全部產品
Search

搜尋本產品

    Object Storage Service：C++列舉檔案

    文件中心

    Object Storage Service：C++列舉檔案

    更新時間：Nov 28, 2024

    本文介紹如何列舉指定儲存空間（Bucket）的所有檔案、指定個數的檔案以及指定目錄下的檔案大小等。

    背景資訊

    OSS 檔案按照字母順序排列。您可以通過OssClient.ListObjects列出儲存空間下的檔案。ListObjects有以下三類參數格式：

    • ListObjectOutcome ListObjects(const std::string& bucket) const：列舉儲存空間下的檔案。最多列舉1000個檔案。

    • ListObjectOutcome ListObjects(const std::string& bucket, const std::string& prefix) const： 列舉儲存空間下指定首碼的檔案。最多列舉 1000 個檔案。

    • ListObjectOutcome ListObjects(const ListObjectsRequest& request) const：提供多種過濾功能，實現靈活的查詢功能。

    主要參數及說明如下：

    參數

    描述

    delimiter

    對檔案名稱進行分組的一個字元。所有名稱包含指定的首碼且第一次出現delimiter字元之間的檔案作為一組（commonPrefixes）。

    prefix

    限定返回的檔案必須以prefix作為首碼。

    maxKeys

    限定此次列舉檔案的最大個數。預設值為100，最大值為1000。

    marker

    列舉指定marker之後的檔案。

    注意事項

    • 本文以華東1（杭州）外網Endpoint為例。如果您希望通過與OSS同地區的其他阿里雲產品訪問OSS，請使用內網Endpoint。關於OSS支援的Region與Endpoint的對應關係，請參見OSS地區和訪問網域名稱。

    • 本文以OSS網域名稱建立OSSClient為例。如果您希望通過自訂網域名、STS等方式建立OSSClient，請參見建立OssClient。

    • 要列舉檔案，您必須有oss:ListObjects許可權。具體操作，請參見為RAM使用者授權自訂的權限原則。

    簡單列舉檔案

    以下代碼用於列舉指定儲存空間下的檔案，預設列舉100個檔案。

    #include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS帳號資訊。*/
            
    /* yourEndpoint填寫Bucket所在地區對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫Bucket所在地區對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫Bucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";

    /* 初始化網路等資源。*/
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環境變數中擷取訪問憑證。運行本程式碼範例之前，請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    /* 列舉檔案。*/
    ListObjectsRequest request(BucketName);
    auto outcome = client.ListObjects(request);

    if (!outcome.isSuccess())  {    
        /* 異常處理。*/
        std::cout << "ListObjects fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;  
    }
    else {
        for (const auto& object : outcome.result().ObjectSummarys()) {
            std::cout << "object"<<
            ",name:" << object.Key() <<
            ",size:" << object.Size() <<
            ",lastmodify time:" << object.LastModified() << std:: endl;
         }      
    }

    /* 釋放網路等資源。*/
    ShutdownSdk();
    return 0;
}

    列舉指定個數的檔案

    以下代碼用於列舉指定個數的檔案。

    #include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS帳號資訊。*/
    
    /* yourEndpoint填寫Bucket所在地區對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫Bucket所在地區對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫Bucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";

     /* 初始化網路等資源。*/
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環境變數中擷取訪問憑證。運行本程式碼範例之前，請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    /* 列舉檔案。*/
    ListObjectsRequest request(BucketName);
    /* 設定列舉檔案的最大個數為200。*/
    request.setMaxKeys(200);
    auto outcome = client.ListObjects(request);

    if (!outcome.isSuccess( )) {    
        /* 異常處理。*/
        std::cout << "ListObjects fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;  
    }
    else {
        for (const auto& object : outcome.result().ObjectSummarys()) {
            std::cout << "object"<<
            ",name:" << object.Key() <<
            ",size:" << object.Size() <<
            ",lastmodify time:" << object.LastModified() << std ::endl; 
        }      
    }

