(VB.NET UWP/WinRT) OSS List Bucket Objects (Alibaba Cloud)

See more Alibaba Cloud OSS Examples

Demonstrates how to list the objects in a bucket.

The Chilkat S3 functions in the HTTP class are compatible with Alibaba Cloud's OSS service.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

' 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

' Insert your AccessKey ID here:
http.AwsAccessKey = "access-key"

' Insert your AccessKey Secret here:
http.AwsSecretKey = "secret-key"

' To list objects in a bucket located in a different region, use the endpoint for that region, such as "oss-cn-hangzhou.aliyuncs.com 	"
' See Alibaba Object Storage Service Regions and Endpoints
http.AwsEndpoint = "oss-us-east-1.aliyuncs.com"

Dim bucketName As String = "chilkat"

Dim strXml As String = Await http.S3_ListBucketObjectsAsync(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"?>
' <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
'     <Name>chilkat</Name>
'     <Prefix/>
'     <Marker/>
'     <MaxKeys>1000</MaxKeys>
'     <IsTruncated>false</IsTruncated>
'     <Contents>
'         <Key>orchard.json</Key>
'         <LastModified>2021-10-29T16:58:12.000Z</LastModified>
'         <ETag>"303FB46CF341094FEF6274B7789CD6AA"</ETag>
'         <Size>22</Size>
'         <StorageClass>STANDARD</StorageClass>
'         <Owner>
'             <ID>5035535379748121</ID>
'             <DisplayName>5035535379748121</DisplayName>
'         </Owner>
'     </Contents>
'     <Contents>
'         <Key>seahorse.jpg</Key>
'         <LastModified>2021-10-29T16:52:01.000Z</LastModified>
'         <ETag>"A8551F0A5437F43A796FCA7623EE9232"</ETag>
'         <Size>24388</Size>
'         <StorageClass>STANDARD</StorageClass>
'         <Owner>
'             <ID>5035535379748121</ID>
'             <DisplayName>5035535379748121</DisplayName>
'         </Owner>
' 
'     </Contents>
' </ListBucketResult>


Dim Key As String
Dim LastModified As String
Dim ETag As String
Dim Size As Integer
Dim StorageClass As String
Dim ID As String
Dim DisplayName As String

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