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Checking Whether Buckets Exist

Last updated: 2022-01-17 12:50:00

    Overview

    This document provides an overview of APIs and SDK code samples related to checking whether a bucket exists.

    API Operation Description
    HEAD Bucket Checking a bucket and its permissions Checks whether a bucket exists and whether you have permission to access it

    SDK API References

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

    Checking Whether a Bucket Exists

    Description

    This API (DoesBucketExist) is used to check whether a bucket exists.

    Note:

    • The DoesBucketExist API is a simple version of the HEAD Bucket API provided by the .NET SDK. It can only be used to check whether a bucket exists and return a Boolean value.
    • To get the details of a bucket, use the bucket extraction API.

    Sample code

    using COSXML.Model.Bucket;
    using COSXML.Auth;
    using System;
    using COSXML;
    namespace COSSnippet
    {
       public class DoesBucketExistModel {
          private CosXml cosXml;
          DoesBucketExistModel() {
           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);
         }
          /// Check whether a bucket exists
         public void DoesBucketExist()
         {
           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";
             DoesBucketExistRequest request = new DoesBucketExistRequest(bucket);
             // Execute the request
             bool existState = cosXml.DoesBucketExist(request);
             // Request succeeded
             Console.WriteLine("bucket exist state is: " + existState);
           }
           catch (COSXML.CosException.CosClientException clientEx)
           {
             // Request failed
             Console.WriteLine("CosClientException: " + clientEx);
           }
           catch (COSXML.CosException.CosServerException serverEx)
           {
             // Request failed
             Console.WriteLine("CosServerException: " + serverEx.GetInfo());
           }
    
         }
          static void Main(string[] args)
         {
           DoesBucketExistModel m = new DoesBucketExistModel();
            /// Check whether a bucket exists
           m.DoesBucketExist();
         }
       }
    }
    
    Note:

    For the complete sample, go to GitHub.

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