create and print barcode c# Advanced Topics in Visual Studio .NET

Printer QR in Visual Studio .NET Advanced Topics

Advanced Topics
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Also, notice that you neither need to reference additional DLLs nor add Imports state ments. It makes no difference to the Calculator object that it will be accessed remotely. Except for the Inherits keyword, a remotable class looks exactly like a regular .NET class. Remember to compile the RemoteComponents project before continuing, as you need to reference its assembly from both the host and the client applications.
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The Host Application
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You can develop and test the host application in the same Microsoft Visual Studio .NET solution that contains the RemoteComponent project. This process simplifies debug ging. Create a new Console application, name it ServerApp, and add a reference to the RemoteComponents project. The host application uses types in the System.Run time.Remoting assembly, so you must add a reference to that DLL and include a few Imports statements:
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Imports Imports Imports Imports Imports System.Runtime.Remoting
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System.Runtime.Remoting.Channels
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System.Runtime.Remoting.Channels.Tcp
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System.Runtime.Remoting.Channels.Http
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RemoteComponents
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Module Module1
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Sub Main() Console.WriteLine( Starting ServerApp... ) Create and register a TCP server channel that listens to port 50000. Dim channel As New TcpChannel(50000) ChannelServices.RegisterChannel(channel) Create and publish the Calculator object.
Dim calc As New Calculator
RemotingServices.Marshal(calc, calculator.rem )
Wait until the operator terminates the program.
Console.ReadLine()
Unregister the channel. (Optional in this demo.)
ChannelServices.UnregisterChannel(channel)
End Sub End Module
Before it can expose an object through remoting, the host application must create and register a server TCP channel. The constructor of this class takes the port number that you want to associate with the channel, as shown in previous code:
Dim channel As New TcpChannel(50000) ChannelServices.RegisterChannel(channel)
You should use a port number equal to or higher than 1024 to avoid clashes with ports used by common protocols such as HTTP (port 80) or FTP (port 21). Even better, you should use a number equal to or higher than 48152 to stay clear of ports used by other commercial software such as SQL Server (port 1433).
32:
Remoting
Next, the host application creates an instance of the Calculator class and makes it available for remoting as a singleton SAO by calling the Marshal shared method of the RemotingServices class:
Dim calc As New Calculator RemotingServices.Marshal(calc, calculator.rem )
The second argument is the URI at which clients can request the object. For example, if the IP address of the server machine is 192.168.0.212 and you ve chosen a port num ber equal to 50000, the published Calculator object can be reached at this address:
tcp://192.168.0.212:50000/Calculator.rem
If the server machine has a name, you can use it in lieu of the IP address, as in this code:
tcp://www.vb2themax:50000/Calculator.rem
And of course you can use localhost if the client and the host application are running on the same computer:
tcp://localhost:50000/Calculator.rem
The URI doesn t require an extension, but it is advisable that you use a URL that ends with .rem or .soap, because IIS recognizes these extensions. This means that you can later decide to host these objects inside IIS without having to modify remote clients.
The Client Application
Start another instance of Visual Studio .NET on the same or a different machine and create a new Windows Forms project. The client application needs to interact with .NET remoting services, so you must add a reference to the System.Runtime.Remoting assembly and include the same Imports statements you used for the host application. The client application must also have a reference to the RemoteComponents.dll assem bly, which is necessary to declare a strongly typed variable of the Calculator type. Drop a button on the default Form1 form, name it btnAdd, and write this code in its Click event handler:
Connect to the remote object (running on local computer in this demo).
Dim url As String = tcp://localhost:50000/calculator.rem"
Dim calc As Calculator = DirectCast(RemotingServices.Connect( _
GetType(Calculator), url), Calculator) Invoke the Add method and display its return value.
Dim result As Double = calc.Add(11, 22)
Call GetProcessID to prove that the object is running in another process.
MsgBox( Result is & result.ToString, MsgBoxStyle.Information, calc.GetProcessID)
As I ve explained previously, the URL to the remote object is formed by combining the protocol (tcp: or http:), the server name or address, the port number, and the URI string (as specified in the host application).
Part VII:
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