Truncating an Object

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You can call truncate_object to truncate an object. This API applies only to buckets used as parallel file systems.

static void test_truncate_object()
{
    obs_status ret_status = OBS_STATUS_BUTT;
    // Object name
    char *key = "put_buffer_test";
    // Length of the object to be truncated to
    uint64_t object_length = 10240;
    // 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/intl/en-us/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");
    // Set response callback function.
    obs_response_handler response_handler =
    { 
        &response_properties_callback, &response_complete_callback
    };
    // Truncate an object.
    truncate_object(&option, key, object_length, &response_handler,&ret_status);
    if (OBS_STATUS_OK == ret_status) {
        printf("truncate_object successfully. \n");
    }
    else
    {
        printf("truncate_object failed.\n", obs_get_status_name(ret_status));
    }
}

• truncate_object applies only to buckets used as parallel file systems.
• If the object to be truncated does not exist, an error is reported (HTTP status code 404).