Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceC++Object InterfaceList ObjectsList Objects V2 (C++ SDK)
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List Objects V2 (C++ SDK)
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This article explains how to use listObjectsType2 to enumerate all objects within a specified bucket, files with a designated prefix, as well as files and subdirectories within a specified directory.
Precautions
- The ListObjects interface has been updated to ListObjectsType2. Developers are strongly encouraged to use ListObjectsType2. To ensure backward compatibility, TOS continues to support the ListObjects interface.
- To use List Objects V2, you must have the tos:ListBucket permission. For detailed instructions, see the IAM Policy Overview.
Parameter Description
The supported parameters for listObjectsType2 are as follows.
Parameters | Description |
Parameters | Description |
prefix | The prefix of the current query results. |
delimiter | The character used to group object names. commonly used/Used as a grouping character. |
startAfter | The starting point for the objects enumerated in this instance. |
continuationToken | The specified enumeration operation must begin from this token. It can be obtained from the nextContinuationToken in the previous listing results. |
maxKeys | The maximum number of objects to be returned. The maximum value is 1,000, meaning that a single request can return up to 1,000 objects. |
encodingType | Specifies the encoding type to be applied to the returned content. The possible values are explained as follows: URL: Perform URL encoding. |
Sample Code
Brief Enumeration
The following code is used to list up to 100 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);
ListObjectsType2Input input(bucketName);
input.setMaxKeys(100);
auto output = client.listObjectsType2(input);
if (!output.isSuccess()) {
std::cout << "ListObjects failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
std::cout << "ListObjects success." << std::endl;
for (const auto& object : output.result().getContents()) {
std::cout << "object"<<
",name:" << object.getKey() <<
",size:" << object.getSize() <<
",lastmodify time:" << object.getStringFormatLastModified() <<
",storage class:" << object.getStringFormatStorageClass() << std:: endl;
}
CloseClient();
return 0;
}
Paginated Listing
The following code is used to list objects in the examplebucket bucket with pagination. By setting maxKeys, you can specify the maximum number of objects returned in a single request. In the sample code, 100 objects are listed from the bucket examplebucket. To continue listing objects, set continuationToken to the nextContinuationToken returned from the initial listing.
#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);
ListObjectsType2Input input(bucketName);
input.setMaxKeys(100);
auto output = client.listObjectsType2(input);
if (!output.isSuccess()) {
std::cout << "ListObjects failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
std::cout << "ListObjects success." << std::endl;
for (const auto& object : output.result().getContents()) {
std::cout << "object"<<
",name:" << object.getKey() <<
",size:" << object.getSize() <<
",lastmodify time:" << object.getStringFormatLastModified() <<
",storage class:" << object.getStringFormatStorageClass() << std::endl;
}
if (output.result().isTruncated()){
input.setContinuationToken(output.result().getNextContinuationToken());
auto output1 = client.listObjectsType2(input);
if (!output1.isSuccess()) {
std::cout << "ListObjects failed." << output1.error().String() << std::endl;
CloseClient();
return -1;
}
std::cout << "ListObjects success." << std::endl;
for (const auto& object : output1.result().getContents()) {
std::cout << "object"<<
",name:" << object.getKey() <<
",size:" << object.getSize() <<
",lastmodify time:" << object.getStringFormatLastModified() <<
",storage class:" << object.getStringFormatStorageClass() << std::endl;
}
}
CloseClient();
return 0;
}
List all objects with the specified prefix
The following code is used to list all objects with the specified prefix 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";
std::string prefix = "yourkeyPrefix";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
ListObjectsType2Input input(bucketName);
input.setPrefix(prefix);
bool isTruncated = true;
std::string nextContinuationToken = "";
while(isTruncated){
input.setContinuationToken(nextContinuationToken);
auto output = client.listObjectsType2(input);
if (!output.isSuccess()) {
std::cout << "ListObjects failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
nextContinuationToken = output.result().getNextContinuationToken();
isTruncated = output.result().isTruncated();
std::cout << "ListObjects success." << std::endl;
for (const auto& object : output.result().getContents()) {
std::cout << "object"<<
",name:" << object.getKey() <<
",size:" << object.getSize() <<
",lastmodify time:" << object.getStringFormatLastModified() <<
",storage class:" << object.getStringFormatStorageClass() << std::endl;
}
}
CloseClient();
return 0;
}
Enumerate all objects
The following code is used to list all 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);
ListObjectsType2Input input(bucketName);
bool isTruncated = true;
std::string nextContinuationToken = "";
while(isTruncated){
input.setContinuationToken(nextContinuationToken);
auto output = client.listObjectsType2(input);
if (!output.isSuccess()) {
std::cout << "ListObjects failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
nextContinuationToken = output.result().getNextContinuationToken();
isTruncated = output.result().isTruncated();
std::cout << "ListObjects success." << std::endl;
for (const auto& object : output.result().getContents()) {
std::cout << "object"<<
",name:" << object.getKey() <<
",size:" << object.getSize() <<
",lastmodify time:" << object.getStringFormatLastModified() <<
",storage class:" << object.getStringFormatStorageClass() << std::endl;
}
}
CloseClient();
return 0;
}
List the files and subdirectories in the specified directory.
TOS supports only the concept of objects and allows the creation of an object with a size of zero and a slash in its name.../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 the delimiter to/When prefix is set to empty, objects and subdirectory information in the root directory can be returned.
- Set the delimiter again to/Simultaneously, when prefix is set to a subdirectory (subfiledir), objects within the subdirectory and its subdirectories can be returned.
The following code is used to enumerate objects and subdirectories in the root directory.
#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);
ListObjectsType2Input input(bucketName);
input.setDelimiter("/");
input.setMaxKeys(1000);
auto output = client.listObjectsType2(input);
if (!output.isSuccess()) {
std::cout << "ListObjects failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
std::cout << "ListObjects success." << std::endl;
for (const auto& object : output.result().getContents()) {
std::cout << "object"<<
",name:" << object.getKey() <<
",size:" << object.getSize() <<
",lastmodify time:" << object.getStringFormatLastModified() <<
",storage class:" << object.getStringFormatStorageClass() << std:: endl;
}
for (const auto& prefix : output.result().getCommonPrefixes()) {
std::cout << "Sub Dir: "<< prefix.getPrefix() << std:: endl;
}
CloseClient();
return 0;
}
Last updated: 2025.09.25 14:22:47
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