    /* 釋放網路等資源。*/
    ShutdownSdk();
    return 0;
}

    列舉指定目錄下的檔案和子目錄

    以下代碼用於列舉指定目錄下的檔案和子目錄： 

    #include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS帳號資訊。*/
            
    /* yourEndpoint填寫Bucket所在地區對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫Bucket所在地區對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫Bucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";
    /* 填寫列舉的檔案首碼（Prefix）。*/
    std::string keyPrefix = "yourkeyPrefix";

     /* 初始化網路等資源。*/
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環境變數中擷取訪問憑證。運行本程式碼範例之前，請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    std::string nextMarker = "";
    bool isTruncated = false;  
    do {
        /* 列舉檔案。*/
        ListObjectsRequest request(BucketName);
         /* 設定正斜線（/）為檔案夾的分隔字元 */
        request.setDelimiter("/");
        request.setPrefix(keyPrefix);
        request.setMarker(nextMarker);
        auto outcome = client.ListObjects(request);

        if (!outcome.isSuccess ()) {    
            /* 異常處理。*/
            std::cout << "ListObjects fail" <<
            ",code:" << outcome.error().Code() <<
            ",message:" << outcome.error().Message() <<
            ",requestId:" << outcome.error().RequestId() << std::endl;
            break;
        }  
        for (const auto& object : outcome.result().ObjectSummarys()) {
            std::cout << "object"<<
            ",name:" << object.Key() <<
            ",size:" << object.Size() <<
            ",lastmodify time:" << object.LastModified() << std::endl;
        }
        for (const auto& commonPrefix : outcome.result().CommonPrefixes()) {
            std::cout << "commonPrefix" << ",name:" << commonPrefix << std::endl;
        }
        nextMarker = outcome.result().NextMarker();
        isTruncated = outcome.result().IsTruncated();
    } while (isTruncated);

    /* 釋放網路等資源。*/
    ShutdownSdk();
    return 0;
}

    列舉指定目錄下的檔案大小

    以下代碼用於擷取指定目錄下的檔案大小：

    #include <iostream>
#include <alibabacloud/oss/OssClient.h>

using namespace AlibabaCloud::OSS;

static int64_t calculateFolderLength(const OssClient &client, const std::string &bucketName, const std::string &folder)
{
    std::string nextMarker = "";
    bool isTruncated = false; 
    int64_t size = 0;
    do {
        /* 列舉檔案。*/
        ListObjectsRequest request(bucketName);
        request.setPrefix(folder);
        request.setMarker(nextMarker);
        auto outcome = client.ListObjects(request);
        if (!outcome.isSuccess()) {    
            /* 異常處理 */
            std::cout << "ListObjects fail" <<
            ",code:" << outcome.error().Code() <<
            ",message:" << outcome.error().Message() <<
            ",requestId:" << outcome.error().RequestId() << std::endl;
            break;
        }  
        for (const auto& object : outcome.result().ObjectSummarys()) {
            size += object.Size();
        }
        nextMarker = outcome.result().NextMarker();
        isTruncated = outcome.result().IsTruncated();
    } while (isTruncated);
    return size;
}

int main(void)
{
    /* 初始化OSS帳號資訊。*/
            
     /* yourEndpoint填寫Bucket所在地區對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫Bucket所在地區對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫Bucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";
    /* 填寫列舉的檔案首碼（Prefix）。*/
    std::string keyPrefix = "yourkeyPrefix";
	
