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JpipRasterImageViewer Class

Summary

Represents a LEADTOOLS control for the remote interactive browsing, loading and displaying of JPEG2000 images using the JPEG2000 Interactive Protocol (JPIP) protocol.

Syntax

C#
VB
C++
[ToolboxBitmapAttribute()] 
public class JpipRasterImageViewer : Leadtools.Winforms.Leadtools.WinForms.RasterImageViewer, System.ComponentModel.IComponent, System.ComponentModel.ISynchronizeInvoke, System.IDisposable, System.Windows.Forms.IBindableComponent, System.Windows.Forms.IDropTarget, System.Windows.Forms.IWin32Window 
<ToolboxBitmapAttribute()> 
Public Class JpipRasterImageViewer  
   Inherits Leadtools.Winforms.Leadtools.WinForms.RasterImageViewer 
   Implements System.ComponentModel.IComponent, System.ComponentModel.ISynchronizeInvoke, System.IDisposable, System.Windows.Forms.IBindableComponent, System.Windows.Forms.IDropTarget, System.Windows.Forms.IWin32Window 
[ToolboxBitmapAttribute()] 
public ref class JpipRasterImageViewer : public Leadtools.Winforms.Leadtools.WinForms.RasterImageViewer, System.ComponentModel.IComponent, System.ComponentModel.ISynchronizeInvoke, System.IDisposable, System.Windows.Forms.IBindableComponent, System.Windows.Forms.IDropTarget, System.Windows.Forms.IWin32Window

Remarks

The JpipRasterImageViewer is a JPIP client that can establish a connection with a JPIP server, access images on the server side, and load them interactively as the user pans, views or scrolls the image. When a file is first opened, the JpipRasterImageViewer control loads the lowest resolution that fits the viewer window and loads more data as the user starts panning, zooming or scrolling. If the image has multiple color components (Red, Green, Blue), browsing can be done for the desired component only.

Example

This example creates an instance of the JpipRasterImageViewer and requests an image, zooms in, specifies a component and copies the image to a local file.

C#
VB
Imports Leadtools 
      Imports Leadtools.Codecs 
      Imports Leadtools.Jpip 
      Imports Leadtools.Jpip.Client.WinForms 
      Imports Leadtools.Jpip.Client.InteractiveDecoder 
      Imports Leadtools.Jpip.Server 
 
      Private Const SERVER_NAME As String = "LEAD JPIP Server - Test Server" 
      Private Const ENUMERATION_SERVER_PORT As Integer = 109 
      Private Const JPIP_SERVER_PORT As Integer = 108 
      Private Const LOCAL_IP_ADDRESS As String = "127.0.0.1" 
      Private CLIENT_CACHE_DIRECTORY As String = Path.Combine(LEAD_VARS.ImagesDir, "jpeg2000") 
      Private SERVER_CACHE_DIRECTORY As String = Path.Combine(LEAD_VARS.ImagesDir, "jpeg2000") 
      Private SERVER_IMAGES_FOLDER As String = Path.Combine(LEAD_VARS.ImagesDir, "jpeg2000") 
      Private IMAGE_FILE_EXTENSIONS As String = "*.j2k;*.jp2;*.jpx" 
      Private CLIENT_SAVED_FILE_NAME As String = Path.Combine(LEAD_VARS.ImagesDir, "test.bmp") 
      Private _jpipServer As JpipServer 
      Private _imageFileExtensions As List(Of String) 
      Private _listener As HttpListener 
      Public _serverImagesList As List(Of String) = New List(Of String)() 
      Public Sub New() 
#If LEADTOOLS_V175_OR_LATER Then 
         Leadtools.Examples.Support.SetLicense() 
#Else 
         Leadtools.Examples.Support.Unlock() 
#End If ' #If LEADTOOLS_V175_OR_LATER Then 
         _imageFileExtensions = New List(Of String)() 
         _jpipServer = New JpipServer() 
      End Sub 
 
      Public Sub ClientRequestReceived(ByVal ar As IAsyncResult) 
         Dim context As HttpListenerContext 
 
 
         If Nothing Is _listener OrElse (Not _listener.IsListening) Then 
            Return 
         End If 
 
         Try 
            context = _listener.EndGetContext(ar) 
         Catch 
            Return 
         End Try 
 
         Try 
 
            Dim formattedImages As String 
            Dim sendBuffer As Byte() 
 
            _listener.BeginGetContext(AddressOf ClientRequestReceived, Nothing) 
 
            formattedImages = GetFormattedServerImagesString() 
 
            sendBuffer = Encoding.ASCII.GetBytes(formattedImages) 
 
            context.Response.OutputStream.Write(sendBuffer, 0, sendBuffer.Length) 
 
            context.Response.Close() 
         Catch e1 As Exception 
            If Not Nothing Is context Then 
               context.Response.Close() 
            End If 
         End Try 
      End Sub 
 
