获取文件元信息

实现获取文件元信息(Object Meta)，包括HTTP header和自定义元信息。代码中需要引用"inspurcloud/oss/OssClient.h"类库，使用InspurCloud::OSS命名空间，并初始化账号信息AccessKeyId、AccessKeySecret、Endpoint，示例代码：

        //指定目标文件所存在的桶以及目标文件名称
        std::string BucketName = "yourBucketName";
        std::string ObjectName = "yourObjectName";

        //初始化网络等资源
        InitializeSdk();
        ClientConfiguration conf;
        OssClient client(Endpoint, AccessKeyId, AccessKeySecret, conf);

        //获取文件的全部元信息
        auto outcome = client.HeadObject(BucketName, ObjectName);

        //处理结果
        if (outcome.isSuccess()) {
            auto headMeta = outcome.result();
            std::cout << "headMeta success" << std::endl;
            std::cout << "ContentType:" << headMeta.ContentType() << std::endl;
            std::cout << "ContentLength:" << headMeta.ContentLength() << std::endl;
            std::cout << "CacheControl:" << headMeta.CacheControl() << std::endl;
        }
        // 异常处理
        else {
            std::cout << "HeadObject fail" << std::endl;
            std::cout << "error code:" << outcome.error().Code() << std::endl;
            std::cout << "error message:" << outcome.error().Message() << std::endl;
            std::cout << "requestId:" << outcome.error().RequestId() << std::endl;
            ShutdownSdk();
            return -1;
        }

        //释放资源
        ShutdownSdk();