    /* 初始化網路等資源。*/
    InitializeSdk();
    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環境變數中擷取訪問憑證。運行本程式碼範例之前，請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
    std::string nextMarker = "";
    bool isTruncated = false; 
    do {
        /* 列舉檔案。*/
        ListObjectsRequest request(BucketName);
        /* 設定正斜線（/）為檔案夾的分隔字元。*/
        request.setDelimiter("/");
        request.setPrefix(keyPrefix);
        request.setMarker(nextMarker);
        auto outcome = client.ListObjects(request);
        if (!outcome.isSuccess()) {    
            /* 異常處理。*/
            std::cout << "ListObjects fail" <<
            ",code:" << outcome.error().Code() <<
            ",message:" << outcome.error().Message() <<
            ",requestId:" << outcome.error().RequestId() << std::endl;
            break;
        }  
        for (const auto& object : outcome.result().ObjectSummarys()) {
            std::cout << "object" <<
            ",name:" << object.Key() <<
            ",size:" << object.Size() << std::endl;
        }
        for (const auto& commonPrefix : outcome.result().CommonPrefixes()) {
            int64_t foldersize = calculateFolderLength(client, BucketName, commonPrefix);
            std::cout << "folder" <<
            ",name:" << commonPrefix <<
            ",size:" << foldersize << std::endl;
        }
        nextMarker = outcome.result().NextMarker();
        isTruncated = outcome.result().IsTruncated(); 
    } while (isTruncated);
    /* 釋放網路等資源。*/
    ShutdownSdk();
    return 0;
}

    列舉指定首碼的檔案

    以下代碼用於列舉包含指定首碼（prefix）的檔案。

    #include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
     /* 初始化OSS帳號資訊。*/
               
     /* yourEndpoint填寫Bucket所在地區對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
     std::string Endpoint = "yourEndpoint";
     /* yourRegion填寫Bucket所在地區對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
     std::string Region = "yourRegion";
     /* 填寫Bucket名稱，例如examplebucket。*/
     std::string BucketName = "examplebucket";
     /* 填寫列舉的檔案首碼（Prefix）。*/
     std::string keyPrefix = "yourkeyPrefix";

      /* 初始化網路等資源。*/
      InitializeSdk();

      ClientConfiguration conf;
      conf.signatureVersion = SignatureVersionType::V4;
      /* 從環境變數中擷取訪問憑證。運行本程式碼範例之前，請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
  
      std::string nextMarker = "";
      bool isTruncated = false; 
      do {
              /* 列舉檔案。*/
              ListObjectsRequest request(BucketName);              
              request.setPrefix(keyPrefix);
              request.setMarker(nextMarker);
              auto outcome = client.ListObjects(request);

              if (!outcome.isSuccess()) {    
                    /* 異常處理。*/
                    std::cout << "ListObjects fail" <<
                ",code:" << outcome.error().Code() <<
                ",message:" << outcome.error().Message() <<
                ",requestId:" << outcome.error().RequestId() << std::endl;
                        break;
              }
            for (const auto& object : outcome.result().ObjectSummarys()) {
                  std::cout << "object"<<
              ",name:" << object.Key() <<
              ",size:" << object.Size() <<
              ",lastmodify time:" << object.LastModified() << std::endl;
            }      
              nextMarker = outcome.result().NextMarker();
              isTruncated = outcome.result().IsTruncated();
      } while (isTruncated);

      /* 釋放網路等資源。*/
      ShutdownSdk();
      return 0;
}

    列舉指定marker之後的檔案

    參數marker代表檔案名稱。以下代碼用於列舉指定marker之後的檔案。

    #include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
      /* 初始化OSS帳號資訊。*/
                  
      /* yourEndpoint填寫Bucket所在地區對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
      std::string Endpoint = "yourEndpoint";
      /* yourRegion填寫Bucket所在地區對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
      std::string Region = "yourRegion";
      /* 填寫Bucket名稱，例如examplebucket。*/
      std::string BucketName = "examplebucket";
      /* 設定marker。*/
      std::string YourMarker = "yourMarker";

      /* 初始化網路等資源。*/
      InitializeSdk();

      ClientConfiguration conf;
      conf.signatureVersion = SignatureVersionType::V4;
      /* 從環境變數中擷取訪問憑證。運行本程式碼範例之前，請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
      
