Torch Object Storage
Torch Object Storage
Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceC++Object InterfaceDownload ObjectStandard Download (C++ SDK)
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Standard Download (C++ SDK)
Copy pageDownload PDFStandard Download (C++ SDK)
Standard download refers to downloading a single object via the getObject method. This process supports two modes: downloading the object into memory or saving it to a local file. Additionally, it provides features such as progress bar display, client-side rate limiting, and the ability to override HTTP response headers during object download.
Precautions
- Before downloading an object, you must have the tos:GetObject permission. For specific instructions, please refer to the Permission Configuration Guide.
- To download a specified version of an object from a bucket with versioning enabled, you must have the tos:GetObjectVersion permission. For detailed instructions, please refer to the Permission Configuration Guide.
- If an application downloads the same object in large quantities at the same time, your access speed will be limited by TOS bandwidth and geographic restrictions. It is recommended that you use CDN products to enhance performance while also reducing your costs. For detailed information on accessing TOS via CDN, see Using CDN to Accelerate Access to TOS Resources.
Sample Code
Download object to memory
The following code is used to download the object exampledir/exampleobject.txt from the bucket examplebucket into memory.
#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 objectName = "exampledir/exampleobject.txt";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
GetObjectV2Input input(bucketName, objectName);
auto output = client.getObject(input);
if (!output.isSuccess()) {
std::cout << "GetObject failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
auto stream = output.result().getContent();
std::string ss;
char streamBuffer[256];
memset(streamBuffer, 0, 256);
while (stream->good()) {
stream->read(streamBuffer, 256);
}
std::cout << "GetObject success. the object etag:" << output.result().getETags() << std::endl;
CloseClient();
return 0;
}
Download to local file
The following code is used to download the object exampledir/exampleobject.txt from the bucket examplebucket to a local file.
#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 objectName = "exampledir/exampleobject.txt";
std::string filePath = "/localpath/examplefile.txt";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
GetObjectToFileInput input(bucketName, objectName, filePath);
auto output = client.getObjectToFile(input);
if (!output.isSuccess()) {
std::cout << "GetObjectToFile failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
std::cout << "GetObjectToFile success. the object etag:" << output.result().getETags() << std::endl;
CloseClient();
return 0;
}
Overwriting HTTP Response Headers During Download
The following code is used to download the object exampledir/exampleobject.txt from the bucket examplebucket and to rewrite the HTTP response headers.
#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 objectName = "exampledir/exampleobject.txt";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
GetObjectV2Input input(bucketName, objectName);
input.setResponseCacheControl("no-cache");
input.setResponseContentDisposition("attachment; filename=123.txt");
// input.setResponseContentEncoding("gzip");
// input.setResponseContentLanguage("en-US");
// input.setResponseContentType("text/plain");
// time_t expires = TimeUtils::transGMTFormatStringToTime("Sat, 1 Jan 2022 00:00:00 GMT");
// if (expires == -1){
// std::cout << "Check expires, transfer string type to time_t failed." << std::endl;
// }
// time_t expirationTime = time(nullptr);
// tm* gmtmExpiration = gmtime(&expirationTime);
// gmtmExpiration->tm_min = 0;
// gmtmExpiration->tm_hour = 0;
// gmtmExpiration->tm_sec = 0;
// gmtmExpiration->tm_mday = 1;
// gmtmExpiration->tm_mon = 0;
// gmtmExpiration->tm_wday = 6;
// gmtmExpiration->tm_year = gmtmExpiration->tm_year;
// auto expires = timegm(gmtmExpiration);
//
// input.setResponseExpires(expires);
auto output = client.getObject(input);
if (!output.isSuccess()) {
std::cout << "GetObject failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
std::cout << "GetObject success. the object etag:" << output.result().getETags() << std::endl;
CloseClient();
return 0;
}
Configuring the Progress Bar
The following code is used to configure the download progress bar.
#include "TosClientV2.h"
using namespace VolcengineTos;
static void ProgressCallback(std::shared_ptr<DataTransferStatus> datatransferstatus) {
int64_t consumedBytes = datatransferstatus->consumedBytes_;
int64_t totalBytes = datatransferstatus->totalBytes_;
int64_t rwOnceBytes = datatransferstatus->rwOnceBytes_;
DataTransferType type = datatransferstatus->type_;
int64_t rate = 100 * consumedBytes / totalBytes;
std::cout << "rate:" << rate << ","
<< "ConsumedBytes:" << consumedBytes << ","
<< "totalBytes:" << totalBytes << ","
<< "rwOnceBytes:" << rwOnceBytes << ","
<< "DataTransferType:" << type << std::endl;
}
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 objectName = "exampledir/exampleobject.txt";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
GetObjectV2Input input(bucketName, objectName);
DataTransferListener processHandler = {ProgressCallback, nullptr};
input.setDataTransferListener(processHandler);
auto output = client.getObject(input);
if (!output.isSuccess()) {
std::cout << "GetObject failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
std::cout << "GetObject success. the object etag:" << output.result().getETags() << std::endl;
CloseClient();
return 0;
}
Configure Client Bandwidth Limiting
The following code is used to configure the speed limit for the download client.
#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 objectName = "exampledir/exampleobject.txt";
InitializeClient();
TosClientV2 client(region, accessKey, secretKey);
GetObjectV2Input input(bucketName, objectName);
std::shared_ptr<RateLimiter> RateLimiter(NewRateLimiter(20 * 1024 * 1024, 5 * 1024 * 1024));
input.setRateLimiter(RateLimiter);
auto output = client.getObject(input);
if (!output.isSuccess()) {
std::cout << "GetObject failed." << output.error().String() << std::endl;
CloseClient();
return -1;
}
std::cout << "GetObject success. the object etag:" << output.result().getETags() << std::endl;
CloseClient();
return 0;
}
Relevant Documentation
Last updated: 2025.09.25 14:22:46
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