(VB.NET) Backblaze S3 List Bucket Objects

See more Backblaze S3 Examples

Demonstrates how to list the objects in a bucket.

The Chilkat S3 functions in the HTTP class are compatible with the Backblaze service. However, because of some specific issues, Chilkat v9.5.0.89 or later is needed.

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

Dim http As New Chilkat.Http

' keyID = Access Key ID or Access Key
http.AwsAccessKey = "access-key"

' applicationKey = Secret Access Key or Secret Key
http.AwsSecretKey = "secret-key"

' Region is the 2nd part of your S3 Endpoint
http.AwsEndpoint = "s3.us-west-002.backblazeb2.com"

Dim bucketName As String = "chilkat-test"

Dim strXml As String = http.S3_ListBucketObjects(bucketName)
If (http.LastMethodSuccess <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Response status code = " & http.LastStatus)

Dim xml As New Chilkat.Xml
Dim success As Boolean = xml.LoadXml(strXml)
If (success <> True) Then
    Debug.WriteLine(xml.LastErrorText)
    Exit Sub
End If


' If the response status code was not 200, then the XML response is not a 
' listing of objects, but instead contains error information.
If (http.LastStatus <> 200) Then
    Debug.WriteLine(xml.GetXml())
    Debug.WriteLine("Failed.")
    Exit Sub
End If


' A sample response is shown below.
Debug.WriteLine(xml.GetXml())
Debug.WriteLine("----")

' Use this online tool to generate parsing code from sample XML: 
' Generate Parsing Code from XML

' <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
' <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
'     <Contents>
'         <ETag>"303fb46cf341094fef6274b7789cd6aa"</ETag>
'         <Key>orchard.json</Key>
'         <LastModified>2021-10-30T14:45:52.000Z</LastModified>
'         <Owner>
'             <ID>f2ebbc5f792c</ID>
'             <DisplayName/>
'         </Owner>
'         <Size>22</Size>
'         <StorageClass>STANDARD</StorageClass>
'     </Contents>
'     <Contents>
'         <ETag>"a8551f0a5437f43a796fca7623ee9232"</ETag>
'         <Key>seahorse.jpg</Key>
'         <LastModified>2021-10-30T14:38:53.000Z</LastModified>
'         <Owner>
'             <ID>f2ebbc5f792c</ID>
'             <DisplayName/>
'         </Owner>
'         <Size>24388</Size>
'         <StorageClass>STANDARD</StorageClass>
'     </Contents>
'     <IsTruncated>false</IsTruncated>
'     <MaxKeys>1000</MaxKeys>
'     <Name>chilkat-test</Name>
'     <Prefix/>
'     <Marker/>
' </ListBucketResult>


Dim ETag As String
Dim Key As String
Dim LastModified As String
Dim ID As String
Dim SizeDecimalStr As String
Dim StorageClass As String

Dim ListBucketResult_xmlns As String = xml.GetAttrValue("xmlns")
Dim i As Integer = 0
Dim count_i As Integer = xml.NumChildrenHavingTag("Contents")
While i < count_i
    xml.I = i
    ETag = xml.GetChildContent("Contents[i]|ETag")
    Key = xml.GetChildContent("Contents[i]|Key")
    LastModified = xml.GetChildContent("Contents[i]|LastModified")
    ID = xml.GetChildContent("Contents[i]|Owner|ID")
    SizeDecimalStr = xml.GetChildContent("Contents[i]|Size")
    StorageClass = xml.GetChildContent("Contents[i]|StorageClass")
    i = i + 1
End While
Dim IsTruncated As String = xml.GetChildContent("IsTruncated")
Dim MaxKeys As Integer = xml.GetChildIntValue("MaxKeys")
Dim Name As String = xml.GetChildContent("Name")