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DataFlex Examples

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(DataFlex) Amazon S3 List More than 1000 Objects in Bucket

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.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoHttp
    Handle hoSbContinuationToken
    Boolean iBGetMore
    Handle hoSbUri
    Handle hoXml
    Boolean iSuccess
    String sItemKey
    Integer iItemSize
    String sLastModTimestamp
    Handle hoDt
    String sStrXml
    Integer iNumItems
    Integer i
    Boolean iBLocal
    Variant vDtObj
    Handle hoDtObj
    String sTemp1
    Integer iTemp1
    Integer iTemp2
    Integer iTemp3
    Integer iTemp4
    Integer iTemp5
    Boolean bTemp1

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

    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End

    // Insert your access key here:
    Set ComAwsAccessKey Of hoHttp To "AWS_ACCESS_KEY"

    // Insert your secret key here:
    Set ComAwsSecretKey Of hoHttp To "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.)

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbContinuationToken
    If (Not(IsComObjectCreated(hoSbContinuationToken))) Begin
        Send CreateComObject of hoSbContinuationToken
    End
    Move True To iBGetMore
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbUri
    If (Not(IsComObjectCreated(hoSbUri))) Begin
        Send CreateComObject of hoSbUri
    End
    Get Create (RefClass(cComChilkatXml)) To hoXml
    If (Not(IsComObjectCreated(hoXml))) Begin
        Send CreateComObject of hoXml
    End

    Get Create (RefClass(cComCkDateTime)) To hoDt
    If (Not(IsComObjectCreated(hoDt))) Begin
        Send CreateComObject of hoDt
    End

    While (iBGetMore = True)

        // Make sure to set the "list-type" query param equal to "2".
        // This chooses the GET Bucket (List Objects) Version 2 of the method.
        Get ComSetString Of hoSbUri "chilkat100?list-type=2&max-keys=5" To iSuccess
        Get ComLength Of hoSbContinuationToken To iTemp1
        If (iTemp1 > 0) Begin
            Get ComAppend Of hoSbUri "&continuation-token=" To iSuccess
            Get ComGetEncoded Of hoSbContinuationToken "url" "utf-8" To sTemp1
            Get ComAppend Of hoSbUri sTemp1 To iSuccess
        End

        Get ComGetAsString Of hoSbUri To sTemp1
        Get ComS3_ListBucketObjects Of hoHttp sTemp1 To sStrXml
        Get ComLastMethodSuccess Of hoHttp To bTemp1
        If (bTemp1 <> True) Begin
            Get ComLastErrorText Of hoHttp To sTemp1
            Showln sTemp1
            Procedure_Return
        End

        Get ComLastStatus Of hoHttp To iTemp1
        Showln "Response status code = " iTemp1

        Get ComLoadXml Of hoXml sStrXml To iSuccess
        If (iSuccess <> True) Begin
            Get ComLastErrorText Of hoXml To sTemp1
            Showln sTemp1
            Procedure_Return
        End

        // If the response status code was not 200, then the XML response is not a 
        // listing of objects, but instead contains error information.
        Get ComLastStatus Of hoHttp To iTemp1
        If (iTemp1 <> 200) Begin
            Get ComGetXml Of hoXml To sTemp1
            Showln sTemp1
            Showln "Failed."
            Procedure_Return
        End

        // 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..
        Get ComNumChildrenHavingTag Of hoXml "Contents" To iNumItems
        Showln "Number of bucket items = " iNumItems

        Move 0 To i
        While (i < iNumItems)
            Set ComI Of hoXml To i

            Get ComGetChildContent Of hoXml "Contents[i]|Key" To sItemKey
            Get ComGetChildIntValue Of hoXml "Contents[i]|Size" To iItemSize
            Get ComGetChildContent Of hoXml "Contents[i]|LastModified" To sLastModTimestamp

            Get ComSetFromRfc822 Of hoDt sLastModTimestamp To iSuccess
            // Get a local date/time.
            Move True To iBLocal
            Get ComGetDtObj Of hoDt iBLocal To vDtObj
            If (IsComObject(vDtObj)) Begin
                Get Create (RefClass(cComChilkatDtObj)) To hoDtObj
                Set pvComObject Of hoDtObj To vDtObj
            End

            Get ComDay Of hoDtObj To iTemp1
            Get ComMonth Of hoDtObj To iTemp2
            Get ComYear Of hoDtObj To iTemp3
            Get ComHour Of hoDtObj To iTemp4
            Get ComMinute Of hoDtObj To iTemp5
            Showln i ": " sItemKey ", " iItemSize ", " iTemp1 "-" iTemp2 "-" iTemp3 ":" iTemp4 ":" iTemp5
            Send Destroy of hoDtObj

            Move i + 1 To i
        Loop

        // Check IsTruncated.
        Move False To iBGetMore
        Get ComChildContentMatches Of hoXml "IsTruncated" "true" True To bTemp1
        If (bTemp1 = True) Begin
            Get ComGetChildContent Of hoXml "NextContinuationToken" To sTemp1
            Get ComSetString Of hoSbContinuationToken sTemp1 To iSuccess
            Get ComLength Of hoSbContinuationToken To iTemp1
            If (iTemp1 > 0) Begin
                Move True To iBGetMore
            End

        End

    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
    // 
    // 


End_Procedure

 

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