In a versioning-enabled bucket, different versions of the objects may have different storage classes. By default, the RestoreObject operation restores the current version of an object. To restore a specific version of the object, specify the version ID.

The following code provides an example on how to restore an object:

#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
    /*Initialize the OSS account information.*/
    std::string AccessKeyId = "yourAccessKeyId";
    std::string AccessKeySecret = "yourAccessKeySecret";
    std::string Endpoint = "yourEndpoint";
    std::string BucketName = "yourBucketName";
    std::string ObjectName = "yourObjectName";

    /*Initialize network resources.*/

    ClientConfiguration conf;
    OssClient client(Endpoint, AccessKeyId, AccessKeySecret, conf);

    /*Restore an object with the Archive storage class.*/
    RestoreObjectRequest request(BucketName, ObjectName);
    auto outcome = client.RestoreObject(request);

    /*View the version ID of the object to restore.*/
    if (outcome.isSuccess()) {
        std::cout << "versionid:" << outcome.result().VersionId() << std::endl;
    else {
        /*Handle exceptions.*/
        std::cout << "RestoreObject fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;

    /*Release network resources.*/
    return 0;

For more information about restoring an object, see RestoreObject.