    ListObjectOutcome outcome;
      do {
              /* 列舉檔案 */
              ListObjectsRequest request(BucketName);
              /* 列舉指定marker之後的檔案 */
              request.setMarker(YourMarker);
              outcome = client.ListObjects(request);

              if (!outcome.isSuccess()) {    
                    /* 異常處理 */
                    std::cout << "ListObjects fail" <<
                ",code:" << outcome.error().Code() <<
                ",message:" << outcome.error().Message() <<
                ",requestId:" << outcome.error().RequestId() << std::endl;
                    break;  
              }
            YourMarker = outcome.result().NextMarker();
            for (const auto& object : outcome.result().ObjectSummarys()) {
                       std::cout << "object"<<
                  ",name:" << object.Key() <<
                ",size:" << object.Size() <<
                ",lastmodify time:" << object.LastModified() << std::endl;
            }      
      } while (outcome.result().IsTruncated());

      /* 釋放網路等資源 */
      ShutdownSdk();
      return 0;
}

    指定檔案名稱編碼

    如果檔案名稱含有以下特殊字元，需要進行編碼傳輸。OSS目前僅支援URL編碼。

    • 單引號（''）

    • 雙引號（""）

    • and符號（&）

    • 角括弧（< >）

    • 中文

    以下代碼用於指定檔案名稱編碼： 

    #include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS帳號資訊。*/
            
    /* yourEndpoint填寫Bucket所在地區對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫Bucket所在地區對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫Bucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";

    /* 初始化網路等資源 */
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環境變數中擷取訪問憑證。運行本程式碼範例之前，請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    std::string nextMarker = "";
    bool isTruncated = false; 
    do {
        /* 列舉檔案。*/
        ListObjectsRequest request(BucketName) ;
        /* 指定檔案名稱編碼。*/
        request.setEncodingType("url");
        request.setMarker(nextMarker);
        auto outcome = client.ListObjects(request);

        if (!outcome.isSuccess() ) {    
            /* 異常處理。*/
            std::cout << "ListObjects fail" <<
            ",code:" << outcome.error().Code() <<
            ",message:" << outcome.error().Message() <<
            ",requestId:" << outcome.error().RequestId() << std::endl;
            break; 
        }
        for (const auto& object : outcome.result().ObjectSummarys()) {
            std::cout << "object"<<
            ",name:" << object.Key() <<
            ",size:" << object.Size() <<
            ",lastmodify time:" << object.LastModified() << std::endl;
        }      
        nextMarker = outcome.result().NextMarker();
        isTruncated = outcome.result().IsTruncated();
    } while (isTruncated);

    /* 釋放網路等資源。*/
    ShutdownSdk();
    return 0;
}

    檔案夾功能

    OSS沒有檔案夾的概念，所有元素都是以檔案來儲存。建立檔案夾本質上來說是建立了一個大小為0並以正斜線（/）結尾的檔案。這個檔案可以被上傳和下載，控制台會對以正斜線（/）結尾的檔案以檔案夾的方式展示。

    通過delimiter和prefix兩個參數可以類比檔案夾功能：

    • 如果設定prefix為某個檔案夾名稱，則會列舉以此prefix開頭的檔案，即該檔案夾下所有的檔案和子檔案夾（目錄）均顯示為objects。

    • 如果在設定了prefix的情況下，將delimiter設定為正斜線（/），則只列舉該檔案夾下的檔案和子檔案夾（目錄），該檔案夾下的子檔案夾（目錄）顯示為CommonPrefixes，子檔案夾下的檔案和檔案夾不顯示。

    假設儲存空間中包含檔案oss.jpg、fun/test.jpg、fun/movie/001.avi和fun/movie/007.avi，以正斜線（/）作為檔案夾的分隔字元。以下樣本說明了如何通過類比檔案夾的方式列舉檔案。

