C拷貝檔案 - Object Storage Service

本文介紹如何將源Bucket中的檔案（Object）複製到同一地區下相同或不同目標Bucket中。

注意事項

本文以華東1（杭州）外網Endpoint為例。如果您希望通過與OSS同地區的其他阿里雲產品訪問OSS，請使用內網Endpoint。關於OSS支援的Region與Endpoint的對應關係，請參見OSS地區和訪問網域名稱。
本文以OSS網域名稱建立OSSClient為例。如果您希望通過自訂網域名、STS等方式建立OSSClient，請參見初始化。
針對不同檔案大小，需選擇CopyObject或者UploadPartCopy進行拷貝檔案。關於拷貝時的檔案大小限制說明，請參見CopyObject。

通過CopyObject拷貝檔案

說明

拷貝檔案時，您必須擁有源檔案的讀許可權及目標Bucket的讀寫權限。
不支援跨地區拷貝。例如不能將華東1（杭州）地區儲存空間中的檔案拷貝到華北1（青島）地區。

以下代碼用於通過CopyObject拷貝檔案：

#include "oss_api.h"
#include "aos_http_io.h"
/* yourEndpoint填寫Bucket所在地區對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
const char *endpoint = "yourEndpoint";
/* 填寫源Bucket名稱。*/
const char *source_bucket_name = "yourSourceBucketName";
/* 填寫源Object的完整路徑。Object完整路徑中不能包含Bucket名稱。*/
const char *source_object_name = "yourSourceObjectName";
/* 填寫與源Bucket處於同一地區的目標Bucket名稱。*/
const char *dest_bucket_name = "yourDestBucketName";
/* 填寫目標Object的完整路徑。Object完整路徑中不能包含Bucket名稱。*/
const char *dest_object_name = "yourDestObjectName";
/* yourRegion填寫Bucket所在地區對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
const char *region = "yourRegion";
void init_options(oss_request_options_t *options)
{
    options->config = oss_config_create(options->pool);
    /* 用char*類型的字串初始化aos_string_t類型。*/
    aos_str_set(&options->config->endpoint, endpoint);
    /* 從環境變數中擷取訪問憑證。運行本程式碼範例之前，請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    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"));
    //需要額外配置以下兩個參數
    aos_str_set(&options->config->region, region);
    options->config->signature_version = 4;
    /* 是否使用了CNAME。0表示不使用。*/
    options->config->is_cname = 0;
    /* 用於設定網路相關參數，比如逾時時間等。*/
    options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
    /* 在程式入口調用aos_http_io_initialize方法來初始化網路、記憶體等全域資源。*/
    if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
        exit(1);
    }
    /* 用於記憶體管理的記憶體池（pool），等價於apr_pool_t。其實現代碼在apr庫中。*/
    aos_pool_t *pool;
    /* 重新建立一個記憶體池，第二個參數是NULL，表示沒有繼承其它記憶體池。*/
    aos_pool_create(&pool, NULL);
    /* 建立並初始化options，該參數包括endpoint、access_key_id、acces_key_secret、is_cname、curl等全域配置資訊。*/
    oss_request_options_t *oss_client_options;
    /* 在記憶體池中分配記憶體給options。*/
    oss_client_options = oss_request_options_create(pool);
    /* 初始化Client的選項oss_client_options。*/
    init_options(oss_client_options);
    /* 初始化參數。*/
    aos_string_t source_bucket;
    aos_string_t source_object;
    aos_string_t dest_bucket;
    aos_string_t dest_object;
    aos_table_t *headers = NULL;
    aos_table_t *resp_headers = NULL; 
    aos_status_t *resp_status = NULL; 
    aos_str_set(&source_bucket, source_bucket_name);
    aos_str_set(&source_object, source_object_name);
    aos_str_set(&dest_bucket, dest_bucket_name);
    aos_str_set(&dest_object, dest_object_name);
    headers = aos_table_make(pool, 0);
    /* 拷貝檔案。*/
    resp_status = oss_copy_object(oss_client_options, &source_bucket, &source_object, &dest_bucket, &dest_object, headers, &resp_headers);
    if (aos_status_is_ok(resp_status)) {
        printf("copy object succeeded\n");
    } else {
        printf("copy object failed\n");
    }
    /* 釋放記憶體池，相當於釋放了請求過程中各資源分派的記憶體。*/
    aos_pool_destroy(pool);
    /* 釋放之前分配的全域資源。*/
    aos_http_io_deinitialize();
    return 0;
}

