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Checking Whether Objects Exist
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Last updated: 2024-02-02 14:36:36
Checking Whether Objects Exist
Last updated: 2024-02-02 14:36:36
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Overview

This document provides an overview of APIs and SDK code samples related to checking whether an object exists.
API
Operation
Description
Querying object metadata
Queries the metadata of an object.

Checking Whether an Object Exists

Description

This API accepts the bucket name and object name parameters as input parameters and return a Boolean value. It is in fact the encapsulation of the HeadObject (querying object metadata) API. To get the detailed metadata of an object, use the API for querying object metadata.

Sample code

using COSXML.Model.Object;
using COSXML.Auth;
using System;
using COSXML;

namespace COSSnippet
{
    public class DoesObjectExistModel {

      private CosXml cosXml;

      DoesObjectExistModel() {
        CosXmlConfig config = new CosXmlConfig.Builder()
          .SetRegion("COS_REGION") // Set the default region. For abbreviations of COS regions, visit https://cloud.tencent.com/document/product/436/6224.
          .Build();

        string secretId = "SECRET_ID";   // SecretId of the TencentCloud API. For more information about how to obtain the API key, see https://console.cloud.tencent.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.cloud.tencent.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);
      }

      /// Check whether an object exists
      public void DoesObjectExist()
      {
        try
        {
          // Bucket name in the format of `BucketName-APPID`. You can get APPID by referring to https://console.cloud.tencent.com/developer.
          string bucket = "examplebucket-1250000000";
          string key = "exampleobject"; // Object key
          DoesObjectExistRequest request = new DoesObjectExistRequest(bucket, key);
          // Execute the request
          bool exist = cosXml.DoesObjectExist(request);
          // Request succeeded
          Console.WriteLine("object exist state is: " + exist);
        }
        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)
      {
        DoesObjectExistModel m = new DoesObjectExistModel();

        /// Check whether an object exists
        m.DoesObjectExist();
        // .cssg-methods-pragma
      }
    }
}

Note:
For the complete sample, go to GitHub.
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