Painting Pages and Zones Using LEADTOOLS OCR Module - OmniPage Engine

To add code to an existing project in order to paint pages and zones:

1. Start with the program you created in Working with Zones.

2. Define the following global variables in EZFUNC.H in the OCR_Ltdoc2 directory:

   L_BOOL bDrawZones; 
   L_BOOL bDrawPage; 

3. Define the following global IDs in Ezfunc.h in the OCR_Ltdoc2 directory:

   #define IDM_DRAW_ZONES              204 

4. Edit EZFUNC.RC file in the OCR_Ltdoc2 directory and add the following lines:

   MAIN_MENU   MENU 
   BEGIN 
      ... 
      ... 
      MENUITEM "Enable Draw Zones"     IDM_DRAW_ZONES 
   END 

5. In Ezfunc.cpp in the MainWndProc procedure, add the following code to the switch statement for WM_COMMAND:

   case IDM_DRAW_ZONES: 
      bDrawZones = !bDrawZones; 
      InvalidateRect (hWnd, NULL, FALSE); 
   break; 

6. In EZFUNC.CPP under WM_CREATE inside IDM_INSERT_PAGE, add the following after L_Doc2AddPage()if (nRet != SUCCESS){}:

   L_Doc2SetActivePage(hDoc, 0); 
   bDrawPage = TRUE; 
   /* Get the client area of the adjusted window */ 
   GetClientRect(hWnd,&rClientSize); 
   /* Make the destination rectangle for painting the same as the client area */ 
   rLeadDest = rClientSize;  

7. In the MainWndProc procedure, replace the following code to WM_PAINT (Refer to documentation for an explanation of L_Doc2DrawPage function):

   case WM_PAINT: 
   hdc = BeginPaint (hWnd, &ps); 
   if (bDrawPage) 
   { 
      if (hpalPaint) /* If we have a paint palette, select it */ 
      { 
         hPalette = SelectPalette (hdc, hpalPaint, TRUE); 
         /* Uncomment this if you do not process WM_QUERYNEWPALETTE */ 
         /* RealizePalette (hdc); */ 
      } 
    
      L_Doc2DrawPage(hDoc, hdc, 0, NULL, NULL, &rLeadDest, &ps.rcPaint, SRCCOPY, bDrawZones); 
      if (hpalPaint)         /* Return old palette */ 
         SelectPalette (hdc, hPalette, TRUE); 
   } 
    
   EndPaint (hWnd, &ps); /* Return DC */ 
   return 0; 

8. Build SimpleLoad.exe.

9. Run SimpleLoad.exe.