      Public Function GetFormattedServerImagesString() As String 
         Dim serverImageFile As String 
         Dim formattedServerImagesString As String = String.Empty 
         Dim searchImages As List(Of String) = New List(Of String)() 
         Dim serverImages As List(Of String) = New List(Of String)() 
         For Each extension As String In _imageFileExtensions 
            searchImages.AddRange(Directory.GetFiles(_jpipServer.Configuration.ImagesFolder, extension, SearchOption.AllDirectories)) 
         Next extension 
         For Each file As String In searchImages 
            serverImageFile = file.Replace(_jpipServer.Configuration.ImagesFolder, String.Empty) 
            serverImageFile = serverImageFile.TrimStart("\"c) 
            formattedServerImagesString &= serverImageFile & ";" 
         Next file 
         searchImages.Clear() 
         For Each aliasFolder As KeyValuePair(Of String, String) In _jpipServer.Configuration.AliasFolders 
            If (Not Directory.Exists(aliasFolder.Value)) Then 
               Continue For 
            End If 
            For Each extension As String In _imageFileExtensions 
               searchImages.AddRange(Directory.GetFiles(aliasFolder.Value, extension, SearchOption.AllDirectories)) 
            Next extension 
            For Each imageFile As String In searchImages 
               serverImageFile = imageFile.Replace(aliasFolder.Value, aliasFolder.Key) 
               serverImageFile = serverImageFile.TrimStart("\"c) 
               formattedServerImagesString &= serverImageFile & ";" 
            Next imageFile 
            searchImages.Clear() 
         Next aliasFolder 
         Return formattedServerImagesString.TrimEnd(";"c) 
      End Function 
 
      Public Sub StartFileEnumerationServer() 
         Try 
            _imageFileExtensions.Clear() 
            _imageFileExtensions.AddRange(IMAGE_FILE_EXTENSIONS.Split(";"c)) 
 
            If Not _listener Is Nothing Then 'if _listner is already created, then do not create again 
               Return 
            End If 
            _listener = New HttpListener() 
            _listener.Prefixes.Add(String.Format("http://{0}:{1}/", LOCAL_IP_ADDRESS, ENUMERATION_SERVER_PORT)) 
 
            _listener.Start() 
            _listener.BeginGetContext(AddressOf ClientRequestReceived, Nothing) 
         Catch ex As Exception 
            Debug.Fail("Error in server enumeration: " & Constants.vbLf + ex.Message) 
         End Try 
      End Sub 
 
 
      Public Sub StopFileEnumerationServer() 
         Try 
            If Not _listener Is Nothing Then 
               _listener.Stop() 
            End If 
         Catch ex As Exception 
            Debug.Fail("Error in server enumeration: " & Constants.vbLf + ex.Message) 
         End Try 
      End Sub 
 
      Public Sub GetEnumeratedFiles(ByVal filename As String) 
         Dim request As HttpWebRequest = CType(HttpWebRequest.Create(String.Format("http://{0}:{1}/", LOCAL_IP_ADDRESS, ENUMERATION_SERVER_PORT)), HttpWebRequest) 
 
         If Not Nothing Is request.Proxy Then 
            request.Proxy.Credentials = System.Net.CredentialCache.DefaultCredentials 
         End If 
 
         request.UseDefaultCredentials = True 
 
 
         Dim response As HttpWebResponse = CType(request.GetResponse(), HttpWebResponse) 
 
         Dim receivedStream As System.IO.Stream = response.GetResponseStream() 
         Dim reader As System.IO.StreamReader = New System.IO.StreamReader(receivedStream) 
 
         Dim read As Char() = New Char(255) {} 
         ' Reads 256 characters at a time.     
         Dim count As Integer = reader.Read(read, 0, 256) 
         Dim imageNames As String = "" 
 
         Do While count > 0 
            ' Dumps the 256 characters on a string and displays the string to the console. 
            Dim temp As String = New String(read, 0, count) 
 
            imageNames &= temp 
 
            count = reader.Read(read, 0, 256) 
         Loop 
 
         ' Releases the resources of the response. 
         response.Close() 
         ' Releases the resources of the Stream. 
         reader.Close() 
 
         Dim imageFileNames As String() = imageNames.Split(";"c) 
         Dim counter As Integer = 0 
         For Each image As String In imageFileNames 
            counter += 1 
            Debug.Assert(image.Trim().Length > 0, "There is no image to enumerate") 
            Debug.WriteLine("Image " & counter & ": " & image) 
            _serverImagesList.Add(image) 
         Next image 
 
         File.WriteAllLines(filename, _serverImagesList.ToArray()) 
      End Sub 
 
      Public Sub StartJpipServer() 
         If (Not _jpipServer.IsRunning) Then 
            'Server Settings 
            _jpipServer.Configuration.ServerName = SERVER_NAME 
            _jpipServer.Configuration.IPAddress = LOCAL_IP_ADDRESS 
            _jpipServer.Configuration.Port = JPIP_SERVER_PORT 
            _jpipServer.Configuration.ImagesFolder = SERVER_IMAGES_FOLDER 
            _jpipServer.Configuration.CacheFolder = SERVER_CACHE_DIRECTORY 
            _jpipServer.Configuration.MaxServerBandwidth = _jpipServer.Configuration.MaxServerBandwidth 
            _jpipServer.Configuration.CacheSize = 200 
            _jpipServer.Configuration.DivideSuperBoxes = True 
            _jpipServer.Configuration.ChunkSize = 512 
            _jpipServer.Configuration.MaxClientCount = 5 
            _jpipServer.Configuration.ConnectionIdleTimeout = New TimeSpan(0, 0, 9100) 
            _jpipServer.Configuration.MaxSessionLifetime = New TimeSpan(0, 0, 9900) 
            _jpipServer.Configuration.MaxConnectionBandwidth = _jpipServer.Configuration.MaxConnectionBandwidth 
            'Communication Settings 
            _jpipServer.Configuration.MaxTransportConnections = 15 
            _jpipServer.Configuration.HandshakeTimeout = New TimeSpan(0, 0, 9600) 
            _jpipServer.Configuration.RequestTimeout = New TimeSpan(0, 0, 920) 
            _jpipServer.Configuration.ChunkSize = 512 
            'Images Settings 
            _jpipServer.Configuration.ImageParsingTimeout = New TimeSpan(0, 0, 9180) 
            _jpipServer.Configuration.PartitionBoxSize = 40 
            _jpipServer.Configuration.DivideSuperBoxes = True 
            'Logging Settings 
            _jpipServer.Configuration.LogInformation = False 
            _jpipServer.Configuration.LogWarnings = False 
            _jpipServer.Configuration.LogDebug = False 
            _jpipServer.Configuration.LogErrors = False 
            'Start server and delegates 
            _jpipServer.Start() 
            Debug.Assert(_jpipServer.IsRunning, "Server did not start.") 
         End If 
      End Sub 
 
      Public Sub StopJpipServer() 
         If _jpipServer.IsRunning Then 
            _jpipServer.Stop() 
         End If 
      End Sub 
 
      Public Sub SetJpipViewer(ByVal viewer As JpipRasterImageViewer) 
         ' Initialize JPIP viewer   
         viewer.CacheDirectoryName = CLIENT_CACHE_DIRECTORY 
         viewer.PortNumber = JPIP_SERVER_PORT 
         viewer.IPAddress = LOCAL_IP_ADDRESS 
         viewer.PacketSize = 16384 
         viewer.RequestTimeout = New TimeSpan(0, 1, 0) 
         viewer.ChannelType = JpipChannelTypes.HttpChannel 
      End Sub 
 
      Public Sub SaveJpipViewerImageToFile(ByVal viewer As JpipRasterImageViewer, ByVal fileName As String) 
         Dim rc As RasterCodecs = New Leadtools.Codecs.RasterCodecs() 
         rc.Save(viewer.Image, fileName, RasterImageFormat.Bmp, 24) 
      End Sub 
 
      Private Sub OnClientError(ByVal sender As Object, ByVal e As ErrorEventArgs) 
         Debug.WriteLine(e.GetException().Message) 
      End Sub 
 
      Private Sub OnBytesLoaded(ByVal sender As Object, ByVal e As TotalBytesLoadedEventArgs) 
         Debug.WriteLine(" Total Bytes: " & e.ByteCount.ToString()) 
      End Sub 
 
      Private Sub FileOpened(ByVal sender As Object, ByVal e As EventArgs) 
 
         Dim jpipViewer As JpipRasterImageViewer = DirectCast(sender, JpipRasterImageViewer) 
         Dim deleteCacheFilePriorTo As DateTime = New DateTime(2008, 8, 8) 
 
         Debug.WriteLine(Constants.vbLf & " FullImageSize:          " & jpipViewer.FullImageSize.ToString()) 
         Debug.WriteLine(" NumberOfColorComponents:  " & jpipViewer.NumberOfColorComponents.ToString()) 
         Debug.WriteLine(" NumberOfResolutions:      " & jpipViewer.NumberOfResolutions.ToString()) 
         Debug.WriteLine(" InteractiveMode:          " & jpipViewer.InteractiveMode.ToString()) 
         Debug.WriteLine(" PaintProperties:          " & jpipViewer.PaintProperties.ToString()) 
         Debug.WriteLine(" current CodeStreamIndex   " & jpipViewer.CodeStream) 
         Debug.WriteLine(" NumberOfCodeStreams       " & jpipViewer.CodeStreamCount) 
         Debug.WriteLine(" Available Resolutions") 
         Dim i As Integer = 0 
         Do While i < jpipViewer.NumberOfResolutions 
            Debug.WriteLine(" Resolution (" & i.ToString() & ") Size" & jpipViewer.GetResolutionSize(i).ToString()) 
            i += 1 
         Loop 
         Debug.WriteLine(Constants.vbLf & "Open Image") 
         Debug.WriteLine(" CurrentImageSize:         " & jpipViewer.CurrentImageSize.ToString()) 
         Debug.WriteLine(" ComponentIndex:           " & jpipViewer.ComponentIndex.ToString()) 
         Debug.WriteLine(" CurrentResolutionIndex:   " & jpipViewer.CurrentResolutionIndex.ToString()) 
 
