Option Explicit Private m_Weather As WeatherClient in .NET framework

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Option Explicit Private m_Weather As WeatherClient
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Private Sub cmdGet_Click() On Error GoTo eh If m_Weather Is Nothing Then CreateProxy End If m_WeatherUseProxy = chkProxyValue
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Dim cw As MSXML2IXMLDOMElement Set cw = m_WeatherGetWeather(txtZipText) DisplayData cw Exit Sub eh: lblInfoCaption = ErrDescription End Sub Private Sub CreateProxy() Set m_Weather = New WeatherClient m_WeatherProxyServer = "localhost" m_WeatherProxyPort = 8080 m_WeatherUseProxy = chkProxyValue m_WeatherLogOn "user01", "password" End Sub
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Private Sub Form_Unload(Cancel As Integer) 'intentionally ignore errors 'this is a one-way method 'and the form is closing On Error Resume Next If Not (m_Weather Is Nothing) Then
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m_WeatherLogOff End If End Sub
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When the user clicks Get Weather, the cmdGet_Click code first checks if the service proxy, stored in m_Weather, has already been created If not, CreateProxy is called CreateProxy instantiates a new WeatherClient object, configures its proxy settings, then calls the LogOn method to obtain a sessionid
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Going back to cmdGet_Click, once the proxy is created, cmdGet_Click calls its GetWeather method passing it the user-entered zip code It then captures the returned XML element and passes it to DisplayData which uses the DOM to extract and display weather information The result is shown in figure 13-8
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Figure 13-8 Running the VB 6 client
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In order to provide some recovery facility, I registered the Weather service with production UDDI registry to enable clients to implement the UDDI invocation pattern (see 11) To register with UDDI, I first saved off the service s WSDL then edited it and removed the implementation part, ie the <service> element I saved the resulting WSDL document at http://wwwlearnxmlwscom/weather/weatherinterfacewsdl I already had a business entity registered with UDDI so all I had to do was register a new tModel and then register the service itself The resulting service key is C6DDD2FB-593B-452A-A225-C6A930EFCDE8 and the binding key (which is what you use for the UDDI invocation model) is 400d2ea3-bc66-485d-9594-b3474d801442
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Implementing the Invocation Pattern I chose to implement the UDDI invocation pattern in a NET client in order to show you two different clients for the Weather service Listing 13-9 shows a partial listing of the client code that retrieves and displays weather information See frmWeathervb for the complete code Listing 13-9 A VB NET client that uses the UDDI invocation pattern to locate the Web service at runtime (VBWSClientCode\13\DotNetClient\frmWeathervb)
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Const BINDING_KEY As String = "eb045631-c5bb-4621-b052-830c13b5d7c8"
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Private _ws As VBWSSERVERWeather Private Sub btnWeather_Click( _ ByVal sender As SystemObject, ByVal e As SystemEventArgs) _ Handles btnWeatherClick Dim cw As CurrentWeather Try cw = GetWeather(txtZipText) Catch ex As Exception If UDDIInvocationPatternIsRecoverable(ex) Then lblStatusText = "Checking UDDI " MeRefresh() If GetCurrentUrl() Then cw = GetWeather(txtZipText) lblStatusText = "" End If Else MessageBoxShow(exMessage) _ws = Nothing End If End Try If Not (cw Is Nothing) Then
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ShowWeatherInfo(cw) End If End Sub Private Function GetWeather(ByVal ZipCode) As VBWSSERVERCurrentWeather If _ws Is Nothing Then CreateProxy() ElseIf chkProxyChecked Then _wsProxy = New SystemNetWebProxy("http://localhost:8080", False) Else _wsProxy = Nothing End If Return _wsGetWeather(ZipCode) End Function
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Private Sub CreateProxy() _ws = New Weather() MeSetProxy() MeDoLogOn() End Sub Private Sub SetProxy() If chkProxyChecked Then _wsProxy = New _ SystemNetWebProxy("http://localhost:8080", False) End If End Sub Private Sub DoLogOn() 'you can change the userid and password here Dim sess As New SessionHeader()
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sessSessionId = _wsLogOn("user01", "password") _wsSessionHeaderValue = sess End Sub Private Function GetCurrentUrl() Try Dim newUrl As String = _ UDDIInvocationPatternGetCurrentUrl(BINDING_KEY) _wsUrl = newUrl Catch ex As Exception MessageBoxShow( _ "There was an error retrieving the current URL from UDDI" + _ " Please try again later " + _ exMessage) Return False End Try MeDoLogOn() Return True End Function
Private Sub frmWeather_Closing(ByVal sender As Object, _ ByVal e As SystemComponentModelCancelEventArgs) _ Handles MyBaseClosing Try If Not (_ws Is Nothing) Then 'call LogOff to end the session _wsLogOff(_wsSessionHeaderValueSessionId) End If Catch ex As Exception