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When you have an existing distributed application with client and server pieces using DCOM to communicate between them, it s usually impractical to re-architect and re-write the application using XML messaging At a minimum, replacing DCOM with messaging requires major changes and additions to the server to receive and process incoming XML documents and send responses as outgoing XML documents Additionally, the client must be re-written to format and send requests as XML documents and receive and parse responses These changes are small compared to the major change in programming model that developers must learn and adopt Developers writing the client no longer instantiate a server object and call its methods passing them parameters and getting back a return value, instead they must somehow serialize all data to XML to send the request, then deserialize data from XML upon receiving the response Finally, if the existing application architecture does not lend itself to messaging, by using stateful server objects for example, then a major re-architecture and/or some custom SOAP extensions are needed to replace DCOM with SOAP messaging To ease converting existing applications from DCOM to SOAP, you can write a layer on the client side that acts as the Web service proxy As a proxy, this layer would give the client the impression that it s calling methods on a server object The proxy would be responsible for serializing the parameters to XML, sending them as parts of a SOAP message, then parsing and deserializing the response message and returning data to the client in native data types such as strings, integers, and arrays On the server side, you would write another layer that is responsible for receiving SOAP messages, deserializing their content to native data types, instantiating the server COM component and invoking the appropriate method, then serializing the return value and sending back a SOAP response The proxy layer needs to communicate specific information about the RPC call to the server, such as the intended object, a method name, the name of each parameter, and of course the value or content of each parameter Similarly, the server needs to communicate back the return value and the output value of all in/out (ByRef) parameters If you write both of these layers, you can communicate this information in any format you like as long as both layers agree on the format However, if you are exposing the server side as a public Web service and many clients will have to communicate with it, then all clients and the service must use a common format for communicating this information Section 7 of the SOAP specification defines a standard format for communicating this information when using SOAP for RPC The SOAP specification also defines a standard way of serializing/deserializing native application types such as strings, arrays, and structures, which is especially important to enable interoperation among clients and servers This standard serialization format is commonly called Section 5 encoding after the SOAP specification section where it is defined (I ll explain SOAP Section 5 encoding later in this chapter) According to the SOAP specification, you can use SOAP for RPC (aka Section 7) without necessarily using the standard Section 5 encoding, ie you can serialize your data in any format you like while still using SOAP for RPC Practically however, it makes sense to use Section 5 encoding format when using RPC, especially when you care about interoperability, because most SOAP stacks and tools, such as the Microsoft SOAP Toolkit, the NET Framework, and many others combine RPC with Section 5 encoding In this section I will show you an example of using SOAP for RPC with a VB 6 client that uses data binding to show a list of orders in a data grid for the selected employee (see Figure 3-8) The grid is bound to a Recordset returned from invoking a remote COM component using DCOM I ve replaced DCOM with SOAP and implemented a simple proxy as a VB 6 class with its DataSourceBehavior set to vbDataSource so that the data grid can bind to an instance of this proxy class. how to edit pdf file in asp net c# Read, Edit and manipulate PDF documents in C# windows application ...
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Rating 3.6 stars (9) On the server side, I added a stub layer written as a simple ASP page that receives the SOAP message, invokes the COM component then serializes and returns the Recordset The server COM component did not have to change at all The client had to change to bind to the proxy class instead of directly to a Recordset, this change required exactly 3 lines of code The existing server-side COM component is called RecordsetExample and exposes a method called GetEmpOrders which takes in an employee id and queries the Northwind Orders table for all orders with the given employee id and returns the result in an ADO Recordset: Public Function GetEmpOrders(ByVal EmpId As Long) As Recordset To expose the COM component as a Web service, I wrote the ASP page shown in Listing 3- 7 which uses only MSXML 40 and ADO 26 birt upc-a, upc-a barcode font for word, word 2010 ean 13, how to use barcode add-in for word and excel 2010, word pdf 417, birt ean 13 pdf editor in c# ASP.NET PDF Text Edit Control: online edit PDF text content using ...
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In this C# tutorial you will learn to modify an existing PDF document by adding more ... iTextSharp libray assists you to accomplish this task through the use of the ... The central abstraction of the MIDP user interface is class Displayable Class Displayable helps organize the user interface into manageable pieces This results in user interfaces that are easy to use and learn Each MIDP application has a Display on which a single Displayable object is shown The application sets and resets the current Displayable object on the Display for each step of the task, based on user interactions The user tasks (interactions with the user interface) are implemented using Command objects The application is notified automatically when a Command is selected by the user As a result of these notifications the application often changes the current Displayable to some other Displayable The device software manages the sharing of the physical display between the native applications and the MIDP applications Listing 3-7 An ASP page to expose an existing COM component as a Web service (VBWSBook\3 \EmployeeOrders\EmpOrdersasp) If you have worked with replication, you know that prior planning and design are important First-time replicators often think that having the same data in two places and needing to keep that data in sync is an easy task But consider just two examples of the unexpected complexity involved in replication NS="http://schemaslearnxmlwscom/employeeOrders" Set requestDoc=ServerCreateObject("MSXML2DOMDocument") 'Load the SOAP message requestDocasync=false If Not requestDocLoad(Request) Then ResponseWrite "Error loading request doc " & ErrDescription ResponseEnd Else Call requestDocsetProperty("SelectionNamespaces", _ "xmlns:vbws='" & NS & "'") End If The rationale behind the displayable-oriented approach is based on the wide variations in display and keypad configurations found in MIDP devices Each device provides a consistent look and feel by handling the component layout, painting, scrolling, and focus traversal If an application needed to be aware of these details, portability would be difficult to achieve, and smooth integration with the look and feel of the device and its native applications would place a heavy burden on application developers itextsharp edit existing pdf c# Open, edit , save pdf file c# | The ASP.NET Forums
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