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GetNextDuplicated Method

Summary

Returns the index of the next barcode in the array that is a duplicate of the barcode at the specified index.

Syntax

C++

public int GetNextDuplicated(  
   int index 
)

Public Function GetNextDuplicated( _ 
   ByVal index As Integer _ 
) As Integer

public: 
int GetNextDuplicated(  
   int index 
)

Parameters

index
A zero-based index of the current duplicated barcode. The value returned by this method will be greater than this value.

Return Value

=0, the index of the next barcode in the array that is a duplicate of the barcode at the specified index; otherwise, this method will throw an exception. An alternative way to avoid the exception, check the value of IndexDuplicate if it equals 0xFF, that means this the last duplicated one.

Remarks

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

Find the number of duplicates of a specific barcode
Determine whether a specific barcode is duplicated
Get the index of the first duplicated barcode
Get the index of a subsequent barcode

To determine whether a barcode is duplicated, use the IsDuplicated property. If a barcode is duplicated, the DuplicatedIndex property will return the index of the first barcode in the array after the specified barcode, which is a duplicate of the specified barcode. The DuplicateCount property will get the total number of barcodes duplicated for the current barcode.

If you know the index of a barcode within an array, use the IndexDuplicate property to get the next instance of a duplicated barcode. Call the GetFirstDuplicatedIndex method to find the index of the first barcode in the array that is a duplicate of the barcode at the specified index. Call the GetNextDuplicated method to find the index of the next barcode in the array that is a duplicate of the barcode at the specified index.

As an example, assume a call to the BarcodeEngine.Read method is made to read ten barcodes in an array of BarcodeData. Suppose the BarcodeData.IsDuplicated property is called for the item at index 3 in the array, and TRUE is returned. This indicates one or more barcodes in the array are duplicates of the specified item. Calling the BarcodeData.GetFirstDuplicated method returns the index of the first barcode in the array that is a duplicate of the barcode at index 3 in the array. Suppose this value is 0. The barcode present at index zero in the array is the first duplicate of the barcode at index 3. Calling this method with the index set to 3 will return the index of the next barcode in the array that is a duplicate of the barcodes at index 0 and 3. Suppose this value is 9. This means the barcodes at index 0, index 3, and index 9 of the array are all duplicates.

To find out how many sets of barcodes are duplicated (for example, in an array of ten barcodes, the first, third, and fifth might be duplicates of each other, while the 4th, 8th and 9th are duplicates of a different barcode), use the following code:

Visual Basic

Private Function GetSetsCount(ByRef barcodeData As RasterCollection(Of BarcodeData)) As Integer 
   Dim i As Integer 
   Dim j As Integer 
   Dim count As Integer 
   Dim visited() As Boolean 
   ReDim visited(barcodeData.Count) count = 0  
    
   For i = 0 To barcodeData.Count - 1 
      If visited(i) Then 
         Continue For 
      End If visited(i) = True  
       
      count += 1 
      j = i 
 
      While barcodeData(j).IndexDuplicate <> -1 And barcodeData(j).IndexDuplicate <> 255 
         j = barcodeData(j).IndexDuplicate 
         visited(j) = True  
      End While 
   Next 
 
   Return count 
End Function

public int GetSetsCount(RasterCollection<BarcodeData> barcodeData) 
{ 
   int i, j, count; 
 
   bool[] visited = new bool[barcodeData.Count]; 
   count = 0; 
 
   for (i = 0; i < barcodeData.Count; i++) 
   { 
      if (visited[i]) continue; 
      visited[i] = true; 
      count++; 
      j = i; 
      while (barcodeData[j].IndexDuplicate != -1 && barcodeData[j].IndexDuplicate != 255) 
      { 
         j = barcodeData[j].IndexDuplicate; 
         visited[j] = true; 
      } 
   } 
   return count; 
}

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

Requirements

Target Platforms

Reference

BarcodeData Class

BarcodeData Members

Help Version 19.0.2017.10.27