code 128 barcode generator asp.net System.Runtime.Remoting.Channels.Http.HttpChannel System.Runtime.Remoting.Channels.Tcp.TcpChannel in VB.NET

Printing Code-128 in VB.NET System.Runtime.Remoting.Channels.Http.HttpChannel System.Runtime.Remoting.Channels.Tcp.TcpChannel

System.Runtime.Remoting.Channels.Http.HttpChannel System.Runtime.Remoting.Channels.Tcp.TcpChannel
Generate Code128 In VB.NET
Using Barcode drawer for .NET framework Control to generate, create Code128 image in Visual Studio .NET applications.
www.OnBarcode.com
Scanning Code 128A In VB.NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
HttpChannel sends messages over HTTP, while TcpChannel sends messages using TCP sockets. By default, the HttpChannel class encodes messages using Simple Object Access Protocol (SOAP), whereas the TcpChannel class uses a binary stream. In most cases, TcpChannel offers better performance because encoding and decoding SOAP messages can be a time-consuming process. On the other hand, SOAP forms the basis for XML Web services and allows clients and servers on different platforms written in different languages to communicate seamlessly. Both the HttpChannel and TcpChannel classes are convenience wrappers around unidirectional channels; HttpChannel combines HttpServerChannel and HttpClientChannel; TcpChannel combines TcpServerChannel and TcpClientChannel.
Paint Bar Code In Visual Basic .NET
Using Barcode printer for .NET Control to generate, create barcode image in .NET framework applications.
www.OnBarcode.com
Bar Code Reader In Visual Basic .NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Caution
USS Code 128 Encoder In Visual C#
Using Barcode drawer for VS .NET Control to generate, create Code 128C image in Visual Studio .NET applications.
www.OnBarcode.com
USS Code 128 Creation In VS .NET
Using Barcode encoder for ASP.NET Control to generate, create Code-128 image in ASP.NET applications.
www.OnBarcode.com
Although HttpChannel and TcpChannel both rely on TCP/IP for communication, messages sent from one kind of channel cannot be processed by the other because TcpChannel uses binary and HttpChannel uses text. It's important to ensure that messages are sent and received by the same type of channel.
Create Code 128A In VS .NET
Using Barcode generation for .NET Control to generate, create Code 128 image in .NET applications.
www.OnBarcode.com
Barcode Printer In Visual Basic .NET
Using Barcode creator for Visual Studio .NET Control to generate, create bar code image in Visual Studio .NET applications.
www.OnBarcode.com
15. Remoting
Denso QR Bar Code Drawer In Visual Basic .NET
Using Barcode generation for .NET framework Control to generate, create QR Code JIS X 0510 image in Visual Studio .NET applications.
www.OnBarcode.com
Linear Drawer In Visual Basic .NET
Using Barcode creator for Visual Studio .NET Control to generate, create Linear 1D Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Creating a Channel
Painting Bar Code In Visual Basic .NET
Using Barcode creation for .NET Control to generate, create barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Make Code 11 In Visual Basic .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create USD8 image in .NET applications.
www.OnBarcode.com
Both HttpChannel and TcpChannel offer the same overloaded constructors as detailed in Table 15-2.
Barcode Decoder In VB.NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
UCC-128 Generation In None
Using Barcode creation for Microsoft Word Control to generate, create UCC - 12 image in Microsoft Word applications.
www.OnBarcode.com
Table 15-2. Channel Constructors
Recognizing PDF417 In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
EAN 128 Creation In Java
Using Barcode creator for Eclipse BIRT Control to generate, create UCC.EAN - 128 image in BIRT applications.
www.OnBarcode.com
Constructor HttpChannel() TcpChannel()
Printing GS1 - 13 In Java
Using Barcode generation for BIRT Control to generate, create EAN13 image in BIRT applications.
www.OnBarcode.com
Generate UPC Symbol In .NET Framework
Using Barcode generator for Reporting Service Control to generate, create UPC A image in Reporting Service applications.
www.OnBarcode.com
Description Creates a channel using default values. Locates an available port and binds to it. Creates only a client-side channel (that is, this channel cannot be used to publish remoting services). Creates a channel that binds to the specified port number.Creates a channel that can be used to initiate client requests and publish object services. Using 0 (zero) as a port number allows the channel to select an unused port at random and bind to it. Creates a channel that is configured by the entries in IDictionary and that uses the specified sinks for processing outbound and inbound messages. If either of the sink provider arguments is set to null, the default providers will be used instead.
