使用OneDrive Rest API进行块下载

这是我第一次在StackOverflow上写。我的问题是以下。

this is the first time I write on StackOverflow. My question is the following.

我试图写一个基于cpprest sdk CasaBlanca项目的OneDrive C ++ API：

I am trying to write a OneDrive C++ API based on the cpprest sdk CasaBlanca project:

https://casablanca.codeplex.com/

具体来说，我目前正在对OneDrive文件执行读取操作。

In particular, I am currently implementing read operations on OneDrive files.

实际上，我已经能够下载一个包含以下代码的整个文件：

Actually, I have been able to download a whole file with the following code:

http_client api(U("https://apis.live.net/v5.0/"), m_http_config);

api.request(methods::GET, file_id +L"/content" ).then([=](http_response response){
    return response.body();
}).then([=]( istream is){
    streambuf<uint8_t> rwbuf = file_buffer<uint8_t>::open(L"test.txt").get();
    is.read_to_end(rwbuf).get();
    rwbuf.close();
}).wait()

此代码基本上是在计算机上下载整个文件（file_id是我想要下载的文件的ID）。当然，我可以从文件中提取输入流，并使用它来读取文件。

This code is basically downloading the whole file on the computer (file_id is the id of the file I am trying to download). Of course, I can extract an inputstream from the file and using it to read the file.

但是，如果文件很大，这可能会给我带来问题。我想到的是下载文件的一部分，而调用者正在读它（并缓存那部分，如果他回来了）。

However, this could give me issues if the file is big. What I had in mind was to download a part of the file while the caller was reading it (and caching that part if he came back).

然后，我的问题是：

可以使用OneDrive REST + cpprest的存储在OneDrive上的文件。我发现以块的形式上传文件似乎不可能（ OneDrive的分块上传（可恢复上传））。这是真的也下载？

Is it possible, using the OneDrive REST + cpprest downloading a part of a file stored on OneDrive. I have found that uploading files in chunks seems apparently not possible (Chunked upload (resumable upload) for OneDrive?). Is this true also for the download?

提前感谢您的时间。

最好的问候，

Giuseppe