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Usage accounting can also be implemented by simply applying the usage accounting SOAP extension built in chapter 10 You do this by adding the Accounting attribute to each method for which you want to track usage accounting Assuming you already applied the security extension, you don t need to do anything else to apply usage accounting Listing 13-6 shows the GetTemperature and GetWeather methods with the Accounting attribute added
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Listing 13-6 Applying the security and usage accounting SOAP extensions using attributes (VBWSBook\13\Weatherasmxvb)
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<WebMethod(), _ SoapDocumentMethod( _ Binding:="WeatherInterface", _ Action:="", _ ParameterStyle:=SoapParameterStyleBare), _
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SoapSecurity("Temperature"), _ SoapHeader("sessHdr", _ Required:=True, Direction:=SoapHeaderDirectionIn), _ Accounting (LogResponse:=True)> _ Public Function GetTemperature( _ <XmlElement("TemperatureRequest")> ByVal ZipCode As String) _ As <XmlElement("Temperature")> Single Return WeatherInfoGetTemperatureFromZip(ZipCode) End Function
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<WebMethod(), _ SoapDocumentMethod( _ Binding:="WeatherInterface", _ Action:="", _ ParameterStyle:=SoapParameterStyleBare), _ SoapSecurity("Weather"), _ SoapHeader("sessHdr", _ Required:=True, Direction:=SoapHeaderDirectionIn), _ Accounting(LogResponse:=True)> _ Public Function GetWeather( _ <XmlElement("WeatherRequest")> ByVal ZipCode As String) _ As <XmlElement("CurrentWeather")> CurrentWeather Return WeatherInfoGetWeatherFromZip(ZipCode) End Function
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When a user uses a browser to navigate to the Web service end point (eg weatherasmx) he or she will get a standard help page that lists the Web service s methods This help page is generated by the file DefaultWsdlHelpGeneratoraspx We need to customize this page to inform the user that this service requires registration and give him or her a link to the registration page The name of the default help page is specified in machineconfig in the section called WebServices:
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<wsdlHelpGenerator href="DefaultWsdlHelpGeneratoraspx"/>
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To customize the generated documentation pages, make a copy of this aspx file and do your customization in this copy Then edit the machineconfig file and specify the name of your copy instead of DefaultWsdlHelpGeneratoraspx Alternatively, if you want the custom page to be used for a specific vroot then add the following to the <systemweb> section in the vroot s webconfig file
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<webServices> <wsdlHelpGenerator href="YourCustomPageaspx"/> </webServices>
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The default page contains a large chunk of server-side script that inspects your Web service class to retrieve information such as the list of Web methods and example SOAP request and response for each method After this script comes the HTML used to display this information If you want to customize the page s look, you ll want to customize this HTML For example, I created a page called CustomHelpGeneratoraspx informing users about the registration requirement to use this Web service The custom help page is shown in figure 13-7 Note that the same header is displayed for the method listing page as well as for each method test page
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Figure 13-7 A custom help page notifying users that registration is required Note that the registration link should point to a user registration Web form
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To test the Web service, I decided to build a VB 6 client with the SOAP Toolkit s low level API The project includes a form and a class module that acts as the Web service proxy Listing 13-7 shows the pertinent parts of the class module s code (the entire class is in the file WeatherClientcls)
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Listing 13-7 Implementing a VB 6 client using the SOAP Toolkit (VBWSClientCode\13 \VB6Client\WeatherClientcls)
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Option Explicit Private m_SessionHeader As String Private m_SessionId As String Private Const SERVICE_URL = "http://vbwsserver/vbwsbook/13/Weatherasmx " 'Private Const SERVICE_URL = "http://wwwlearnxmlwscom/weather/Weatherasmx" Private m_Connector As SoapConnector30 Private m_UseProxy As Boolean Public ProxyServer As String Public ProxyPort As Integer Private Function SendMessage(ByVal header As String, _ ByVal body As String, _ Optional ByVal IsOneWay As Boolean = False) _ As MSXML2IXMLDOMElement On Error GoTo eh If m_Connector Is Nothing Then ConnectToService End If m_ConnectorBeginMessage
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Dim Serializer As SoapSerializer30 Set Serializer = New SoapSerializer30 SerializerInit m_ConnectorInputStream 'write the SOAP message SerializerStartEnvelope If Len(header) > 0 Then SerializerStartHeader SerializerWriteXml header SerializerEndHeader End If SerializerStartBody 'write the request document directly SerializerWriteXml body SerializerEndBody SerializerEndEnvelope SerializerFinished 'send the message m_ConnectorEndMessage If Not IsOneWay Then 'get the response Dim Rdr As SoapReader30 Set Rdr = New SoapReader30 RdrLoad m_ConnectorOutputStream If RdrFault Is Nothing Then If RdrBodyEntrieslength > 0 Then Set SendMessage = RdrBodyEntriesItem(0) End If