;
	if (GetSelectedUser(&iCurrIndex, &pUser))
	{                                 
		ASSERT(pUser);
		if (pUser)
		{
			UpdateData();
	
			CString strPrevUserID;
			strPrevUserID = m_strUserID;
			CString strPrevUserName;
			strPrevUserName = m_strUserName;
			int iPrevStatus = m_iStatus;
			
			pUser->m_strUserID = m_strUserID;
			pUser->m_strUserName = m_strUserName;
			pUser->m_iStatus = m_iStatus;
			if (SaveUser(pUser))
			{
				if (LB_ERR == m_lbxUsers.DeleteString(iCurrIndex))
				{           
					AfxMessageBox("The User ID was Saved, but the previous User ID could not be removed from the listbox.");
				}                      
				else 
				{    
					int iNewIndex = m_lbxUsers.AddString(pUser->m_strUserName);
					if ((LB_ERR == iNewIndex) || (LB_ERRSPACE == iNewIndex))
					{
						AfxMessageBox("The User ID was Saved, but the new User ID could not be added to the listbox.");
					}
					if (LB_ERR == m_lbxUsers.SetItemData(iNewIndex, (DWORD)pUser))
					{
						AfxMessageBox("SetItemData returned LB_ERR. This will probably cause serious problems if you attempt to update or delete this item from the listbox");
					}
				}
	
				InitControls();
	
				UpdateData(FALSE);
			}   
			else
			{
				pUser->m_strUserID = strPrevUserID;
				pUser->m_strUserName = strPrevUserName;
				pUser->m_iStatus = iPrevStatus;
				AfxMessageBox("SaveUser failed");
			}
		}
	}
	else
	{
		// should never get here because of enabling/disabling button on lbx selection
		AfxMessageBox("You must first select a User ID to Save");
	}
}	

BOOL CUserMaintenanceDlg::SaveUser(CUser* pUser)
{
	BOOL bSuccess = FALSE;
	CDatabase db;

	TRY
	{
		if (db.Open("Visual C++ Bible - Chapter 17"))
		{
			CString strSQL = CString("UPDATE UserMaster SET ");
			strSQL += CString("sUserName = '") + pUser->m_strUserName + CString("', ");

			strSQL += CString("iStatus = ");
			char szStatus[10];
			itoa(pUser->m_iStatus, szStatus, 10);
			strSQL += szStatus;

			strSQL += CString(" WHERE sUserID = ");
			strSQL += CString("'") + pUser->m_strUserID + CString("'");

			db.ExecuteSQL(strSQL);

			bSuccess = TRUE;
		}
	}
	CATCH(CDBException, p)
	{
		AfxMessageBox(p->m_strError);			

		if (db.IsOpen())
		{
			db.Close();
		}
	}
	END_CATCH

	return bSuccess;
}

void CUserMaintenanceDlg::OnBtndelete() 
{
	int iIndex;	
	CUser* pUser = NULL;
	if (GetSelectedUser(&iIndex, &pUser))
	{                                 
		ASSERT(pUser);
		if (pUser)
		{
			UpdateData();
			CString strMsg;
	
			strMsg = "Are you sure that you want to delete the User ";
			strMsg += "'";
			strMsg += pUser->m_strUserName;
			strMsg += "'?";
			if (IDYES == AfxMessageBox(strMsg, MB_YESNOCANCEL))
			{				
				if (DeleteUser(pUser))
				{
					if (LB_ERR == m_lbxUsers.DeleteString(iIndex))
					{           
						AfxMessageBox("The User was successfully Deleted, but there was an error in removing it from the listbox.");
					}
					InitControls();
					
					UpdateData(FALSE);
				}   
				else
				{
					AfxMessageBox("DeleteUser failed");
				}
			}
		}
	}
	else
	{
		// should never get here because of enabling/disabling button on lbx selection
		AfxMessageBox("You must first select a User ID to Delete");
	}
}

BOOL CUserMaintenanceDlg::DeleteUser(CUser* pUser)
{
	BOOL bSuccess = FALSE;
	CDatabase db;

	TRY
	{
		if (db.Open("Visual C++ Bible - Chapter 17"))
		{
			CString strSQL = CString("DELETE FROM UserMaster WHERE ");
			strSQL += CString("sUserID = '") + pUser->m_strUserID + CString("'");

			db.ExecuteSQL(strSQL);

			bSuccess = TRUE;
		}
	}
	CATCH(CDBException, p)
	{
		AfxMessageBox(p->m_strError);			

		if (db.IsOpen())
		{
			db.Close();
		}
	}
	END_CATCH

	return bSuccess;
}