logindlg.cpp

用户登录模块是用户启动系统与系统交互的第一个窗体

// LoginDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Login.h"
#include "LoginDlg.h"
#include "UserData.h"
#include "MD5.h"


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

/////////////////////////////////////////////////////////////////////////////
// CLoginDlg dialog

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

void CLoginDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CLoginDlg)
	DDX_Control(pDX, IDC_UserName, m_UserName);
	DDX_Control(pDX, IDC_Password, m_Password);
	//}}AFX_DATA_MAP
	//控制用户名最多输入20个字符
    m_UserName.SetLimitText(20);
    //控制用户密码最多输入40个字符
    m_Password.SetLimitText(40);
}

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

/////////////////////////////////////////////////////////////////////////////
// CLoginDlg message handlers

BOOL CLoginDlg::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
	//初始化m_uersdata
	m_userdata = new CUserData;
	//初始化登录次数
	Count=1;
	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 CLoginDlg::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 CLoginDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CLoginDlg::OnOK() 
{
	// TODO: Add extra validation here
   	CString Password,strPassword;
    CString UserName,StrTemp;   
    UpdateData(TRUE);

	//实例化加密解密算法类型
	CMD5* MyEncrypt = new CMD5;  
	//获取用户输入的用户名
    m_UserName.GetWindowText(StrTemp);
	//加密用户名
    UserName=MyEncrypt->MD5_Algorithm(StrTemp);
    //调用GetPassword函数判断数据库中是否有用户输入的用户名
	//如果有则返回与用户名相对应的用户密码
	if(m_userdata->GetPassword(&UserName,&strPassword))
	{		
		//获取用户输入的用户密码
        m_Password.GetWindowText(StrTemp);        
		//加密用户密码
		Password=(CString)MyEncrypt->MD5_Algorithm(StrTemp);
		//和数据库中密码比较，得到登录密码
		if(Password.CompareNoCase(strPassword)==0)
		{
			MessageBox("登录系统成功","系统登录",MB_OK|MB_ICONWARNING);	
			CDialog::OnOK();
			UpdateData(FALSE);
		}
		else
		{
			//如果登录次数小于3，程序关闭
			if (Count<3)
			{
				MessageBox("密码不正确","系统登录错误",MB_OK|MB_ICONWARNING);
				Count++;           //登录次数记录
				UpdateData(FALSE);
			} 
			else
			{
				MessageBox("登录次数过多，系统关闭","系统登录错误",MB_OK|MB_ICONWARNING);
	            UpdateData(FALSE);
				CDialog::OnOK();
			}
		}
	}
	else
	{
		//如果登录次数小于3，程序关闭
		if (Count<3)
		{
			MessageBox("非法用户名","系统登录错误",MB_OK|MB_ICONWARNING);
			Count++;           //登录次数记录
			UpdateData(FALSE);
		}
		else
		{
			MessageBox("登录次数过多，系统关闭","系统登录错误",MB_OK|MB_ICONWARNING);
			UpdateData(FALSE);
			CDialog::OnOK();
		}
	}	
}


void CLoginDlg::OnClose() 
{
	// TODO: Add your message handler code here and/or call default
	//释放 m_userdata
	delete m_userdata;

	CDialog::OnClose();
}