本文介绍如何在受版本控制的存储空间（Bucket）中上传文件（Object）。
简单上传
在已开启版本控制的Bucket中，OSS会为新添加的Object自动生成唯一的版本ID，并在响应header中通过x-oss-version-id形式返回。在暂停了版本控制的Bucket中，新添加的Object的版本ID为“null”，上传同名Object，后一次会覆盖前一次上传的文件内容。OSS保证同一个Object只会有一个版本的ID为“null”。
以下代码用于简单上传：
#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;
int main(void)
{
/*初始化OSS账号信息*/
std::string AccessKeyId = "yourAccessKeyId";
std::string AccessKeySecret = "yourAccessKeySecret";
std::string Endpoint = "yourEndpoint";
std::string BucketName = "yourBucketName";
std::string ObjectName = "yourObjectName";
/*初始化网络等资源*/
InitializeSdk();
ClientConfiguration conf;
OssClient client(Endpoint, AccessKeyId, AccessKeySecret, conf);
std::shared_ptr<std::iostream> content = std::make_shared<std::stringstream>();
*content << "test cpp sdk";
PutObjectRequest request(BucketName, ObjectName, content);
/* 上传文件 */
auto outcome = client.PutObject(request);
if (outcome.isSuccess()) {
std::cout << "versionid:" << outcome.result().VersionId() << std::endl;
}
else {
/* 异常处理 */
std::cout << "PutObject fail" <<
",code:" << outcome.error().Code() <<
",message:" << outcome.error().Message() <<
",requestId:" << outcome.error().RequestId() << std::endl;
ShutdownSdk();
return -1;
}
/* 释放网络等资源 */
ShutdownSdk();
return 0;
}简单上传的详细信息请参见PutObject。
追加上传
在受版本控制的Bucket中，仅支持对于当前版本为Appendable类型的Object执行追加（AppendObject）操作，不支持对于历史版本为Appendable类型的Object执行AppendObject操作。
说明
- 对当前版本为Appendable类型的Object执行AppendObject操作时，OSS不会为该Appendable类型的Object生成历史版本。
- 对当前版本为Appendable类型的Object执行PutObject或DeleteObject操作时，OSS会将该Appendable类型的Object保留为历史版本，且该Object不允许继续追加。
- 不支持对当前版本为非Appendable类型的Object（包括 Normal Object、Delete Marker等）执行AppendObject 操作。
- 目标Bucket在开启或暂停版本控制状态下，不支持对Appendable类型Object执行拷贝操作。
以下代码用于追加上传：
#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;
int main(void)
{
/* 初始化OSS账号信息 */
std::string AccessKeyId = "yourAccessKeyId";
std::string AccessKeySecret = "yourAccessKeySecret";
std::string Endpoint = "yourEndpoint";
std::string BucketName = "yourBucketName";
std::string ObjectName = "yourObjectName";
/* 初始化网络等资源 */
InitializeSdk();
ClientConfiguration conf;
OssClient client(Endpoint, AccessKeyId, AccessKeySecret, conf);
auto meta = ObjectMetaData();
meta.setContentType("text/plain");
/* 第一次追加的位置是0，返回值为下一次追加的位置。后续追加的位置是追加前文件的长度。*/
std::shared_ptr<std::iostream> content1 = std::make_shared<std::stringstream>();
*content1 <<"Thank you for using Aliyun Object Storage Service!";
AppendObjectRequest request(BucketName, ObjectName, content1, meta);
request.setPosition(0L);
/*第一次追加文件*/
auto result = client.AppendObject(request);
/*查看本次执行追加文件的object的版本id*/
if (result.isSuccess()) {
std::cout << "versionid:" << result.result().VersionId() << std::endl;
}
else {
/* 异常处理 */
std::cout << "AppendObject fail" <<
",code:" << result.error().Code() <<
",message:" << result.error().Message() <<
",requestId:" << result.error().RequestId() << std::endl;
ShutdownSdk();
return -1;
}
std::shared_ptr<std::iostream> content2 = std::make_shared<std::stringstream>();
*content2 <<"Thank you for using Aliyun Object Storage Service!";
auto position = result.result().Length();
AppendObjectRequest appendObjectRequest(BucketName, ObjectName, content2);
appendObjectRequest.setPosition(position);
/*第二次追加文件*/
