Working with Zones Using OCR Plus

To add code to an existing project that will let you recognize pages:

1.	Start with the program you created in Working with Pages.
2.	Define the following global IDs in Ezfunc.h in the DocumentTutor directory:

#define IDM_FIND_ZONES 201

#define IDM_ZONES_COUNT 202

#define IDM_ADD_VERIFICATION_ZONE 203

3.	Edit EZFUNC.RC file in the DocumentTutor directory and add the following lines:

MAIN_MENU MENU

BEGIN

...

MENUITEM "Find Zones" IDM_FIND_ZONES

MENUITEM "Zone Count" IDM_ZONES_COUNT

MENUITEM "Add Verification Zone" IDM_ADD_VERIFICATION_ZONE

END

4.	Define the following global variables in Ezfunc.H in the DocumentTutor directory:

L_INT nZoneCount;

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

      case IDM_FIND_ZONES:
         {
            AUTOZONEOPTS ZoneOpts;
            memset(&ZoneOpts, 0, sizeof(AUTOZONEOPTS));

            ZoneOpts.uStructSize = sizeof(AUTOZONEOPTS);
            ZoneOpts.bEnableForceSingleColumn = TRUE;
            ZoneOpts.bVisibleGridLines = TRUE;

            L_DocSetZoneOptions(hDoc, &ZoneOpts);
            nRet = L_DocFindZones(hDoc, 0, NULL);
            if (nRet == SUCCESS)
               MessageBox(NULL, TEXT("The automatic zone method found all available zones in the specified pages successfully."), TEXT("Notice!"), MB_OK);
            else
            {
               wsprintf (achBuff, TEXT("Error %d in finding available zones in the specified page."), nRet);
               MessageBox (NULL, achBuff, TEXT("Error"), MB_OK);
            }
         }

         break;
      case IDM_ZONES_COUNT:
         {
            nRet = L_DocGetZoneCount(hDoc, 0, &nZoneCount);
            if (nRet == SUCCESS)
            {
               wsprintf(achBuff, TEXT("Total Zones count = %d\n"), nZoneCount);
               MessageBox(NULL, achBuff, TEXT("Zones Count"), MB_OK);
            }
         }
         break;
      case IDM_ADD_VERIFICATION_ZONE:
         {
            ZONEDATA Zone;
            L_INT i;
            for(i=0; i<nZoneCount; i++)
            {
               memset(&Zone, 0, sizeof(ZONEDATA));
               nRet = L_DocGetZone(hDoc, 0, i, &Zone, sizeof(ZONEDATA));
               if (nRet == SUCCESS)
               {
                  if ((Zone.uFlags & ZONE_CHK_CHECKCBF_PROHIBIT) == ZONE_CHK_CHECKCBF_PROHIBIT)
                     Zone.uFlags &= ~ZONE_CHK_CHECKCBF_PROHIBIT;

                  Zone.pfnCallback = VerificationCB;
                  nRet = L_DocUpdateZone(hDoc, 0, i, &Zone);
                  if (nRet != SUCCESS)
                  {
                     wsprintf (achBuff, TEXT("Error %d in updating zone # %d"), nRet, i);
                     MessageBox (NULL, achBuff, TEXT("Error"), MB_OK);
                  }
               }
            }
         }
         break;

6.	Add the following function in EZFUNC.CPP in the DocumentTutor directory.

L_INT EXT_CALLBACK VerificationCB(L_INT nZoneIndex, L_TCHAR * pszWord, VERIFYCODE * pVerify, L_VOID * pUserData)
{
UNREFERENCED_PARAMETER(nZoneIndex);

UNREFERENCED_PARAMETER(pszWord);

UNREFERENCED_PARAMETER(pUserData);

*pVerify = VERIFY_ACCEPT;

return SUCCESS;
}

7.	Also, add the following statement before the MainWndProc function.

L_INT EXT_CALLBACK VerificationCB(L_INT nZoneIndex, L_TCHAR * pszWord, VERIFYCODE * pVerify, L_VOID * pUserData);

8.	Build SimpleLoad.exe.
9.	Run SimpleLoad.exe.

For more information, refer to:

OCR Plus Utility demo

Programming with LEADTOOLS OCR

OCR Frequently Asked Questions

Tutorials

Demo Programs