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					An Introduction To XML SOAP Using ASP and VB6
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Article Index: 1. An Introduction To XML SOAP Using ASP and VB6 2. Step By Step 3. The Server 4. VB Client Code 5. Conclusion

An Introduction To XML SOAP Using ASP and VB6 ( Page 1 of 5 ) Using ASP and VB6 but still haven't come to grips with SOAP? In this article the ComponentSource team show us how to create a request/respose system in next to no time using simple VBScript and MSXML.SOAP – Simple Object Access Protocol – is the hottest thing in XML development right now. It has a major role to play in Microsoft's next generation of Visual Studio, and it is the basis of their ".NET" strategy. If you're looking to write a bullet-proof SOAP service in VB6, then look no further than Microsoft's SOAP toolkit for VB; but if you really want to understand what SOAP is all about, then you need to get under the hood, and start building your own objects around the SOAP standard. This article aims to get you started. In the article, we will create a simple SOAP service, and a client to access that service. The service will be in the form of an Active Server Page, which I have called soap.asp - it will need to live in the root directory of your Personal Web Service (by default c:\inetpub\wwwroot) Our service will accept and process SOAP requests made by our client – a VB exe, with a single module, and a start-up Sub Main(). Next: Step By Step >>

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An Introduction To XML SOAP Using ASP and VB6
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Article Index: 1. An Introduction To XML SOAP Using ASP and VB6 2. Step By Step 3. The Server 4. VB Client Code 5. Conclusion

An Introduction To XML SOAP Using ASP and VB6 - Step By Step ( Page 2 of 5 ) As we know, SOAP is a call-response mechanism, which operates in a client-server paradigm. The client (your application) makes a call to the server (a web server, somewhere on the internet), passing in parameters; and the server provides a response. Both call and response are transported in the form of XML documents. Therefore, to build our own example SOAP system, we need both a client and a server – a caller and a responder. The example we will follow is a very simple one: we will build a service that will calculate the tax due on a sales transaction. In traditional VB terms well will create a function with the following definition: Public Function GetSalesTax(ByVal pSalesTotal As Double) as Double GetSalesTax = pSalesTotal * 0.04 End Function Crude, but effective (if you live in a state where the sales tax rate is 4%!) This function defines a method name (GetSalesTax), a parameter (pSalesTotal – representing the total value of the sale) and a return value (the result of the function). In more traditional object-oriented terms, we might think of pSalesTotal as an "IN" parameter, and the GetSalesTax result as an "OUT" parameter. Quite straightforwardly: sales-total in; sales-tax out. A SOAP service can be thought of in terms of "IN" and "OUT" parameters – the client passes "IN" parameters to the server, and then receives the "OUT" parameters in return. So, in order to create our SOAP service, we need a server that will listen for requests to GetSalesTax, accompanied by "IN" parameters, and which will respond with "OUT" parameters, indicating the correct tax amount. Let's start with the

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An Introduction To XML SOAP Using ASP and VB6

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client – the caller. How do we call the SOAP service to make our request. The Client In traditional VB terms, our request to the GetSalesTax function described above, would be something such as: dblSalesTax = GetSalesTax(100) Returning a value of $4. If the GetSalesTax function was contained within an external object, such as an MTS server, then the call would need to reference the server DLL: Dim objTax As New CTaxCalc dblSalesTax = objTax.GetSalesTax(100 In a SOAP system the call is little different, only the request is formatted as an XML document, which is passed up to the server. The appropriate document contains the same details as the MTS call –a method to call, and the parameter name and value. <GetSalesTax> <SalesTotal>100</SalesTotal> <GetSalesTax> In order to ensure that the server can correctly identify and decrypt this method call, it is wrapped up in a larger document, called a SOAP envelope, which references the universal name-space of the SOAP envelope standard. <SOAP:Envelope xmlns:SOAP="urn:schemas-xmlsoap-org:soap.v1"> <SOAP:Header></SOAP:Header> <SOAP:Body> <GetSalesTax> <SalesTotal>100</SalesTotal> <GetSalesTax> </SOAP:Body> </SOAP:Envelope> Finally, to complete our SOAP request document, we will add a name-space reference to our method call, which points to the object which contains the method – the equivalent of the object declaration (Dim objTax As New CTaxCalc) in our MTS method call. <SOAP:Envelope xmlns:SOAP="urn:schemas-xmlsoap-org:soap.v1"> <SOAP:Header></SOAP:Header> <SOAP:Body> <m:GetSalesTax xmlns:m="urn:myserver/soap:TaxCalc"> <SalesTotal>100</SalesTotal> </m:GetSalesTax> </SOAP:Body> </SOAP:Envelope> Now that we have built our SOAP request document, we are ready to send it to the server. The request is a simple HTTP post - just like posting a web form in your internet browser. Of course, your internet browser masks all the complexity of sending a form to a server; and in the longer-term .NET will mask this process from your VB code too. But for now, we need to do the job ourselves; and I have been using Microsoft's XML HTTP Request object to give me a helping hand. (The XMLHTTPRequest is an object within the MSXML class library (MSXML.DLL), and it comes with IE5.) Assuming that strEnvelope contains the XML document described above, the request is formatted thus: Dim objHTTP As New MSXML.XMLHTTPRequest
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An Introduction To XML SOAP Using ASP and VB6

