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Querying Object Metadata

Last updated: 2021-12-14 15:44:01

    Overview

    This document provides an overview of APIs and SDK code samples related to querying object metadata.

    API Operation Description
    HEAD Object Querying object metadata Queries the metadata of an object.

    SDK API References

    For the parameters and method description of all the APIs in the SDK, see API Documentation.

    Querying Object Metadata

    Description

    This API is used to query the metadata of an object, including custom headers and ETag.

    Sample code

    using COSXML.Model.Object;
    using COSXML.Auth;
    using System;
    using COSXML;
    namespace COSSnippet
    {
       public class HeadObjectModel {
          private CosXml cosXml;
          HeadObjectModel() {
           CosXmlConfig config = new CosXmlConfig.Builder()
             .SetRegion("COS_REGION") // Set the default region. For abbreviations of COS regions, visit https://www.tencentcloud.com/document/product/436/6224?from_cn_redirect=1.
             .Build();
    
           string secretId = "SECRET_ID";   // SecretId of the TencentCloud API. For more information about how to obtain the API key, see https://console.tencentcloud.com/cam/capi.
           string secretKey = "SECRET_KEY"; // SecretKey of the TencentCloud API. For more information about how to obtain the API key, see https://console.tencentcloud.com/cam/capi.
           long durationSecond = 600;          // Validity period of the request signature in seconds
           QCloudCredentialProvider qCloudCredentialProvider = new DefaultQCloudCredentialProvider(secretId, 
             secretKey, durationSecond);
    
           this.cosXml = new CosXmlServer(config, qCloudCredentialProvider);
         }
          /// Obtain object information
         public void HeadObject()
         {
           //.cssg-snippet-body-start:[head-object]
           try
           {
             // Bucket name in the format of bucketname-APPID. You can get APPID by referring to https://console.tencentcloud.com/developer.
             string bucket = "examplebucket-1250000000";
             string key = "exampleobject"; // Object key
             HeadObjectRequest request = new HeadObjectRequest(bucket, key);
             // Execute the request
             HeadObjectResult result = cosXml.HeadObject(request);
             // Request succeeded
             Console.WriteLine(result.GetResultInfo());
             // Print CRC64 value of the object
             Console.WriteLine(result.crc64ecma);
             // Print ETag of the object
             Console.WriteLine(result.eTag);
           }
           catch (COSXML.CosException.CosClientException clientEx)
           {
             // Request failed
             Console.WriteLine("CosClientException: " + clientEx);
           }
           catch (COSXML.CosException.CosServerException serverEx)
           {
             // Request failed
             Console.WriteLine("CosServerException: " + serverEx.GetInfo());
           }
    
           //.cssg-snippet-body-end
         }
         // .cssg-methods-pragma
          static void Main(string[] args)
         {
           HeadObjectModel m = new HeadObjectModel();
            /// Obtain object information
           m.HeadObject();
           // .cssg-methods-pragma
         }
       }
    }
    
    Note:

    For the complete sample, go to GitHub.

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