Object Storage Service:Retrieve object metadata (iOS SDK)

Notes

• Object metadata describes the properties of an object. Metadata includes standard HTTP headers and user-defined metadata. Configure standard HTTP headers to create custom HTTP request policies, such as object cache policies and forced download policies. Configure user-defined metadata for an object to identify its purpose or properties. For more information, see Object metadata.

• The OSS SDK for iOS does not support configuring or modifying object metadata.

Sample code

The following code shows how to retrieve object metadata:

OSSHeadObjectRequest * request = [OSSHeadObjectRequest new];
// Specify the bucket name. For example, examplebucket.
request.bucketName = @"examplebucket";
// Specify the full path of the object. The full path cannot contain the bucket name. For example, exampledir/exampleobject.txt.
request.objectKey = @"exampledir/exampleobject.txt";

OSSTask * headTask = [client headObject:request];

[headTask continueWithBlock:^id(OSSTask *task) {
    if (!task.error) {
        NSLog(@"head object success!");
        OSSHeadObjectResult * result = task.result;
        NSLog(@"header fields: %@", result.httpResponseHeaderFields);
        for (NSString * key in result.objectMeta) {
            NSLog(@"ObjectMeta: %@ - %@", key, [result.objectMeta objectForKey:key]);
        }
    } else {
        NSLog(@"head object failed, error: %@" ,task.error);
    }
    return nil;
}];

References

For a description of the API operation to retrieve object metadata, see GetObjectMeta.