对象大于 5GiB 时，您可以使用 uploadPartCopy 接口进行分片拷贝。
对象大于 5GiB 时，需要使用 uploadPartCopy 来进行分片拷贝，包括三个步骤：
以下代码用于将 srcbucket 桶中 srcdir/exampleobject.txt 对象拷贝到 destbucket 桶中，并设置对象对象名为 destdir/exampleobject.txt。
#include "TosClientV2.h"
using namespace VolcengineTos;
int main(void){
// 初始化 TOS 账号信息
// Your Region 填写 Bucket 所在 Region
std::string region = "Your Region";
std::string accessKey = std::getenv("TOS_ACCESS_KEY");
std::string secretKey = std::getenv("TOS_SECRET_KEY");
// 填写 Bucket 名称，例如 destbucket
std::string bucketName = "destbucket";
// 填写Object完整路径，完整路径中不能包含Bucket名称，destdir/exampleobject.txt。
std::string objectName = "destdir/exampleobject.txt";
// 填写 Bucket 名称，例如 srcbucket
std::string srcBucketName = "srcbucket";
// 填写Object完整路径，完整路径中不能包含Bucket名称，srcdir/exampleobject.txt。
std::string srcObjectName = "srcdir/exampleobject.txt";
// 初始化网络等资源
InitializeClient();
// 创建交互的 client
TosClientV2 client(region, accessKey, secretKey);
CreateMultipartUploadInput input_part_create(bucketName, objectName);
auto upload = client.createMultipartUpload(input_part_create);
if (!upload.isSuccess()) {
std::cout << "createMultipartUpload error: " << upload.error().String() << std::endl;
// 释放网络等资源
CloseClient();
return -1;
}
// 获取要copy的对象大小
HeadObjectV2Input headInput(srcBucketName, srcObjectName);
auto headOutput = client.headObject(headInput);
if (!headOutput.isSuccess()) {
std::cout << "head object error: " << headOutput.error().String() << std::endl;
// 释放网络等资源
CloseClient();
return -1;
}
int64_t objectSize = headOutput.result().getContentLength();
// 分片大小 5MB 为例
int partSize = 5 * 1024 * 1024;
int partCount = (int)(objectSize / partSize);
std::vector<UploadedPartV2> copyParts;
// 计算分片个数。
if (objectSize % partSize != 0) {
partCount++;
}
int64_t copySourceRangeEnd_ = 0;
// 对每一个分片进行拷贝。
for (int i = 1; i <= partCount; i++) {
auto offset = partSize * (i - 1);
auto size = (partSize < objectSize - offset) ? partSize : (objectSize - offset);
UploadPartCopyV2Input input(bucketName, objectName, srcBucketName, srcObjectName, i,upload.result().getUploadId());
input.setCopySourceRangeStart(offset);
input.setCopySourceRangeEnd(offset + size - 1);
auto output = client.uploadPartCopy(input);
if (!output.isSuccess()) {
std::cout << "upload part " << i << "failed, error is: " << output.error().String() << std::endl;
// 释放网络等资源
CloseClient();
return -1;
}
UploadedPartV2 temp(output.result().getPartNumber(), output.result().getETag());
copyParts.push_back(temp);
}
CompleteMultipartUploadV2Input input(bucketName, objectName, upload.result().getUploadId(), copyParts);
auto complete = client.completeMultipartUpload(input);
if (!complete.isSuccess()) {
std::cout << "CompleteMultipartUpload error: " << complete.error().String() << std::endl;
// 释放网络等资源
CloseClient();
return -1;
}
// 释放网络等资源
CloseClient();
return 0;
}