         jpipViewer.ZoomIn() 
         Debug.WriteLine(Constants.vbLf & " Zoomed in") 
         Debug.WriteLine(" CurrentImageSize:         " & jpipViewer.CurrentImageSize.ToString()) 
         Debug.WriteLine(" ComponentIndex:           " & jpipViewer.ComponentIndex.ToString()) 
         Debug.WriteLine(" CurrentResolutionIndex:   " & jpipViewer.CurrentResolutionIndex.ToString()) 
 
         jpipViewer.ZoomIn() 
         Debug.WriteLine(Constants.vbLf & " Zoomed in") 
         Debug.WriteLine(" CurrentImageSize:         " & jpipViewer.CurrentImageSize.ToString()) 
         Debug.WriteLine(" ComponentIndex:           " & jpipViewer.ComponentIndex.ToString()) 
         Debug.WriteLine(" CurrentResolutionIndex:   " & jpipViewer.CurrentResolutionIndex.ToString()) 
 
         jpipViewer.ComponentIndex = 0 
         Debug.WriteLine("Component Index value set to 1 ") 
         Debug.WriteLine(" CurrentImageSize:         " & jpipViewer.CurrentImageSize.ToString()) 
         Debug.WriteLine(" ComponentIndex:           " & jpipViewer.ComponentIndex.ToString()) 
         Debug.WriteLine(" CurrentResolutionIndex:   " & jpipViewer.CurrentResolutionIndex.ToString()) 
 
         jpipViewer.ZoomOut() 
         Debug.WriteLine(Constants.vbLf & " ZoomOut ") 
         Debug.WriteLine(" CurrentImageSize:         " & jpipViewer.CurrentImageSize.ToString()) 
         Debug.WriteLine(" ComponentIndex:           " & jpipViewer.ComponentIndex.ToString()) 
         Debug.WriteLine(" CurrentResolutionIndex:   " & jpipViewer.CurrentResolutionIndex.ToString()) 
 
         jpipViewer.ComponentIndex = -1 
         Debug.WriteLine("Component Index value set to 1 ") 
         Debug.WriteLine(" CurrentImageSize:         " & jpipViewer.CurrentImageSize.ToString()) 
         Debug.WriteLine(" ComponentIndex:           " & jpipViewer.ComponentIndex.ToString()) 
         Debug.WriteLine(" CurrentResolutionIndex:   " & jpipViewer.CurrentResolutionIndex.ToString()) 
 
         jpipViewer.Zoom(jpipViewer.GetResolutionSize(2)) 
         Debug.WriteLine(" Resolution size set to 2") 
         Debug.WriteLine(" CurrentImageSize:         " & jpipViewer.CurrentImageSize.ToString()) 
         Debug.WriteLine(" ComponentIndex:           " & jpipViewer.ComponentIndex.ToString()) 
         Debug.WriteLine(" CurrentResolutionIndex:   " & jpipViewer.CurrentResolutionIndex.ToString()) 
         SaveJpipViewerImageToFile(jpipViewer, CLIENT_SAVED_FILE_NAME) 
 
         'Client side function to delete cached files of type LCCACHE File (Not LTCACHE File) prior to given date from CACHE_DIRECTORY 
         Dim count As Integer = jpipViewer.DeleteCacheFiles(deleteCacheFilePriorTo) 
         Debug.WriteLine(count.ToString() & " Cache File Deleted....") 
 
         If jpipViewer.IsActive Then 
            Debug.WriteLine(" JpipRasterImageViewer.IsActive Test ") 
            Debug.WriteLine(" CurrentImageSize:         " & jpipViewer.CurrentImageSize.ToString()) 
         End If 
 
         jpipViewer.Close() 
 
         If jpipViewer.IsActive Then 
            Debug.WriteLine(" JpipRasterImageViewer.IsActive Test (this should not happen becaue no image is loaded at this point") 
            Debug.WriteLine(" CurrentImageSize:         " & jpipViewer.CurrentImageSize.ToString()) 
         End If 
 
         'Server side 
         StopJpipServer() 
      End Sub 
 
      <TestMethod> 
      Public Sub ClientExample() 
         'Server side 
         StartJpipServer() 
 
