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LoadSvgAsyncCompleted Event

Summary

Indicates that an asynchronous load SVG operation has been completed.

Syntax
C#
VB
Java
C++
public event EventHandler<CodecsLoadSvgAsyncCompletedEventArgs> LoadSvgAsyncCompleted 
Public Event LoadSvgAsyncCompleted As EventHandler(Of CodecsLoadSvgAsyncCompletedEventArgs) 
synchronized public void addLoadSvgAsyncCompletedListener(CodecsLoadSvgAsyncCompletedListener listener) 
synchronized public void removeLoadSvgAsyncCompletedListener(CodecsLoadSvgAsyncCompletedListener listener) 
public: 
event EventHandler<CodecsLoadSvgAsyncCompletedEventArgs^>^ LoadSvgAsyncCompleted 

Event Data

The event handler receives an argument of type CodecsLoadSvgAsyncCompletedEventArgs containing data related to this event. The following CodecsLoadSvgAsyncCompletedEventArgs properties provide information specific to this event.

PropertyDescription
Cancelled (Inherited from System.ComponentModel.AsyncCompletedEventArgs)Gets a value indicating whether an asynchronous operation has been canceled.
Document Gets the ISvgDocument object being loaded.
UserState (Inherited from System.ComponentModel.AsyncCompletedEventArgs)Gets the unique identifier for the asynchronous task.

Remarks

NOTE: This topic is part of RasterCodecs Async support using the .NET System.ComponentMode.AsyncOperation model. For .NET async/await support this type/member is not used. Instead, refer to RasterCodecs Async Operations.

The RasterCodecs class supports loading SVG from image files asynchronously using the LoadSvgAsync methods. When calling any of these methods, the caller thread will not be blocked and the method will return instantly.

When the RasterCodecs object finishes loading the SVG, the LoadSvgAsyncCompleted event will occur when the operation is finished (or when an error occur).

The LoadSvgAsyncCompleted event uses a data argument object of type CodecsLoadSvgAsyncCompletedEventArgs. This class contains the following properties:

Property Description
CodecsLoadSvgAsyncCompletedEventArgs.Uri, CodecsLoadSvgAsyncCompletedEventArgs.Stream and CodecsLoadSvgAsyncCompletedEventArgs.FileName

Contains the URI, stream or file name passed to the method that initialized this asynchronous operation.

Only one of these properties can be a valid value (not a null reference) at any time The property that contains a valid reference depends on what version of LoadSvgAsync method has been called.

For example, if LoadSvgAsync(Uri uri, int pageNumber, CodecsLoadSvgOptions options, object userState) is being called, the Uri will contain the same URI passed to the method while Stream and FileName will both be null. If LoadSvgAsync(String fileName, int pageNumber, CodecsLoadSvgOptions options, object userState) is being called, the FileName will contain the same file name string value passed to the method while Uri and Stream will both be null and so on.

CodecsLoadSvgAsyncCompletedEventArgs.Document

Contains the ISvgDocument instance that contains the SVG data of the page being loaded. When the asynchronous operation completes, the LoadSvgAsyncCompleted event will fire and Document will contain the final and ready to use SVG object. If an error occurs, this property will be set to null and the object is disposed internally by the toolkit.

CodecsLoadSvgAsyncCompletedEventArgs.Error

Contains any errors that might have occurred during the asynchronous operation. You must check this value when the LoadSvgAsyncCompleted event fires and make sure it does not contain a valid Exception object.

CodecsLoadSvgAsyncCompletedEventArgs.Cancelled

Contains a value indicating whether an asynchronous operation has been canceled. For example, by calling CancelAsync when using RasterCodecs.LoadSvgAsync with a URL.

For more information, refer to Working With SVG.

Example

This example will load a page from a URL as SVG:

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Svg; 
using LeadtoolsExamples.Common; 
 
public static void LoadSvgAsyncExample() 
{ 
   // Address of a document thats supports loading as SVG, for example, a DOCX file 
   string address = @"http://localhost/images/examples/leadtools.docx"; 
 
   EventHandler<CodecsLoadSvgAsyncCompletedEventArgs> loadSvgAsyncCompleted = null; 
 
   loadSvgAsyncCompleted = (sender, e) => 
   { 
      var thisCodecs = sender as RasterCodecs; 
      // Remove the handler 
      thisCodecs.LoadSvgAsyncCompleted -= loadSvgAsyncCompleted; 
 
      Console.WriteLine("Loading from {0} is done", e.Uri); 
      SvgDocument svgDocument = e.Document as SvgDocument; 
 
      if (svgDocument != null) 
      { 
         // Show its size 
         if (!svgDocument.Bounds.IsValid) 
            svgDocument.CalculateBounds(false); 
 
         Console.WriteLine("Bounds: {0}", svgDocument.Bounds.Bounds); 
         svgDocument.Dispose(); 
      } 
      else if (e.Error != null) 
      { 
         // Error 
         Console.WriteLine(e.Error.Message); 
      } 
 
      // Clean up 
      thisCodecs.Dispose(); 
   }; 
 
   var codecs = new RasterCodecs(); 
 
   // Set 300 as the default value for loading document files 
   codecs.Options.RasterizeDocument.Load.Resolution = 300; 
 
   codecs.LoadSvgAsyncCompleted += loadSvgAsyncCompleted; 
   codecs.LoadSvgAsync(new Uri(address), 1, null, null); 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Drawing 
Imports Leadtools.Svg 
 
Public Shared Sub LoadSvgAsyncExample() 
   ' Address of a document thats supports loading as SVG, for example, a DOCX file 
   Dim address As String = "http://localhost/images/examples/leadtools.docx" 
 
   Dim loadSvgAsyncCompleted As EventHandler(Of CodecsLoadSvgAsyncCompletedEventArgs) = Nothing 
 
   loadSvgAsyncCompleted = 
      Sub(sender As Object, e As CodecsLoadSvgAsyncCompletedEventArgs) 
         Dim thisCodecs As RasterCodecs = DirectCast(sender, RasterCodecs) 
         ' Remove the handler 
         RemoveHandler thisCodecs.LoadSvgAsyncCompleted, loadSvgAsyncCompleted 
 
         Console.WriteLine("Loading from {0} is done", e.Uri) 
         Dim svgDocument As SvgDocument = DirectCast(e.Document, SvgDocument) 
 
         If Not IsNothing(svgDocument) Then 
            ' Show its size 
            If Not svgDocument.Bounds.IsValid Then 
               svgDocument.CalculateBounds(False) 
            End If 
 
            Console.WriteLine("Bounds: {0}", svgDocument.Bounds.Bounds) 
            svgDocument.Dispose() 
         ElseIf Not IsError(e.Error) Then 
            ' Error 
            Console.WriteLine(e.Error.Message) 
         End If 
 
         ' Clean up 
         thisCodecs.Dispose() 
      End Sub 
 
   Dim codecs As New RasterCodecs() 
 
   ' Set 300 as the default value for loading document files 
   codecs.Options.RasterizeDocument.Load.Resolution = 300 
 
   AddHandler codecs.LoadSvgAsyncCompleted, loadSvgAsyncCompleted 
   codecs.LoadSvgAsync(New Uri(address), 1, Nothing, Nothing) 
End Sub 

Requirements

Target Platforms

Help Version 20.0.2019.3.11
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