Obtaining a Versioning Object

Updated on 2023-11-09 GMT+08:00

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NOTICE:

If you have any questions during development, post them on the Issues page of GitHub.

You can call get_object to pass the version ID (obs_object_info .version_id) to obtain a versioning object. Sample code is as follows:

static void test_get_object_version()
{
    // Create and initialize the object, and specify the object version through obs_object_info.key.
    obs_object_info object_info;
    memset(&object_info, 0, sizeof(obs_object_info));
    object_info.key =key;
    object_info.version_id = versionid;
    // Create and initialize option.
    obs_options option;
    init_obs_options(&option);
    option.bucket_options.host_name = "<your-endpoint>";
    option.bucket_options.bucket_name = "<Your bucketname>";

    // Hard-coded or plaintext AK/SK are risky. For security purposes, encrypt your AK/SK and store them in the configuration file or environment variables. In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, configure environment variables ACCESS_KEY_ID and SECRET_ACCESS_KEY.
    // Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/eu/usermanual-ca/ca_01_0003.html.
    option.bucket_options.access_key = getenv("ACCESS_KEY_ID");
    option.bucket_options.secret_access_key = getenv("SECRET_ACCESS_KEY");
    // Create and Initialize callback data.
    char *file_name = "./test";
    get_object_callback_data data;
    data.ret_status = OBS_STATUS_BUTT;
    data.outfile = NULL;
    data.outfile = write_to_file(file_name);
    // Set response callback function.
    obs_get_object_handler getobjectHandler =
    { 
        { &response_properties_callback,
          &get_object_complete_callback},
        &get_object_data_callback
    };
    // Obtain a versioning object.
    get_object(&option,&object_info,0,0,&getobjectHandler,&data);
    if (OBS_STATUS_OK == data.ret_status) {
        printf("get object successfully. \n");
    }
    else
    {
        printf("get object faied(%s).\n", obs_get_status_name(data.ret_status));
    }
    fclose(data.outfile);
}