Drive api v3 Can't download file

public static void DLPC(IDownloadProgress downloadProgress)
{
      Console.WriteLine("IDownloadProgress:" + downloadProgress.Status.ToString());
}
//---------
DriveService ds = await GetGoogleDriveService("user");
var filerequest = ds.Files.Get(fileid);
Stream stream_write = new FileStream("D:\\result.txt",FileMode.CreateNew, FileAccess.Write);
filerequest.MediaDownloader.ProgressChanged += DLPC;
filerequest.Download(stream_write);

Console write “IDownloadProgress:Completed” but file size still zero

Version: 1.44.1.1876 (Latest) Framework: C# .net F 4.5

[jskeet]

For the “live” part, can’t you just use the stream that your code would write into as the stream that you pass into the Download method? If that doesn’t work for you for some reason, you could potentially create your own stream implementation, but fundamentally the client library doesn’t provide any way of getting a stream that you can read from. I don’t know about the WebContentLink aspect for private files - but that wouldn’t be specific to the .NET client library anyway. For support on the general API (including the WebContentLink) I would suggest using the options listed on the Drive API support page - I’m afraid the maintainers of this repository know about the API client libraries, but not the details of each specific API.

I’ll close this issue now as I believe it’s been resolved as far as we’re able to help you, i.e. the client library aspect.

[tqk2811]

@mirror222

DriveService ds =…
string uri = string.Format("https://www.googleapis.com/drive/v3/files/{0}?alt=media", fileid);
          return await GD_GetStream(uri, ds.HttpClient, start, end);

private static async Task<Stream> GD_GetStream(string uri, HttpClient httpClient, long? start, long? end)
    {
      var requestMessage = new HttpRequestMessage(HttpMethod.Get, uri);
      requestMessage.Headers.Range = new System.Net.Http.Headers.RangeHeaderValue(start, end);
      var response = await httpClient.SendAsync(requestMessage, HttpCompletionOption.ResponseHeadersRead);
      if (response.IsSuccessStatusCode) return await response.Content.ReadAsStreamAsync();
      else
      {
        if (uri.LastIndexOf("&acknowledgeAbuse=true") >= 0) throw new HttpRequestException(await response.Content.ReadAsStringAsync());
        else return await GD_GetStream(uri += "&acknowledgeAbuse=true", httpClient, start, end);
      }
    }