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Figure 5-7 A pseudo sequence diagram showing interaction between an ASP listener, an instance of SoapServer30 and the service s COM component
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You can modify the ASP listener page to suit your needs For example, you can make it send you an email if certain type of error occurs while processing a request If you do modify this page, be careful not to replace it if you re-run the WSDL generator
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Invoking Web Services When you use the high-level API to invoke a Web service, your client application will primarily use a SoapClient30 object shown in figure 5-8 You might also create a class that implements IHeaderHandler to send and/or receive SOAP headers from the Web service
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Figure 5-8 The client-side high-level API
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To invoke a Web service you first instantiate a SoapClient30 object and call its MSSoapinit method passing it the URL to the service s WSDL document as shown in listing 5-1
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Listing 5-5 Using the high level API to invoke a Web service (VBWSClientCode\HLClient\frmClientfrm)
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Private Sub cmdSales_Click() On Error GoTo eh Dim soap As MSSOAPLib30SoapClient30 Set soap = New MSSOAPLib30SoapClient30 'For completeness, we specify the 'service name (HLServer) and 'the port name (StoresSoapPort) 'but they are optional when 'the WSDL doc contains 'one service with one SOAP port soapMSSoapInit WSDL_URL, "HLServer", "StoresSoapPort"
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'the following 3 lines use a proxy 'For example you can use ProxyTrace 'for troubleshooting If chkProxyValue Then soapConnectorProperty("ProxyServer") = "localhost" soapConnectorProperty("ProxyPort") = "8080" soapConnectorProperty("UseProxy") = True End If
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Dim Sales As Double 'this is the Web service call Sales = soapGetStoreSales(UID, PWD, cboStoreIdText) lblSalesCaption = "Sales for this store are: $" & CStr(Sales) Exit Sub eh: Dim msg As String msg = ErrDescription & "Fault Code: " & soapFaultCode msg = msg & vbCrLf & "Fault String: " & soapFaultString msg = msg & vbCrLf & "Fault Detail: " & soapDetail MsgBox msg, vbCritical, "Error calling service"
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End Sub
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After calling MSSoapinit, you then call the Web service operation as if it were a method on SoapClient30 object The example in listing 5-1 calls an operation named GetStoreSales which takes in a user id, a password, and the store id and returns the monthly sales for that store Note that SoapClient30 doesn t actually have a GetStoreSales method, so you will not get this method in intellisense, nor will the compiler catch errors like passing a wrong number of arguments or arguments of the wrong type SoapClient30 exposes a ConnectorProperty that lets you set various HTTP -related properties For example,
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listing 5-5 shows an example of using ConnectorProperty to configure a proxy server The SOAP Toolkit will automatically use the same HTTP proxy settings that you have configured in Internet Explorer s connection settings Therefore, you don t need to explicitly set ProxyServer and ProxyPort unless you don t want to use the same settings as IE, but you do need to set UseProxy to True Error Handling When an error occurs you can use SoapClient30 properties to get information from the SOAP Fault element SoapClient30 exposes Fault information in five properties: FaultActor, FaultCode, FaultCodeNamespace FaultString and Detail Listing 5-5 shows how you can read some of this information in an error handler and present it to the user Troubleshooting with the Trace Utility When things go wrong and you want to troubleshoot your client and/or service, I recommend you start by viewing request/response messages to determine if everything is being sent as you expect it The SOAP Toolkit comes with a handy trace utility that can capture and display HTTP requests as shown in figure 59
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Figure 5-9 Using the trace utility to capture and display SOAP messages
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The trace utility runs on the same machine as the client and listens on the port that you configure, eg port 8080 Instead of sending requests directly to the service, the client sends all requests to the trace utility on the local host Upon receiving a request, the trace utility forwards it to the service which can be on any host (not necessarily the localhost) The service sends back an HTTP response and the trace utility forwards that response back to the client To display captured messages, you can choose a formatted trace which displays nicely formatted XML using Internet Explorer s default stylesheet as in figure 5-10 Or you can choose an unformatted trace which displays message content in hex as shown in figure 5-11
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