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Dim strEnvelope As String 'Set up to post to our localhost server objHTTP.open "post", "http://localhost/soap/soap.asp" 'Set a standard SOAP/ XML header for the content-type objHTTP.setRequestHeader "Content-Type", "text/xml" 'Set a header for the method to be called objHTTP.setRequestHeader "SOAPMethodName", _ "urn:myserver/soap:TaxCalc#GetSalesTax" 'Make the SOAP call objHTTP.send strEnvelope 'Get the return value strReturn = objHTTP.responseBody Now that we have sent our request, we move to the server, to see how we set up a SOAP service to listen and respond to our calls. Next: The Server >>
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Article Index: 1. An Introduction To XML SOAP Using ASP and VB6 2. Step By Step 3. The Server 4. VB Client Code 5. Conclusion

An Introduction To XML SOAP Using ASP and VB6 - The Server ( Page 3 of 5 ) Our server needs to be configured to accept the HTTP post sent by the client. It will be noted that we direct the client's post to a URL on our local server – http://localhost/soap.asp. So our first job is to create this page, to listen for, and process, SOAP calls to our server. We know that our ASP will receive an XML document, in the form of an HTTP post, with a method name (GetSalesTax), and a parameter (SalesTotal). So, to write our basic listener service, all we need do is deconstruct the body of the request (the SOAP envelope) and pull out the value of the SalesTotal parameter. The SOAP envelope posted by the client is contained in the body of the request, or in ASP terms the Request object; and because it is XML, we can load it into an instance of Microsoft's XMLDOM in our ASP. Soap.asp begins like this: Set objReq = Server.CreateObject("Microsoft.XMLDOM") objReq.Load Request Thus objReq contains the SOAP envelope we created on the client, and we can extract the value of the SalesTotal parameter by running an XSL pattern query, using the SelectSingleNode method of the XML DOM object: strQuery = "SOAP:Envelope/SOAP:Body/m:GetSalesTax/SalesTotal" varSalesTotal = objReq.SelectSingleNode(strQuery).Text With the parameter extracted, we can make our calculation to get the sales-tax: varSalesTax = varSalesTotal * 0.04

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Now we have the return value for sales-tax – the response - ready to pass back to the client, but as with the request, we need to format this response correctly, in order to comply with the SOAP standard. The SOAP response envelope conforms to a format-type identical to the request. The only difference is that the "IN" parameter (SalesTotal, in our case) is replaced by an "OUT" parameter – SalesTax, and the method name indicates that the document is a response: <SOAP:Envelope xmlns:SOAP="urn:schemas-xmlsoap-org:soap.v1"> <SOAP:Header></SOAP:Header> <SOAP:Body> <m:GetSalesTaxResponse xmlns:m="urn:myserver/soap:TaxCalc"> <SalesTax>4</SalesTax> </m:GetSalesTaxResponse> </SOAP:Body> </SOAP:Envelope> We can build up this document, either by string-concatenation, or by creating a new instance of a DOM, and appending the appropriate nodes. Back on the client, the response is received, and can be decoded by extracting the appropriate node from the Envelope document: Dim objReturn As New MSXML.DomDocument objReturn.LoadXML strReturn strQuery = _ "SOAP:Envelope/SOAP:Body/m:GetSalesTaxResponse/SalesTax" dblTax = objReturn.SelectSingleNode(strQuery).Text And that's it! A functional, compliant SOAP service in a few easy steps. Of course, the service that we have provided is far from sophisticated, but that is to miss the point. In the not-too-distant future, Visual Studio 7 will completely mask the implementation of SOAP; but I believe that there is value in understanding the way the engine turns beneath the hood. SOAP itself is a very simple protocol; and I hope you leave this article with a better understanding the infrastructure that lies behind SOAP, and the methodology through which SOAP-based component services are going to be provided in the future. Next: VB Client Code >>

