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Set vbws = New SOAPSender 'write the element representing 'the method call vbwsBeginBodyPart "vbws:GetEmpOrders", NS 'write the EmpId parameter vbwsBeginElement "EmpId", "" vbwsAddAttribute "xsi:type", XSI_NS, "xsd:int" 'write the employee id vbwsWriteText CStr(mEmpId) vbwsEndElement vbwsEndBodyPart vbwsServiceUrl = _ "http://localhost/vbwsbook/chapter3/EmployeeOrders/EmpOrdersasp " vbwsSoapAction = """urn:EmployeeOrders""" vbwsSend Set soapMsg = New MSXML2DOMDocument If Not soapMsgloadXML(vbwsGetResponseString) Then MsgBox "Error loading response document " & vbCrLf & _ soapMsgparseErrorreason & vbCrLf & _ "Response document is" & vbCrLf & _ vbwsGetResponseString(), vbCritical Exit Sub Else Call soapMsgsetProperty("SelectionNamespaces", _ "xmlns:vbws='" & NS & "'") Set doc = New MSXML2DOMDocument docloadXML soapMsgselectSingleNode( _ "//vbws:GetEmpOrdersResponse")firstChildText
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Set Data = New ADODBRecordset DataOpen doc Set doc = Nothing End If
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Exit Sub eh: MsgBox "Error sending request" & vbCrLf & ErrDescription End Sub
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Listing 3-10 shows the three lines of code that the client application uses to bind a data grid to the returned Recordset The client (outside of the proxy class shown in listing 3-9) doesn t really know where the Recordset is coming from
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Listing 3-8 Three lines of code is all it takes to invoke the Web service proxy and bind the data grid (VBWSClientCode\chapter3\EmployeeOrdersClient\frmMainfrm)
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Private Sub cmdGetOrders_Click()
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Set empOrdersData = New CEmployeeOrders empOrdersDataEmpId = cboEmpItemData(cboEmpListIndex) Set DataGrid1DataSource = empOrdersData
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End Sub
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As a data source, the proxy class implements GetDataMember which the grid calls to get the ADO Recordset To create and send the request message, I create a SOAPSender object and call its BeginBodyPart method which writes an element as a direct child of <soapenv:Body> As in the example request message in listing 3-8, the body part is called GetEmpOrders and belongs to the operation namespace I then call BeginElement followed by AddAttribute to write <EmpId xsi:type="xsd:int"> with no namespace for the EmpId element itself The call to WriteText writes the employee id, which is a property of the proxy class that must be set by the client application I then set the ServiceUrl and SoapAction properties and call Send to send the request message Next I load the response SOAP message into a DOMDocument called soapMsg and use XPath to get the text of the first child of <GetEmpOrdersResponse> The SOAP RPC rules (SOAP Section 7) specify that the first child of <GetEmpOrdersResponse> must be the method s return value Recall that the returned string is an XML representation of an ADO Recordset so I load it into a DOMDocument called doc I then create a new Recordset and call its Open method passing it this DOMDocument The Recordset handles deserializing itself from XML and the client application can use
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it to bind the data grid Using SOAP RPC, I was able to easily transform this existing application to one that can be easily deployed over an intranet or the Internet even in the presence of firewalls and proxies This is a classic example of using SOAP to facilitate application deployment and smooth operation over existing network infrastructure However, as I explained in 1, you should replace DCOM communication with SOAP only in cases where doing so makes business sense and adds value by enabling application deployment or usage patterns not possible or practical with DCOM
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Section 5 Encoding The majority of the SOAP specification is in Section 5 which represents about 40% of the specification in terms of number of pages It includes detailed rules on serializing application data including arrays and objects which are implemented by most SOAP stacks available today Although Section 5 is a major part of the SOAP specification, I won t go into its details because the tools you use, such as the SOAP Toolkit and NET, will support Section 5 encoding for you so that you do not need to learn its details Additionally, document/literal messaging where you define your own messages using XSD schemas is a better long-term strategy because each industry is likely to have a set of standard XSD schemas that define industry- specific messages I will however give you an overview of Section 5 encoding to enable you to read and troubleshoot SOAP requests and responses as you are likely to do I don t expect that you ll need to know more about Section 5 than what I explain in this section Section 5 encoding supports all the XSD built-in types defined in the XML Schema Part 2: Datatypes specification The following examples represent a string, date, and float respectively Note that I ve included the xsi:type attribute on each element to illustrate the element s type, however this is optional and some SOAP implementations, such as the SOAP Toolkit, do not include this attribute on serialized data
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<!-- this is a string --> <empName xsi:type="xsd:string">Eddie Willers</empName> <!-- this is a date --> <bdate xsi:type="xsd:date">1969-01-17</bdate> <!-- this is a float --> <temperature xsi:type="xsd:float">2500938</temperature>
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A class (or a struct) is serialized as an element with a child element for each member of the class (or struct) which SOAP calls accessors Listing 3-11 shows an example VB NET structure and the corresponding Section 5 encoded format
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Listing 3-9 An example VB NET Structure and a Section 5 encoded instance of it The root element, <theOrder>, represents the structure instance while each of the other elements represents a structure member
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