通過UploadPartCopy拷貝檔案

以下代碼用於通過UploadPartCopy分區拷貝檔案：

#include "oss_api.h"
#include "aos_http_io.h"
#include <sys/stat.h>
/* yourEndpoint填寫Bucket所在地區對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
const char *endpoint = "yourEndpoint";
/* 填寫源Bucket名稱。*/
const char *source_bucket_name = "yourSourceBucketName";
/* 填寫源Object的完整路徑。Object完整路徑中不能包含Bucket名稱。*/
const char *source_object_name = "yourSourceObjectName";
/* 填寫與源Bucket處於同一地區的目標Bucket名稱。*/
const char *dest_bucket_name = "yourDestBucketName";
/* 填寫目標Object的完整路徑。Object完整路徑中不能包含Bucket名稱。*/
const char *dest_object_name = "yourDestObjectName";
/* yourRegion填寫Bucket所在地區對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
const char *region = "yourRegion";
void init_options(oss_request_options_t* options)
 {
     options->config = oss_config_create(options->pool);
     /* 用char*類型的字串初始化aos_string_t類型。*/
     aos_str_set(&options->config->endpoint, endpoint);
     /* 從環境變數中擷取訪問憑證。運行本程式碼範例之前，請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    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"));
    //需要額外配置以下兩個參數
    aos_str_set(&options->config->region, region);
    options->config->signature_version = 4;
     /* 是否使用了CNAME。0表示不使用。*/
     options->config->is_cname = 0;
     /* 用於設定網路相關參數，比如逾時時間等。*/
     options->ctl = aos_http_controller_create(options->pool, 0);
 }
 int main(int argc, char* argv[])
 {
     /* 在程式入口調用aos_http_io_initialize方法來初始化網路、記憶體等全域資源。*/
     if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
         exit(1);
     }
     /* 用於記憶體管理的記憶體池（pool），等價於apr_pool_t。其實現代碼在apr庫中。*/
     aos_pool_t* pool;
     /* 重新建立一個記憶體池，第二個參數是NULL，表示沒有繼承其它記憶體池。*/
     aos_pool_create(&pool, NULL);
     /* 建立並初始化options，該參數包括endpoint、access_key_id、acces_key_secret、is_cname、curl等全域配置資訊。*/
     oss_request_options_t* oss_client_options;
     /* 在記憶體池中分配記憶體給options。*/
     oss_client_options = oss_request_options_create(pool);
     /* 初始化Client的選項oss_client_options。*/
     init_options(oss_client_options);
     /* 初始化參數。*/
     aos_string_t src_bucket;
     aos_string_t src_object;
     aos_string_t dest_bucket;
     aos_string_t dest_object;
     aos_string_t upload_id;
     aos_table_t* headers = NULL;
     aos_table_t* resp_headers = NULL;
     aos_status_t* resp_status = NULL;
     oss_list_upload_part_params_t* list_upload_part_params;
     oss_upload_part_copy_params_t* upload_part_copy_params1;
     oss_upload_part_copy_params_t* upload_part_copy_params2;
     oss_list_part_content_t* part_content;
     aos_list_t complete_part_list;
     oss_complete_part_content_t* complete_content;
     aos_table_t* list_part_resp_headers = NULL;
     aos_table_t* complete_resp_headers = NULL;
     int part1 = 1;
     int part2 = 2;
     int64_t range_start1 = 0;
     int64_t range_end1 = 6000000;//not less than 5MB
     int64_t range_start2 = 6000001;
     int64_t range_end2;
     int max_ret = 1000;
     int64_t content_length = 0;
     /* 擷取源Object的大小。*/
     headers = aos_table_make(pool, 0);
     aos_str_set(&src_bucket, source_bucket_name);
     aos_str_set(&src_object, source_object_name);
     resp_status = oss_head_object(oss_client_options, &src_bucket, &src_object, headers, &resp_headers);
     if (aos_status_is_ok(resp_status)) {
         char *content_length_str = (char*)apr_table_get(resp_headers, OSS_CONTENT_LENGTH);
         if (content_length_str != NULL) {
             content_length = atoll(content_length_str);
         }
         printf("head object succeeded\n");
     }
     else {
         printf("head object failed\n");
     }
     /*  初始化分區。*/
     headers = aos_table_make(pool, 0);
     aos_str_set(&dest_bucket, dest_bucket_name);
     aos_str_set(&dest_object, dest_object_name);
