login.cpp

抄书本的DES对称加密算法

// Login.cpp : implementation file
//

#include "stdafx.h"
#include "Des.h"
#include "Login.h"
#include "DesEncrypt.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CLogin dialog


CLogin::CLogin(CWnd* pParent /*=NULL*/)
	: CDialog(CLogin::IDD, pParent)
{
	//{{AFX_DATA_INIT(CLogin)
	m_Name = _T("");
	m_Pow = _T("");
	//}}AFX_DATA_INIT
}


void CLogin::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CLogin)
	DDX_Text(pDX, IDC_EDIT1, m_Name);
	DDX_Text(pDX, IDC_EDIT2, m_Pow);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CLogin, CDialog)
	//{{AFX_MSG_MAP(CLogin)
	ON_BN_CLICKED(IDC_BUTTON1, OnOK)
	ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CLogin message handlers

void CLogin::OnInitADOConn()
{
	try
	{
		//创建连接对象实例
		m_pConnection.CreateInstance("ADODB.Connection");
		//设置连接字符串
		CString strConnect="DRIVER={Microsoft Access Driver (*.mdb)};\
			uid=;pwd=;DBQ=shujuku.mdb;";
		//使用Open方法连接数据库
		m_pConnection->Open((_bstr_t)strConnect,"","",adModeUnknown);
	}
	catch(_com_error e)
	{
		AfxMessageBox(e.Description());
	}
}

void CLogin::ExitConnect()
{
	//关闭记录集和连接
    if(m_pRecordset!=NULL)
		m_pRecordset->Close();
	m_pConnection->Close();
}

BOOL CLogin::HaveName(CString name, CString pow)
{
	//连接数据库
	OnInitADOConn();
	CString sql;
	sql.Format("select * from user where 用户名 = '%s' and 密码 = '%s'",name,pow);
	//创建记录集指针对象实例
	m_pRecordset.CreateInstance(__uuidof(Recordset));
	//打开记录集
	m_pRecordset->Open((_bstr_t)sql,m_pConnection.GetInterfacePtr(),adOpenDynamic,
		adLockOptimistic,adCmdText);
	if(!m_pRecordset->adoEOF)
		return TRUE;
	else
		return FALSE;
	//断开数据库连接
	ExitConnect();
}

void CLogin::OnOK() 
{
	// TODO: Add your control notification handler code here
	UpdateData(TRUE);
	if(m_Name.IsEmpty() || m_Pow.IsEmpty())
	{
		MessageBox("用户名或密码不能为空！");
		return;
	}
	char buf[255];
	long len = m_Pow.GetLength();
	char key[]={1,2,3,4,5,6,7,8};
	memset(buf, 0, sizeof(buf));
	strcpy(buf, m_Pow.GetBuffer(0));
	CDesEncrypt Des;
	Des.DesGo(buf, buf, len, key, sizeof(key), TRUE);
	CString str = buf;
	BOOL result = HaveName(m_Name,str);
	if(result)
		CDialog::OnOK();
	else
	{
		MessageBox("用户名或密码错误！");
		return;
	}
}

void CLogin::OnButton2() 
{
	// TODO: Add your control notification handler code here
	CDialog::OnCancel();
}