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SaveXml(OcrXmlOutputOptions) Method

Summary

Converts the accumulated recognition results stored in the pages of this OCR document and returns it as XML data.

Syntax

C#
VB
Java
C++
public string SaveXml( 
   OcrXmlOutputOptions options 
) 

Overloads Function SaveXml( _ 
   ByVal options As OcrXmlOutputOptions _ 
) As String 

public String saveXml(int outputOptions) 

String^ SaveXml(  
   OcrXmlOutputOptions options 
)  

Parameters

options
A combination of one or more OcrXmlOutputOptions enumeration members that specify the XML generation options.

Return Value

A String object containing the XML data.

Remarks

To save the output document as XML to a disk file or a .NET stream, use IOcrDocument.SaveXml(string fileName, OcrXmlOutputOptions options) and IOcrDocument.SaveXml(Stream stream, OcrXmlOutputOptions options).

Each IOcrPage object in the Pages collection of this IOcrDocument object holds its recognition data internally. This data is used by this method to generate the final output document.

Typical OCR operation using the IOcrEngine involves starting up the engine. Creating a new IOcrDocument object using the CreateDocument method before adding the pages into it and perform either automatic or manual zoning. Once this is done, you can use the IOcrPage.Recognize method of each page to collect the recognition data and store it internally in the page. After the recognition data is collected, you use the various IOcrDocument.Save methods to save the document to its final format as well as IOcrDocument.SaveXml to save as XML.

You can also use the IOcrPage.GetText method to return the recognition data as a simple String object.

You can use IOcrDocument.SaveXml as many times as required to save the document to multiple formats. You can also continue to add and recognize pages (through the IOcrPage.Recognize method after you save the document.

For each IOcrPage that is not recognized (the user did not call Recognize and the value of the page IOcrPage.IsRecognized is still false) the IOcrDocument will insert an empty page into the final document.

To get the low level recognition data including the recognized characters and their confidence, use IOcrPage.GetRecognizedCharacters instead.

The IOcrDocument interface implements IDisposable, hence you must dispose the IOcrDocument object as soon as you are finished using it. Disposing an IOcrDocument object will free all the pages stored inside its IOcrDocument.Pages collection.

Example

This example recognize a page then process the result XML data.

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Ocr; 
using Leadtools.Forms.Common; 
using Leadtools.WinForms; 
using Leadtools.Drawing; 
 
public void SaveAndProcessXmlExample() 
{ 
   string tifFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif"); 
 
   // Create an instance of the engine 
   using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD, false)) 
   { 
      // Start the engine using default parameters 
      ocrEngine.Startup(null, null, null, LEAD_VARS.OcrLEADRuntimeDir); 
 
      // Create an OCR document 
      using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument()) 
      { 
         // Add this image to the document 
         IOcrPage ocrPage = ocrDocument.Pages.AddPage(tifFileName, null); 
 
         // Recognize it 
         ocrPage.Recognize(null); 
 
         // Get the recognition data as XML 
         string xml = ocrDocument.SaveXml(OcrXmlOutputOptions.None); 
 
         // Process the data by showing all the words 
         using (System.IO.StringReader reader = new System.IO.StringReader(xml)) 
         { 
            System.Xml.XPath.XPathDocument doc = new System.Xml.XPath.XPathDocument(reader); 
            System.Xml.XPath.XPathNavigator nav = doc.CreateNavigator(); 
 
            // Select all the <word> elements 
            System.Xml.XPath.XPathNodeIterator iter = nav.Select(@"//word"); 
 
            Console.WriteLine("Word found:"); 
            while (iter.MoveNext()) 
            { 
               Console.WriteLine(iter.Current.Value); 
            } 
         } 
      } 
 
      // Shutdown the engine 
      // Note: calling Dispose will also automatically shutdown the engine if it has been started 
      ocrEngine.Shutdown(); 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
   public const string OcrLEADRuntimeDir = @"C:\LEADTOOLS 20\Bin\Common\OcrLEADRuntime"; 
} 

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Ocr 
Imports Leadtools.Forms 
Imports Leadtools.WinForms 
Imports Leadtools.Drawing 
 
Public Sub SaveAndProcessXmlExample() 
   Dim tifFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif") 
 
   ' Create an instance of the engine 
   Using ocrEngine As IOcrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD, False) 
      ' Start the engine using default parameters 
      ocrEngine.Startup(Nothing, Nothing, Nothing, LEAD_VARS.OcrLEADRuntimeDir) 
 
      ' Create an OCR document 
      Using ocrDocument As IOcrDocument = ocrEngine.DocumentManager.CreateDocument() 
         ' Add this image to the document 
         Dim ocrPage As IOcrPage = ocrDocument.Pages.AddPage(tifFileName, Nothing) 
 
         ' Recognize it 
         ocrPage.Recognize(Nothing) 
 
         ' Get the recognition data as XML 
         Dim xml As String = ocrDocument.SaveXml(OcrXmlOutputOptions.None) 
 
         ' Process the data by showing all the words 
         Using reader As New System.IO.StringReader(xml) 
            Dim doc As New System.Xml.XPath.XPathDocument(reader) 
            Dim nav As System.Xml.XPath.XPathNavigator = doc.CreateNavigator() 
 
            ' Select all the <word> elements 
            Dim iter As System.Xml.XPath.XPathNodeIterator = nav.Select("//word") 
 
            Console.WriteLine("Word found:") 
            While iter.MoveNext() 
               Console.WriteLine(iter.Current.Value) 
            End While 
         End Using 
      End Using 
 
      ' Shutdown the engine 
      ' Note: calling Dispose will also automatically shutdown the engine if it has been started 
      ocrEngine.Shutdown() 
   End Using 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
   Public Const OcrLEADRuntimeDir As String = "C:\LEADTOOLS 20\Bin\Common\OcrLEADRuntime" 
End Class 

Requirements

Target Platforms

Help Version 20.0.2018.6.20
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Leadtools.Ocr Assembly