    • 列舉儲存空間下所有檔案

      以下代碼用於列舉指定儲存空間下的所有檔案。

      #include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS帳號資訊。*/
            
    /* yourEndpoint填寫Bucket所在地區對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫Bucket所在地區對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫Bucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";

    /* 初始化網路等資源。*/
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環境變數中擷取訪問憑證。運行本程式碼範例之前，請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    std::string nextMarker = "";
    bool isTruncated = false; 
    do {
        /* 列舉檔案。*/
        ListObjectsRequest request(BucketName);
        request.setMarker(nextMarker);
        auto outcome = client.ListObjects(request);

        if (!outcome.isSuccess()) {    
            /* 異常處理。*/
            std::cout << "ListObjects fail" <<
            ",code:" << outcome.error().Code() <<
            ",message:" << outcome.error().Message() <<
            ",requestId:" << outcome.error().RequestId() << std::endl;
            ShutdownSdk();
            return -1;  
        }
        else {
            for (const auto& object : outcome.result().ObjectSummarys()) {
                std::cout << "object"<<
                ",name:" << object.Key() <<
                ",size:" << object.Size() <<
                ",lastmodify time:" << object.LastModified() << std::endl;
            }      
        }
        nextMarker = outcome.result().NextMarker();
        isTruncated = outcome.result().IsTruncated();
    } while (isTruncated);

    /* 釋放網路等資源。*/
    ShutdownSdk();
    return 0;
}

      返回結果如下：

      Objects:
fun/movie/001.avi
fun/movie/007.avi
fun/test.jpg
oss.jpg

CommonPrefixes:

    • 列舉指定目錄下所有檔案

      以下代碼用於列舉指定目錄下的所有檔案。

      #include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS帳號資訊。*/
            
    /* yourEndpoint填寫Bucket所在地區對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫Bucket所在地區對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫Bucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";

    /* 初始化網路等資源。*/
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環境變數中擷取訪問憑證。運行本程式碼範例之前，請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    std::string nextMarker = "";
    bool isTruncated = false; 
    do {
            /* 列舉檔案。*/
            ListObjectsRequest request(BucketName);
            request.setPrefix("fun/");
            request.setMarker(nextMarker);
            auto outcome = client.ListObjects(request);

            if (!outcome.isSuccess()) {    
                /* 異常處理。*/
                std::cout << "ListObjects fail" <<
                ",code:" << outcome.error().Code() <<
                ",message:" << outcome.error().Message() <<
                ",requestId:" << outcome.error().RequestId() << std::endl;
                break;
            }  
            for (const auto& object : outcome.result().ObjectSummarys()) {
                std::cout << "object"<<
                ",name:" << object.Key() <<
                ",size:" << object.Size() <<
                ",lastmodify time:" << object.LastModified() << std::endl;
            }
            for (const auto& commonPrefix : outcome.result().CommonPrefixes()) {
                std::cout << "commonPrefix" << ",name:" << commonPrefix << std::endl;
            }
            nextMarker = outcome.result().NextMarker();
            isTruncated = outcome.result().IsTruncated();
    } while (isTruncated);

    /* 釋放網路等資源。*/
    ShutdownSdk();
    return 0;
}

      返回結果如下：

      Objects:
fun/movie/001.avi
fun/movie/007.avi
fun/test.jpg

CommonPrefixes:

    • 列舉目錄下的檔案和子目錄

      以下代碼用於列舉指定目錄下的檔案和子目錄。

      #include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS帳號資訊。*/
            
    /* yourEndpoint填寫Bucket所在地區對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫Bucket所在地區對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫Bucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";