Generate Bar Code In None
Using Barcode generator for Font Control to generate, create barcode image in Font applications.
www.OnBarcode.com
Generate Bar Code In VS .NET
Using Barcode maker for Reporting Service Control to generate, create barcode image in Reporting Service applications.
www.OnBarcode.com
HttpChannel(int) TcpChannel(int)
HttpChannel(IDictionary, IClientChannelSinkProvider, IServerChannelSinkProvider) TcpChannel(IDictionary, IClientChannelSinkProvider, IServerChannelSinkProvider)
Using the default constructor creates a channel that is suitable only for remoting clients. Requests can be initiated through the channel, but services cannot be published. If a channel is created with any other constructor, it is able to initiate client requests as well as listen for inbound messages, allowing an application to publish a service for clients and consume services from elsewhere. The last constructor in the list allows for the greatest control over the channel. Setting aside the sink provider, which is outside the scope of this book, the properties contained in IDictionary can be used to configure a channel before it's used. Most of the channel properties are outside the scope of this book and relate to advanced remoting operations. The only relevant property for this section is port, which applies only to server channels, those channels that can be used to publish an object service. Here's an example of creating a channel using the port property:
IDictionary x_props = new Hashtable(); x_props["port"] = "20172"; HttpChannel x_channel = new HttpChannel(x_props, null, null);
This is equivalent to
15. Remoting HttpChannel x_channel = new HttpChannel(20172);
Important
The properties of a channel are accessible via the Properties property. Changing the value of these properties has no effect on the channel configuration. Properties must be defined and passed in via the constructor.
Registering a Channel
A channel cannot be used until it's registered. At least one channel must be registered before remoting operations can be performed. Channels are registered in the following way:
ChannelServices.RegisterChannel(mychannel);
The ChannelServices class is used to register, unregister, and locate channels. Once a channel has been registered, it becomes available for use. A channel can be withdrawn from use with the UnregisterChannel method of the ChannelServices class.
Using More than One Channel
Applications can register more than one channel; for example, a server application can offer services via HTTP and TCP. Different types of clients can have different network requirements, and the programmer can decide which channel is best suited to the task at hand. The HttpChannel class is better suited to clients that are located on different networks. Using SOAP over HTTP makes traversing Internet proxies easier, and the HttpChannel class provides specific support for using proxies. By contrast, TcpChannel uses a binary encoding that is transmitted directly using sockets. This combination of format and transport is less likely to pass through proxies, but it does offer a performance advantage. For applications that need to offer a service to both internal and external clients, multiple concurrent channels give the best of both worlds, providing compatibility for remote clients and performance for local clients. Here's a variation of the Start class from the preceding example, shown without the necessary using statements, which registers both a TcpChannel and an HttpChannel. The changes are marked in boldface:
class Start { static void Main(string[] p_args) { // create the count server instance CountServer x_server = new CountServer(); // create and register the channel HttpChannel x_channel = new HttpChannel(20172); ChannelServices.RegisterChannel(x_channel);
15. Remoting // create the tcp channel TcpChannel x_tcp_channel = new TcpChannel(20173); ChannelServices.RegisterChannel(x_tcp_channel); // register the count server for remoting RemotingConfiguration.RegisterWellKnownServiceType( typeof(CountServer), "CountServer", WellKnownObjectMode.Singleton); Console.WriteLine("Press return to exit."); Console.ReadLine(); } }
We can now redefine the client-side InitRemoteServer method to use TCP as follows:
private void InitRemoteServer() { RemotingConfiguration.RegisterWellKnownClientType( typeof(CountServer), "tcp://localhost:20173/CountServer"); }
Notice that the protocol scheme for the client URL has changed to tcp. Using the HttpChannel class requires clients to use the http scheme, while the TcpChannel class requires the tcp scheme. Using the wrong scheme (for example, tcp for a URL that should map to an HttpChannel) will result in an exception at run time. Clients with this new definition can coexist alongside the original version without any problems. The appropriate channel will receive requests, and the object that is targeted by a remote request is not aware of which protocol and transport were used. Multiple instances of the same type of channel can also coexist, although care must be taken to ensure that the remoting system can tell them apart. This is achieved using the name property. The following example demonstrates how to create two channels of the same type with different names:
using using using using System.Collections; System.Runtime.Remoting.Channels; System.Runtime.Remoting.Channels.Tcp; System.Runtime.Remoting.Channels.Http;
public class MultipleChannelTest { public MultipleChannelTest() { IDictionary x_props1 = new Hashtable(); x_props1["port"] = "20174"; x_props1["name"] = "http-20174"; HttpChannel x_channel1 = new HttpChannel(x_props1, null, null); ChannelServices.RegisterChannel(x_channel1); IDictionary x_props2 = new Hashtable(); x_props2["port"] = "20175"; x_props2["name"] = "http-20175"; HttpChannel x_channel2 = new HttpChannel(x_props2, null, null);
15. Remoting ChannelServices.RegisterChannel(x_channel2);
public static void Main() { new MultipleChannelTest(); } }
Channels have a default name, which is http for instances of HttpChannel and tcp for TcpChannel. The naming scheme is left to the programmer to define; any valid string value can be used. To create multiple channels of the same type without unique names, the name property should be set to the empty string, which allows any number of channels to be registered without conflict. For clarity, however, we recommend using meaningful names.
Copyright © OnBarcode.com . All rights reserved.