对象存储 OSS下载文件到内存

详细解答可以参考官方帮助文档

通过oss_get_object_to_buffer接口，可以实现将文件下载到内存中：

aos_pool_t *p;
oss_request_options_t *options;
aos_status_t *s;
aos_table_t *headers;
aos_table_t *params;
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, 0);
params = aos_table_make(p, 0);
/* 下载文件 */
aos_list_init(&buffer);
s = oss_get_object_to_buffer(options, &bucket, &object, &buffer, headers, params, &resp_headers);
if (aos_status_is_ok(s)) {
    printf("get object succeeded\n");
    /* 将下载内容拷贝到buffer中*/
    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;
    }
} else {
    printf("get object failed\n");
}
aos_pool_destroy(p);

注：

• 2.0.0相对于1.0.0版本，oss_get_object_to_buffer接口增加了params参数，同时headers和params允许为NULL，1.0.0及其之前版本不支持为NULL
• oss_get_object_to_buffer_by_url和oss_get_object_to_file_by_url参数也增加了params参数
• 完整代码参考：GitHub