         'Client requesting enumerated images from server 
         StartFileEnumerationServer() 
         GetEnumeratedFiles(Path.Combine(LEAD_VARS.ImagesDir, "Client_Enumerated_Images.txt")) 
         StopFileEnumerationServer() 
 
         'Client requests an image, copies to local file, then deletes cached files prior to given date from CACHE_DIRECTORY 
 
         Dim jpipViewer As JpipRasterImageViewer = New JpipRasterImageViewer() 
         SetJpipViewer(jpipViewer) 
         AddHandler jpipViewer.StreamingError, AddressOf OnClientError 
         AddHandler jpipViewer.TotalBytesLoaded, AddressOf OnBytesLoaded 
         AddHandler jpipViewer.FileOpened, AddressOf FileOpened 
         Debug.WriteLine(Constants.vbLf & " Open File:          " & _serverImagesList(0)) 
         jpipViewer.Open(_serverImagesList(0)) 
 
 
      End Sub 
 
      Public NotInheritable Class LEAD_VARS 
      Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
      End Class 
using Leadtools; 
      using Leadtools.Codecs; 
      using Leadtools.Jpip; 
      using Leadtools.Jpip.Client.WinForms; 
      using Leadtools.Jpip.Client.InteractiveDecoder; 
      using Leadtools.Jpip.Server; 
      using Leadtools.Drawing; 
 
      private const string SERVER_NAME = "LEAD JPIP Server - Test Server"; 
      private const int ENUMERATION_SERVER_PORT = 109; 
      private const int JPIP_SERVER_PORT = 107; 
      private const string LOCAL_IP_ADDRESS = "127.0.0.1"; 
      private string CLIENT_CACHE_DIRECTORY = Path.Combine(LEAD_VARS.ImagesDir, "jpeg2000"); 
      private string SERVER_CACHE_DIRECTORY = Path.Combine(LEAD_VARS.ImagesDir, "jpeg2000"); 
      private string SERVER_IMAGES_FOLDER = Path.Combine(LEAD_VARS.ImagesDir, "jpeg2000"); 
      private const string IMAGE_FILE_EXTENSIONS = "*.j2k;*.jp2;*.jpx"; 
      private string CLIENT_SAVED_FILE_NAME = Path.Combine(LEAD_VARS.ImagesDir, "test.bmp"); 
      private JpipServer _jpipServer; 
      private List<string> _imageFileExtensions; 
      private HttpListener _listener; 
      public List<string> _serverImagesList = new List<string>(); 
      public JpipClientExample() 
      { 
#if LEADTOOLS_V175_OR_LATER 
         Leadtools.Examples.Support.SetLicense(); 
#else 
         Leadtools.Examples.Support.Unlock(); 
#endif // #if LEADTOOLS_V175_OR_LATER 
         _imageFileExtensions = new List<string>(); 
         _jpipServer = new JpipServer(); 
      } 
 
      public void ClientRequestReceived(IAsyncResult ar) 
      { 
         HttpListenerContext context; 
 
 
         if (null == _listener ||   !_listener.IsListening) 
         { 
            return; 
         } 
 
         try 
         { 
            context = _listener.EndGetContext(ar); 
         } 
         catch 
         { 
            return; 
         } 
 
         try 
         { 
 
            string formattedImages; 
            byte[] sendBuffer; 
 
            _listener.BeginGetContext(ClientRequestReceived, null); 
 
            formattedImages = GetFormattedServerImagesString(); 
 
            sendBuffer = Encoding.ASCII.GetBytes(formattedImages); 
 
            context.Response.OutputStream.Write(sendBuffer, 0, sendBuffer.Length); 
 
            context.Response.Close(); 
         } 
         catch (Exception) 
         { 
            if (null != context) 
            { 
               context.Response.Close(); 
            } 
         } 
      } 
 
      public string GetFormattedServerImagesString() 
      { 
         string serverImageFile; 
         string formattedServerImagesString = string.Empty; 
         List<string> searchImages = new List<string>(); 
         List<string> serverImages = new List<string>(); 
         foreach (string extension in _imageFileExtensions) 
         { 
            searchImages.AddRange(Directory.GetFiles(_jpipServer.Configuration.ImagesFolder, 
                                                                              extension, 
                                                                              SearchOption.AllDirectories)); 
         } 
         foreach (string file in searchImages) 
         { 
            serverImageFile = file.Replace(_jpipServer.Configuration.ImagesFolder, 
                                                        string.Empty); 
            serverImageFile = serverImageFile.TrimStart('\\'); 
            formattedServerImagesString += serverImageFile + ";"; 
         } 
         searchImages.Clear(); 
         foreach (KeyValuePair<string, string> aliasFolder in _jpipServer.Configuration.AliasFolders) 
         { 
            if (!Directory.Exists(aliasFolder.Value)) 
            { 
               continue; 
            } 
            foreach (string extension in _imageFileExtensions) 
            { 
               searchImages.AddRange(Directory.GetFiles(aliasFolder.Value, 
                                                                extension, 
                                                                SearchOption.AllDirectories)); 
            } 
            foreach (string imageFile in searchImages) 
            { 
               serverImageFile = imageFile.Replace(aliasFolder.Value, aliasFolder.Key); 
               serverImageFile = serverImageFile.TrimStart('\\'); 
               formattedServerImagesString += serverImageFile + ";"; 
            } 
            searchImages.Clear(); 
         } 
         return formattedServerImagesString.TrimEnd(';'); 
      } 
 
