Question

我正在尝试在Google云端硬盘上传大型文件，执行Resumable上传。

这是代码流

第1步：使用云服务在Google云端硬盘上创建文件并启动可恢复的上传会话使用put请求

    String fileID = _DriveService.Files.Insert(googleFileBody).Execute().Id;

    //Initiating resumable upload session

    String UploadUrl = null;

    String _putUrl = "https://www.googleapis.com/upload/drive/v2/files/" + fileID  + "?uploadType=resumable";  

    HttpWebRequest httpRequest =  (HttpWebRequest)WebRequest.Create(_putUrl);    
    httpRequest.Headers["Authorization"] = "Bearer " + AccessToken;
    httpRequest.Method = "PUT";
    requestStream = httpRequest.GetRequestStream();
    _webResponse = (HttpWebResponse)httpRequest.GetResponse();

    if (_webResponse.StatusCode == HttpStatusCode.OK)
     {
         //Getting response OK
           UploadUrl = _webResponse.Headers["Location"].ToString();          
     }

步骤2：将块上传到使用UploadUrl。字节数组是256kb的倍数，对此函数的调用在每个块的循环中

    private void AppendFileData(byte[] chunk)
    {
      try
        {
          HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(UploadUrl);
          httpRequest.ContentLength = chunk.Length;
          httpRequest.Headers["Content-Range"] = "bytes " + startOffset + "-" + endOffset+ "/" + sourceFileSize;
          httpRequest.ContentType= MimeType;
          httpRequest.Method = "PUT";

         MemoryStream stream =new MemoryStream(chunk);

          using (System.IO.Stream requestStream = httpRequest.GetRequestStream())
                    {
                        stream.CopyTo(requestStream);
                        requestStream.Flush();
                        requestStream.Close();
                    }

          HttpWebResponse httpResponse = (HttpWebResponse)(httpRequest.GetResponse()); // Throws exception as 
          //System.Net.WebException: The remote server returned an error: (308) Resume Incomplete.
         //at System.Net.HttpWebRequest.GetResponse()
         // There is no data getting appended to file
        // Still executing the append for remaining chunks

        }
      catch(System.Net.WebException ex)
        {
        }
    }

对于我的最后一个不是256KB的倍数的块，我收到错误

System.Net.WebException：远程服务器返回错误：（400）错误的请求。在System.Net.HttpWebRequest.GetResponse（）

我在这段代码中做错了什么？请建议。提前致谢

Mayuresh。

Answer 1

尝试检查最后一个块是否传递了正确的大小而不是整个数组，如forum中所述。 Ali在该论坛中表示“一个潜在的问题是：如果你发送一个字节数组，该数组对于最后一个请求是半空的（即缓冲区的读取量小于块大小）。”以下是resumable upload的示例实现。希望这会有所帮助。

Google云端硬盘上的可恢复上传问题

1 个答案: