Torch Object Storage
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Torch Object StorageSDK ReferenceC++Object InterfaceList ObjectsList Multi-Version Objects (C++ SDK)
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List Multi-Version Objects (C++ SDK)
Copy pageDownload PDFList Multi-Version Objects (C++ SDK)
You can use listObjectVersions to list information about multiple object versions within a bucket, with a maximum of 1,000 objects returned per request.
Precautions
- Before listing multi-version objects, you must have the tos:ListBucketVersions permission on the bucket. For detailed instructions, please refer to the IAM Policy Overview.
- Each request returns a subset of multi-version objects from the bucket, with a maximum of 1,000 objects per request. Request parameters can be used as selection criteria to return a specific subset of objects within the bucket.
Parameter Description
Parameters | Description |
Parameters | Description |
prefix | The prefix of the current query results. |
delimiter | Character used to group object names. |
maxKeys | Returns the maximum number of enumerated objects. The default value is 1000. Value range: greater than 0 and less than or equal to 1000. |
encodingType | Encode the returned content and specify the encoding type. Default value: url |
keyMarker | List the starting positions of multi-version objects. Return a list of objects sorted alphabetically, starting after the specified value. This is typically the value of nextMarker returned by the previous request. |
versionIdMarker | Used in conjunction with keyMarker, this sets the starting point after which a lexicographically sorted list of multi-version objects is returned. Obtain nextVersionIdMarker from the results of the previous listing operation. |
Sample Code
Brief Enumeration
The following code is used to list up to 10 versioned objects in the bucket examplebucket.
#include "TosClientV2.h"
using namespace VolcengineTos;
int main(void){
std::string region = "Your Region";
std::string accessKey = std::getenv("TOS_ACCESS_KEY");
std::string secretKey = std::getenv("TOS_SECRET_KEY");
std::string bucketName = "examplebucket";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
ListObjectVersionsV2Input input(bucketName);
input.setMaxKeys(10);
auto output = client.listObjectVersions(input);
if (!output.isSuccess()) {
std::cout << "ListObjectVersions failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
std::cout << "ListObjectVersions success." << std::endl;
for (const auto& versions : output.result().getVersions()) {
std::cout << "versions"<<
",name:" << versions.getKey() <<
",size:" << versions.getSize() <<
",etag:" << versions.getETag() <<
",is latest:" << versions.isLatest() <<
",version id:" << versions.getVersionId() <<
",hashCrc64:" << versions.getHashCrc64Ecma() <<
",lastmodify time:" << versions.getStringFormatLastModified() <<
",storage class:" << versions.getStringFormatStorageClass() << std:: endl;
}
for (const auto& deleteMarker : output.result().getDeleteMarkers()) {
std::cout << "deleteMarkers"<<
",name:" << deleteMarker.getKey() <<
",is latest:" << deleteMarker.isLatest() <<
",version id:" << deleteMarker.getVersionId() <<
",lastmodify time:" << deleteMarker.getStringFormatLastModified() << std:: endl;
}
CloseClient();
return 0;
}
List all objects with the specified prefix
The following code is used to list all versioned objects and delete markers under the bucket examplebucket with the prefix yourkeyPrefix.
#include "TosClientV2.h"
using namespace VolcengineTos;
int main(void){
std::string region = "Your Region";
std::string accessKey = std::getenv("TOS_ACCESS_KEY");
std::string secretKey = std::getenv("TOS_SECRET_KEY");
std::string bucketName = "examplebucket";
std::string prefix = "yourkeyPrefix";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
ListObjectVersionsV2Input input(bucketName);
input.setMaxKeys(1000);
input.setPrefix(prefix);
bool isTruncated = true;
std::string nextKeyMarker = "";
std::string nextVersionIdMarker = "";
while(isTruncated){
input.setKeyMarker(nextKeyMarker);
auto output = client.listObjectVersions(input);
if (!output.isSuccess()) {
std::cout << "ListObjectVersions failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
nextKeyMarker = output.result().getKeyMarker();
isTruncated = output.result().isTruncated();
std::cout << "ListObjectVersions success." << std::endl;
for (const auto& versions : output.result().getVersions()) {
std::cout << "versions"<<
",name:" << versions.getKey() <<
",size:" << versions.getSize() <<
",etag:" << versions.getETag() <<
",is latest:" << versions.isLatest() <<
",version id:" << versions.getVersionId() <<
",hashCrc64:" << versions.getHashCrc64Ecma() <<
",lastmodify time:" << versions.getStringFormatLastModified() <<
",storage class:" << versions.getStringFormatStorageClass() << std:: endl;
}
for (const auto& deleteMarker : output.result().getDeleteMarkers()) {
std::cout << "deleteMarkers"<<
",name:" << deleteMarker.getKey() <<
",is latest:" << deleteMarker.isLatest() <<
",version id:" << deleteMarker.getVersionId() <<
",lastmodify time:" << deleteMarker.getStringFormatLastModified() << std:: endl;
}
}
CloseClient();
return 0;
}
Enumeration means listing all objects.
The following code is used to list all versioned objects and delete markers in the bucket examplebucket.
#include "TosClientV2.h"
using namespace VolcengineTos;
int main(void){
std::string region = "Your Region";
std::string accessKey = std::getenv("TOS_ACCESS_KEY");
std::string secretKey = std::getenv("TOS_SECRET_KEY");
std::string bucketName = "examplebucket";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
ListObjectVersionsV2Input input(bucketName);
input.setMaxKeys(1000);
bool isTruncated = true;
std::string nextKeyMarker = "";
std::string nextVersionIdMarker = "";
while(isTruncated){
input.setKeyMarker(nextKeyMarker);
input.setVersionIdMarker(nextVersionIdMarker);
auto output = client.listObjectVersions(input);
if (!output.isSuccess()) {
std::cout << "ListObjectVersions failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
nextKeyMarker = output.result().getNextKeyMarker();
nextVersionIdMarker = output.result().getNextVersionIdMarker();
isTruncated = output.result().isTruncated();
std::cout << "ListObjectVersions success." << std::endl;
for (const auto& versions : output.result().getVersions()) {
std::cout << "versions"<<
",name:" << versions.getKey() <<
",size:" << versions.getSize() <<
",etag:" << versions.getETag() <<
",is latest:" << versions.isLatest() <<
",version id:" << versions.getVersionId() <<
",hashCrc64:" << versions.getHashCrc64Ecma() <<
",lastmodify time:" << versions.getStringFormatLastModified() <<
",storage class:" << versions.getStringFormatStorageClass() << std:: endl;
}
for (const auto& deleteMarker : output.result().getDeleteMarkers()) {
std::cout << "deleteMarkers"<<
",name:" << deleteMarker.getKey() <<
",is latest:" << deleteMarker.isLatest() <<
",version id:" << deleteMarker.getVersionId() <<
",lastmodify time:" << deleteMarker.getStringFormatLastModified() << std:: endl;
}
}
CloseClient();
return 0;
}
List files and subdirectories in the specified directory
TOS recognizes only the concept of objects; it is possible to create an object with a size of zero whose name contains a slash./The object at the end simulates the functionality of a directory.
The functionality of a directory can be simulated using the delimiter and prefix parameters:
- First, set delimiter to/When prefix is also set to empty, you can return the objects and subdirectory information under the root directory.
- Set the delimiter again to/When the prefix is set to a subdirectory (subfiledir), objects and subdirectories under that subdirectory can be returned.
The following code is used to recursively enumerate objects and subdirectories within a directory. For objects, information for all versions is returned. For directories, only the latest version information is provided.
#include "TosClientV2.h"
using namespace VolcengineTos;
int main(void){
std::string region = "Your Region";
std::string accessKey = std::getenv("TOS_ACCESS_KEY");
std::string secretKey = std::getenv("TOS_SECRET_KEY");
std::string bucketName = "examplebucket";
std::string prefix = "yourkeyPrefix";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
ListObjectVersionsV2Input input(bucketName);
input.setDelimiter("/");
input.setMaxKeys(100);
bool isTruncated = true;
std::string nextKeyMarker = "";
std::string nextVersionIdMarker = "";
while(isTruncated){
input.setKeyMarker(nextKeyMarker);
input.setVersionIdMarker(nextVersionIdMarker);
auto output = client.listObjectVersions(input);
if (!output.isSuccess()) {
std::cout << "ListObjectVersions failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
nextKeyMarker = output.result().getNextKeyMarker();
nextVersionIdMarker = output.result().getNextVersionIdMarker();
isTruncated = output.result().isTruncated();
std::cout << "ListObjectVersions success." << std::endl;
for (const auto& versions : output.result().getVersions()) {
std::cout << "versions"<<
",name:" << versions.getKey() <<
",size:" << versions.getSize() <<
",etag:" << versions.getETag() <<
",is latest:" << versions.isLatest() <<
",version id:" << versions.getVersionId() <<
",hashCrc64:" << versions.getHashCrc64Ecma() <<
",lastmodify time:" << versions.getStringFormatLastModified() <<
",storage class:" << versions.getStringFormatStorageClass() << std::endl;
}
for (const auto& deleteMarker : output.result().getDeleteMarkers()) {
std::cout << "deleteMarkers"<<
",name:" << deleteMarker.getKey() <<
",is latest:" << deleteMarker.isLatest() <<
",version id:" << deleteMarker.getVersionId() <<
",lastmodify time:" << deleteMarker.getStringFormatLastModified() << std::endl;
}
for (const auto& prefix : output.result().getCommonPrefixes()) {
std::cout << "Common Prefixes"<< prefix.getPrefix() << std::endl;
}
}
CloseClient();
return 0;
}
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Last updated: 2025.09.25 14:22:47
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