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Object Operations

Last updated: 2020-05-13 11:47:39

Overview

This document provides an overview of APIs related to simple object operations, multipart uploads, and other operations as well as their corresponding SDK sample code.

Simple operations

API	Operation Name	Operation Description
GET Bucket (List Object)	Querying an object list	Queries some or all objects in a bucket
PUT Object	Simply uploading an object	Uploads an object to a bucket
HEAD Object	Querying object metadata	Queries the metadata of an object
GET Object	Downloading an object	Downloads an object to the local file system
PUT Object - Copy	Setting object replication	Copies a file to the destination path
DELETE Object	Deleting one object	Deletes a specified object in a bucket
DELETE Multiple Objects	Deleting multiple objects	Deletes multiple objects from a bucket in a single request

Multipart upload operations

API	Operation Name	Operation Description
List Multipart Uploads	Querying multipart uploads	Queries the information of a multipart upload in progress
Initiate Multipart Upload	Initializing a multipart upload	Initializes a multipart upload job
Upload Part	Uploading a part	Uploads a file part
Upload Part - Copy	Copying a part	Copies an object as a part
List Parts	Querying uploaded parts	Queries the uploaded parts of a specified multipart upload operation
Complete Multipart Upload	Completing a multipart upload	Completes the multipart upload of the entire file
Abort Multipart Upload	Aborting a multipart upload	Aborts a multipart upload operation and deletes the uploaded parts

Other operations

API	Operation Name	Operation Description
POST Object restore	Restoring an archived object	Retrieves an archived object for access
PUT Object acl	Setting object ACL	Sets the ACL for a specified object in a bucket
GET Object acl	Querying object ACL	Queries the ACL of an object

Simple Operations

Querying an object list

Feature description

This API is used to query some or all objects in a bucket.

Method prototype

CosResult GetBucket(const GetBucketReq& req, GetBucketResp* resp)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";

// The constructor of GetBucketReq requires bucket_name to be passed in
qcloud_cos::GetBucketReq req(bucket_name);
qcloud_cos::GetBucketResp resp;
qcloud_cos::CosResult result = cos.GetBucket(req, &resp);

// The call is successful. You can call the resp member functions to get the return content
if (result.IsSucc()) {
    std::cout << "Name=" << resp.GetName() << std::endl;
    std::cout << "Prefix=" << resp.GetPrefix() << std::endl;
    std::cout << "Marker=" << resp.GetMarker() << std::endl;
    std::cout << "MaxKeys=" << resp.GetMaxKeys() << std::endl;
} else {
    std::cout << "ErrorInfo=" << result.GetErrorInfo() << std::endl;
    std::cout << "HttpStatus=" << result.GetHttpStatus() << std::endl;
    std::cout << "ErrorCode=" << result.GetErrorCode() << std::endl;
    std::cout << "ErrorMsg=" << result.GetErrorMsg() << std::endl;
    std::cout << "ResourceAddr=" << result.GetResourceAddr() << std::endl;
    std::cout << "XCosRequestId=" << result.GetXCosRequestId() << std::endl;
    std::cout << "XCosTraceId=" << result.GetXCosTraceId() << std::endl;
}

Parameter description

Parameter	Description
req	GetBucketReq, the request for the GetBucket operation
resp	GetBucketResp, the return of the GetBucket operation

GetBucketResp provides the following member functions for getting the specific content (in XML format) returned by Get Bucket.

std::vector<Content> GetContents();
std::string GetName();
std::string GetPrefix();
std::string GetMarker();
uint64_t GetMaxKeys();
bool IsTruncated();
std::vector<std::string> GetCommonPrefixes();

Content is defined as follows:

struct Content {
    std::string m_key; // Object key
    std::string m_last_modified; // Time the object was last modified 
    std::string m_etag; // MD5 checksum of the file
    std::string m_size; // File size in bytes
    std::vector<std::string> m_owner_ids; // Bucket owner information
    std::string m_storage_class; // Storage class of the object. Enumerated values: STANDARD, STANDARD_IA
};

Simply uploading an object

Feature description

This API is used to upload an object to a specified bucket.

Method prototype

/// Upload via a stream
CosResult PutObject(const PutObjectByStreamReq& req, PutObjectByStreamResp* resp)

/// Upload a local file
CosResult PutObject(const PutObjectByFileReq& req, PutObjectByFileResp* resp)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "object_name";

// Simple upload (stream)
{
    std::istringstream iss("put object");
    // The constructor of the request requires istream to be passed in
    qcloud_cos::PutObjectByStreamReq req(bucket_name, object_name, iss);
    // Call the Set method to set metadata, ACL, etc.
    req.SetXCosStorageClass("STANDARD_IA");
    // Disable MD5 check. To enable, use req.TurnOnComputeConentMd5(). This feature is enabled by default
    req.TurnOffComputeConentMd5();
    qcloud_cos::PutObjectByStreamResp resp;
    qcloud_cos::CosResult result = cos.PutObject(req, &resp);

    if (result.IsSucc()) {
        // The call is successful. You can call the resp member functions to get the return content
        do sth
    } else {
        // The call failed. You can call the result member functions to get the error information
        std::cout << "ErrorInfo=" << result.GetErrorInfo() << std::endl;
        std::cout << "HttpStatus=" << result.GetHttpStatus() << std::endl;
        std::cout << "ErrorCode=" << result.GetErrorCode() << std::endl;
        std::cout << "ErrorMsg=" << result.GetErrorMsg() << std::endl;
        std::cout << "ResourceAddr=" << result.GetResourceAddr() << std::endl;
        std::cout << "XCosRequestId=" << result.GetXCosRequestId() << std::endl;
        std::cout << "XCosTraceId=" << result.GetXCosTraceId() << std::endl;
     }
}

