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(Unicode C) Amazon S3 List More than 1000 Objects in BucketSee more Amazon S3 ExamplesS3 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.
#include <C_CkHttpW.h> #include <C_CkStringBuilderW.h> #include <C_CkXmlW.h> #include <C_CkDateTimeW.h> #include <C_CkDtObjW.h> void ChilkatSample(void) { HCkHttpW http; HCkStringBuilderW sbContinuationToken; BOOL bGetMore; HCkStringBuilderW sbUri; HCkXmlW xml; BOOL success; const wchar_t *itemKey; const wchar_t *itemSizeDecimalStr; const wchar_t *lastModTimestamp; HCkDateTimeW dt; const wchar_t *strXml; int numItems; int i; BOOL bLocal; HCkDtObjW dtObj; // This example assumes the Chilkat HTTP API to have been previously unlocked. // See Global Unlock Sample for sample code. http = CkHttpW_Create(); // Insert your access key here: CkHttpW_putAwsAccessKey(http,L"AWS_ACCESS_KEY"); // Insert your secret key here: CkHttpW_putAwsSecretKey(http,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.) sbContinuationToken = CkStringBuilderW_Create(); bGetMore = TRUE; sbUri = CkStringBuilderW_Create(); xml = CkXmlW_Create(); dt = CkDateTimeW_Create(); 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. CkStringBuilderW_SetString(sbUri,L"chilkat100?list-type=2&max-keys=5"); if (CkStringBuilderW_getLength(sbContinuationToken) > 0) { CkStringBuilderW_Append(sbUri,L"&continuation-token="); CkStringBuilderW_Append(sbUri,CkStringBuilderW_getEncoded(sbContinuationToken,L"url",L"utf-8")); } strXml = CkHttpW_s3_ListBucketObjects(http,CkStringBuilderW_getAsString(sbUri)); if (CkHttpW_getLastMethodSuccess(http) != TRUE) { wprintf(L"%s\n",CkHttpW_lastErrorText(http)); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbContinuationToken); CkStringBuilderW_Dispose(sbUri); CkXmlW_Dispose(xml); CkDateTimeW_Dispose(dt); return; } wprintf(L"Response status code = %d\n",CkHttpW_getLastStatus(http)); success = CkXmlW_LoadXml(xml,strXml); if (success != TRUE) { wprintf(L"%s\n",CkXmlW_lastErrorText(xml)); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbContinuationToken); CkStringBuilderW_Dispose(sbUri); CkXmlW_Dispose(xml); CkDateTimeW_Dispose(dt); 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 (CkHttpW_getLastStatus(http) != 200) { wprintf(L"%s\n",CkXmlW_getXml(xml)); wprintf(L"Failed.\n"); CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbContinuationToken); CkStringBuilderW_Dispose(sbUri); CkXmlW_Dispose(xml); CkDateTimeW_Dispose(dt); 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.. numItems = CkXmlW_NumChildrenHavingTag(xml,L"Contents"); wprintf(L"Number of bucket items = %d\n",numItems); i = 0; while (i < numItems) { CkXmlW_putI(xml,i); itemKey = CkXmlW_getChildContent(xml,L"Contents[i]|Key"); itemSizeDecimalStr = CkXmlW_getChildContent(xml,L"Contents[i]|Size"); lastModTimestamp = CkXmlW_getChildContent(xml,L"Contents[i]|LastModified"); CkDateTimeW_SetFromRfc822(dt,lastModTimestamp); // Get a local date/time. bLocal = TRUE; dtObj = CkDateTimeW_GetDtObj(dt,bLocal); wprintf(L"%d: %s, %s, %d-%d-%d:%d:%d\n",i,itemKey,itemSizeDecimalStr,CkDtObjW_getDay(dtObj),CkDtObjW_getMonth(dtObj),CkDtObjW_getYear(dtObj) ,CkDtObjW_getHour(dtObj),CkDtObjW_getMinute(dtObj)); CkDtObjW_Dispose(dtObj); i = i + 1; } // Check IsTruncated. bGetMore = FALSE; if (CkXmlW_ChildContentMatches(xml,L"IsTruncated",L"true",TRUE) == TRUE) { CkStringBuilderW_SetString(sbContinuationToken,CkXmlW_getChildContent(xml,L"NextContinuationToken")); if (CkStringBuilderW_getLength(sbContinuationToken) > 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 // // CkHttpW_Dispose(http); CkStringBuilderW_Dispose(sbContinuationToken); CkStringBuilderW_Dispose(sbUri); CkXmlW_Dispose(xml); CkDateTimeW_Dispose(dt); } |
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