默认情况下,在受版本控制的存储空间(Bucket)中调用HeadObject接口仅获取文件(Object)当前版本的meta信息。
说明 如果Object的当前版本为删除标记,则返回404 Not Found。请求参数中指定versionId则返回指定版本Object的meta信息。
以下代码用于获取文件元信息:
#include <alibabacloud/oss/OssClient.h>
#include <alibabacloud/oss/model/ObjectMetaData.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);
/* 获取文件的部分元信息 */
GetObjectMetaRequest request(BucketName, ObjectName);
request.setVersionId("yourObjectVersionId");
auto outcome = client.GetObjectMeta(request);
if (!outcome.isSuccess()) {
/* 异常处理 */
std::cout << "GetObjectMeta fail" <<
",code:" << outcome.error().Code() <<
",message:" << outcome.error().Message() <<
",requestId:" << outcome.error().RequestId() << std::endl;
ShutdownSdk();
return -1;
}
else {
auto metadata = outcome.result();
std::cout << " get metadata success, VersionId:" << metadata.VersionId() << std::endl;
}
/* 获取文件的全部元信息 */
HeadObjectRequest request1(BucketName, ObjectName);
request1.setVersionId("yourObjectVersionId");
outcome = client.HeadObject(request1);
if (!outcome.isSuccess()) {
/* 异常处理 */
std::cout << "HeadObject fail" <<
",code:" << outcome.error().Code() <<
",message:" << outcome.error().Message() <<
",requestId:" << outcome.error().RequestId() << std::endl;
ShutdownSdk();
return -1;
}
else {
auto headMeta = outcome.result();
std::cout << " get headMeta success, VersionId:" << headMeta.VersionId() << std::endl;
}
/* 释放网络等资源 */
ShutdownSdk();
return 0;
}
获取文件元信息的详情请参见HeadObject、GetObjectMeta。
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