     resp_status = oss_init_multipart_upload(oss_client_options, &dest_bucket, &dest_object, &upload_id, headers, &resp_headers);
     if (aos_status_is_ok(resp_status)) {
         printf("init multipart upload succeeded, upload_id is %s\n", upload_id.data);
     }
     else {
         printf("init multipart upload failed\n");
     }
     /* 拷貝第一個分區資料。*/
     upload_part_copy_params1 = oss_create_upload_part_copy_params(pool);
     aos_str_set(&upload_part_copy_params1->source_bucket, source_bucket_name);
     aos_str_set(&upload_part_copy_params1->source_object, source_object_name);
     aos_str_set(&upload_part_copy_params1->dest_bucket, dest_bucket_name);
     aos_str_set(&upload_part_copy_params1->dest_object, dest_object_name);
     aos_str_set(&upload_part_copy_params1->upload_id, upload_id.data);
     upload_part_copy_params1->part_num = part1;
     upload_part_copy_params1->range_start = range_start1;
     upload_part_copy_params1->range_end = range_end1;
     headers = aos_table_make(pool, 0);
     resp_status = oss_upload_part_copy(oss_client_options, upload_part_copy_params1, headers, &resp_headers);
     if (aos_status_is_ok(resp_status)) {
         printf("upload part 1 copy succeeded\n");
     }
     else {
         printf("upload part 1 copy failed\n");
     }
     /* 拷貝第二個分區資料。*/
     range_end2 = content_length - 1;
     upload_part_copy_params2 = oss_create_upload_part_copy_params(pool);
     aos_str_set(&upload_part_copy_params2->source_bucket, source_bucket_name);
     aos_str_set(&upload_part_copy_params2->source_object, source_object_name);
     aos_str_set(&upload_part_copy_params2->dest_bucket, dest_bucket_name);
     aos_str_set(&upload_part_copy_params2->dest_object, dest_object_name);
     aos_str_set(&upload_part_copy_params2->upload_id, upload_id.data);
     upload_part_copy_params2->part_num = part2;
     upload_part_copy_params2->range_start = range_start2;
     upload_part_copy_params2->range_end = range_end2;
     headers = aos_table_make(pool, 0);
     resp_status = oss_upload_part_copy(oss_client_options, upload_part_copy_params2, headers, &resp_headers);
     if (aos_status_is_ok(resp_status)) {
         printf("upload part 2 copy succeeded\n");
     }
     else {
         printf("upload part 2 copy failed\n");
     }
     /* 列出分區。*/
     headers = aos_table_make(pool, 0);
     list_upload_part_params = oss_create_list_upload_part_params(pool);
     list_upload_part_params->max_ret = max_ret;
     aos_list_init(&complete_part_list);
     resp_status = oss_list_upload_part(oss_client_options, &dest_bucket, &dest_object, &upload_id, list_upload_part_params, &list_part_resp_headers);
     aos_list_for_each_entry(oss_list_part_content_t, part_content, &list_upload_part_params->part_list, node) {
         complete_content = oss_create_complete_part_content(pool);
         aos_str_set(&complete_content->part_number, part_content->part_number.data);
         aos_str_set(&complete_content->etag, part_content->etag.data);
         aos_list_add_tail(&complete_content->node, &complete_part_list);
     }
     /* 完成分區拷貝。*/
     resp_status = oss_complete_multipart_upload(oss_client_options, &dest_bucket, &dest_object, &upload_id, &complete_part_list, headers, &complete_resp_headers);
     if (aos_status_is_ok(resp_status)) {
         printf("complete multipart upload succeeded\n");
     }
     else {
         printf("complete multipart upload failed\n");
     }
     /* 釋放記憶體池，相當於釋放了請求過程中各資源分派的記憶體。*/
     aos_pool_destroy(pool);
     /* 釋放之前分配的全域資源。*/
     aos_http_io_deinitialize();
     return 0;
 }

Object Storage Service：C拷貝檔案

注意事項

通過CopyObject拷貝檔案

通過UploadPartCopy拷貝檔案

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