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.

VB.NET

Dim success As Boolean = False

' 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
success = 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")