下载到本地内存

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

int main(void)
{
    /*初始化OSS账号信息。*/
    /*阿里云账号AccessKey拥有所有API的访问权限，风险很高。强烈建议您创建并使用RAM用户进行API访问或日常运维，请登录RAM控制台创建RAM用户。*/
    std::string AccessKeyId = "yourAccessKeyId";
    std::string AccessKeySecret = "yourAccessKeySecret";
    /*填写Bucket所在地域对应的Endpoint。以华东1（杭州）为例，Endpoint填写为https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /*填写Bucket名称。*/
    std::string BucketName = "yourBucketName";
    /*填写不包含Bucket名称在内的Object的完整路径，例如desrfolder/exampleobject.txt。*/
    std::string ObjectName = "yourObjectName";

    /*初始化网络等资源。*/
    InitializeSdk();

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

    /*获取文件到本地内存。*/
    GetObjectRequest request(BucketName, ObjectName);
    auto outcome = client.GetObject(request);
    if (outcome.isSuccess()) {
      std::cout << "getObjectToBuffer" << " success, Content-Length:" << outcome.result().Metadata().ContentLength() << std::endl;
        /*通过read接口读取数据。*/
        auto& stream = outcome.result().Content();
        char buffer[256];
        while (stream->good()) {
            stream->read(buffer, 256);
            auto count = stream->gcount();
            /*根据实际情况处理数据。*/
	    }
    }
    else {
        /*异常处理。*/
        std::cout << "getObjectToBuffer 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;
}