// Simple upload (file)
{
    // The constructor of the request requires the local file path to be passed in
    qcloud_cos::PutObjectByFileReq req(bucket_name, object_name, "/path/to/local/file");
    // Call the Set method to set metadata, ACL, etc.
    req.SetXCosStorageClass("STANDARD_IA");
    // Disable MD5 check. To enable, use req.TurnOnComputeConentMd5(). This feature is enabled by default
    req.TurnOffComputeConentMd5();
    qcloud_cos::PutObjectByFileResp resp;
    qcloud_cos::CosResult result = cos.PutObject(req, &resp);
        if (result.IsSucc()) {
        // The call is successful. You can call the resp member functions to get the return content
        do sth
    } else {
        // The call failed. You can call the result member functions to get the error information
        std::cout << "ErrorInfo=" << result.GetErrorInfo() << std::endl;
        std::cout << "HttpStatus=" << result.GetHttpStatus() << std::endl;
        std::cout << "ErrorCode=" << result.GetErrorCode() << std::endl;
        std::cout << "ErrorMsg=" << result.GetErrorMsg() << std::endl;
        std::cout << "ResourceAddr=" << result.GetResourceAddr() << std::endl;
        std::cout << "XCosRequestId=" << result.GetXCosRequestId() << std::endl;
        std::cout << "XCosTraceId=" << result.GetXCosTraceId() << std::endl;
     }
}

Parameter description

Parameter	Description
req	PutObjectByStreamReq/PutObjectByFileReq, the requests for the PutObject operation
resp	PutObjectByStreamResp/PutObjectByFileResp, the returns of the PutObject operation

The Req parameter contains the following member functions:

// Cache-Control: cache policy as defined in RFC 2616, will be stored as object metadata
void SetCacheControl(const std::string& str);

// Content-Disposition: filename as defined in RFC 2616, will be stored as object metadata
void SetContentDisposition(const std::string& str);

// Content-Encoding: encoding format as defined in RFC 2616, will be stored as object metadata
void SetContentEncoding(const std::string& str);

// Content-Type: content type (MIME) as defined in RFC 2616, will be stored as object metadata
void SetContentType(const std::string& str);

// Expect: if `Expect: 100-continue` is used, the request content will be sent only after confirmation from the server is received
void SetExpect(const std::string& str);

// Expires: file expiration time as defined in RFC 2616, will be stored as object metadata
void SetExpires(const std::string& str);

// Headers that allow user-customization, will be returned as object metadata of up to 2 KB
void SetXCosMeta(const std::string& key, const std::string& value);

// x-cos-storage-class: sets the storage class of an object. Enumerated values: STANDARD, STANDARD_IA, ARCHIVE
// Default value: STANDARD
void SetXCosStorageClass(const std::string& storage_class);

// Define the ACL attribute of the object. Valid values: private, public-read
// Default value: private
void SetXcosAcl(const std::string& str);

// Grant read permission in the format: x-cos-grant-read: id=" ",id=" ".
// When you need to authorize a sub-account, id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>"
// When you need to authorize a root account, id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>"
void SetXcosGrantRead(const std::string& str);

// Grant read-write permission in the format: x-cos-grant-full-control: id=" ",id=" ".
// When you need to authorize a sub-account, id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>",
// When you need to authorize a root account, id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>"
void SetXcosGrantFullControl(const std::string& str);

/// Set the algorithm used for server-side encryption. Currently, AES256 is supported
void SetXCosServerSideEncryption(const std::string& str);

The Resp parameter contains the following member functions:

/// Get the object’s version number. If versioning is not enabled for the bucket, an empty string will be returned
std::string GetVersionId();

/// Algorithm used for server-side encryption
std::string GetXCosServerSideEncryption();

Querying object metadata

Feature description

This API is used to query object metadata.

Method prototype

CosResult HeadObject(const HeadObjectReq& req, HeadObjectResp* resp)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "object_name";
qcloud_cos::HeadObjectReq req(bucket_name, object_name);
qcloud_cos::HeadObjectResp resp;
qcloud_cos::CosResult result = cos.HeadObject(req, &resp);
if (result.IsSucc()) {
    // The download is successful. You can call the HeadObjectResp member functions
} else {
    // Failed to download. You can call the CosResult member functions to output the error information, such as requestID
}

Parameter description

Parameter	Description
req	HeadObjectReq, the request for the HeadObject operation
resp	HeadObjectResp, the return of the HeadObject operation

In addition to member functions that read common headers, HeadObjectResp provides the following member functions:

std::string GetXCosObjectType();

std::string GetXCosStorageClass();

// Get custom metadata. The parameter can be the "*" in x-cos-meta-*
std::string GetXCosMeta(const std::string& key);

// Return all custom metadata as a map. The map key does not contain the "x-cos-meta-" prefix
std::map<std::string, std::string> GetXCosMetas();

// Get the algorithm used for server-side encryption
std::string GetXCosServerSideEncryption();

Downloading an object

Feature description

This API (Get Object) is used to download an object to the local file system.

Method prototype

// Download the object to a local file
CosResult GetObject(const GetObjectByFileReq& req, GetObjectByFileResp* resp)

// Download the object to a stream
CosResult GetObject(const GetObjectByStreamReq& req, GetObjectByStreamResp* resp)

// Download the object to a local file (multi-threaded)
CosResult GetObject(const MultiGetObjectReq& req, MultiGetObjectResp* resp)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "object_name";
std::string local_path = "/tmp/object_name";

// Download into a local file
{
    // The request needs to carry the appid, bucketname, object, and local path (including filename)
    qcloud_cos::GetObjectByFileReq req(bucket_name, object_name, local_path);
    qcloud_cos::GetObjectByFileResp resp;
    qcloud_cos::CosResult result = cos.GetObject(req, &resp);
    if (result.IsSucc()) {
        // The download is successful. You can call the GetObjectByFileResp member functions
    } else {
        // You can call the CosResult member functions to output the error information, such as requestID
    }
}

// Download into a stream
{
    // The request needs to carry the appid, bucketname, object, and output stream
    std::ostringstream os;
    qcloud_cos::GetObjectByStreamReq req(bucket_name, object_name, os);
    qcloud_cos::GetObjectByStreamResp resp;
    qcloud_cos::CosResult result = cos.GetObject(req, &resp);
    if (result.IsSucc()) {
        // The download is successful. You can call the GetObjectByStreamResp member functions
    } else {
        // Failed to download. You can call the CosResult member functions to output the error information, such as requestID
    }
}

