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SerializerSoapNamespace "xsd", XSD_NS 'write group name SerializerStartElement "newsgroup" 'add the xsi:type attribute SerializerSoapAttribute "type", XSI_NS, "xsd:string", "xsi" SerializerWriteString "microsoftpublicwebservices" SerializerEndElement 'write password SerializerStartElement "numitems" 'add the xsi:type attribute SerializerSoapAttribute "type", XSI_NS, "xsd:int", "xsi" SerializerWriteString "10" SerializerEndElement 'end the operation element SerializerEndElement SerializerEndBody SerializerEndEnvelope SerializerFinished 'send the message ConnectorEndMessage
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'get the response Set Rdr = New SoapReader30 RdrLoad ConnectorOutputStream
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MsgBox ErrDescription, vbCritical, "Error calling service" End Sub
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This example calls a news Web service on codecrazecom Specifically, it calls an operation named getheaders which takes in the name of a newsgroup and the maximum number of items to return and returns a list of nntp message headers from that group The problem with this service is that it requires specific namespace prefixes That is, it requires that the SOAP envelope prefix be SOAP-ENV and the operation element s prefix to be m Of course this should not be the case: XML namespace prefixes should not matter as long as the namespace URIs they point to are correct The code in listing 12-13 starts with a few constant declarations for things like the operation name, service URL, and SOAP Action The rest of the code in listing 12-13 uses the now-familiar low level API It first creates an HttpConnector30 object and sets its EndPointURL and SoapAction properties It then connects to the service and creates a new SoapSerializer30 with the connector s input stream After calling StartEnvelope [4] and StartBody, it calls StartElement to write the operation s element Note that in this example, the prefix m is specified as the operation s prefix because the Web service expects this particular prefix Next, two more elements are written to the request message: newsgroup is the newsgroup name and numitems is the maximum number of items to return Finally, the message is sent and the response message is loaded into a SoapReader30 object The returned list of news items is read using the SoapReader30 s RpcResult property which returns an IXMLDOMNode There s really nothing that different about this example compared to other low-level API examples in chapter 5 You just need to understand what the Web service looks for in a request message and use the toolkit s API to form the message and send it
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NET Web services framework creators are also active in the interop community which means it is generally possible to call any Web service from a NET client In fact, this is easy most of the time unless there are problems with the Web service or the Web service s WSDL Bad WSDL, No Problem When interoperating with non NET Web services, it s common to run into Web services that have no WSDL or whose WSDL cannot be read by VS NET or wsdlexe When this happens, you have to write the proxy code yourself As an example of this scenario, we ll call a Web service that returns sunrise/sunset times given longitude/latitude and a date The Web service s WSDL document was originally located at http://wwwarmyaviatorcom/cgi-bin/astroexe/wsdl/IAstro but has since been taken offline There s a copy of this WSDL in this chapter s client code folder in a subfolder named Astro While the service is no longer online, having a copy of this WSDL allows us to learn how to manually create proxies from an invalid WSDL document There are several errors in the service s WSDL which prevent VS NET from generating the proxy class for us Listing 6-18 shows a shortened version of the service s WSDL where I removed the operations we won t call Listing 12-14 A WSDL document for a live Web service This document doesn t use fully qualified names for WSDL elements and cannot be read by VS NET or wsdlexe (VBWSClientCode\12\Astro\Astrowsdl)
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<definitions xmlns="http://schemasxmlsoaporg/wsdl/" xmlns:xs="http://wwww3org/2001/XMLSchema" name="IAstroservice"
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