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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 a 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);
               }
            }
  5. Build, and Run the program to test it.