    /* 初始化網路等資源。*/
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環境變數中擷取訪問憑證。運行本程式碼範例之前，請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    std::string nextMarker = "";
    bool isTruncated = false;
    do {
            /* 列舉檔案。*/
            ListObjectsRequest request(BucketName);
            /* 設定正斜線（/）為檔案夾的分隔字元 */
            request.setDelimiter("/");
            request.setPrefix("fun/");
            request.setMarker(nextMarker);
            auto outcome = client.ListObjects(request);

            if (!outcome.isSuccess()) {    
                /* 異常處理。*/
                std::cout << "ListObjects fail" <<
                ",code:" << outcome.error().Code() <<
                ",message:" << outcome.error().Message() <<
                ",requestId:" << outcome.error().RequestId() << std::endl;
                break;
            }  
            for (const auto& object : outcome.result().ObjectSummarys()) {
                std::cout << "object"<<
                ",name:" << object.Key() <<
                ",size:" << object.Size() <<
                ",lastmodify time:" << object.LastModified() << std::endl;
            }
            for (const auto& commonPrefix : outcome.result().CommonPrefixes()) {
                std::cout << "commonPrefix" << ",name:" << commonPrefix << std::endl;
            }
            nextMarker = outcome.result().NextMarker();
            isTruncated = outcome.result().IsTruncated();
    } while (isTruncated);

    /* 釋放網路等資源。*/
    ShutdownSdk();
    return 0;
}

      返回結果如下：

      Objects:
fun/test.jpg

CommonPrefixes:
fun/movie/

    • 列舉指定目錄下的檔案大小

      以下代碼用於擷取指定目錄下的檔案大小：

      #include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

static int64_t calculateFolderLength (const OssClient &client, const std::string &bucketName, const std::string &folder)
{
    std::string nextMarker = "";
    bool isTruncated = false;
    int64_t size = 0;
    do {
            /* 列舉檔案。*/
            ListObjectsRequest request(bucketName);
            request.setPrefix(folder);
            request.setMarker(nextMarker);
            auto outcome = client.ListObjects(request);

            if (!outcome.isSuccess()) {    
                /* 異常處理。*/
                std::cout << "ListObjects fail" <<
                ",code:" << outcome.error().Code() <<
                ",message:" << outcome.error().Message() <<
                ",requestId:" << outcome.error().RequestId() << std::endl;
                break;
            }  

            for (const auto& object : outcome.result().ObjectSummarys()) {
                size += object.Size();
            }

            nextMarker = outcome.result().NextMarker();
            isTruncated = outcome.result().IsTruncated();
        } while (isTruncated);

      return size;
}

int main(void)
{   
    /* 初始化OSS帳號資訊。*/
            
    /* yourEndpoint填寫Bucket所在地區對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫Bucket所在地區對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫Bucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";

    /* 初始化網路等資源 */
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環境變數中擷取訪問憑證。運行本程式碼範例之前，請確保已設定環境變數OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    std::string nextMarker = "";
    bool isTruncated = false;
    do {
        /* 列舉檔案。*/
        ListObjectsRequest request(BucketName);
        /* 設定正斜線（/）為檔案夾的分隔字元。*/
        request.setDelimiter("/");
        request.setPrefix("fun/");
        request.setMarker(nextMarker);
        auto outcome = client.ListObjects(request);

        if (!outcome.isSuccess()) {    
            /* 異常處理。*/
            std::cout << "ListObjects fail" <<
            ",code:" << outcome.error().Code() <<
            ",message:" << outcome.error().Message() <<
            ",requestId:" << outcome.error().RequestId() << std::endl;
            break;
        }  

        for (const auto& object : outcome.result().ObjectSummarys()) {
            std::cout << "object" <<
            ",name:" << object.Key() <<
            ",size:" << object.Size() << std::endl;
        }

        for (const auto& commonPrefix : outcome.result().CommonPrefixes()) {
            int64_t foldersize = calculateFolderLength(client, BucketName, commonPrefix);
            std::cout << "folder" <<
            ",name:" << commonPrefix <<
            ",size:" << foldersize << std::endl;
        }
        nextMarker = outcome.result().NextMarker();
        isTruncated = outcome.result().IsTruncated();
    } while (isTruncated);

    /* 釋放網路等資源。*/
    ShutdownSdk();
    return 0;
}

    相關文檔