本文介绍如何将 OSS 文件下载到本地文件。

以下代码用于把指定的OSS文件下载到本地文件：

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

int main(void)
{
    /*初始化OSS账号信息*/
    std::string AccessKeyId = "yourAccessKeyId";
    std::string AccessKeySecret = "yourAccessKeySecret";
    std::string Endpoint = "yourEndpoint";
    std::string BucketName = "yourBucketName";
    std::string ObjectName = "yourObjectName";
    /*设置下载文件的文件名*/
    std::string FileNametoSave = "yourFileName";

    /*初始化网络等资源*/
    InitializeSdk();

    ClientConfiguration conf;
    OssClient client(Endpoint, AccessKeyId, AccessKeySecret, conf);

    /*获取文件到本地文件*/
    GetObjectRequest request(BucketName, ObjectName);
    request.setResponseStreamFactory([=]() {return std::make_shared<std::fstream>(FileNametoSave, std::ios_base::out | std::ios_base::in | std::ios_base::trunc| std::ios_base::binary); });

    auto outcome = client.GetObject(request);

    if (outcome.isSuccess()) {    
        std::cout << "GetObjectToFile success" << outcome.result().Metadata().ContentLength() << std::endl;
    }
    else {
        /*异常处理*/
        std::cout << "GetObjectToFile fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        ShutdownSdk();
        return -1;
    }

    /*释放网络等资源*/
    ShutdownSdk();
    return 0;
}