对象存储 OSS6. 下载指定文件

详细解答可以参考官方帮助文档

您可以参考下面的代码简单地实现下载指定文件：

    aos_pool_t *p;
    oss_request_options_t *options;
    aos_status_t *s;
    aos_table_t *headers;
    aos_table_t *resp_headers;
    char *bucket_name = "<您的bucket名字>";
    char *object_name = "<您的object名字>";
    aos_string_t bucket;
    aos_string_t object;
    aos_list_t buffer;
    aos_buf_t *content;
    char *buf;
    int64_t len = 0;
    int64_t size = 0;
    int64_t pos = 0;
    aos_pool_create(&p, NULL);
    /* 创建并初始化options */
    options = oss_request_options_create(p);
    init_options(options);
    /* 初始化参数 */
    aos_str_set(&object, object_name);
    aos_str_set(&bucket, bucket_name);
    headers = aos_table_make(p, 1);
    /* 下载文件到buffer中 */
    aos_list_init(&buffer);
    s = oss_get_object_to_buffer(options, &bucket, &object, headers, &buffer, &resp_headers);
    /* 判断请求是否成功 */
    if (aos_status_is_ok(s)) {
        printf("get file succeeded\n");
    } else {
        printf("get file failed\n");
    }
    /* 从buffer中将aos_list_t类型的数据转为char*类型的，并计算读到的文件总长度 */
    len = aos_buf_list_len(&buffer);
    buf = aos_pcalloc(p, len + 1);
    buf[len] = '\0';
    aos_list_for_each_entry(content, &buffer, node) {
        size = aos_buf_size(content);
            memcpy(buf + pos, content->pos, size);
            pos += size;
    }
    /* 释放资源 */
    aos_pool_destroy(p);

注：

• 关于下载文件更详细的信息，参见下载文件