Painting Pages and Zones (Visual C++ 5.0 and later))

Painting Pages and Zones

Take the following steps to add code to the existing project that will let you recognize pages:

1.	Start with the program you created in Working with Pages.
2.	Add the following command buttons to the main window and set the ID and Caption properties as follows:
	ID	Caption
	IDC_DRAW_ZONES	Draw Zones
	IDC_DRAWPAGE	Draw Page
3.	Edit the OCRTutorDlg.h file and change the definition of COCRTutorDlg : CDialog by inserting the following line after DECLARE_MESSAGE_MAP:

BOOL m_bDrawZones;
BOOL m_bDrawPage;

4.	Edit the OCRTutorDlg.cpp file and add the following to the OnInitDialog procedure as follows:

m_bDrawZones = FALSE;
m_bDrawPage = TRUE;

5.	Press Ctrl-W to go to the MFC Class Wizard; then do the following:
	a.	Click the Message Maps tab.
	b.	In the Class Name combo box, select COCRTutorDlg.
	c.	In the Object IDs list box, select IDC_DRAW_ZONES.
	d.	In the Messages list box, select BN_CLICKED
	e.	Click the Add function button. Choose OK for the default function name (OnDrawZones).
	f.	Click the Edit Code button and code the OnDrawZones procedure as follows:

m_bDrawZones = !m_bDrawZones;

6.	Edit the OnAddpage procedure, add the following lines after "AddPage()…":

   m_bDrawPage = FALSE;
   m_pRasterDoc->ActivePageIndex = 0;
   m_bDrawPage = TRUE;

7.	Press Ctrl-W to go to the MFC Class Wizard; then do the following:
	a.	Click the Message Maps tab.
	b.	In the Class Name combo box, select COCRTutorDlg.
	c.	In the Object IDs list box, select IDC_DRAWPAGE.
	d.	In the Messages list box, select BN_CLICKED
	e.	Click the Add function button. Choose OK for the default function name (OnDrawpage).
	f.	Click the Edit Code button and code the OnDrawpage procedure as follows:

   if (m_bDrawPage)
   {
      CClientDC * pDc = new CClientDC(this);
      m_pRasterDoc->EnableShowZones = m_bDrawZones;
      m_pRasterDoc->DrawPersistence = FALSE;
      m_pRasterDoc->DrawPage (NULL, (long)pDc->m_hDC, 0);
   }

8.	Build OCRTutor.exe.
9.	Run OCRTutor.exe.