VB.NET

S3 Get Bucket Objects with CommonPrefixes

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Demonstrates how to get a list of bucket objects using the prefix and delimiter query params to get an XML result with CommonPrefixes. 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

' Insert your access key here:
http.AwsAccessKey = "AWS_ACCESS_KEY"

' Insert your secret key here:
http.AwsSecretKey = "AWS_SECRET_KEY"

' In this example, my bucket is "chilkat100".
' It contains a number of folders, one of which is named "images".
' I want to get a list of all sub-folders under the "images" folder
Dim strXml As String = http.S3_ListBucketObjects("chilkat100?prefix=images/&delimiter=/")
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("----")

' Here is the list of sub-folders (i.e. CommonPrefixes)

' <?xml version="1.0" encoding="UTF-8"?>
' <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
'     <Name>chilkat100</Name>
'     <Prefix>images/</Prefix>
'     <Marker/>
'     <MaxKeys>1000</MaxKeys>
'     <Delimiter>/</Delimiter>
'     <IsTruncated>false</IsTruncated>
'     <CommonPrefixes>
'         <Prefix>images/africa/</Prefix>
'     </CommonPrefixes>
'     <CommonPrefixes>
'         <Prefix>images/sea_creatures/</Prefix>
'     </CommonPrefixes>
' </ListBucketResult>

Dim Prefix As String

' The XML can be parsed like this:
Dim i As Integer = 0
Dim count_i As Integer = xml.NumChildrenHavingTag("CommonPrefixes")
While i < count_i
    xml.I = i
    Prefix = xml.GetChildContent("CommonPrefixes[i]|Prefix")
    Debug.WriteLine("Prefix = " & Prefix)
    i = i + 1
End While