// Download a file to the local file system (multi-threaded)
{
    // request needs to carry the appid, bucketname, object, and local path (including filename)
    qcloud_cos::MultiGetObjectReq req(bucket_name, object_name, local_path);
    qcloud_cos::MultiGetObjectResp resp;
    qcloud_cos::CosResult result = cos.GetObject(req, &resp);
    if (result.IsSucc()) {
        // The download is successful. You can call the MultiGetObjectResp member functions
    } else {
        // Failed to download. You can call the CosResult member functions to output the error information, such as requestID
    }
}

Parameter description

Parameter	Description
req	GetObjectByFileReq/GetObjectByStreamReq/MultiGetObjectReq, the requests for the GetObject operation
resp	GetObjectByFileResp/GetObjectByStreamResp/MultiGetObjectResp, the returns of the GetObject operation

The member functions are as follows:

// Set the Content-Type parameter in the response header
void SetResponseContentType(const std::string& str);

// Set the Content-Language parameter in the response header
void SetResponseContentLang(const std::string& str);

// Set the Content-Expires parameter in the response header
void SetResponseExpires(const std::string& str);

// Set the Cache-Control parameter in the response header
void SetResponseCacheControl(const std::string& str);

// Set the Content-Disposition parameter in the response header
void SetResponseContentDisposition(const std::string& str);

// Set the Content-Encoding parameter in the response header
void SetResponseContentEncoding(const std::string& str);

In addition to member functions that read common headers, GetObjectResp provides the following member functions:

// Get the time an object was last modified, a date in string format, such as "Wed, 28 Oct 2014 20:30:00 GMT"
std::string GetLastModified();

// Get the object type, indicating whether the object can be appended to an upload operation. Enumerated values: normal, appendable
std::string GetXCosObjectType();

// Get the storage class of the object. Enumerated values: STANDARD, STANDARD_IA
std::string GetXCosStorageClass();

// Return all custom metadata as a map. The map key does not contain the "x-cos-meta-" prefix
std::map<std::string, std::string> GetXCosMetas();

// Get the custom metadata. The parameter can be the "*" in x-cos-meta-*
std::string GetXCosMeta(const std::string& key);

// Get the algorithm used for server-side encryption
std::string GetXCosServerSideEncryption();

Setting object replication

This API is used to copy a file to the destination path.

Method prototype

CosResult PutObjectCopy(const PutObjectCopyReq& req, PutObjectCopyResp* resp)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "sevenyou";

qcloud_cos::PutObjectCopyReq req(bucket_name, object_name);                                                                                                                       
req.SetXCosCopySource("sevenyousouthtest-12345656.cn-south.myqcloud.com/sevenyou_source_obj");
qcloud_cos::PutObjectCopyResp resp;
qcloud_cos::CosResult result = cos.PutObjectCopy(req, &resp);

Parameter description

Parameter	Description
req	PutObjectCopyReq, the request for the PutObjectCopy operation
resp	PutObjectCopyResp, the return of the PutObjectCopy operation

PutObjectCopyReq contains the following member functions:

// Source file URL path. A previous version can be specified using the versionid sub-resource
void SetXCosCopySource(const std::string& str);

// Whether to copy metadata. Enumerated values: Copy, Replaced. Default value: Copy
// If the flag is Copy, the user-defined metadata in the header will be ignored and the object will be copied directly
// If the flag is Replaced, the metadata will be modified based on the header information
// If the destination path is the same as the source path (i.e., when you want to modify the metadata), the flag has to be Replaced
void SetXCosMetadataDirective(const std::string& str);

// If the object has been modified after the specified time, the operation is performed; otherwise, error code 412 is returned.
// This parameter can be used together with x-cos-copy-source-If-None-Match. If it is used together with other conditions, a conflict is returned.
void SetXCosCopySourceIfModifiedSince(const std::string& str);

// If the object has not been modified after the specified time, the operation is performed; otherwise, error code 412 is returned.
// This parameter can be used together with x-cos-copy-source-If-Match. If it is used together with other conditions, a conflict is returned.
void SetXCosCopySourceIfUnmodifiedSince(const std::string& str);

// If the Etag of the object is the same as the specified one, the operation is performed; otherwise, error code 412 is returned.
// This parameter can be used together with x-cos-copy-source-If-Unmodified-Since. If it is used together with other conditions, a conflict is returned.
void SetXCosCopySourceIfMatch(const std::string& str);

// If the Etag of the object is different from the specified one, the operation is performed; otherwise, error code 412 is returned.
// This parameter can be used together with x-cos-copy-source-If-Modified-Since. If it is used together with other conditions, a conflict is returned.
void SetXCosCopySourceIfNoneMatch(const std::string& str);

// x-cos-storage-class: sets the storage class of an object. Enumerated values: STANDARD, STANDARD_IA
// Default value: STANDARD
void SetXCosStorageClass(const std::string& storage_class);

// Define the ACL attribute of the object. Valid values: private, public-read
// Default value: private
void SetXCosAcl(const std::string& str);

// Grant read permission in the format: id="[OwnerUin]"  
void SetXCosGrantRead(const std::string& str);

// Grant full permission in the format: id="[OwnerUin]"
void SetXCosGrantFullControl(const std::string& str);

// Headers that allow user-customization, will be returned as object metadata of up to 2 KB
void SetXCosMeta(const std::string& key, const std::string& value);

/// Set the algorithm used for server-side encryption. Currently, AES256 is supported
void SetXCosServerSideEncryption(const std::string& str);

PutObjectCopyResp contains the following member functions:

// Return the MD5 checksum of the file. The value of ETag can be used to check whether the object content has changed
std::string GetEtag();

// Return the time the file was last modified in GMT time
std::string GetLastModified();

// Return the version number
std::string GetVersionId();

/// Algorithm used for server-side encryption
std::string GetXCosServerSideEncryption();

Deleting a single object

Feature description

This API is used to delete a specified object in a bucket.

