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LoadOptions(String) Method

Summary

Loads the default read options from the specified XML file for this BarcodeReader.

Syntax

C++

public void LoadOptions(  
   string fileName 
)

Public Overloads Sub LoadOptions( _ 
   ByVal fileName As String _ 
)

public: 
void LoadOptions(  
   String^ fileName 
)

Parameters

fileName
The XML file containing the data.

Remarks

The load/save methods are provided as helper methods for the user. The BarcodeEngine, BarcodeReader and BarcodeWriter do not use these methods internally.

The default read options can be retrieved using the GetDefaultOptions or GetAllDefaultOptions methods. You can then change the values of the BarcodeReadOptions object returned (or cast it back to the appropriate derived class). These options are used by the ReadBarcode and ReadBarcodes methods when no explicit options are passed by the user.

To save the default options to an XML file, use BarcodeReader.SaveOptions(string fileName).

To save and load data to an XML stream, use BarcodeReader.SaveOptions(Stream stream) and BarcodeReader.LoadOptions(Stream stream).

Example

This example shows how to change, save and then load the options of a BarcodeReader object.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Forms; 
using Leadtools.Barcode; 
using Leadtools.ImageProcessing; 
 
public void BarcodeReader_LoadSaveOptionsExample() 
{ 
   string xmlFileName = Path.Combine(LEAD_VARS.ImagesDir, "MyReadOptions.xml"); 
 
   BarcodeEngine engine1 = new BarcodeEngine(); 
   BarcodeReader reader1 = engine1.Reader; 
 
   // Show a few of the default options 
   ShowReaderOptions("Default options 1:", reader1); 
 
   // Change some options 
   OneDBarcodeReadOptions oneDReadOptions = reader1.GetDefaultOptions(BarcodeSymbology.UPCA) as OneDBarcodeReadOptions; 
   oneDReadOptions.SearchDirection = BarcodeSearchDirection.HorizontalAndVertical; 
   QRBarcodeReadOptions qrReadOptions = reader1.GetDefaultOptions(BarcodeSymbology.QR) as QRBarcodeReadOptions; 
   qrReadOptions.EnableDoublePass = true; 
 
   // Show them 
   ShowReaderOptions("New options 1:", reader1); 
 
   // Save the options to an XML file 
   reader1.SaveOptions(xmlFileName); 
 
   // Now create another BarcodeReader 
   // We could use the same one, but this example will show that changing the options 
   // for one BarcodeReader will not change it in any other in the application 
 
   BarcodeEngine engine2 = new BarcodeEngine(); 
   BarcodeReader reader2 = engine2.Reader; 
 
   // Show a few of the default options, should be the same as the first default options 
   ShowReaderOptions("Default options 2:", reader2); 
 
   // Load the options we just saved 
   reader2.LoadOptions(xmlFileName); 
 
   // Show them, should be the same as the new options in reader1 
   ShowReaderOptions("Loaded options 2:", reader2); 
} 
 
private void ShowReaderOptions(string message, BarcodeReader reader) 
{ 
   Console.WriteLine(message); 
   OneDBarcodeReadOptions oneDReadOptions = reader.GetDefaultOptions(BarcodeSymbology.UPCA) as OneDBarcodeReadOptions; 
   Console.WriteLine("OneDBarcodeReadOptions.SearchDirection: {0}", oneDReadOptions.SearchDirection); 
   QRBarcodeReadOptions qrReadOptions = reader.GetDefaultOptions(BarcodeSymbology.QR) as QRBarcodeReadOptions; 
   Console.WriteLine("QRBarcodeReadOptions.EnableDoublePass: {0}", qrReadOptions.EnableDoublePass); 
   Console.WriteLine("---------------"); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Forms 
Imports Leadtools.Barcode 
Imports Leadtools.ImageProcessing 
 
Public Sub BarcodeReader_LoadSaveOptionsExample() 
   Dim xmlFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "MyReadOptions.xml") 
 
   Dim engine1 As New BarcodeEngine() 
   Dim reader1 As BarcodeReader = engine1.Reader 
 
   ' Show a few of the default options 
   ShowReaderOptions("Default options 1:", reader1) 
 
   ' Change some options 
   Dim oneDReadOptions As OneDBarcodeReadOptions = DirectCast(reader1.GetDefaultOptions(BarcodeSymbology.UPCA), OneDBarcodeReadOptions) 
   oneDReadOptions.SearchDirection = BarcodeSearchDirection.HorizontalAndVertical 
   Dim qrReadOptions As QRBarcodeReadOptions = DirectCast(reader1.GetDefaultOptions(BarcodeSymbology.QR), QRBarcodeReadOptions) 
   qrReadOptions.EnableDoublePass = True 
 
   ' Show them 
   ShowReaderOptions("New options 1:", reader1) 
 
   ' Save the options to an XML file 
   reader1.SaveOptions(xmlFileName) 
 
   ' Now create another BarcodeReader 
   ' We could use the same one, but this example will show that changing the options 
   ' for one BarcodeReader will not change it in any other in the application 
 
   Dim engine2 As New BarcodeEngine() 
   Dim reader2 As BarcodeReader = engine2.Reader 
 
   ' Show a few of the default options, should be the same as the first default options 
   ShowReaderOptions("Default options 2:", reader2) 
 
   ' Load the options we just saved 
   reader2.LoadOptions(xmlFileName) 
 
   ' Show them, should be the same as the new options in reader1 
   ShowReaderOptions("Loaded options 2:", reader2) 
End Sub 
 
Private Sub ShowReaderOptions(ByVal message As String, ByVal reader As BarcodeReader) 
   Console.WriteLine(message) 
   Dim oneDReadOptions As OneDBarcodeReadOptions = DirectCast(reader.GetDefaultOptions(BarcodeSymbology.UPCA), OneDBarcodeReadOptions) 
   Console.WriteLine("OneDBarcodeReadOptions.SearchDirection: {0}", oneDReadOptions.SearchDirection) 
   Dim qrReadOptions As QRBarcodeReadOptions = DirectCast(reader.GetDefaultOptions(BarcodeSymbology.QR), QRBarcodeReadOptions) 
   Console.WriteLine("QRBarcodeReadOptions.EnableDoublePass: {0}", qrReadOptions.EnableDoublePass) 
   Console.WriteLine("---------------") 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class