      public void StartFileEnumerationServer() 
      { 
         try 
         { 
            _imageFileExtensions.Clear(); 
            _imageFileExtensions.AddRange(IMAGE_FILE_EXTENSIONS.Split(';')); 
 
            if (_listener != null)//if _listner is already created, then do not create again 
               return; 
            _listener = new HttpListener ( ) ; 
            _listener.Prefixes.Add ( string.Format ( "http://{0}:{1}/", LOCAL_IP_ADDRESS, ENUMERATION_SERVER_PORT ) ) ; 
 
            _listener.Start ( ) ; 
            _listener.BeginGetContext ( ClientRequestReceived, null ) ; 
         } 
         catch (Exception ex) 
         { 
            Debug.Fail("Error in server enumeration: \n" + ex.Message); 
         } 
      } 
 
      public void StopFileEnumerationServer() 
      { 
         try 
         { 
            if (_listener != null) 
               _listener.Stop(); 
         } 
         catch (Exception ex) 
         { 
            Debug.Fail("Error in server enumeration: \n" + ex.Message); 
         } 
      } 
 
      public void GetEnumeratedFiles(string filename) 
      { 
         HttpWebRequest request = ( HttpWebRequest ) HttpWebRequest.Create ( string.Format ( "http://{0}:{1}/", LOCAL_IP_ADDRESS, ENUMERATION_SERVER_PORT ) ) ; 
 
         if (null != request.Proxy) 
         { 
            request.Proxy.Credentials = System.Net.CredentialCache.DefaultCredentials; 
         } 
 
         request.UseDefaultCredentials = true; 
 
 
         HttpWebResponse response = (HttpWebResponse)request.GetResponse(); 
 
         System.IO.Stream receivedStream = response.GetResponseStream(); 
         System.IO.StreamReader reader = new System.IO.StreamReader(receivedStream); 
 
         Char[] read = new Char[256]; 
         // Reads 256 characters at a time.     
         int count = reader.Read(read, 0, 256); 
         string imageNames = ""; 
 
         while (count > 0) 
         { 
            // Dumps the 256 characters on a string and displays the string to the console. 
            String temp = new String(read, 0, count); 
 
            imageNames += temp; 
 
            count = reader.Read(read, 0, 256); 
         } 
 
         // Releases the resources of the response. 
         response.Close(); 
         // Releases the resources of the Stream. 
         reader.Close(); 
 
         string[] imageFileNames = imageNames.Split(';'); 
         int counter = 0; 
         foreach (string image in imageFileNames) 
         { 
            counter++; 
            Debug.Assert(image.Trim().Length > 0, "There is no image to enumerate"); 
            Debug.WriteLine("Image " + counter + ": " + image); 
            _serverImagesList.Add(image); 
         } 
 
         File.WriteAllLines(filename, _serverImagesList.ToArray()); 
      } 
 
      public void StartJpipServer() 
      { 
         if (!_jpipServer.IsRunning) 
         { 
            //Server Settings 
            _jpipServer.Configuration.ServerName = SERVER_NAME; 
            _jpipServer.Configuration.IPAddress = LOCAL_IP_ADDRESS; 
            _jpipServer.Configuration.Port = JPIP_SERVER_PORT; 
            _jpipServer.Configuration.ImagesFolder = SERVER_IMAGES_FOLDER; 
            _jpipServer.Configuration.CacheFolder = SERVER_CACHE_DIRECTORY; 
            _jpipServer.Configuration.MaxServerBandwidth = _jpipServer.Configuration.MaxServerBandwidth; 
            _jpipServer.Configuration.CacheSize = 200; 
            _jpipServer.Configuration.DivideSuperBoxes = true; 
            _jpipServer.Configuration.ChunkSize = 512; 
            _jpipServer.Configuration.MaxClientCount = 5; 
            _jpipServer.Configuration.ConnectionIdleTimeout = new TimeSpan(0, 0, 9100); 
            _jpipServer.Configuration.MaxSessionLifetime = new TimeSpan(0, 0, 9900); 
            _jpipServer.Configuration.MaxConnectionBandwidth = _jpipServer.Configuration.MaxConnectionBandwidth; 
            //Communication Settings 
            _jpipServer.Configuration.MaxTransportConnections = 15; 
            _jpipServer.Configuration.HandshakeTimeout = new TimeSpan(0, 0, 9600); 
            _jpipServer.Configuration.RequestTimeout = new TimeSpan(0, 0, 920); 
            _jpipServer.Configuration.ChunkSize = 512; 
            //Images Settings 
            _jpipServer.Configuration.ImageParsingTimeout = new TimeSpan(0, 0, 9180); 
            _jpipServer.Configuration.PartitionBoxSize = 40; 
            _jpipServer.Configuration.DivideSuperBoxes = true; 
            //Logging Settings 
            _jpipServer.Configuration.LogInformation = false; 
            _jpipServer.Configuration.LogWarnings = false; 
            _jpipServer.Configuration.LogDebug = false; 
            _jpipServer.Configuration.LogErrors = false; 
            //Start server and delegates 
            _jpipServer.Start(); 
            Debug.Assert(_jpipServer.IsRunning, "Server did not start."); 
         } 
      } 
 
