(Visual Basic 6.0) Amazon S3 List More than 1000 Objects in Bucket

See more Amazon S3 Examples

S3 limits the size of the "List Objects" response to 1000 objects. To retrieve a listing of all of the objects in a bucket containing more than 1000 objects, we'll need to send several requests using continuation tokens.

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

Dim http As New ChilkatHttp

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

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

' For the example, we'll get a listing containing approx. 25 objects
' using continuation tokens with an artificially low max-keys set to 5.
' (You may omit the max-keys query parameter to get the default 1000 maximum
' number of keys per request.)

Dim sbContinuationToken As New ChilkatStringBuilder
Dim bGetMore As Long
bGetMore = 1
Dim sbUri As New ChilkatStringBuilder
Dim xml As New ChilkatXml
Dim success As Long
Dim itemKey As String
Dim itemSizeDecimalStr As String
Dim lastModTimestamp As String
Dim dt As New CkDateTime

Do While bGetMore = 1

    ' Make sure to set the "list-type" query param equal to "2".
    ' This chooses the GET Bucket (List Objects) Version 2 of the method.

    ' IMPORTANT: You must include the max-keys param to get a response with a continuation token.
    ' S3 limits the number of objects in a single response to 1000. Therefore, your max-keys
    ' can be up to 1000.  If, for example, you have 2000 objects and do not specify
    ' max-keys, then the response will contain 1000 objects with no continuation token. 
    success = sbUri.SetString("chilkat100?list-type=2&max-keys=5")
    If (sbContinuationToken.Length > 0) Then
        success = sbUri.Append("&continuation-token=")
        success = sbUri.Append(sbContinuationToken.GetEncoded("url","utf-8"))
    End If

    Dim strXml As String
    strXml = http.S3_ListBucketObjects(sbUri.GetAsString())
    If (http.LastMethodSuccess <> 1) Then
        Debug.Print http.LastErrorText
        Exit Sub
    End If

    Debug.Print "Response status code = " & http.LastStatus

    success = xml.LoadXml(strXml)
    If (success <> 1) Then
        Debug.Print 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.Print xml.GetXml()
        Debug.Print "Failed."
        Exit Sub
    End If

    ' If this is not the final response, then we'll get an XML response that begins
    ' like this.  (The IsTruncated child will be "true", and the NextContinuationToken
    ' will have a value to be used in the next request.)
    ' 	<?xml version="1.0" encoding="UTF-8" ?>
    ' 	<ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    ' 	    <Name>chilkat100</Name>
    ' 	    <Prefix />
    ' 	    <NextContinuationToken>1Mlcx+W9OKsr8cxp3DP6r71wgsTUMj0vqlntWoaJKNbYdrauLdf40LsUdBeSYGFhzbGIHdcf5DSLcEBWbqG+1fW1UcQkUW1V4qgQONAKOwb8y8vOLJAQ8iQ==</NextContinuationToken>
    ' 	    <KeyCount>5</KeyCount>
    ' 	    <MaxKeys>5</MaxKeys>
    ' 	    <IsTruncated>true</IsTruncated>
    ' 	

    ' Iterate over the bucket items in this chunk get information for each..
    Dim numItems As Long
    numItems = xml.NumChildrenHavingTag("Contents")
    Debug.Print "Number of bucket items = " & numItems

    Dim i As Long
    i = 0
    Do While i < numItems
        xml.I = i

        itemKey = xml.GetChildContent("Contents[i]|Key")
        itemSizeDecimalStr = xml.GetChildContent("Contents[i]|Size")
        lastModTimestamp = xml.GetChildContent("Contents[i]|LastModified")

        success = dt.SetFromRfc822(lastModTimestamp)
        ' Get a local date/time.
        Dim bLocal As Long
        bLocal = 1
        Dim dtObj As DtObj
        Set dtObj = dt.GetDtObj(bLocal)

        Debug.Print i & ": " & itemKey & ", " & itemSizeDecimalStr & ", " & dtObj.Day & "-" & dtObj.Month & "-" & dtObj.Year _
             & ":" & dtObj.Hour & ":" & dtObj.Minute

        i = i + 1
    Loop

    ' Check IsTruncated.
    bGetMore = 0
    If (xml.ChildContentMatches("IsTruncated","true",1) = 1) Then
        success = sbContinuationToken.SetString(xml.GetChildContent("NextContinuationToken"))
        If (sbContinuationToken.Length > 0) Then
            bGetMore = 1
        End If

    End If

Loop

' The output of this example (when tested) was:

' Response status code = 200
' Number of bucket items = 5
' 0: Abc.ics, 1833, 25-5-2011:9:53
' 1: Corpse Bride film poster.jpg, 53481, 6-9-2016:13:32
' 2: chiliPepper.gif, 7718, 12-3-2017:12:18
' 3: chilkatdude.jpg, 35137, 20-5-2011:16:14
' 4: cloud.search/dfe/indexer/pscc/2016/3/28/id,x-2-15-0-25-87-0.json, 1238, 2-4-2016:12:0
' Response status code = 200
' Number of bucket items = 5
' 0: cloud.search/dfe/indexer/pscc/2016/3/28/idx-2-15-0-25-87-0.json, 1238, 2-4-2016:11:33
' 1: dude.gif, 6373, 25-5-2011:17:29
' 2: french.txt, 47, 12-3-2017:12:18
' 3: hamlet.xml, 279658, 2-5-2016:12:21
' 4: hamlet_play.xml, 279658, 20-3-2017:8:22
' Response status code = 200
' Number of bucket items = 5
' 0: images/sea_creatures/starfish123.jpg, 6229, 19-1-2017:10:45
' 1: images/sea_creatures/starfishåäö.jpg, 6229, 19-1-2017:12:7
' 2: new folder/, 0, 26-11-2014:12:36
' 3: new_starfish.jpg, 6229, 20-3-2017:8:22
' 4: pigs.xml, 2804, 20-3-2017:8:22
' Response status code = 200
' Number of bucket items = 5
' 0: somethingBig.zip, 13089458, 26-9-2016:9:29
' 1: starfish.jpg, 6229, 12-3-2017:12:18
' 2: starfish/, 0, 10-11-2014:10:7
' 3: starfish/starfish.jpg, 6229, 10-11-2014:10:8
' 4: starfish/starfish2.jpg, 6229, 19-11-2014:10:36
' Response status code = 200
' Number of bucket items = 5
' 0: starfish/starfish3.jpg, 6229, 24-11-2014:14:33
' 1: starfish2.jpg, 5987, 20-4-2012:12:6
' 2: starfish3.jpg, 5987, 11-4-2012:7:10
' 3: starfishA.jpg, 6229, 10-5-2016:8:44
' 4: starfishCust.jpg, 6229, 12-11-2014:18:25
' Response status code = 200
' Number of bucket items = 1
' 0: xyz.ics, 1833, 25-5-2011:8:52
' 
'