L_BarCodeGetDuplicated

#include "ltbar.h"

L_LTBAR_API L_INT L_BarCodeGetDuplicated(pBarCodeDataItem)

pBARCODEDATA pBarCodeDataItem;

/* pointer to a BARCODEDATA structure */

Returns the index of the first barcode that is a duplicate of the specified barcode.

Parameter

Description

pBarCodeDataItem

Pointer to the BARCODEDATA structure that contains barcode information.

Returns

>= 0

The index of the duplicated barcode.

< 0

An error occurred. Refer to Return Codes.

Comments

LEADTOOLS provides a number of functions to let you work with duplicated barcodes. They let you:

To determine whether a barcode is duplicated, use the L_BarCodeIsDuplicated function. If a barcode is duplicated, L_BarCodeGetDuplicated will return the index of the first barcode in the array after the specified barcode, which is a duplicate of the specified barcode.

If you know the index of a barcode within an array, you can get the index of the first duplicate of the specified barcode using L_BarCodeGetFirstDuplicated. Use the L_BarCodeGetNextDuplicated to get the next instance of a duplicated barcode.

Although no function is included to tell you the number of different sets of barcodes that are duplicated, you can easily program this by using the following code:

L_INT i, j, nCount;
L_BOOL * pbVisited = (L_BOOL *)malloc(pBarCodeData->nTotalCount*sizeof(L_BOOL));
memset(pbVisited, 0, pBarCodeData->nTotalCount*sizeof(L_BOOL));
nCount = 0;
for (i=0; i<pBarCodeData->nTotalCount; i++)
{
if(pbVisited[i])
continue;
pbVisited[i] = TRUE;
nCount++;
j = i;
while(pBarCodeData[j].nIndexDuplicate != -1)
{
j = pBarCodeData[j].nIndexDuplicate;
pbVisited[j] = TRUE;
}
}
free(pbVisited);

After this code is executed, nCount will contain the number of different sets of barcodes.

Required DLLs and Libraries

LTBAR

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application

Platforms

Win32, x64, Mobile

See Also

Functions:

L_BarCodeRead, L_BarCodeFree, L_BarCodeIsDuplicated, L_BarCodeGetNextDuplicated, L_BarCodeVersionInfo, L_BarCodeGetFirstDuplicated, L_BarCodeWrite

Topics:

Programming with LEADTOOLS Barcode

BarCode C DLL Function Groups

Example

For complete sample code refer to MFCBar32 demo. 

 L_INT BarCodeGetDuplicatedExample(HWND hWnd, pBARCODEDATA pBarCodeData)
{
   L_INT nDupIndex=0;
   L_TCHAR szBuffer[256];
   if (!pBarCodeData) 
      return FAILURE;
   ZeroMemory(szBuffer, sizeof(szBuffer));
   if (L_BarCodeIsDuplicated(&(pBarCodeData)[0]))
   {
      nDupIndex = L_BarCodeGetDuplicated(&(pBarCodeData)[0]);
      if (nDupIndex >= 0)
      {
         // Print the first duplicated barcode data
         wsprintf(szBuffer, TEXT("Data is %hs\nType %d\nUnits %d\nPosX %d\nPosY %d\nWidth %d\nHeight %d\n\n"),
                  (pBarCodeData)[nDupIndex].pszBarCodeData, (pBarCodeData)[nDupIndex].ulType, (pBarCodeData)[nDupIndex].nUnits, 
                  (pBarCodeData)[nDupIndex].rcBarLocation.left,
                  (pBarCodeData)[nDupIndex].rcBarLocation.top,
                  abs((pBarCodeData)[nDupIndex].rcBarLocation.right - (pBarCodeData)[nDupIndex].rcBarLocation.left),
                  abs((pBarCodeData)[nDupIndex].rcBarLocation.bottom - (pBarCodeData)[nDupIndex].rcBarLocation.top));
         MessageBox(hWnd, szBuffer, TEXT("BarCode Info."), MB_OK);
         // find the next (second) duplicated barcode data
         nDupIndex = L_BarCodeGetNextDuplicated(pBarCodeData, nDupIndex);
         if (nDupIndex >= 0)
         {
            wsprintf(szBuffer, TEXT("Data is %hs\nType %d\nUnits %d\nPosX %d\nPosY %d\nWidth %d\nHeight %d\n\n"),
                     (pBarCodeData)[nDupIndex].pszBarCodeData, (pBarCodeData)[nDupIndex].ulType, (pBarCodeData)[nDupIndex].nUnits, 
                     (pBarCodeData)[nDupIndex].rcBarLocation.left,
                     (pBarCodeData)[nDupIndex].rcBarLocation.top,
                     abs((pBarCodeData)[nDupIndex].rcBarLocation.right - (pBarCodeData)[nDupIndex].rcBarLocation.left),
                     abs((pBarCodeData)[nDupIndex].rcBarLocation.bottom - (pBarCodeData)[nDupIndex].rcBarLocation.top));
            MessageBox(hWnd, szBuffer, TEXT("BarCode Info."), MB_OK);
            return SUCCESS;
         }
      }
      
      if (nDupIndex < 0)
      {
         wsprintf(szBuffer, TEXT("An error occurred \nError Code = %d\n"), nDupIndex);
         MessageBox(hWnd, szBuffer, TEXT("Notice!"), MB_OK);
         return nDupIndex;
      }
   }
   else
   {
      wsprintf(szBuffer, TEXT("This Barcode is not duplicated ..."));
      MessageBox(hWnd, szBuffer, TEXT("Notice!"), MB_OK);
   }
   return SUCCESS;
}