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(VB.NET UWP/WinRT) Xero Get Attachment (Download a Xero Attachment)

Demonstrates how to get the content of an attachment in Xero.

Note: This example requires Chilkat v9.5.0.64 or greater.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

' Note: Requires Chilkat v9.5.0.64 or greater.

' This requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim rest As New Chilkat.Rest
Dim success As Boolean


' Before sending REST API calls, the REST object needs to be
' initialized for OAuth1.
' See Xero 2-Legged OAuth1 Setup for sample code.

' Assuming the REST object's OAuth1 authenticator is setup, and the initial
' connection was made, we may now send REST HTTP requests..

' --------------------------------------------------------------
' First get a list of attachments for a given document (in this case a Receipt).

Dim endPoint As String = "Receipts"
Dim receiptID As String = "c4f40e59-c390-0001-caff-ce731c707d00"

Dim sbPath As New Chilkat.StringBuilder
sbPath.Append("/api.xro/2.0/{Endpoint}/{Guid}/Attachments/")
Dim numReplaced As Integer = sbPath.Replace("{Endpoint}",endPoint)
numReplaced = sbPath.Replace("{Guid}",receiptID)

Dim responseXml As String = Await rest.FullRequestNoBodyAsync("GET",sbPath.GetAsString())
If (rest.LastMethodSuccess <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' A 200 response is expected for actual success.
If (rest.ResponseStatusCode <> 200) Then
    Debug.WriteLine(responseXml)
    Exit Sub
End If


' Examine the response.
Debug.WriteLine(responseXml)

' A sample response looks like this:

' 	<Response xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
' 	  <Id>b235646f-34ac-4b15-90ce-d63267f7cd33</Id>
' 	  <Status>OK</Status>
' 	  <ProviderName>ChilkatPrivate</ProviderName>
' 	  <DateTimeUTC>2016-11-11T14:32:17.0908971Z</DateTimeUTC>
' 	  <Attachments>
' 	    <Attachment>
' 	      <AttachmentID>0edcddc8-325f-40c7-b950-8c71f14afc7c</AttachmentID>
' 	      <FileName>penguins.jpg</FileName>
' 	      <Url>http://api.xero.com/api.xro/2.0/Receipts/c4f40e59-c390-0001-caff-ce731c707d00/Attachments/penguins.jpg</Url>
' 	      <MimeType>image/jpg</MimeType>
' 	      <ContentLength>777835</ContentLength>
' 	    </Attachment>
' 	    <Attachment>
' 	      <AttachmentID>0adffdc8-325f-65c7-b950-4391f14af908</AttachmentID>
' 	      <FileName>starfish.jpg</FileName>
' 	      <Url>http://api.xero.com/api.xro/2.0/Receipts/c4f40e59-c390-0001-caff-ce731c707d00/Attachments/starfish.jpg</Url>
' 	      <MimeType>image/jpg</MimeType>
' 	      <ContentLength>24537</ContentLength>
' 	    </Attachment>
' 	  </Attachments>
' 	</Response>

Dim xml As New Chilkat.Xml
xml.LoadXml(responseXml)

' Iterate over the attachments and download each.
Dim numRecords As Integer = xml.NumChildrenAt("Attachments")
Debug.WriteLine("Number of Attachments = " & numRecords)

Dim sbSaveFilePath As New Chilkat.StringBuilder
Dim sbAttachmentPath As New Chilkat.StringBuilder
Dim attachmentData As New Chilkat.BinData
Dim i As Integer = 0
While i < numRecords
    xml.I = i
    Dim attachmentID As String = xml.GetChildContent("Attachments|Attachment[i]|AttachmentID")
    Dim filename As String = xml.GetChildContent("Attachments|Attachment[i]|FileName")

    Debug.WriteLine("AttachmentID: " & attachmentID)
    Debug.WriteLine("Filename: " & filename)
    Debug.WriteLine("----")

    ' Download this attachment.
    ' First build the path for this particular attachment by appending the FileName to the path used to get the list of attachments.
    sbAttachmentPath.Clear()
    sbAttachmentPath.AppendSb(sbPath)
    sbAttachmentPath.Append(filename)

    ' Send the GET request in one call, and then get the response in the next two.
    success = Await rest.SendReqNoBodyAsync("GET",sbAttachmentPath.GetAsString())
    If (success <> True) Then
        Debug.WriteLine(rest.LastErrorText)
        Exit Sub
    End If


    ' Get the response header.  If it's not a 200 success status code, then the response body does NOT contain
    ' the attachment data.
    Dim statusCode As Integer = Await rest.ReadResponseHeaderAsync()
    If (statusCode = -1) Then
        ' We didn't get any response..
        Debug.WriteLine(rest.LastErrorText)
        Exit Sub
    End If

    If (statusCode <> 200) Then
        Debug.WriteLine("Response Status: " & statusCode)
        Dim responseBody As String = Await rest.ReadRespBodyStringAsync()
        If (rest.LastMethodSuccess <> True) Then
            Debug.WriteLine("Failed to read the response body.")
        Else
            Debug.WriteLine(responseBody)
        End If

        Debug.WriteLine("Failed.")
        Exit Sub
    End If


    ' OK, the response header indicates the attachment content is forthcoming...
    ' There are a few ways to get the response body. If it is a very large attachment, it can be streamed directly
    ' to a file.  We'll assume it's not, so we'll get the response into a BinData object, and then save it to a file.
    attachmentData.Clear()
    success = Await rest.ReadRespBdAsync(attachmentData)
    If (success <> True) Then
        Debug.WriteLine(rest.LastErrorText)
        Exit Sub
    End If


    ' Save the data to the file.
    sbSaveFilePath.SetString("qa_output/")
    sbSaveFilePath.Append(filename)
    success = attachmentData.WriteFile(sbSaveFilePath.GetAsString())
    If (success <> True) Then
        Debug.WriteLine("Failed to save to output file.")
    Else
        Debug.WriteLine("Saved to " & sbSaveFilePath.GetAsString())
    End If


    i = i + 1
End While

 

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