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Object Storage Service:Query the tags of an object

Last Updated:Oct 24, 2023

This topic describes how to query the tags of an Object Storage Service (OSS) object.

Usage notes

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

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

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


The following sample code provides an example on how to query the tags of an object:

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

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 */
    std::string Endpoint = "yourEndpoint";
    /* Specify the name of the bucket. Example: examplebucket. */
    std::string BucketName = "examplebucket";
    /* Specify the full path of the object. Do not include the bucket name in the full path of the object. Example: exampledir/exampleobject.txt. */
    std::string ObjectName = "exampledir/exampleobject.txt";

    /* Initialize resources, such as network resources. */

    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::shared_ptr<std::iostream> content = std::make_shared<std::stringstream>();
    *content << "test cpp sdk";
    PutObjectRequest request(BucketName, ObjectName, content);

    /* Upload the object. */
    auto outcome = client.PutObject(request);

    /* Add tags to the object. */
    Tagging tagging;
    tagging.addTag(Tag("key1", "value1"));
    tagging.addTag(Tag("key2", "value2"));
    auto putTaggingOutcome = client.SetObjectTagging(SetObjectTaggingRequest(BucketName, ObjectName, tagging));

    /* Query the tags of the object. */
    auto getTaggingOutcome = client.GetObjectTagging(GetObjectTaggingRequest(BucketName, ObjectName));

    if (!getTaggingOutcome.isSuccess()) {
        /* Handle exceptions. */
        std::cout << "getTaggingOutcome fail" <<
        ",code:" << getTaggingOutcome.error().Code() <<
        ",message:" << getTaggingOutcome.error().Message() <<
        ",requestId:" << getTaggingOutcome.error().RequestId() << std::endl;
        return -1;
    else {
        auto taglist = getTaggingOutcome.result().Tagging();
        for (const auto& tag : taglist.Tags())
          std::cout <<"GetObjectTagging success, Key:" 
          << tag.Key() << "; Value:" << tag.Value() << std::endl;

    /* Release resources, such as network resources. */
    return 0;


  • For the complete sample code that is used to query the tags of an object, visit GitHub.

  • For more information about the API operation that you can call to query the tags of an object, see GetObjectTagging.