borrowdlg.cpp

用MFC写的图书信息管理系统

// BorrowDlg.cpp : implementation file
//

#include "stdafx.h"
#include "library.h"
#include "BorrowDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CBorrowDlg dialog


CBorrowDlg::CBorrowDlg(CWnd* pView /*=NULL*/)
	: CDialog(CBorrowDlg::IDD, pView)
{
	//{{AFX_DATA_INIT(CBorrowDlg)
	m_nRid = 0;
	m_nBid = 0;
	m_pView=(CLibraryView*)pView;
	//}}AFX_DATA_INIT
}


void CBorrowDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CBorrowDlg)
	DDX_Text(pDX, IDC_EDIT_READER_ID, m_nRid);
	DDX_Text(pDX, IDC_EDIT_BOOK_ID, m_nBid);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CBorrowDlg, CDialog)
	//{{AFX_MSG_MAP(CBorrowDlg)
	ON_BN_CLICKED(IDC_BUT_BORROW, OnButBorrow)
	ON_BN_CLICKED(IDC_BUT_EXIT3, OnButExit)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CBorrowDlg message handlers

void CBorrowDlg::OnButBorrow() 
{
	// TODO: Add your control notification handler code here
	UpdateData(true);
	int readerid=m_nRid;
	int bookid=m_nBid;
	Reader* r=m_pView->rdb.query(readerid);
	Book *  b=m_pView->bdb.query(bookid);
	if (r==NULL)
	{
		AfxMessageBox("读者信息不存在,请核对正确信息");
		return;
	}
	if (b==NULL)
	{
		AfxMessageBox("不存在该图书.借书失败");
		return;
	}
	if(b->borrowbook()==0)
	{
		AfxMessageBox("该图书已经被借出");
		return;
	}
	int ret=r->borrowbook(b->getno());	
	if(ret==0)
		AfxMessageBox("你已借够5本书,无法再借!");
	else
		AfxMessageBox("借书成功!");


}

void CBorrowDlg::OnButExit() 
{
	// TODO: Add your control notification handler code here
	m_pView->PostMessage(DESTROY_BORROW_DLG);
	
}