You must restore an archive object before you read it. Do not call restoreObject for non-archive objects.

The state conversion process of an archive object is as follows:

  • An archive object is in the frozen state.
  • After you submit it for restoration, the server restores the object. The object is in the restoring state.
  • You can read the object after it is restored. The restored state of the object lasts one day by default. You can prolong this period to a maximum of seven days. Once this period expires, the object returns to the frozen state.

Run the following code to restore an object:

#include "oss_api.h"
#include "aos_http_io.h"
const char *endpoint = "<yourEndpoint>";
const char *access_key_id = "<yourAccessKeyId>";
const char *access_key_secret = "<yourAccessKeySecret>";
const char *bucket_name = "<yourBucketName>";
const char *object_name = "<yourObjectName>";
const char *object_content = "More than just cloud.";
void init_options(oss_request_options_t *options)
    options->config = oss_config_create(options->pool);
    /* Use a char* string to initialize aos_string_t. */
    aos_str_set(&options->config->endpoint, endpoint);
    aos_str_set(&options->config->access_key_id, access_key_id);
    aos_str_set(&options->config->access_key_secret, access_key_secret);
    /* Determine whether the CNAME is used. 0 indicates that the CNAME is not used. */
    options->config->is_cname = 0;
    /* Used to configure network parameters, such as timeout. */
    options->ctl = aos_http_controller_create(options->pool, 0);
int main(int argc, char *argv[])
    /* Call the aos_http_io_initialize method in main() to initialize global resources, such as networks and memories. */
    if (aos_http_io_initialize(NULL, 0) ! = AOSE_OK) {
    /* Memory pool used to manage memories, which is equivalent to apr_pool_t. The implementation code is included in the apr library. */
    aos_pool_t *pool;
    /* Re-create a new memory pool. The second parameter is NULL, indicating that it does not inherit from any other memory pools. */
    aos_pool_create(&pool, NULL);
    /* Create and initialize options. This parameter mainly includes global configuration information, such as endpoint, access_key_id, acces_key_secret, is_cname, and curl. */
    oss_request_options_t *oss_client_options;
    /* Allocate memories in the memory pool to options. */  
    oss_client_options = oss_request_options_create(pool);
    /* Use oss_client_options to initialize client options. */
    /* Initialization parameters. */
    aos_string_t bucket;
    aos_string_t object;
    aos_list_t buffer;
    oss_acl_e oss_acl = OSS_ACL_PRIVATE;
    aos_buf_t *content = NULL;
    aos_table_t *headers = NULL;
    aos_table_t *resp_headers = NULL; 
    aos_status_t *resp_status = NULL; 
    aos_str_set(&bucket, bucket_name);
    aos_str_set(&object, object_name);
    headers = aos_table_make(pool, 0);
    /* Create a bucket of the archive storage class. */
    resp_status = oss_create_bucket_with_storage_class(oss_client_options, &bucket, oss_acl, OSS_STORAGE_CLASS_ARCHIVE, &resp_headers);
    if (aos_status_is_ok(resp_status)) {
        printf("create bucket succeeded\n");
    } else {
        printf("create bucket failed\n");
    content = aos_buf_pack(oss_client_options->pool, object_content, strlen(object_content));
    aos_list_add_tail(&content->node, &buffer);
    /* Upload a file. */
    resp_status = oss_put_object_from_buffer(oss_client_options, &bucket, &object, &buffer, headers, &resp_headers);
    if (aos_status_is_ok(resp_status)) {
        printf("put object from buffer succeeded\n");
    } else {
        printf("put object from buffer failed\n");      
    /* Restore the object. */
    do {
        headers = aos_table_make(pool, 0);
        resp_status = oss_restore_object(oss_client_options, &bucket, &object, headers, &resp_headers);
        printf("restore object resp_status->code: %d \n", resp_status->code);
        if (resp_status->code ! = 409) {
        } else {
            printf("restore object is already in progress, resp_status->code: %d \n", resp_status->code);
    } while (1);
    /* Release the memory pool, that is, memories allocated to resources during the request. */
    /* Release the allocated global resources. */
    return 0;

For more information about the archive storage classes, see Introduction to storage classes. For more information about related status code, see RestoreObject.