Object Storage Service:Delete objects

Usage notes

• In this topic, the public endpoint of the China (Hangzhou) region is used. If you want to access OSS from other Alibaba Cloud services in the same region as OSS, use an internal endpoint. For more information about OSS regions and endpoints, see Regions and endpoints.

• In this topic, an OSSClient instance is created by using an OSS endpoint. If you want to create an OSSClient by using custom domain names or Security Token Service (STS), see Create an OSSClient instance.

• To delete an object, you must have the oss:DeleteObject permission. For more information, see Attach a custom policy to a RAM user.

Delete a single object

The following sample code provides an example on how to delete an object named exampleobject.txt from a bucket named examplebucket:

#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* Initialize information about the account that is used to access OSS. */
            
    /* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
    std::string Endpoint = "yourEndpoint";
    /* Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. */
    std::string Region = "yourRegion";
    /* Specify the name of the bucket. Example: examplebucket. */
    std::string BucketName = "examplebucket";
    /* Specify the full path of the object. Example: exampleobject.txt. Do not include the bucket name in the full path. */
    /* If you want to delete a directory, set ObjectName to the directory name. If the directory contains objects, delete all objects from the directory before you delete the directory. */
    std::string ObjectName = "exampleobject.txt";

    /* Initialize resources such as network resources. */
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
   
    DeleteObjectRequest request(BucketName, ObjectName);

    /* Delete the object. */
    auto outcome = client.DeleteObject(request);

    if (!outcome.isSuccess()) {
        /* Handle exceptions. */
        std::cout << "DeleteObject fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }

    /* Release resources such as network resources. */
    ShutdownSdk();
    return 0;
}

Delete multiple objects

You can manually delete up to 1,000 objects at a time. You can delete multiple specified objects, objects whose names contain the specified prefix, or a directory and all objects in the directory.

When you delete multiple objects, the result can be returned in one of the following modes:

• verbose: A list of all deleted objects is returned. This is the default return mode.

• quiet: A list of objects that failed to be deleted is returned.

You can also configure lifecycle rules to automatically delete objects. For more information, see Lifecycle rules based on the last modified time.

The following sample code provides an example on how to delete multiple objects with specified names:

#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* Initialize information about the account that is used to access OSS. */
            
    /* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
    std::string Endpoint = "yourEndpoint";
    /* Specify the name of the bucket. Example: examplebucket. */
    std::string BucketName = "examplebucket";

    /* Initialize resources such as network resources. */
    InitializeSdk();

    ClientConfiguration conf;
    /* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);

    DeleteObjectsRequest request(BucketName);
    /* Add the full paths of multiple objects that you want to delete. */
    request.addKey("yourObjectName1");
    request.addKey("yourObjectName2");
  
    /* Delete the objects. */
    auto outcome = client.DeleteObjects(request);

    if (!outcome.isSuccess()) {
        /* Handle exceptions. */
        std::cout << "DeleteObjects fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }

    /* Release resources such as network resources. */
    ShutdownSdk();
    return 0;
}

The following sample code provides an example on how to delete multiple objects with the specified prefix and how to delete the specified directory and all objects in the directory.

#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* Initialize information about the account that is used to access OSS. */
            
    /* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
    std::string Endpoint = "yourEndpoint";
    /* Specify the name of the bucket. Example: examplebucket. */
    std::string BucketName = "examplebucket";
    /* Specify the prefix of the objects that you want to delete. If you want to delete all objects whose names contain the src prefix, set the prefix to src. After you set the prefix to src, all non-directory objects whose names contain the src prefix, the src directory, and all objects in the src directory are deleted.  */
    std::string keyPrefix = "src";
    /* If you want to delete only the src directory and all objects in the directory, set the prefix to src/. */
    /* std::string keyPrefix = "src/"; */

    /* Initialize resources such as network resources. */
    InitializeSdk();

    ClientConfiguration conf;
    /* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);

    std::string nextMarker = "";
    bool isTruncated = false;
    do {
            /* List objects. */
            ListObjectsRequest request(BucketName);           
            request.setPrefix(keyPrefix);
            request.setMarker(nextMarker);
            auto outcome = client.ListObjects(request);

            if (!outcome.isSuccess()) {
                /* Handle exceptions. */
                std::cout << "ListObjects fail" <<
                ",code:" << outcome.error().Code() <<
                ",message:" << outcome.error().Message() <<
                ",requestId:" << outcome.error().RequestId() << std::endl;
                break;
            }
            for (const auto& object : outcome.result().ObjectSummarys()) {
                DeleteObjectRequest request(BucketName, object.Key());
                /* Delete the objects. */
                auto delResult = client.DeleteObject(request);
            }
            nextMarker = outcome.result().NextMarker();
            isTruncated = outcome.result().IsTruncated();
    } while (isTruncated);

    /* Release resources such as network resources. */
    ShutdownSdk();
    return 0;
}

References

• For the complete sample code that is used to delete a single object or multiple objects, visit GitHub.

• For more information about the API operation that you can call to delete a single object, see DeleteObject.

• For more information about the API operation that you can call to delete multiple objects, see DeleteMultipleObjects.