Method prototype

CosResult DeleteObject(const DeleteObjectReq& req, DeleteObjectResp* resp)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "test_object";

qcloud_cos::DeleteObjectReq req(bucket_name, object_name);
qcloud_cos::DeleteObjectResp resp;
qcloud_cos::CosResult result = cos.DeleteObject(req, &resp);

// The call is successful. You can call the resp member functions to get the return content
if (result.IsSucc()) {
    // ...
} else {
    // You can call the CosResult member functions to output the error information, such as requestID
}

Parameter description

Parameter	Description
req	DeleteObjectReq, the request for the DeleteObject operation
resp	DeletObjectResp, the return of the DeletObject operation

Deleting multiple objects

Feature description

This API is used to delete multiple objects from a bucket in a single request.

Method prototype

CosResult DeleteObjects(const DeleteObjectsReq& req, DeleteObjectsResp* resp)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";

std::vector<std::string> objects;
std::vector<ObjectVersionPair> to_be_deleted;
objects.push_back("batch_delete_test_00");
objects.push_back("batch_delete_test_01");
objects.push_back("batch_delete_test_02");
objects.push_back("batch_delete_test_03");
for (size_t idx = 0; idx < objects.size(); ++idx) {
    ObjectVersionPair pair;
    pair.m_object_name = objects[idx];
    to_be_deleted.push_back(pair);
}
qcloud_cos::DeleteObjectsReq req(bucket_name, to_be_deleted);             qcloud_cos::DeleteObjectsResp resp;                                       qcloud_cos::CosResult result = cos.DeleteObjects(req, &resp);
// The call is successful. You can call the resp member functions to get the return content
if (result.IsSucc()) {
    // ...
} else {
    // You can call the CosResult member functions to output the error information, such as requestID
}

Parameter description

Parameter	Description
req	DeleteObjectsReq, the request for the DeleteObjects operation
resp	DeleteObjectsResp, the return of the DeleteObjects operation

DeleteObjectsReq contains the following member functions:

// Add an object and specify the version
void AddObjectVersion(const std::string& object, const std::string& version)
// Add an object with no versioning information
void AddObject(const std::string& object)

DeleteObjectsResp contains the following member functions:

// Get the information of successfully deleted objects
std::vector<DeletedInfo> GetDeletedInfos() const

// Get the information of objects that failed to be deleted
std::vector<ErrorInfo> GetErrorinfos() const

The structures of the corresponding DeletedInfo and ErrorInfo are as follows:

struct DeletedInfo{
    std::string m_key; // Object key
}
struct ErrorInfo{
    std::string m_key; // Object key
    std::string m_code; // error code
    std::string m_message; // Error message
}

Multipart Upload Operations

Querying a multipart upload

Feature description

This API (List Multipart Uploads) is used to query multipart uploads in progress in a specified bucket.

Method prototype

CosResult CosAPI::ListMultipartUpload(const ListMultipartUploadReq& request, ListMultipartUploadResp* response)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "test_object";

qcloud_cos::ListMultipartUploadReq req(bucket_name, object_name);
qcloud_cos::ListMultipartUploadResp resp;
qcloud_cos::CosResult result = cos.ListMultipartUpload(req, &resp);

for (std::vector<qcloud_cos::Upload>::const_iterator itr = rst.begin(); itr != rst.end(); ++itr) {
    const qcloud_cos::Upload& upload = *itr;
    std::cout << "key = " << upload.m_key << ", uploadid= " << upload.m_uploadid << ", storagen class = " << upload.m_storage_class << ", m_initiated= " << upload.m_initiated << std::endl;
}   

// The call is successful. You can call the resp member functions to get the return content
if (result.IsSucc()) {
    // ...
} else {
    // You can call the CosResult member functions to output the error information, such as requestID
}

Parameter description

Parameter	Description
req	ListMultipartUploadReq, the request for the ListMultipartUpload operation
resp	ListMultipartUploadResp, the return of the ListMultipartUpload operation

ListMultipartUploadReq member functions:

// Specify that the returned object keys must have a specified prefix. Note that when a prefix query is used, the returned key will still contain the prefix
void SetPrefix(const std::string& prefix);

// The delimiter is a symbol. Objects that contain the same string between the specified prefix and the first occurrence of the delimiter are grouped together as a set of elements: common prefix. If there is no prefix, the delimiter starts at the beginning of the path
void SetDelimiter(const std::string& delimiter);

// Specify the encoding method of the return value. Valid value: url
void SetEncodingType(const std::string& encoding_type);

// Used together with upload-id-marker. If upload-id-marker is not specified, only the multipart uploads with ObjectNames lexicographically greater than the specified key-marker will be included in the list; otherwise, the multipart uploads with ObjectNames lexicographically greater than the specified key-marker will be included, and any multipart uploads with ObjectNames equal to the key-marker will also be included, provided that they have UploadIDs lexicographically greater than the specified upload-id-marker.
void SetKeyMarker(const std::string& marker);

// Set the maximum number of parts returned between 1 and 1,000. Default value: 1,000
void SetMaxUploads(const std::string& max_uploads);

// Used together with key-marker. If key-marker is not specified, upload-id-marker will be ignored; otherwise, the multipart uploads with ObjectNames lexicographically greater than the specified key-marker will be included in the list, and any multipart uploads with ObjectNames equal to the key-marker will also be included, provided that they have UploadIDs lexicographically greater than the specified upload-id-marker.
void SetUploadIdMarker(const std::string& upload_id_marker);

ListMultipartUploadResp member functions:

// Get the corresponding metadata of an object in a bucket
std::vector<Upload> GetUpload()；
// Bucket name
std::string GetName()；
// Encoding format
std::string GetEncodingType() const；
// By default, entries are listed in UTF-8 binary order starting from the marker
std::string GetMarker() const；
// The entry list starts from this UploadId value
std::string GetUploadIdMarker() const；
// If the returned entries are truncated, then NextKeyMarker is the starting point of the next entry
std::string GetNextKeyMarker() const；
// If the returned entries are truncated, then UploadId is the starting point of the next entry
std::string GetNextUploadIdMarker() const；
// Set the maximum number of multiparts returned, valid values are between 0 and 1,000
std::string GetMaxUploads () const；
// Whether response request entries are truncated, is a boolean value (true or false)
bool IsTruncated()；
// Returned file prefix
std::string GetPrefix() const；
// Get the delimiter 
std::string GetDelimiter() const；
// Identical paths between a specified prefix and the delimiter are grouped into one class and defined as common prefix
std::vector<std::string> GetCommonPrefixes() const

Uploading an object in parts

With multipart upload, you can do the following:

Upload an object in parts, including initializing a multipart upload, uploading parts, and completing the upload of all parts.
Delete uploaded parts.

