It’s part of our assignment to finish a MFC program as the final project for Software-tech-basis. This really really old and outdated app is hard to use for nowadays, but it may offer some insights into the C language.

basic notions

GDI（图形设备接口)
PDC (设备环境对象)
GDI的派生类有：CBitmap, CBrush, CFont….

上述4中的例子， f是CFont这个类创建的一个动态对象，在MFC中，无需显式的delete这些动态对象。

C++中，类的定义放在.h文件中，而.cpp文件存放类外定义的成员函数 下面6中的方法可以更改某个控件的属性

读取csv的方法：

CString str;
while(file.ReadString(str))
	{CString substr[10];
	int count=0;
	int index = str.Find(_T(","));
	CString stmp;
	while (index != -1 && count<9)
	{
	substr[count++] = str.Left(index);
	str=str.Right(str.GetLength()-index-1);
	index = str.Find(_T(","));
	}
	substr[count++]=str;
	}
	file.Close();

以上会在每个外层while循环内部，将各个单元格（此处不超过10个）的内容以字符串的形式储存在substr数组的各个元素中，在实际应用中，需要对字符串再做处理（如使用atoi()函数将字符串转化为整数）。

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our enhancements of the program

1. when nothing is ordered, the order will not be rocorded.
2. add an option of getting today’s bill only in the manager mode.

   if (substr[0] != today && m_today == TRUE)
        continue;
   

   and for the check button:

   m_today = !m_today;
   

3. in the manager mode, redirect the ENTER button to call the function OnButton1

   BOOL CManagerDlg::PreTranslateMessage(MSG* pMsg)
   {
    // TODO: Add your specialized code here and/or call the base class
    if (pMsg->message == WM_KEYDOWN)
        if (pMsg->wParam == VK_RETURN)
        {CManagerDlg::OnButton1();
        return true;}
    return CDialog::PreTranslateMessage(pMsg);
   }
   

4. to change the fonts of differnt text (rather than change all of them), use the SetFont in WMInitDialog

   CFont * f;
    f = new CFont;
     f->CreateFont(36, // nHeight   
       0, // nWidth   
       0, // nEscapement   
       0, // nOrientation   
       FW_BOLD, // nWeight   
       TRUE, // bItalic   
       FALSE, // bUnderline   
       0, // cStrikeOut   
       ANSI_CHARSET, // nCharSet   
       OUT_DEFAULT_PRECIS, // nOutPrecision   
       CLIP_DEFAULT_PRECIS, // nClipPrecision   
       DEFAULT_QUALITY, // nQuality   
       DEFAULT_PITCH | FF_SWISS, // nPitchAndFamily   
       _T("Arial")); // lpszFac   
    GetDlgItem(IDC_BUTTON1)->SetFont(f);
   

5. to set the focus on the password edit bar (so that the user can start entering password without having to select it), add the following:

   GetDlgItem(IDC_EDIT1)->SetFocus();
   

   and we have to change the return value of OnInitDialog() to FALSE, as MSDN explains

   If OnInitDialog returns nonzero, Windows sets the input focus to the first control in the dialog box.

   The application can return 0 only if it has explicitly set the input focus to one of the controls in the dialog box.

6. change the color of text: 1.add declaration of m_brush CBrush m_brush in Dlg.h 2.

    {   pDC->SetTextColor(RGB(255,0,0));//设置编辑框字体的颜色
        pDC->SetBkColor(RGB(255,255,0));//设置字体背景颜色
        CFont font;
        font.CreatePointFont(100,"华文楷体");
         pDC->SelectObject(&font);//设置字体        
        return m_brush;}
   

   we do so because MFC hints that
   Return a different brush if the default is not desired

7. everytime when opening each sub_dialog, the OnInitDialog function would show the current order status of each dish. To do this, just edit the m_password (a string which is the variable for the IDC_EDIT1), and then UpdateData(FALSE)
8. for the background picture, add the following code into onpaint():

    CPaintDC   dc(this);     
    CRect   rect;
    GetClientRect(&rect);//get the length and the width of the 	window.                                        
    CDC   dcBmp;                                           
    dcBmp.CreateCompatibleDC(&dc);                         
    CBitmap   bmpBackground;     
    bmpBackground.LoadBitmap(IDB_BITMAPBG);                 
    BITMAP m_bitmap;                                                     
    bmpBackground.GetBitmap(&m_bitmap);                    
    CBitmap   *pbmpOld=dcBmp.SelectObject(&bmpBackground);