Obtaining Custom Metadata

If you have any questions during the development, post them on the Issues page of GitHub. For details about parameters and usage of each API, see the API Reference.

After an object is successfully downloaded, its custom data is returned.

This example obtains the custom metadata of objectname in bucketname.

The sample code is as follows:

// Initialize configuration parameters.
ObsConfig config = new ObsConfig();
config.Endpoint = "https://your-endpoint";
// Hard-coded or plaintext AK and SK are risky. For security purposes, encrypt your AK and SK before storing them in the configuration file or environment variables. In this example, the AK and SK are stored in environment variables. Before running the code in this example, configure environment variables AccessKeyID and SecretAccessKey.
// Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/intl/en-us/usermanual-ca/ca_01_0003.html.
string accessKey= Environment.GetEnvironmentVariable("AccessKeyID", EnvironmentVariableTarget.Machine);
string secretKey= Environment.GetEnvironmentVariable("SecretAccessKey", EnvironmentVariableTarget.Machine);
// Create an instance of ObsClient.
ObsClient client = new ObsClient(accessKey, secretKey, config);
// Download an object.
try
{
    GetObjectRequest request = new GetObjectRequest()
    {
        BucketName = "bucketname",
        ObjectKey = "objectname",
    };
    using (GetObjectResponse response = client.GetObject(request))
    {
        //Obtain the custom metadata of the object.
        foreach (string key in response.Metadata.Keys)
        {
            Console.WriteLine("key is :" + key + " value is: " + response.Metadata[key]);
        }
        string dest = "savepath";
        if (!File.Exists(dest))
        {
            response.WriteResponseStreamToFile(dest);
        }
        Console.WriteLine("Get object response: {0}", response.StatusCode);
    }
}
catch (ObsException ex)
{
   Console.WriteLine("ErrorCode: {0}", ex.ErrorCode);
   Console.WriteLine("ErrorMessage: {0}", ex.ErrorMessage);
}