Initializing a multipart upload

Feature description

This API (Initiate Multipart Upload) is used to initialize a multipart upload and get the corresponding uploadId.

Method prototype

CosResult InitMultiUpload(const InitMultiUploadReq& req, InitMultiUploadResp* resp)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);
std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "object_name";

qcloud_cos::InitMultiUploadReq req(bucket_name, object_name);
qcloud_cos::InitMultiUploadResp resp;
qcloud_cos::CosResult result = cos.InitMultiUpload(req, &resp);

std::string upload_id = "";
if (result.IsSucc()) {
    upload_id = resp.GetUploadId();
}

Parameter description

Parameter	Description
req	InitMultiUploadReq, the request for the InitMultiUpload operation
resp	InitMultiUploadResp, the return of the InitMultiUpload operation

The InitMultiUploadReq member functions are as follows:

// Cache-Control: cache policy as defined in RFC 2616, will be stored as object metadata
void SetCacheControl(const std::string& str);

// Content-Disposition: filename as defined in RFC 2616, will be stored as object metadata
void SetContentDisposition(const std::string& str);

// Content-Encoding: encoding format as defined in RFC 2616, will be stored as object metadata
void SetContentEncoding(const std::string& str);

// Content-Type: content type (MIME) as defined in RFC 2616, will be stored as object metadata
void SetContentType(const std::string& str);

// Expires: file expiration time as defined in RFC 2616, will be stored as object metadata
void SetExpires(const std::string& str);

// Headers that allow user-customization, will be returned as object metadata of up to 2 KB
void SetXCosMeta(const std::string& key, const std::string& value);

// x-cos-storage-class: sets the storage class of an object. Enumerated values: STANDARD, STANDARD_IA, ARCHIVE
// Default value: STANDARD
void SetXCosStorageClass(const std::string& storage_class);

// Define the ACL attribute of the object. Valid values: private, public-read
// Default value: private
void SetXcosAcl(const std::string& str);

// Grant read permission in the format: x-cos-grant-read: id=" ",id=" ".
// When you need to authorize a sub-account, id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>"
// When you need to authorize a root account, id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>"
void SetXcosGrantRead(const std::string& str);

// Grant read-write permission in the format: x-cos-grant-full-control: id=" ",id=" ".
// When you need to authorize a sub-account, id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>",
// When you need to authorize a root account, id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>"
void SetXcosGrantFullControl(const std::string& str);

/// Set the algorithm used for server-side encryption. Currently, AES256 is supported
void SetXCosServerSideEncryption(const std::string& str);

After the request is successfully executed, the returned response will include the bucket, key, and uploadId, which represent respectively the destination bucket of the multipart upload, the object name, and the ID number required by subsequent multipart uploads.

The InitMultiUploadResp member functions are as follows:

std::string GetBucket();
std::string GetKey();
std::string GetUploadId();

/// Algorithm used for server-side encryption
std::string GetXCosServerSideEncryption();

Uploading-parts">

Uploading parts

This API (Upload Part) is used to upload parts.

Method prototype

CosResult UploadPartData(const UploadPartDataReq& request, UploadPartDataResp* response)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "test_object";

// Upload the first part
{
    std::fstream is("demo_5M.part1");
    qcloud_cos::UploadPartDataReq req(bucket_name, object_name, upload_id, is);
    req.SetPartNumber(1);
    // Disable MD5 check. To enable, use req.TurnOnComputeConentMd5(). This feature is enabled by default
    req.TurnOffComputeConentMd5();
    qcloud_cos::UploadPartDataResp resp;
    qcloud_cos::CosResult result = cos.UploadPartData(req, &resp);

    // After the upload is successful, you should record the part number and the returned ETag
    if (result.IsSucc()) {
        etags.push_back(resp.GetEtag());
        part_numbers.push_back(1);
    }
    is.close();
}

// Upload the second part
{
    std::fstream is("demo_5M.part2");
    qcloud_cos::UploadPartDataReq req(bucket_name, object_name,
                                      upload_id, is);
    req.SetPartNumber(2);
    qcloud_cos::UploadPartDataResp resp;
    qcloud_cos::CosResult result = cos.UploadPartData(req, &resp);

    // After the upload is successful, you should record the part number and the returned ETag 
    if (result.IsSucc()) {
        etags.push_back(resp.GetEtag());
        part_numbers.push_back(2);
    }
    is.close();
}

Parameter description

Parameter	Description
req	UploadPartDataReq, the request for the UploadPartData operation
resp	UploadPartDataResp, the return of the UploadPartData operation

When you construct UploadPartDataReq, you need to specify the request APPID, bucket, object, the UploadId obtained after successful initialization, and the uploaded data stream (which you should close after the call is completed).

UploadPartDataReq(const std::string& bucket_name,
                    const std::string& object_name, const std::string& upload_id,
                    std::istream& in_stream);

In addition, you should set the part number for the request, which will also be used when you complete the multipart upload.

void SetPartNumber(uint64_t part_number);

The UploadPartDataResp member functions are as follows:

/// Algorithm used for server-side encryption
std::string GetXCosServerSideEncryption();

Copying parts

This API is used to copy an object as a part.

