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On Error GoTo eh vbwsServiceUrl = SERVICE_URL vbwsSoapAction = """""" vbwsWriteBodyXml docdocumentElementxml vbwssend If Not docloadXML(vbwsGetResponseString) Then MsgBox "Error loading response document " & vbCrLf & _ docparseErrorreason & vbCrLf & "Response document is" & vbCrLf & _ vbwsGetResponseString(), vbCritical Exit Sub Else MsgBox "Response is " & vbwsGetResponseString End If
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Exit Sub eh: MsgBox "Error sending invoice document" & vbCrLf & ErrDescription End Sub
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To send the invoice document, I first load it into a DOMDocument called doc using docLoad I then create a SOAPSender object and set its ServiceUrl property to point to the URL of my ASP page I also set its SoapAction property to a pair of double quotes (the equivalent of an empty SOAPAction) since this Web service does not rely on SOAPAction I then call its WriteBodyXml method passing it the invoice document s XML WriteBodyXml simply takes the XML you give it and stuffs it as the content of the <soapenv:Body> element To send the invoice document, I simply call Send then retrieve the response using SOAPSender s GetResponseString method which returns the entire response as a string Because this example uses messaging, the client is not designed as if invoking a method on a remote object, instead, it is sending a document to a remote recipient This is the key distinction between messaging and RPC As you can see, once you know some SOAP fundamentals, the client and service code are straightforward and do not require a special SOAP tool This is especially true for document/literal SOAP messages as there message payload can be any XML document If you re building data exchange or business-to-business integration Web services, you should design them using document/literal You can then implement them using any technology or toolset you like including rolling your own like I showed you here
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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
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