This topic describes how to upload a file (object) from memory or a local disk.
Usage notes
In this topic, the public endpoint of the China (Hangzhou) region is used. If you want to access OSS from other Alibaba Cloud services in the same region as OSS, use an internal endpoint. For more information about OSS regions and endpoints, see Regions and endpoints.
In this topic, an OSSClient instance is created by using an OSS endpoint. If you want to create an OSSClient by using custom domain names or Security Token Service (STS), see Create an OSSClient instance.
Permissions
By default, an Alibaba Cloud account has full permissions. RAM users or RAM roles under an Alibaba Cloud account do not have any permissions by default. The Alibaba Cloud account or account administrator must grant operation permissions through RAM Policy or Bucket policies.
API | Action | Definition |
PutObject |
| Uploads an object. |
| When uploading an object, if you specify object tags through | |
| When uploading an object, if the object metadata contains | |
|
Upload a file from memory
The following code shows how to upload content from memory to the examplebucket bucket. The content is saved as the exampleobject.txt file in the exampledir folder.
#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;
int main(void)
{
/* Initialize OSS account information. */
/* Set yourEndpoint to the Endpoint of the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the Endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
std::string Endpoint = "yourEndpoint";
/* Set yourRegion to the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the region to cn-hangzhou. */
std::string Region = "yourRegion";
/* Enter the bucket name. For example, examplebucket. */
std::string BucketName = "examplebucket";
/* Enter the full path of the object. The full path cannot contain the bucket name. For example, exampledir/exampleobject.txt. */
std::string ObjectName = "exampledir/exampleobject.txt";
/* Initialize network resources. */
InitializeSdk();
ClientConfiguration conf;
conf.signatureVersion = SignatureVersionType::V4;
/* Obtain access credentials from environment variables. Before you run this sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are set. */
auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
OssClient client(Endpoint, credentialsProvider, conf);
client.SetRegion(Region);
std::shared_ptr<std::iostream> content = std::make_shared<std::stringstream>();
*content << "Thank you for using Alibaba Cloud Object Storage Service!";
PutObjectRequest request(BucketName, ObjectName, content);
/* (Optional) The following example shows how to set the access control list (ACL) to private and the storage class to Standard. */
//request.MetaData().addHeader("x-oss-object-acl", "private");
//request.MetaData().addHeader("x-oss-storage-class", "Standard");
/* Upload the file. */
auto outcome = client.PutObject(request);
if (!outcome.isSuccess()) {
/* Handle the exception. */
std::cout << "PutObject fail" <<
",code:" << outcome.error().Code() <<
",message:" << outcome.error().Message() <<
",requestId:" << outcome.error().RequestId() << std::endl;
return -1;
}
/* Release network resources. */
ShutdownSdk();
return 0;
}Upload a local file
The following code shows how to upload the examplefile.txt file from the D:\\localpath directory to the examplebucket bucket. The file is saved as the exampleobject.txt file in the exampledir folder.
#include <alibabacloud/oss/OssClient.h>
#include <fstream>
using namespace AlibabaCloud::OSS;
int main(void)
{
/* Initialize OSS account information. */
/* Set yourEndpoint to the Endpoint of the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the Endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
std::string Endpoint = "yourEndpoint";
/* Set yourRegion to the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the region to cn-hangzhou. */
std::string Region = "yourRegion";
/* Enter the bucket name. For example, examplebucket. */
std::string BucketName = "examplebucket";
/* Enter the full path of the object. The full path cannot contain the bucket name. For example, exampledir/exampleobject.txt. */
std::string ObjectName = "exampledir/exampleobject.txt";
/* Initialize network resources. */
InitializeSdk();
ClientConfiguration conf;
conf.signatureVersion = SignatureVersionType::V4;
/* Obtain access credentials from environment variables. Before you run this sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are set. */
auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
OssClient client(Endpoint, credentialsProvider, conf);
client.SetRegion(Region);
/* Enter the full path of the local file. For example, D:\\localpath\\examplefile.txt. In this example, localpath is the local directory where the examplefile.txt file is stored. */
std::shared_ptr<std::iostream> content = std::make_shared<std::fstream>("D:\\localpath\\examplefile.txt", std::ios::in | std::ios::binary);
PutObjectRequest request(BucketName, ObjectName, content);
/* (Optional) The following example shows how to set the access control list (ACL) to private and the storage class to Standard. */
//request.MetaData().addHeader("x-oss-object-acl", "private");
//request.MetaData().addHeader("x-oss-storage-class", "Standard");
auto outcome = client.PutObject(request);
if (!outcome.isSuccess()) {
/* Handle the exception. */
std::cout << "PutObject fail" <<
",code:" << outcome.error().Code() <<
",message:" << outcome.error().Message() <<
",requestId:" << outcome.error().RequestId() << std::endl;
return -1;
}
/* Release network resources. */
ShutdownSdk();
return 0;
}