Method prototype

CosResult UploadPartCopyData(const UploadPartCopyDataReq& request,UploadPartCopyDataResp* response)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "test_object";

std::string upload_id;
std::vector<uint64_t> numbers;
std::vector<std::string> etags;
std::string etag1 = "", etag2 = "";
InitMultiUpload(cos, bucket_name, object_name, &upload_id);

// First part
qcloud_cos::UploadPartCopyDataReq req(bucket_name, object_name, upload_id, 1);
req.SetXCosCopySource("sevenyousouth-1251668577.cos.ap-guangzhou.myqcloud.com/seven_10G.tmp");
req.SetXCosCopySourceRange("bytes=0-1048576000");                         qcloud_cos::UploadPartCopyDataResp resp;                                 qcloud_cos::CosResult result = cos.UploadPartCopyData(req, &resp);
if(result.IsSucc()) {
    etag1 = resp.GetEtag();
}
numbers.push_back(1);
etags.push_back(etag1);

// Second part
qcloud_cos::UploadPartCopyDataReq req2(bucket_name, object_name, upload_id, 2);                                                       req2.SetXCosCopySource("sevenyoutest-7319456.cos.cn-north.myqcloud.com/sevenyou_2G_part");
req2.SetXCosCopySourceRange("bytes=1048576000-2097152000");
qcloud_cos::UploadPartCopyDataResp resp2;
qcloud_cos::CosResult result = cos.UploadPartCopyData(req2, &resp2);
if(result.IsSucc()) {
    etag2 = resp2.GetEtag();
}
numbers.push_back(2)；
etags.push_back(etag2);

CompleteMultiUpload(cos, bucket_name, object_name, upload_id, etags, numbers);

Parameter description

Parameter	Description
req	UploadPartCopyDataReq, the request for the UploadPartCopyData operation
resp	UploadPartCopyDataResp, the return of the UploadPartCopyData operation

/// Set the ID of the multipart copy
void SetUploadId(const std::string& upload_id)
/// Set the number of the multipart copy
void SetPartNumber(uint64_t part_number)
/// Set the source file URL path for the multipart copy. A previous version can be specified using the versionid sub-resource
void SetXCosCopySource(const std::string& src)
/// Set the byte range of the source file in the format: bytes=first-last
void SetXCosCopySourceRange(const std::string& range)
 /// If the object has been modified after the specified time, the operation is performed; otherwise, error code 412 is returned
void SetXCosCopySourceIfModifiedSince(const std::string& date)
/// If the object has not been modified after the specified time, the operation is performed; otherwise, error code 412 is returned
void SetXCosCopySourceIfUnmodifiedSince(const std::string& date)
/// If the Etag of the object is the same as the specified one, the operation is performed; otherwise, error code 412 is returned 
void SetXCosCopySourceIfMatch(const std::string& etag)
/// If the Etag of the object is different from the specified one, the operation is performed; otherwise, error code 412 is returned
void SetXCosCopySourceIfNoneMatch(const std::string& etag)

/// Get the MD5 checksum of the returned file
std::string GetEtag() const
/// Return the time the file was last modified time in GMT time
std::string GetLastModified() const
/// Algorithm used for server-side encryption
std::string GetXCosServerSideEncryption() const

Querying uploaded parts

Feature description

This API is used to query uploaded parts in a specified multipart upload operation.

Method prototype

CosResult ListParts(const ListPartsReq& req, ListPartsResp* resp)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "test_object";

// uploadId is obtained after InitMultiUpload is called
qcloud_cos::ListPartsReq req(bucket_name, object_name, upload_id);
req.SetMaxParts(1);                                                                                                                                                               
req.SetPartNumberMarker("1");
qcloud_cos::ListPartsResp resp;
qcloud_cos::CosResult result = cos.ListParts(req, &resp);

// The call is successful. You can call the resp member functions to get the return content
if (result.IsSucc()) {
    // ...
} else {
    // You can call the CosResult member functions to output the error information, such as requestID
}

Parameter description

Parameter	Description
req	ListPartsReq, the request for the ListParts operation
resp	ListPartsResp, the return of the ListParts operation

ListPartsReq contains the following member functions:

// Constructor, bucket name, object name, multipart upload ID
ListPartsReq(const std::string& bucket_name,                                                                                                                                      
             const std::string& object_name,
             const std::string& upload_id); 

// \brief Specify the encoding method of the return value
void SetEncodingType(const std::string& encoding_type);

// \brief Maximum number of entries returned at a time; 1,000 will be used as the default value if not set
void SetMaxParts(uint64_t max_parts);

// \brief By default, entries are listed in UTF-8 binary order starting from the marker
void SetPartNumberMarker(const std::string& part_number_marker);

ListPartsResp contains the following member functions:

// Destination bucket for the multipart upload
std::string GetBucket();

// Specify the encoding method of the return value
std::string GetEncodingType();

// Object name
std::string GetKey();

// ID of the multipart upload
std::string GetUploadId();

// Identify the upload initiator 
Initiator GetInitiator();

// Identify the owner of specified parts
Owner GetOwner();

// By default, entries are listed in UTF-8 binary order starting from the marker
uint64_t GetPartNumberMarker();

// Return the information for each part
std::vector<Part> GetParts();

// If the returned entries are truncated, then NextMarker is the starting point of the next entry
uint64_t GetNextPartNumberMarker();

// Indicate the part storage class. Enumerated values: Standard, Standard_IA, Archive
std::string GetStorageClass();

// Maximum number of entries returned at a time
uint64_t GetMaxParts();

// Whether returned entries are truncated, is a boolean value (TRUE or FALSE)
bool IsTruncated();

Part, Owner, and Initiator are defined as follows:

struct Initiator {
    std::string m_id; // Creator’s unique ID 
    std::string m_display_name; // Creator's username
};

struct Owner {
    std::string m_id; // User’s unique ID
    std::string m_display_name; // Username
};

struct Part {
    uint64_t m_part_num; // Part number
    uint64_t m_size; // Part size in bytes
    std::string m_etag; // MD5 checksum of the object part
    std::string m_last_modified; // Time the part was last modified 
};

Completing a multipart upload

Feature description

The API is used to complete the multipart upload of the entire file.

