Unicode C++
Unicode C++
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.Chilkat Unicode C++ Downloads
#include <CkHttpW.h>
#include <CkStringBuilderW.h>
#include <CkXmlW.h>
#include <CkDateTimeW.h>
#include <CkDtObjW.h>
void ChilkatSample(void)
{
bool success = false;
// This example assumes the Chilkat HTTP API to have been previously unlocked.
// See Global Unlock Sample for sample code.
CkHttpW http;
// Insert your access key here:
http.put_AwsAccessKey(L"AWS_ACCESS_KEY");
// Insert your secret key here:
http.put_AwsSecretKey(L"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.)
CkStringBuilderW sbContinuationToken;
bool bGetMore = true;
CkStringBuilderW sbUri;
CkXmlW xml;
const wchar_t *itemKey = 0;
const wchar_t *itemSizeDecimalStr = 0;
const wchar_t *lastModTimestamp = 0;
CkDateTimeW dt;
CkDtObjW dtObj;
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.
// 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.
sbUri.SetString(L"chilkat100?list-type=2&max-keys=5");
if (sbContinuationToken.get_Length() > 0) {
sbUri.Append(L"&continuation-token=");
sbUri.Append(sbContinuationToken.getEncoded(L"url",L"utf-8"));
}
const wchar_t *strXml = http.s3_ListBucketObjects(sbUri.getAsString());
if (http.get_LastMethodSuccess() == false) {
wprintf(L"%s\n",http.lastErrorText());
return;
}
wprintf(L"Response status code = %d\n",http.get_LastStatus());
success = xml.LoadXml(strXml);
if (success == false) {
wprintf(L"%s\n",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.get_LastStatus() != 200) {
wprintf(L"%s\n",xml.getXml());
wprintf(L"Failed.\n");
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(L"Contents");
wprintf(L"Number of bucket items = %d\n",numItems);
int i = 0;
while (i < numItems) {
xml.put_I(i);
itemKey = xml.getChildContent(L"Contents[i]|Key");
itemSizeDecimalStr = xml.getChildContent(L"Contents[i]|Size");
lastModTimestamp = xml.getChildContent(L"Contents[i]|LastModified");
dt.SetFromRfc822(lastModTimestamp);
// Get a local date/time.
bool bLocal = true;
dt.ToDtObj(bLocal,dtObj);
wprintf(L"%d: %s, %s, %d-%d-%d:%d:%d\n",i,itemKey,itemSizeDecimalStr,dtObj.get_Day(),dtObj.get_Month(),dtObj.get_Year(),dtObj.get_Hour()
,dtObj.get_Minute());
i = i + 1;
}
// Check IsTruncated.
bGetMore = false;
if (xml.ChildContentMatches(L"IsTruncated",L"true",true) == true) {
sbContinuationToken.SetString(xml.getChildContent(L"NextContinuationToken"));
if (sbContinuationToken.get_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
//
//
}