(VB.NET) Extract PDF from General Ledger Transactions XML

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Demonstrates how to extract the base64 data representing a PDF file from a General Ledger Transactions XML.

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' The General Ledger Transactions XML contains the following:

' <?xml version="1.0" encoding="utf-8" ?>
' <eExact xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="eExact-XML.xsd">
'     <GLTransactions>
'         <GLTransaction entry="100000095">
'             <TransactionType number="20" />
'             <Journal type="20" code="VK">
'                 <Description termid="90003">Verkopen</Description>
'                 <GLAccount type="20" code="400000" />
'                 <Currency code="EUR" />
'             </Journal>
'             <Date>2022-04-05</Date>
'             <Document>
'                 <Subject>100000095</Subject>
'                 <DocumentType number="10" />
'                 <Account code="0001" status="C" />
'                 <Amount>
'                     <Currency code="EUR" />
'                     <Value>1382.91</Value>
'                 </Amount>
'                 <References>
'                     <InvoiceNumber>100000095</InvoiceNumber>
'                 </References>
'                 <Attachments>
'                     <Attachment>
'                         <Name>F_100000095.PDF</Name>
'                         <BinaryData>BASE64_ENCODED_PDF_BYTES_HERE</BinaryData>
'                     </Attachment>
'                 </Attachments>
'             </Document>
'             <GLTransactionLine type="20" status="20" line="0" linetype="0">
'                 <Date>2022-04-05</Date>
'                 <VATType>S</VATType>
'                 <FinYear number="2022" />
'                 <FinPeriod number="4" />
'                 <GLAccount type="20" code="400000" />
'                 <Description>100000095</Description>
'                 <DueDate>2022-05-05</DueDate>
'                 <Account code="0001" status="C">
'                     <Name>90 Degrees &amp; co</Name>
'                 </Account>
'                 <Amount>
'                     <Currency code="EUR" />
'                     <Value>1382.91</Value>
'                 </Amount>
'                 <ForeignAmount>
'                     <Currency code="EUR" />
'                     <Value>1382.91</Value>
'                     <Rate>1</Rate>
'                 </ForeignAmount>
'                 <References>
'                     <InvoiceNumber>100000095</InvoiceNumber>
'                 </References>
'             </GLTransactionLine>
'             <PaymentTerms>
'                 <PaymentTerm entry="100000095" type="20" line="0" paymentMethod="B">
'                     <Description>20</Description>
'                     <GLAccount type="20" code="400000" />
'                     <Amount>
'                         <Currency code="EUR" />
'                         <Debit>1382.91</Debit>
'                         <Credit>0</Credit>
'                     </Amount>
'                     <ForeignAmount>
'                         <Currency code="EUR" />
'                         <Debit>1382.91</Debit>
'                         <Credit>0</Credit>
'                     </ForeignAmount>
'                     <Reference />
'                     <YourRef />
'                     <InvoiceNumber>100000095</InvoiceNumber>
'                     <InvoiceDate>2022-04-05</InvoiceDate>
'                     <DueDate>2022-05-05</DueDate>
'                     <PaymentDate>2022-05-05</PaymentDate>
'                 </PaymentTerm>
'             </PaymentTerms>
'         </GLTransaction>
'     </GLTransactions>
' </eExact>

Dim xml As New Chilkat.Xml

Dim success As Boolean = xml.LoadXmlFile("c:/temp/example.xml")
If (success = False) Then
    Debug.WriteLine(xml.LastErrorText)
    Exit Sub
End If


Dim pdfFilename As String = xml.GetChildContent("GLTransactions|GLTransaction|Document|Attachments|Attachment|Name")
If (xml.LastMethodSuccess = False) Then
    Debug.WriteLine("No XML element at the given path.")
    Exit Sub
End If


Debug.WriteLine("PDF Filename = " & pdfFilename)

Dim binaryDataElem As Chilkat.Xml = xml.GetChildWithTag("GLTransactions|GLTransaction|Document|Attachments|Attachment|BinaryData")
If (xml.LastMethodSuccess = False) Then
    Debug.WriteLine("No XML element at the given path.")
    Exit Sub
End If


' Decode the base64 data and save to a file.
success = binaryDataElem.SaveBinaryContent(pdfFilename,False,False,"")
If (success = False) Then
    Debug.WriteLine(binaryDataElem.LastErrorText)
Else
    Debug.WriteLine("Success.")
End If