Method prototype

CosResult CompleteMultiUpload(const CompleteMultiUploadReq& request, CompleteMultiUploadResp* response)

Sample request

qcloud_cos::CompleteMultiUploadReq req(bucket_name, object_name, upload_id);
qcloud_cos::CompleteMultiUploadResp resp;
req.SetEtags(etags);
req.SetPartNumbers(part_numbers);

qcloud_cos::CosResult result = cos.CompleteMultiUpload(req, &resp);

Parameter description

Parameter	Description
req	CompleteMultiUploadReq, the request for the CompleteMultiUpload operation
resp	CompleteMultiUploadResp, the return of the CompleteMultiUpload operation

When you construct CompleteMultiUploadReq, you need to specify the request APPID, bucket, object, and the UploadId obtained after successful initialization.

CompleteMultiUploadReq(const std::string& bucket_name,
                       const std::string& object_name, const std::string& upload_id)

In addition, you need to set the part numbers and Etags of all uploaded parts for the request.

// When calling the following method, you should make sure that the order of the part numbers is the same as that of the ETags.
void SetPartNumbers(const std::vector<uint64_t>& part_numbers);
void SetEtags(const std::vector<std::string>& etags) ;

// Add a pair consisting of a part_number and an ETag
void AddPartEtagPair(uint64_t part_number, const std::string& etag);

/// Set the algorithm used for server-side encryption. Currently, AES256 is supported
void SetXCosServerSideEncryption(const std::string& str);

The return contents of CompleteMultiUploadResp include Location, Bucket, Key, and ETag, which represent respectively the public network access domain name of the created object, the destination bucket for the multipart upload, the name of the object, and the MD5 checksum of the merged file. The following member functions can be called to access the contents of the response.

std::string GetLocation();
std::string GetKey();
std::string GetBucket();
std::string GetEtag();

/// Algorithm used for server-side encryption
std::string GetXCosServerSideEncryption();

Aborting a multipart upload

Feature description

This API is used to abort a multipart upload operation and delete the uploaded parts.

Method prototype

CosResult AbortMultiUpload(const AbortMultiUploadReq& request, AbortMultiUploadResp* response)

Sample request

qcloud_cos::AbortMultiUploadReq req(bucket_name, object_name, upload_id);
qcloud_cos::AbortMultiUploadResp resp;
qcloud_cos::CosResult result = cos.AbortMultiUpload(req, &resp);

Parameter description

Parameter	Description
req	AbortMultiUploadReq, the request for the AbortMultiUpload operation
resp	AbortMultiUploadResp, the return of the AbortMultiUpload operation

When you construct AbortMultiUploadReq, you need to specify the bucket, object, and Upload_id.

AbortMultiUploadReq(const std::string& bucket_name,
                    const std::string& object_name, const std::string& upload_id);

// The download is successful. You can call the MultiGetObjectResp member functions

Other Operations

Restoring an archived object

Feature description

This API is used to retrieve an archived object for access.

Method prototype

CosResult PostObjectRestore(const PostObjectRestoreReq& req, PostObjectRestoreResp* resp)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "sevenyou";

{   
    qcloud_cos::PostObjectRestoreReq req(bucket_name, object_name);
    req.SetExiryDays(30);
    req.SetTier("Standard");
    qcloud_cos::PostObjectRestoreResp resp;
    qcloud_cos::CosResult result = cos.PostObjectRestore(req, &resp);
    // The call is successful. You can call the resp member functions to get the return content
    if (result.IsSucc()) {
        // ...
    } else {
        // You can call the CosResult member functions to output the error information, such as requestID
    } 
}

Parameter description

Parameter	Description
req	PostObjectRestoreReq, the request for the PostObjectRestore operation
resp	PostObjectRestoreResp, the return of the PostObjectRestore operation

PostObjectRestoreReq contains the following member functions:

// Set expiration time of the temporary copy
void SetExiryDays(uint64_t days);

// Enumerated values: Expedited, Standard, Bulk. Default value: Standard
void SetTier(const std::string& tier);

Setting object ACL

Feature description

This API is used to set the ACL for an object.

Method prototype

CosResult PutObjectACL(const PutObjectACLReq& req, PutObjectACLResp* resp)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "sevenyou";

// 1. Set the ACL configuration (through the body. You can set the ACL through either the body or header, but you may only use one of these two methods; otherwise, a conflict will occur)
{   
    qcloud_cos::PutObjectACLReq req(bucket_name, object_name);
    qcloud_cos::Owner owner = {"qcs::cam::uin/xxxxx:uin/xxx", "qcs::cam::uin/xxxxxx:uin/xxxxx" };
    qcloud_cos::Grant grant;
    req.SetOwner(owner);
    grant.m_grantee.m_type = "Group";
    grant.m_grantee.m_uri = "http://cam.qcloud.com/groups/global/AllUsers";
    grant.m_perm = "READ";
    req.AddAccessControlList(grant);

    qcloud_cos::PutObjectACLResp resp;
    qcloud_cos::CosResult result = cos.PutObjectACL(req, &resp);
    // The call is successful. You can call the resp member functions to get the return content
    if (result.IsSucc()) {
        // ...
    } else {
        // Set the ACL. You can call the CosResult member functions to output the error information, such as requestID
    } 
}   

// 2. Set the ACL configuration (through the header. You can set the ACL through either the body or header, but you may only use one of these two methods; otherwise, a conflict will occur)
{   
    qcloud_cos::PutObjectACLReq req(bucket_name, object_name);                                                                                                                    
    req.SetXCosAcl("public-read-write");

    qcloud_cos::PutObjectACLResp resp;
    qcloud_cos::CosResult result = cos.PutObjectACL(req, &resp);
    // The call is successful. You can call the resp member functions to get the return content
    if (result.IsSucc()) {
        // ...
    } else {
        // You can call the CosResult member functions to output the error information, such as requestID
    } 
}

Parameter description

Parameter	Description
req	PutObjectACLReq, the request for the PutObjectACL operation
resp	PutObjectACLResp, the return of the PutObjectACL operation

PutObjectACLReq contains the following member functions:

// Define the ACL attribute of the object. Valid values: private, public-read
// Default value: private
void SetXCosAcl(const std::string& str);

// Grant read permission in the format: id="[OwnerUin]" 
void SetXCosGrantRead(const std::string& str);

// Grant full permission in the format: id="[OwnerUin]"
void SetXCosGrantFullControl(const std::string& str);

// Object owner ID
void SetOwner(const Owner& owner);

// Set grantee and permission information
void SetAccessControlList(const std::vector<Grant>& grants);

// Add the permission information for a single object
void AddAccessControlList(const Grant& grant);

APIs such as SetXCosAcl/SetXCosGrantRead/SetXCosGrantWrite/SetXCosGrantFullControl cannot be used together with SetAccessControlList/AddAccessControlList at the same time. Because the former type is implemented by setting the HTTP header, while the latter is used for adding content in XML format to the body, you can only choose one type. The former type is preferred within the SDK.

