Object Storage Service:List buckets (C SDK)

Notas

• Neste tópico, usa-se o endpoint público da região China (Hangzhou). Para acessar o OSS a partir de outros serviços do Alibaba Cloud na mesma região, use um endpoint interno. Para saber mais sobre regiões e endpoints do OSS, consulte Regions and endpoints.

• O exemplo a seguir demonstra como criar uma instância de OSSClient com um endpoint do OSS. Para outras configurações, como usar um domínio personalizado ou autenticar com credenciais do Security Token Service (STS), consulte Initialization (C SDK).

• Para listar buckets, você deve ter a permissão oss:ListBuckets. Para mais detalhes, consulte Grant a custom policy.

Código de exemplo

O código a seguir mostra como listar buckets em todas as regiões da sua conta do Alibaba Cloud:

#include "oss_api.h"
#include "aos_http_io.h"
/* Set yourEndpoint to the endpoint of the region where the bucket is located. For example, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com for the China (Hangzhou) region. */
const char *endpoint = "yourEndpoint";
/* Set yourRegion to the region where the bucket is located. For example, set the region to cn-hangzhou for the China (Hangzhou) region. */
const char *region = "yourRegion";
void init_options(oss_request_options_t *options)
{
    options->config = oss_config_create(options->pool);
    /* Initialize the aos_string_t type with a char* string. */
    aos_str_set(&options->config->endpoint, endpoint);
    /* Obtain access credentials from environment variables. Before you run this sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are set. */
    aos_str_set(&options->config->access_key_id, getenv("OSS_ACCESS_KEY_ID"));
    aos_str_set(&options->config->access_key_secret, getenv("OSS_ACCESS_KEY_SECRET"));
    // Configure the following two parameters.
    aos_str_set(&options->config->region, region);
    options->config->signature_version = 4;
    /* Specify whether to use a CNAME to access OSS. A value of 0 indicates that a CNAME is not used. */
    options->config->is_cname = 0;
    /* Set network parameters, such as the timeout period. */
    options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
    /* Call the aos_http_io_initialize method at the program entry to initialize global resources such as the network and memory. */
    if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
        exit(1);
    }
    /* The memory pool used for memory management. It is equivalent to apr_pool_t. The implementation code is in the apr library. */
    aos_pool_t *pool;
    /* Create a memory pool. The second parameter is NULL, which indicates that the new memory pool does not inherit from another memory pool. */
    aos_pool_create(&pool, NULL);
    /* Create and initialize options. This parameter includes global configuration information such as endpoint, access_key_id, access_key_secret, is_cname, and curl. */
    oss_request_options_t *oss_client_options;
    /* Allocate memory to options in the memory pool. */
    oss_client_options = oss_request_options_create(pool);
    /* Initialize the client options oss_client_options. */
    init_options(oss_client_options);
    /* Initialize parameters. */
    aos_table_t *resp_headers = NULL; 
    aos_status_t *resp_status = NULL; 
    oss_list_buckets_params_t *params = NULL;
    oss_list_bucket_content_t *content = NULL;
    int size = 0;
    params = oss_create_list_buckets_params(pool);
    /* List buckets. */
    resp_status = oss_list_bucket(oss_client_options, params, &resp_headers);
    if (aos_status_is_ok(resp_status)) {
        printf("list buckets succeeded\n");
    } else {
        printf("list buckets failed\n");
    }
    /* Print the buckets. */
    aos_list_for_each_entry(oss_list_bucket_content_t, content, &params->bucket_list, node) {
        printf("BucketName: %s\n", content->name.data);
        ++size;
    }
    /* Release the memory pool. This releases the memory allocated to resources during the request. */
    aos_pool_destroy(pool);
    /* Release the previously allocated global resources. */
    aos_http_io_deinitialize();
    return 0;
}

Referências

Para mais informações sobre a operação de API para listar buckets, consulte ListBuckets (GetService).