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Article Index: 1. An Introduction To XML SOAP Using ASP and VB6 2. Step By Step 3. The Server 4. VB Client Code 5. Conclusion

An Introduction To XML SOAP Using ASP and VB6 - VB Client Code ( Page 4 of 5 ) Here's the entire code for your VB client: Sub Main() Dim objHTTP As New MSXML.XMLHTTPRequest Dim strEnvelope As String Dim strReturn As String Dim objReturn As New MSXML.DOMDocument Dim dblTax As Double Dim strQuery As String 'Create the SOAP Envelope strEnvelope = _ "<soap:envelope xmlns:soap=""urn:schemas-xmlsoap-org:soap.v1"">" & _ "<soap:header></soap:header>" & _ "<soap:body>" & _ "<m:getsalestax xmlns:m=""urn:myserver/soap:TaxCalculator"">" & _ "<salestotal>100</salestotal>" & _ "</m:getsalestax>" & _ "</soap:body>" & _ "</soap:envelope>" 'Set up to post to our local server objHTTP.open "post", "http://localhost/soap.asp", False 'Set a standard SOAP/ XML header for the content-type objHTTP.setRequestHeader "Content-Type", "text/xml"

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'Set a header for the method to be called objHTTP.setRequestHeader "SOAPMethodName", _ "urn:myserver/soap:TaxCalculator#GetSalesTax" 'Make the SOAP call objHTTP.send strEnvelope 'Get the return envelope strReturn = objHTTP.responseText 'Load the return envelope into a DOM objReturn.loadXML strReturn 'Query the return envelope strQuery = _ "SOAP:Envelope/SOAP:Body/m:GetSalesTaxResponse/SalesTax" dblTax = objReturn.selectSingleNode(strQuery).Text Debug.Print dblTax End Sub ASP Server Code This code resides in an ASP – Soap.asp, in the root directory of the web server. <% Set objReq = Server.CreateObject("Microsoft.XMLDOM") 'Load the request into XML DOM objReq.Load Request 'Query the DOM for the input parameter strQuery = "SOAP:Envelope/SOAP:Body/m:GetSalesTax/SalesTotal" varSalesTotal = objReq.SelectSingleNode(strQuery).Text 'Calculate the sales tax varSalesTax = varSalesTotal * 0.04 'Prepare the return envelope strTmp = _ "<soap:envelope xmlns:soap=""urn:schemas-xmlsoap-org:soap.v1"">" & _ "<soap:header></soap:header>" & _ "<soap:body>" & _ "<m:getsalestaxresponse xmlns:m=""urn:myserver/soap:TaxCalc"">" & _ "<salestax>" & varSalesTax & "</salestax>" & _ "</m:getsalestaxresponse>" & _ "</soap:body>" & _ "</soap:envelope>" 'Write the return envelope Response.Write strTmp %>

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Article Index: 1. An Introduction To XML SOAP Using ASP and VB6 2. Step By Step 3. The Server 4. VB Client Code 5. Conclusion

An Introduction To XML SOAP Using ASP and VB6 - Conclusion ( Page 5 of 5 ) In this article we've seen how to build a complete SOAP request/response system from scratch using ASP and Visual Basic 6. Even if you aren’t working with ASP and VB6, you can still quite easily adopt the principles in this article to suite your favourite scripting language such as PHP, Perl or any of the .NET languages.

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