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Finding Duplicated Barcodes
  1. Start Visual Studio .NET.
  2. Start with the project that you created in Reading Bar Codes Tutorial
  3. Drag and drop two button in Form1. Change the following properties: Property Value: Name: btnFindDuplicate Text: Find Duplicate
  4. Add the following code for the btnFindDuplicate control’s click procedure:

    Visual Basic

    
Private Sub btnFindDuplicate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnFindDuplicate.Click
      Dim msg As String
      Dim data As BarcodeData = _readBarData(0)
      If data.IsDuplicated Then
         Dim dupIndex As Integer = data.GetFirstDuplicatedIndex(0)

         If dupIndex < 0 Then
            msg = String.Format("Error occurred in the GetFirstDuplicatedIndex method. Error No. = {0}\n", dupIndex)
            MessageBox.Show(Me, msg)
         Else
            ' Display the first duplicate barcode information.
            data = _readBarData(dupIndex)
            Dim barDataMsg As String = String.Format("Barcode Data = {0}\nType = {1}\nLeft = {2}\nTop = {3}\nRight = {4}\nBottom = {5}\n", _
                                              BarcodeData.ConvertToStringArray(data.Data), _
                                              data.SearchType, _
                                              data.Location.Left, _
                                              data.Location.Top, _
                                              data.Location.Right, _
                                              data.Location.Bottom)
            MessageBox.Show(Me, barDataMsg)

            dupIndex = data.GetNextDuplicated(dupIndex)
            If dupIndex < 0 Then
               msg = String.Format("Error occurred in the GetNextDuplicated method. Error No. = {0}\n", dupIndex)
               MessageBox.Show(Me, msg)
            Else
               ' Display the next duplicate barcode information.
               data = _readBarData(dupIndex)
               barDataMsg = String.Format("Barcode Data = {0}\nType = {1}\nLeft = {2}\nTop = {3}\nRight = {4}\nBottom = {5}\n", _
                                          BarcodeData.ConvertToStringArray(data.Data), _
                                          data.SearchType, _
                                          data.Location.Left, _
                                          data.Location.Top, _
                                          data.Location.Right, _
                                          data.Location.Bottom)
               MessageBox.Show(Me, barDataMsg)
            End If
         End If
      Else
         msg = String.Format("This Barcode is not duplicated ...")
         MessageBox.Show(Me, msg)
      End If
End Sub

    C#

    
private void btnFindDuplicate_Click(object sender, EventArgs e)
{
   string msg;
   BarcodeData data = _readBarData[0];
   if (data.IsDuplicated)
   {
      int dupIndex = data.GetFirstDuplicatedIndex(0);

      if (dupIndex < 0)
      {
         msg = string.Format("Error occurred in the GetFirstDuplicatedIndex method. Error No. = {0}\n", dupIndex);
         MessageBox.Show(this, msg);
      }
      else
      {
         /* Display the first duplicate barcode information. */
         data = _readBarData[dupIndex];
         string barDataMsg = string.Format("Barcode Data = {0}\nType = {1}\nLeft = {2}\nTop = {3}\nRight = {4}\nBottom {5}\n",
                                           BarcodeData.ConvertToStringArray(data.Data),
                                           data.SearchType,
                                           data.Location.Left,
                                           data.Location.Top,
                                           data.Location.Right,
                                           data.Location.Bottom);
         MessageBox.Show(this, barDataMsg);

         dupIndex = data.GetNextDuplicated(dupIndex);
         if (dupIndex < 0)
         {
            msg = string.Format("Error occurred in the GetNextDuplicated method. Error No. = {0}\n", dupIndex);
            MessageBox.Show(this, msg);
         }
         else
         {
            /* Display the next duplicate barcode information. */
            data = _readBarData[dupIndex];
            barDataMsg = string.Format("Barcode Data = {0}\nType = {1}\nLeft = {2}\nTop = {3}\nRight = {4}\nBottom = {5}\n",
                                       BarcodeData.ConvertToStringArray(data.Data),
                                       data.SearchType,
                                       data.Location.Left,
                                       data.Location.Top,
                                       data.Location.Right,
                                       data.Location.Bottom);
            MessageBox.Show(this, barDataMsg);
         }
      }
   }
   else
   {
      msg = string.Format("This Barcode is not duplicated ...");
      MessageBox.Show(this, msg);
   }
}