StopRedirecting Method

Summary

Stops file I/O redirection and resets the I/O methods back to their defaults.

Syntax

C++/CLI

Java

Python

public void StopRedirecting()

public void stopRedirecting()

public: 
void StopRedirecting();

def StopRedirecting(self):

Remarks

LEADTOOLS I/O redirection allows you to replace the default input/output methods for opening, reading, writing, seeking, and closing files.

For example, you can redirect all the library I/O methods to your own I/O methods to load/save images from your own streams.

Call StartRedirecting to enable I/O redirection and StopRedirecting to reset it back to the defaults.

Example

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Svg; 
 
 
 
// Redirect Read event example 
FileStream myStream; 
 
// Redirect Open event example 
private void Codecs_Open(object sender, CodecsRedirectOpenEventArgs e) 
{ 
   myStream = new FileStream(e.FileName, e.Mode); 
   Console.WriteLine("Access: {0}, Share: {1}", e.Access, e.Share); 
   e.Success = true; 
} 
 
// Redirect Seek event example 
private void Codecs_Seek(object sender, CodecsRedirectSeekEventArgs e) 
{ 
   myStream.Seek(e.Offset, e.Origin); 
   e.Offset = myStream.Position; 
} 
 
// Redirect Read event example 
private void Codecs_Read(object sender, CodecsRedirectReadEventArgs e) 
{ 
   byte[] byteBuffer = new byte[e.Count]; 
   myStream.Read(byteBuffer, 0, e.Count); 
   Marshal.Copy(byteBuffer, 0, e.Buffer, e.Count); 
   e.Read = e.Count; 
   Debug.WriteLine("The number of bytes that read request should copy to the buffer is : {0}", e.Count); 
   Debug.WriteLine("The actual number of bytes that this read request has copied to Buffer is : {0}", e.Read); 
} 
 
// Redirect Write event example 
private void Codecs_Write(object sender, CodecsRedirectWriteEventArgs e) 
{ 
   byte[] byteBuffer = new byte[e.Count]; 
   Marshal.Copy(e.Buffer, byteBuffer, 0, e.Count); 
   myStream.Write(byteBuffer, 0, e.Count); 
   e.Written = e.Count; 
 
   Debug.WriteLine("The number of bytes that write request should copy from the buffer is : {0}", e.Count); 
   Debug.WriteLine("The actual number of bytes that this write request has copied from Buffer is : {0}", e.Written); 
} 
 
// Redirect Close event example 
private void Codecs_Close(object sender, CodecsRedirectCloseEventArgs e) 
{ 
   myStream.Close(); 
} 
 
 
public void StartRedirectingExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   codecs.RedirectOpen += new EventHandler<CodecsRedirectOpenEventArgs>(Codecs_Open); 
   codecs.RedirectSeek += new EventHandler<CodecsRedirectSeekEventArgs>(Codecs_Seek); 
   codecs.RedirectRead += new EventHandler<CodecsRedirectReadEventArgs>(Codecs_Read); 
   codecs.RedirectWrite += new EventHandler<CodecsRedirectWriteEventArgs>(Codecs_Write); 
   codecs.RedirectClose += new EventHandler<CodecsRedirectCloseEventArgs>(Codecs_Close); 
 
   string srcFilename = Path.Combine(LEAD_VARS.ImagesDir, "test_image1.cmp"); 
 
   codecs.StartRedirecting(); 
   RasterImage image = codecs.Load(srcFilename); 
   myStream.Close(); 
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Image1_redirect.jpg"), RasterImageFormat.Jpeg, image.BitsPerPixel); 
   codecs.StopRedirecting(); 
 
   // Clean up 
   myStream.Dispose(); 
   image.Dispose(); 
   codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

 
import java.io.*; 
import java.net.*; 
import java.nio.file.Paths; 
import java.util.*; 
import java.time.Instant; 
import java.time.Duration; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.codecs.RasterCodecs.FeedCallbackThunk; 
import leadtools.drawing.internal.*; 
import leadtools.imageprocessing.*; 
import leadtools.imageprocessing.color.ChangeIntensityCommand; 
import leadtools.svg.*; 
 
