VBScript

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. VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

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

set http = CreateObject("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
strXml = http.S3_ListBucketObjects("chilkat100?prefix=images/&delimiter=/")
If (http.LastMethodSuccess <> 1) Then
    outFile.WriteLine(http.LastErrorText)
    WScript.Quit
End If

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

set xml = CreateObject("Chilkat.Xml")
success = xml.LoadXml(strXml)
If (success <> 1) Then
    outFile.WriteLine(xml.LastErrorText)
    WScript.Quit
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
    outFile.WriteLine(xml.GetXml())
    outFile.WriteLine("Failed.")
    WScript.Quit
End If

' A sample response is shown below.
outFile.WriteLine(xml.GetXml())
outFile.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>

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

outFile.Close