本文介绍如何将源Bucket中的文件（Object）复制到同一地域下相同或不同目标Bucket中。
注意事项
本文以华东1（杭州）外网Endpoint为例。如果您希望通过与OSS同地域的其他阿里云产品访问OSS，请使用内网Endpoint。关于OSS支持的Region与Endpoint的对应关系，请参见OSS地域和访问域名。
本文以OSS域名新建OSSClient为例。如果您希望通过自定义域名、STS等方式新建OSSClient，请参见初始化。
针对不同文件大小，需选择CopyObject或者UploadPartCopy进行拷贝文件。关于拷贝时的文件大小限制说明，请参见CopyObject。
通过CopyObject拷贝文件
说明
拷贝文件时，您必须拥有源文件的读权限及目标Bucket的读写权限。
不支持跨地域拷贝。例如不能将华东1（杭州）地域存储空间中的文件拷贝到华北1（青岛）地域。
以下代码用于通过CopyObject拷贝文件：
#include "oss_api.h"
#include "aos_http_io.h"
/* yourEndpoint填写Bucket所在地域对应的Endpoint。以华东1（杭州）为例，Endpoint填写为https://oss-cn-hangzhou.aliyuncs.com。*/
const char *endpoint = "yourEndpoint";
/* 填写源Bucket名称。*/
const char *source_bucket_name = "yourSourceBucketName";
/* 填写源Object的完整路径。Object完整路径中不能包含Bucket名称。*/
const char *source_object_name = "yourSourceObjectName";
/* 填写与源Bucket处于同一地域的目标Bucket名称。*/
const char *dest_bucket_name = "yourDestBucketName";
/* 填写目标Object的完整路径。Object完整路径中不能包含Bucket名称。*/
const char *dest_object_name = "yourDestObjectName";
/* yourRegion填写Bucket所在地域对应的Region。以华东1（杭州）为例，Region填写为cn-hangzhou。*/
const char *region = "yourRegion";
void init_options(oss_request_options_t *options)
{
options->config = oss_config_create(options->pool);
/* 用char*类型的字符串初始化aos_string_t类型。*/
aos_str_set(&options->config->endpoint, endpoint);
/* 从环境变量中获取访问凭证。运行本代码示例之前，请确保已设置环境变量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"));
//需要额外配置以下两个参数
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;
/* 用于设置网络相关参数，比如超时时间等。*/
options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
/* 在程序入口调用aos_http_io_initialize方法来初始化网络、内存等全局资源。*/
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
exit(1);
}
/* 用于内存管理的内存池（pool），等价于apr_pool_t。其实现代码在apr库中。*/
aos_pool_t *pool;
/* 重新创建一个内存池，第二个参数是NULL，表示没有继承其它内存池。*/
aos_pool_create(&pool, NULL);
/* 创建并初始化options，该参数包括endpoint、access_key_id、acces_key_secret、is_cname、curl等全局配置信息。*/
oss_request_options_t *oss_client_options;
/* 在内存池中分配内存给options。*/
oss_client_options = oss_request_options_create(pool);
/* 初始化Client的选项oss_client_options。*/
init_options(oss_client_options);
/* 初始化参数。*/
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);
/* 拷贝文件。*/
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");
}
/* 释放内存池，相当于释放了请求过程中各资源分配的内存。*/
aos_pool_destroy(pool);
/* 释放之前分配的全局资源。*/
aos_http_io_deinitialize();
return 0;
}通过UploadPartCopy拷贝文件
以下代码用于通过UploadPartCopy分片拷贝文件：
#include "oss_api.h"
#include "aos_http_io.h"
#include <sys/stat.h>
/* yourEndpoint填写Bucket所在地域对应的Endpoint。以华东1（杭州）为例，Endpoint填写为https://oss-cn-hangzhou.aliyuncs.com。*/
const char *endpoint = "yourEndpoint";
/* 填写源Bucket名称。*/
const char *source_bucket_name = "yourSourceBucketName";
/* 填写源Object的完整路径。Object完整路径中不能包含Bucket名称。*/
const char *source_object_name = "yourSourceObjectName";
/* 填写与源Bucket处于同一地域的目标Bucket名称。*/
const char *dest_bucket_name = "yourDestBucketName";
/* 填写目标Object的完整路径。Object完整路径中不能包含Bucket名称。*/
const char *dest_object_name = "yourDestObjectName";
/* yourRegion填写Bucket所在地域对应的Region。以华东1（杭州）为例，Region填写为cn-hangzhou。*/
const char *region = "yourRegion";
void init_options(oss_request_options_t* options)
{
options->config = oss_config_create(options->pool);
/* 用char*类型的字符串初始化aos_string_t类型。*/
aos_str_set(&options->config->endpoint, endpoint);
/* 从环境变量中获取访问凭证。运行本代码示例之前，请确保已设置环境变量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"));
//需要额外配置以下两个参数
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;
/* 用于设置网络相关参数，比如超时时间等。*/
options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char* argv[])
{
/* 在程序入口调用aos_http_io_initialize方法来初始化网络、内存等全局资源。*/
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
exit(1);
}
/* 用于内存管理的内存池（pool），等价于apr_pool_t。其实现代码在apr库中。*/
aos_pool_t* pool;
/* 重新创建一个内存池，第二个参数是NULL，表示没有继承其它内存池。*/
aos_pool_create(&pool, NULL);
/* 创建并初始化options，该参数包括endpoint、access_key_id、acces_key_secret、is_cname、curl等全局配置信息。*/
oss_request_options_t* oss_client_options;
/* 在内存池中分配内存给options。*/
oss_client_options = oss_request_options_create(pool);
/* 初始化Client的选项oss_client_options。*/
init_options(oss_client_options);
/* 初始化参数。*/
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;
/* 获取源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");
}
/* 初始化分片。*/
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");
}
/* 拷贝第一个分片数据。*/
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");
}
/* 拷贝第二个分片数据。*/
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");
}
/* 列出分片。*/
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);
}
/* 完成分片拷贝。*/
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");
}
/* 释放内存池，相当于释放了请求过程中各资源分配的内存。*/
aos_pool_destroy(pool);
/* 释放之前分配的全局资源。*/
aos_http_io_deinitialize();
return 0;
}相关文档
拷贝小文件
关于拷贝小文件的API接口说明，请参见CopyObject。
拷贝大文件
关于拷贝大文件的API接口说明，请参见UploadPartCopy。