 
// LeadDynamicStream myStream; 
 
// // Redirect Open event example 
// CodecsRedirectOpenListener codecsOpen = new CodecsRedirectOpenListener() { 
 
// @Override 
// public void onRedirectOpen(CodecsRedirectOpenEvent e) { 
// try { 
// InputStream inputStream = Files.newInputStream(Paths.get(e.getFileName())); 
// myStream = new LeadDynamicStream(inputStream, false); 
// } catch (Exception ex) { 
// System.err.println(ex.getMessage()); 
// } 
 
// System.out.println("Mode: " + e.getMode()); 
// e.setSuccess(true); 
// } 
 
// }; 
 
// // Redirect Seek event example 
// CodecsRedirectSeekListener codecsSeek = new CodecsRedirectSeekListener() { 
 
// @Override 
// public void onRedirectSeek(CodecsRedirectSeekEvent e) { 
// myStream.seek(e.getOrigin(), e.getOffset()); 
// e.setOffset(0); 
// } 
 
// }; 
 
// // Redirect Read event example 
// CodecsRedirectReadListener codecsRead = new CodecsRedirectReadListener() { 
 
// @Override 
// public void onRedirectRead(CodecsRedirectReadEvent e) { 
// byte[] byteBuffer = new byte[e.getCount()]; 
// myStream.read(byteBuffer, e.getCount()); 
 
// e.setRead(e.getCount()); 
// System.out.println("The number of bytes that read request should copy to the 
// buffer is : " + e.getCount()); 
// System.out.println("The actual number of bytes that this read request has 
// copied to Buffer is : " + e.getRead()); 
// } 
 
// }; 
 
// // Redirect Write event example 
// CodecsRedirectWriteListener codecsWrite = new CodecsRedirectWriteListener() { 
 
// @Override 
// public void onRedirectWrite(CodecsRedirectWriteEvent e) { 
 
// byte[] byteBuffer = new byte[e.getCount()]; 
// // Marshal.Copy(e.getBuffer(), byteBuffer, 0, e.Count); 
// myStream.write(byteBuffer, e.getCount()); 
// e.setWritten(e.getCount()); 
 
// System.out.println("The number of bytes that write request should copy from 
// the buffer is : " + e.getCount()); 
// System.out.println("The actual number of bytes that this write request has 
// copied from Buffer is : " + e.getWritten()); 
// } 
 
// }; 
 
// // Redirect Close event example 
// CodecsRedirectCloseListener codecsClose = new CodecsRedirectCloseListener(){ 
 
// @Override 
// public void onRedirectClose(CodecsRedirectCloseEvent arg0) { 
// myStream.close(); 
// } 
 
// }; 
 
// // public void startRedirectingExample() throws IOException { 
// final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
// RasterCodecs codecs = new RasterCodecs(); 
 
// codecs.addRedirectOpenListener(codecsOpen); 
// codecs.addRedirectSeekListener(codecsSeek); 
// codecs.addRedirectReadListener(codecsRead); 
// codecs.addRedirectWriteListener(codecsWrite); 
// codecs.addRedirectCloseListener(codecsClose); 
// String srcFileName = combine(LEAD_VARS_IMAGES_DIR, "test_image1.cmp"); 
// System.out.println(srcFileName); 
 
// codecs.startRedirecting(); 
// RasterImage image = codecs.load(srcFileName); 
// myStream.close(); 
// codecs.save( 
// image, 
// combine(LEAD_VARS_IMAGES_DIR, 
// "Image1_redirect.jpg"), 
// RasterImageFormat.JPEG, 
// image.getBitsPerPixel() 
// ); 
// codecs.stopRedirecting(); 
 
// // Clean up 
// myStream.dispose(); 
// image.dispose(); 
// codecs.dispose(); 
// }

Requirements

Target Platforms

Reference

RasterCodecs Class

RasterCodecs Members

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Help Version 23.0.2024.2.29

Leadtools.Codecs Assembly

Introduction

Getting Started

Namespaces

Leadtools.Codecs Namespace

Assemblies