Get object tags (C++ SDK) - Object Storage Service - Alibaba Cloud Documentation Center

This topic describes how to retrieve object tags.

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 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.

Example code

The following code shows how to retrieve object tag information:

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


int main(void)
{
    /* Initialize OSS account information. */
            
   /* Set yourEndpoint to the endpoint of the region where the bucket is located. For example, for the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
    std::string Endpoint = "yourEndpoint";
    /* Set yourRegion to the region where the bucket is located. For example, for the China (Hangzhou) region, set the region to cn-hangzhou. */
    std::string Region = "yourRegion";
    /* Specify the bucket name. For example, examplebucket. */
    std::string BucketName = "examplebucket";
    /* Specify the full path of the object. The full path cannot include the bucket name. For example, exampledir/exampleobject.txt. */
    std::string ObjectName = "exampledir/exampleobject.txt";

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

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* Obtain access credentials from environment variables. Before running this sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are set. */
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
    std::shared_ptr<std::iostream> content = std::make_shared<std::stringstream>();
    *content << "test cpp sdk";
    PutObjectRequest request(BucketName, ObjectName, content);

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

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

    /* Get object tags. */
    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 network resources. */
    ShutdownSdk();
    return 0;
}

References

For the complete sample code for retrieving object tags, see GitHub example.
For more information about the API operation for retrieving object tags, see GetObjectTagging.