ACLRule is defined as follows:

struct Grantee {
    // The type can be RootAccount or SubAccount
    // If the type is RootAccount, you can enter an account ID in the uin field or enter "anyone" (representing all types of users) in place of uin/<OwnerUin> and uin/<SubUin>
    // If the type is RootAccount, uin represents the root account, while Subaccount represents the sub-account
    std::string m_type; 
    std::string m_id; // qcs::cam::uin/<OwnerUin>:uin/<SubUin>
    std::string m_display_name; // Optional
    std::string m_uri;
};

struct Grant {
    Grantee m_grantee; // Resource information of the grantee
    std::string m_perm; // Specify the permission granted to the grantee. Enumerated values: READ, FULL_CONTROL
};

Querying an object ACL

Feature description

This API is used to query the ACL of an object.

Method prototype

CosResult GetObjectACL(const GetObjectACLReq& req, GetObjectACLResp* resp)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "exampleobject";

// The constructor of GetObjectACLReq requires Object_name to be passed in
qcloud_cos::GetObjectACLReq req(bucket_name, object_name);
qcloud_cos::GetObjectACLResp resp;
qcloud_cos::CosResult result = cos.GetObjectACL(req, &resp);

// The call is successful. You can call the resp member functions to get the return content
if (result.IsSucc()) {
    // ...
} else {
    // You can call the CosResult member functions to output the error information, such as requestID
}

Parameter description

Parameter	Description
req	GetObjectACLReq, the request for the GetObjectACL operation
resp	GetObjectACLResp, the return of the GetObjectACL operation

GetObjectACLResp contains the following member functions:

std::string GetOwnerID();
std::string GetOwnerDisplayName();
std::vector<Grant> GetAccessControlList();

Advanced API (Recommended)

Composite upload

Feature description

This API is used to upload a file concurrently by encapsulating various APIs of a multipart upload.

Method prototype

CosResult MultiUploadObject(const MultiUploadObjectReq& request, MultiUploadObjectResp* response)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "exampleobject";
std::string local_file = "./test"

qcloud_cos::MultiUploadObjectReq req(bucket_name, object_name, local_file);
// To keep the chunks alive inside the completion API, we recommend setting a longer timeout period.
req.SetRecvTimeoutInms(1000 * 60);
qcloud_cos::MultiUploadObjectResp resp;
qcloud_cos::CosResult result = cos.MultiUploadObject(req, &resp);

// The call is successful. You can call the resp member functions to get the return content
if (result.IsSucc()) {
    // ...
} else {
    // You can call the CosResult member functions to output the error information, such as requestID
}

Parameter description

Parameter	Description
req	MultiUploadObjectReq, the request for the MultiUploadObject operation
resp	MultiUploadObjectResp, the return of the MultiUploadObject operation

MultiUploadObjectReq contains the following member functions:

// Set the part size. If it is less than 1 MB, it will be calculated as 1 MB. If it is greater than 5 GB, it will be calculated as 5 GB
void SetPartSize(uint64_t bytes)
// Headers that allow user-customization, will be returned as object metadata of up to 2 KB 
void SetXCosMeta(const std::string& key, const std::string& value)
// Set the algorithm used for server-side encryption. Currently, AES256 is supported
void SetXCosServerSideEncryption(const std::string& str)
// Set the internal thread pool size
void SetThreadPoolSize(int size)

MultiUploadObjectResp contains the following member functions:

std::string GetRespTag()
/// Algorithm used for server-side encryption 
std::string GetXCosServerSideEncryption() const

Composite download

Feature description

This API is used to download a file using concurrent ranges.

Method prototype

CosResult GetObject(const MultiGetObjectReq& request, 
MultiGetObjectResp* response)

Sample request

qcloud_cos::CosConfig config("./config.json");
qcloud_cos::CosAPI cos(config);

std::string bucket_name = "examplebucket-1250000000";
std::string object_name = "exampleobject";
std::string file_path = "./test";

qcloud_cos::MultiGetObjectReq req(bucket_name, object_name, file_path);   qcloud_cos::MultiGetObjectResp resp;                                     qcloud_cos::CosResult result = cos.GetObject(req, &resp); 

// The call is successful. You can call the resp member functions to get the return content
if (result.IsSucc()) {
    // ...
} else {
    // You can call the CosResult member functions to output the error information, such as requestID
}

Parameter description

Parameter	Description
req	MultiGetObjectReq, the request for the GetObject operation
resp	MultiGetObjectResp, the return of the GetObject operation

MultiGetObjectReq contains the following member functions:

// Set part size
void SetSliceSize(uint64_t bytes)
// Set thread pool size
void SetThreadPoolSize(int size)

MultiGetObjectResp contains the following member functions:

/// Algorithm used for server-side encryption
std::string GetXCosServerSideEncryption() const

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Recent Pages

Object Operations

Overview

Simple Operations

Querying an object list

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Sample request

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Simply uploading an object

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Method prototype

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Querying object metadata

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Downloading an object

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Setting object replication

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Deleting a single object

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Deleting multiple objects

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Multipart Upload Operations

Querying a multipart upload

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Uploading an object in parts

Initializing a multipart upload

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Uploading parts

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Copying parts

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Querying uploaded parts

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Completing a multipart upload

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Aborting a multipart upload

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Other Operations

Restoring an archived object

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