(C# UWP/WinRT) 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 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.

Chilkat.Http http = new Chilkat.Http();

// 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.)

Chilkat.StringBuilder sbContinuationToken = new Chilkat.StringBuilder();
bool bGetMore = true;
Chilkat.StringBuilder sbUri = new Chilkat.StringBuilder();
Chilkat.Xml xml = new Chilkat.Xml();
bool success;
string itemKey;
int itemSize;
string lastModTimestamp;
Chilkat.CkDateTime dt = new Chilkat.CkDateTime();

while (bGetMore == 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.
    sbUri.SetString("chilkat100?list-type=2&max-keys=5");
    if (sbContinuationToken.Length > 0) {
        sbUri.Append("&continuation-token=");
        sbUri.Append(sbContinuationToken.GetEncoded("url","utf-8"));
    }

    string strXml = await http.S3_ListBucketObjectsAsync(sbUri.GetAsString());
    if (http.LastMethodSuccess != true) {
        Debug.WriteLine(http.LastErrorText);
        return;
    }

    Debug.WriteLine("Response status code = " + Convert.ToString(http.LastStatus));

    success = xml.LoadXml(strXml);
    if (success != true) {
        Debug.WriteLine(xml.LastErrorText);
        return;
    }

    // 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) {
        Debug.WriteLine(xml.GetXml());
        Debug.WriteLine("Failed.");
        return;
    }

    // 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..
    int numItems = xml.NumChildrenHavingTag("Contents");
    Debug.WriteLine("Number of bucket items = " + Convert.ToString(numItems));

    int i = 0;
    while (i < numItems) {
        xml.I = i;

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

        dt.SetFromRfc822(lastModTimestamp);
        // Get a local date/time.
        bool bLocal = true;
        Chilkat.DtObj dtObj = dt.GetDtObj(bLocal);

        Debug.WriteLine(Convert.ToString(i) + ": " + itemKey + ", " + Convert.ToString(itemSize) + ", " + Convert.ToString(dtObj.Day)
             + "-" + Convert.ToString(dtObj.Month) + "-" + Convert.ToString(dtObj.Year) + ":" + Convert.ToString(dtObj.Hour) + ":"
             + Convert.ToString(dtObj.Minute));

        i = i + 1;
    }

    // Check IsTruncated.
    bGetMore = false;
    if (xml.ChildContentMatches("IsTruncated","true",true) == true) {
        sbContinuationToken.SetString(xml.GetChildContent("NextContinuationToken"));
        if (sbContinuationToken.Length > 0) {
            bGetMore = true;
        }

    }

}

// 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
// 
//