      public void StopJpipServer() 
      { 
         if (_jpipServer.IsRunning) 
            _jpipServer.Stop(); 
      } 
 
      public void SetJpipViewer(JpipRasterImageViewer viewer) 
      { 
         // Initialize JPIP viewer   
         viewer.CacheDirectoryName = CLIENT_CACHE_DIRECTORY; 
         viewer.PortNumber = JPIP_SERVER_PORT; 
         viewer.IPAddress = LOCAL_IP_ADDRESS; 
         viewer.PacketSize = 16384; 
         viewer.RequestTimeout = new TimeSpan(0, 1, 0); 
         viewer.ChannelType = JpipChannelTypes.HttpChannel; 
      } 
 
      public void SaveJpipViewerImageToFile(JpipRasterImageViewer viewer, string fileName) 
      { 
         RasterCodecs rc = new Leadtools.Codecs.RasterCodecs(); 
         rc.Save(viewer.Image, fileName, RasterImageFormat.Bmp, 24); 
      } 
 
      private void OnClientError(object sender, ErrorEventArgs e) 
      { 
         Debug.WriteLine(e.GetException().Message); 
      } 
 
      private void OnBytesLoaded(object sender, TotalBytesLoadedEventArgs e) 
      { 
         Debug.WriteLine(" Total Bytes: " + e.ByteCount.ToString()); 
      } 
 
      [TestMethod] 
      public void ClientExample() 
      { 
         /*Server side*/ 
         StartJpipServer(); 
 
         /*Client requesting enumerated images from server*/ 
         StartFileEnumerationServer(); 
         GetEnumeratedFiles(Path.Combine(LEAD_VARS.ImagesDir, "Client_Enumerated_Images.txt")); 
         StopFileEnumerationServer(); 
 
         JpipRasterImageViewer jpipViewer = new JpipRasterImageViewer(); 
         SetJpipViewer(jpipViewer); 
         jpipViewer.StreamingError += OnClientError; 
         jpipViewer.TotalBytesLoaded += OnBytesLoaded; 
         jpipViewer.FileOpened += new EventHandler(jpipViewer_FileOpened); 
 
         Debug.WriteLine("\n Open File:          " + _serverImagesList[0] ); 
         jpipViewer.Open(_serverImagesList[0]); 
      } 
 
      void jpipViewer_FileOpened(object sender, EventArgs e) 
      { 
         JpipRasterImageViewer jpipViewer = ( JpipRasterImageViewer) sender ; 
 
         /*Client requests an image, copies to local file, then deletes cached files prior to given date from CACHE_DIRECTORY*/ 
         DateTime deleteCacheFilePriorTo = new DateTime(2008, 8, 8); 
 
         Debug.WriteLine("\n FullImageSize:          " + jpipViewer.FullImageSize.ToString()); 
         Debug.WriteLine(" NumberOfColorComponents:  " + jpipViewer.NumberOfColorComponents.ToString()); 
         Debug.WriteLine(" NumberOfResolutions:      " + jpipViewer.NumberOfResolutions.ToString()); 
         Debug.WriteLine(" InteractiveMode:          " + jpipViewer.InteractiveMode.ToString()); 
         Debug.WriteLine(" PaintProperties:          " + jpipViewer.PaintProperties.ToString()); 
         Debug.WriteLine(" current CodeStreamIndex       " + jpipViewer.CodeStream ); 
         Debug.WriteLine(" NumberOfCodeStreams       " + jpipViewer.CodeStreamCount ) ; 
         Debug.WriteLine(" Available Resolutions"); 
         for (int i = 0; i < jpipViewer.NumberOfResolutions; i++) 
         { 
            Debug.WriteLine(" Resolution (" + i.ToString() + ") Size" + jpipViewer.GetResolutionSize(i).ToString()); 
         } 
         Debug.WriteLine("\nOpen Image"); 
         Debug.WriteLine(" CurrentImageSize:         " + jpipViewer.CurrentImageSize.ToString()); 
         Debug.WriteLine(" ComponentIndex:           " + jpipViewer.ComponentIndex.ToString()); 
         Debug.WriteLine(" CurrentResolutionIndex:   " + jpipViewer.CurrentResolutionIndex.ToString()); 
 
