分段复制

开发过程中，您有任何问题可以在github上提交issue，或者在华为云对象存储服务论坛中发帖求助。

分段复制是分段上传的一种特殊情况，即分段上传任务中的段通过复制OBS指定桶中现有对象（或对象的一部分）来实现。您可以通过copy_part来复制段，参数描述如下表：

示例代码如下：

static void test_copy_part()
{
    obs_status ret_status = OBS_STATUS_BUTT;
    // 创建并初始化option
    obs_options option;
    init_obs_options(&option);
    option.bucket_options.host_name = "<your-endpoint>";
    option.bucket_options.bucket_name = "<Your bucketname>";

    // 认证用的ak和sk硬编码到代码中或者明文存储都有很大的安全风险，建议在配置文件或者环境变量中密文存放，使用时解密，确保安全；本示例以ak和sk保存在环境变量中为例，运行本示例前请先在本地环境中设置环境变量ACCESS_KEY_ID和SECRET_ACCESS_KEY。
    // 您可以登录访问管理控制台获取访问密钥AK/SK，获取方式请参见https://support.huaweicloud.com/usermanual-ca/ca_01_0003.html
    option.bucket_options.access_key = getenv("ACCESS_KEY_ID");
    option.bucket_options.secret_access_key = getenv("SECRET_ACCESS_KEY");

    // SSE-KMS加密
    server_side_encryption_params encryption_params;
    memset(&encryption_params, 0, sizeof(server_side_encryption_params));
    // 复制段后返回的etag值
    char etagreturn[256] ={0};
    
    char *key= "<Source object key>"
    // 定义拷贝段信息
    obs_copy_destination_object_info object_info;
    memset(&object_info, 0, sizeof(obs_copy_destination_object_info));
    object_info.destination_bucket = "<Your destination bucketname>";
    object_info.destination_key = "<Your destination object key>";
    object_info.etag_return = etagreturn;
    object_info.etag_return_size = 256;
    obs_upload_part_info copypart;
    memset(&copypart, 0, sizeof(obs_upload_part_info));
    // 设置响应回调函数
    obs_response_handler responseHandler =
    { 
        &response_properties_callback,
        &response_complete_callback
    };
    // 拷贝第一段
    copypart.part_number = "1";
    copypart.upload_id = "<upload id>";
    copy_part(&option, key, &object_info, &copypart, 
                  &putProperties,&encryption_params,&responseHandler, &ret_status);
    if (OBS_STATUS_OK == ret_status) {
        printf(" copy part 1 successfully. \n");
    }
    else
    {
        printf("copy part 1 failed(%s).\n", obs_get_status_name(ret_status));
    }
    // 拷贝第二段
    copypart.part_number = "2";
    copypart.upload_id = "<upload id>";
    copy_part(&option, key, &object_info, &copypart, 
                  &putProperties,&encryption_params,&responseHandler, &ret_status);
    if (ret_status == OBS_STATUS_OK) {
        printf(" copy part 2 successfully. \n");
    }
    else
    {
        printf("copy part 2 failed(%s).\n", obs_get_status_name(ret_status));
    }
}