Finding Duplicate Barcodes

Take the following steps to add code to the existing project that will let you to find duplicate barcodes:

1. Start with the program you created in Reading Barcodes.

2. Click the "Solution Explorer" tab.

3. Double-click the "BarcodeTutor" folder to open it.

4. Double-click the "Resource Files" folder to open it. Then double click "BarcodeTutor.rc" file to open it, then double click "Dialog", and then double click "IDD_BARCODETUTOR_DIALOG".

5. Now, drag and drop 1 button, and change its properties as follows:|

   Name	ID	Caption
   Button4	IDC_FIND_DUPLICATE	Find Duplicate

6. From the View menu, select "Other Windows" menu, then select "Resource View" menu, then select Dialog, and select "IDD_BARCODETUTOR_DIALOG".

7. Double click "the Find Duplicate" button, and add the following code:

   L_INT nDupIndex=0; 
   L_TCHAR szBuffer[MAX_PATH]; 
   memset(szBuffer, 0, MAX_PATH); 
   pBARCODEDATA pBarData = NULL; 
   if (m_Barcode.IsDuplicated(0)) 
   { 
      nDupIndex = m_Barcode.GetFirstDuplicated(0); 
      if (nDupIndex >= 0) 
      { 
         pBarData = m_Barcode.GetBarCodeDataItem(nDupIndex); 
         // Print the first duplicated barcode data 
         wsprintf(szBuffer, TEXT("Data is %hs\nUnits %d\nPosX %d\nPosY %d\nWidth %d\nHeight %d\n\n"), 
         pBarData->pszBarCodeData, 
         pBarData->nUnits, 
         pBarData->rcBarLocation.left, 
         pBarData->rcBarLocation.top, 
         abs(pBarData->rcBarLocation.right - pBarData->rcBarLocation.left), 
         abs(pBarData->rcBarLocation.bottom - pBarData->rcBarLocation.top)); 
         AfxMessageBox(szBuffer); 
         // find the next (second) duplicated barcode data 
         nDupIndex = m_Barcode.GetNextDuplicated(nDupIndex); 
         if (nDupIndex >= 0) 
         { 
            pBarData = m_Barcode.GetBarCodeDataItem(nDupIndex); 
            wsprintf(szBuffer, TEXT("Data is %hs\nUnits %d\nPosX %d\nPosY %d\nWidth %d\nHeight %d\n\n"), 
            pBarData->pszBarCodeData, 
            pBarData->nUnits, 
            pBarData->rcBarLocation.left, 
            pBarData->rcBarLocation.top, 
            abs(pBarData->rcBarLocation.right - pBarData->rcBarLocation.left), 
            abs(pBarData->rcBarLocation.bottom - pBarData->rcBarLocation.top)); 
            AfxMessageBox(szBuffer); 
         } 
      } 
      if (nDupIndex < 0) 
      { 
         wsprintf(szBuffer, TEXT("An error occurred \nError Code = %d\n"), nDupIndex); 
         AfxMessageBox(szBuffer); 
      } 
   } 
   else 
   { 
      wsprintf(szBuffer, TEXT("This Barcode is not duplicated ...")); 
      AfxMessageBox(szBuffer); 
   } 

8. Compile and test the program.