         jpipViewer.ZoomIn(); 
         Debug.WriteLine("\n Zoomed in"); 
         Debug.WriteLine(" CurrentImageSize:         " + jpipViewer.CurrentImageSize.ToString()); 
         Debug.WriteLine(" ComponentIndex:           " + jpipViewer.ComponentIndex.ToString()); 
         Debug.WriteLine(" CurrentResolutionIndex:   " + jpipViewer.CurrentResolutionIndex.ToString()); 
 
         jpipViewer.ZoomIn(); 
         Debug.WriteLine("\n Zoomed in"); 
         Debug.WriteLine(" CurrentImageSize:         " + jpipViewer.CurrentImageSize.ToString()); 
         Debug.WriteLine(" ComponentIndex:           " + jpipViewer.ComponentIndex.ToString()); 
         Debug.WriteLine(" CurrentResolutionIndex:   " + jpipViewer.CurrentResolutionIndex.ToString()); 
 
         jpipViewer.ComponentIndex = 0; 
         Debug.WriteLine("Component Index value set to 1 "); 
         Debug.WriteLine(" CurrentImageSize:         " + jpipViewer.CurrentImageSize.ToString()); 
         Debug.WriteLine(" ComponentIndex:           " + jpipViewer.ComponentIndex.ToString()); 
         Debug.WriteLine(" CurrentResolutionIndex:   " + jpipViewer.CurrentResolutionIndex.ToString()); 
 
         jpipViewer.ZoomOut(); 
         Debug.WriteLine("\n ZoomOut "); 
         Debug.WriteLine(" CurrentImageSize:         " + jpipViewer.CurrentImageSize.ToString()); 
         Debug.WriteLine(" ComponentIndex:           " + jpipViewer.ComponentIndex.ToString()); 
         Debug.WriteLine(" CurrentResolutionIndex:   " + jpipViewer.CurrentResolutionIndex.ToString()); 
 
         jpipViewer.ComponentIndex = -1; 
         Debug.WriteLine("Component Index value set to 1 "); 
         Debug.WriteLine(" CurrentImageSize:         " + jpipViewer.CurrentImageSize.ToString()); 
         Debug.WriteLine(" ComponentIndex:           " + jpipViewer.ComponentIndex.ToString()); 
         Debug.WriteLine(" CurrentResolutionIndex:   " + jpipViewer.CurrentResolutionIndex.ToString()); 
 
         jpipViewer.Zoom(jpipViewer.GetResolutionSize(2)); 
         Debug.WriteLine(" Resolution size set to 2"); 
         Debug.WriteLine(" CurrentImageSize:         " + jpipViewer.CurrentImageSize.ToString()); 
         Debug.WriteLine(" ComponentIndex:           " + jpipViewer.ComponentIndex.ToString()); 
         Debug.WriteLine(" CurrentResolutionIndex:   " + jpipViewer.CurrentResolutionIndex.ToString()); 
         SaveJpipViewerImageToFile(jpipViewer, CLIENT_SAVED_FILE_NAME ); 
 
         /*Client side function to delete cached files of type LCCACHE File (Not LTCACHE File) prior to given date from CACHE_DIRECTORY*/ 
         int count = jpipViewer.DeleteCacheFiles(deleteCacheFilePriorTo); 
         Debug.WriteLine(count.ToString() + " Cache File Deleted...."); 
 
         if (jpipViewer.IsActive) 
         { 
            Debug.WriteLine(" JpipRasterImageViewer.IsActive Test "); 
            Debug.WriteLine(" CurrentImageSize:         " + jpipViewer.CurrentImageSize.ToString()); 
         } 
 
         jpipViewer.Close(); 
 
         if (jpipViewer.IsActive) 
         { 
            Debug.WriteLine(" JpipRasterImageViewer.IsActive Test (this should not happen becaue no image is loaded at this point"); 
            Debug.WriteLine(" CurrentImageSize:         " + jpipViewer.CurrentImageSize.ToString()); 
         } 
 
         /*Server side*/ 
         StopJpipServer(); 
      } 
 
      static class LEAD_VARS 
      { 
      public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
      }

Requirements

Target Platforms

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© 1991-2017 LEAD Technologies, Inc. All Rights Reserved.
Leadtools.Jpip.Client.WinForms Assembly
Introduction
Getting Started
Namespaces
Leadtools.Jpip.Client.WinForms Namespace
Classes
CodeStreamRequestEventArgs
JpipRasterImageViewer
Members
JpipRasterImageViewer Constructor
Methods
Properties
Events
ProgressStatusUpdatedEventArgs
ResolutionChangedEventArgs
Enumerations
Assemblies
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