如何使用给定的开始和结束日期范围使用AWS C ++ SDK列出S3中的文件

Question

我找不到任何方法或示例代码来列出在给定日期范围内创建的S3文件。我尝试了WithIfModifiedSince，SetIfModifiedSince和GetObjectRequest。

#include <aws/core/Aws.h>
#include <aws/s3/S3Client.h>
#include <aws/s3/model/ListObjectsRequest.h>
#include <aws/s3/model/Object.h>

/* list_files_s3_create_withen_given_date_range */

{
    Aws::S3::S3Client s3_client;

    Aws::S3::Model::ListObjectsRequest objects_request;
    objects_request.WithBucket(bucket_name);

    /* This lists all the files in s3 bucket. */
    /* But how to get files within a given date range. */

    //Aws::S3::Model::GetObjectRequest object_request;
    //object_request.SetBucket(bucket_name);
    //object_request.WithIfModifiedSince(DateTime)

    auto list_objects_outcome = s3_client.ListObjects(objects_request);

    if (list_objects_outcome.IsSuccess())
    {
        Aws::Vector<Aws::S3::Model::Object> object_list =
            list_objects_outcome.GetResult().GetContents();

        for (auto const &s3_object : object_list)
        {
            std::cout << "* " << s3_object.GetKey() << std::endl;
        }
    }
}    

// ------------------------------------

Aws::Utils::DateTime startdt = Aws::Utils::DateTime::DateTime("2019-10-23T10:00:00Z", Aws::Utils::DateFormat::ISO_8601); 

Aws::Utils::DateTime enddt = Aws::Utils::DateTime::Now(); Aws::S3::Model::GetObjectRequest object_request; object_request.SetBucket(bucket_name); object_request.WithIfModifiedSince(startdt); 
//object_request.SetIfModifiedSince(startdt); 

auto object_outcome = s3_client.GetObject(objects_request);
if (object_outcome.IsSuccess())
{
   std::cout << object_outcome.GetResultWithOwnership().GetETag() << std::endl;
}


The code is not returning any object(file) from s3 bucket why ?

Answer 1

I Got the solution: 

1. List all the files from the AWS S3 bucket using ListObjectRequest() & ListObjects()
2. iterate through all the files 1 by 1 
    2.1 pass file name as key to getobjectrequest()
    2.2 pass startdate to GetObjectRequest using WithIfModifiedSince()
    2.3 pass enddate to GetObjectRequest using WithIfUnmodifiedSince()
    2.4 call GetObject() 

// this will return you the object from s3 bucket only if its created or modified withen given datetime range

//But its not the most efficient solution, since we are sending separate GetObject () request for each file to aws s3 which is increasing the requests made to s3.

//please let me know if there is a more efficient way to get all files within a given datetime range in a single request.