auto outcome = client.AppendObject(appendObjectRequest);
if (outcome.isSuccess()) {
std::cout << "versionid:" << outcome.result().VersionId() << std::endl;
}
else {
/* 异常处理 */
std::cout << "AppendObject fail" <<
",code:" << outcome.error().Code() <<
",message:" << outcome.error().Message() <<
",requestId:" << outcome.error().RequestId() << std::endl;
ShutdownSdk();
return -1;
}
/*释放网络等资源*/
ShutdownSdk();
return 0;
}追加上传的详细信息请参见AppendObject。
分片上传
在受版本控制的Bucket中，调用CompleteMultipartUpload接口来完成整个文件的分片上传，OSS会为整个文件生成唯一的版本ID，并在响应header中以x-oss-version-id的形式返回。
以下代码用于分片上传：
#include <alibabacloud/oss/OssClient.h>
int64_t getFileSize(const std::string& file)
{
std::fstream f(file, std::ios::in | std::ios::binary);
f.seekg(0, f.end);
int64_t size = f.tellg();
f.close();
return size;
}
using namespace AlibabaCloud::OSS;
int main(void)
{
/* 初始化OSS账号信息 */
std::string AccessKeyId = "yourAccessKeyId";
std::string AccessKeySecret = "yourAccessKeySecret";
std::string Endpoint = "yourEndpoint";
std::string BucketName = "yourBucketName";
std::string ObjectName = "yourObjectName";
/* 初始化网络等资源 */
InitializeSdk();
ClientConfiguration conf;
OssClient client(Endpoint, AccessKeyId, AccessKeySecret, conf);
InitiateMultipartUploadRequest initUploadRequest(BucketName, ObjectName);
/*初始化分片上传事件 */
auto uploadIdResult = client.InitiateMultipartUpload(initUploadRequest);
auto uploadId = uploadIdResult.result().UploadId();
std::string fileToUpload = "yourLocalFilename";
int64_t partSize = 100 * 1024;
PartList partETagList;
auto fileSize = getFileSize(fileToUpload);
int partCount = static_cast<int>(fileSize / partSize);
/* 计算分片个数*/
if (fileSize % partSize != 0) {
partCount++;
}
/*对每一个分片进行上传 */
for (int i = 1; i <= partCount; i++) {
auto skipBytes = partSize * (i - 1);
auto size = (partSize < fileSize - skipBytes) ? partSize : (fileSize - skipBytes);
std::shared_ptr<std::iostream> content = std::make_shared<std::fstream>(fileToUpload, std::ios::in|std::ios::binary);
content->seekg(skipBytes, std::ios::beg);
UploadPartRequest uploadPartRequest(BucketName, ObjectName, content);
uploadPartRequest.setContentLength(size);
uploadPartRequest.setUploadId(uploadId);
uploadPartRequest.setPartNumber(i);
auto uploadPartOutcome = client.UploadPart(uploadPartRequest);
if (uploadPartOutcome.isSuccess()) {
Part part(i, uploadPartOutcome.result().ETag());
partETagList.push_back(part);
}
else {
std::cout << "uploadPart fail" <<
",code:" << uploadPartOutcome.error().Code() <<
",message:" << uploadPartOutcome.error().Message() <<
",requestId:" << uploadPartOutcome.error().RequestId() << std::endl;
}
}
/* 完成分片上传 */
CompleteMultipartUploadRequest request(BucketName, ObjectName);
request.setUploadId(uploadId);
request.setPartList(partETagList);
auto outcome = client.CompleteMultipartUpload(request);
if (outcome.isSuccess()) {
std::cout << "versionid:" << outcome.result().VersionId() << std::endl;
}
else {
/* 异常处理 */
std::cout << "CompleteMultipartUpload fail" <<
",code:" << outcome.error().Code() <<
",message:" << outcome.error().Message() <<
",requestId:" << outcome.error().RequestId() << std::endl;
ShutdownSdk();
return -1;
}
/* 释放网络等资源 */
ShutdownSdk();
return 0;
}分片上传的详细信息请参见CompleteMultipartUpload。
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