B4X

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.

B4X

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 ChilkatHttp
http.Initialize("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
    Log(http.LastErrorText)
    Return
End If


Log("Response status code = " & http.LastStatus)

Dim xml As ChilkatXml
xml.Initialize
success = xml.LoadXml(strXml)
If success <> True Then
    Log(xml.LastErrorText)
    Return
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
    Log(xml.GetXml)
    Log("Failed.")
    Return
End If


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

'  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 Int = 0
Dim count_i As Int = xml.NumChildrenHavingTag("Contents")
Do 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
Loop
Dim IsTruncated As String = xml.GetChildContent("IsTruncated")
Dim MaxKeys As Int = xml.GetChildIntValue("MaxKeys")
Dim Name As String = xml.GetChildContent("Name")