如何在Google Drive Api v3中进行部分下载? [英] How to do a partial download in Google Drive Api v3?

问题描述

文档此处范围标头Range: bytes=500-999.

我的代码

def downloadChunkFromFile(file_id, start, length):
    headers = {"Range": "bytes={}-{}".format(start, start+length)}
    #How do I insert the headers?
    request = drive_service.files().get_media(fileId=file_id)
    fh = io.BytesIO()
    downloader = MediaIoBaseDownload(fh, request, chunksize=length)
    done = False
    while done is False:
        status, done = downloader.next_chunk()
    return fh.getvalue()

我如何使用标题?

推荐答案

• 您要使用带有python的google-api-python-client从Google Drive实现文件的部分下载.
• 您已经能够使用带有脚本的Drive API从Google云端硬盘下载文件.

如果我的理解是正确的，那么这个答案如何?请认为这只是几个可能的答案之一.

If my understanding is correct, how about this answer? Please think of this as just one of several possible answers.

• 在这种情况下，要求标头中包含诸如Range: bytes=500-999之类的range属性.您的问题中已经提到了这一点.
  • 对于request = drive_service.files().get_media(fileId=file_id)，它在标头中包含range属性.
  • In this case, the range property like Range: bytes=500-999 is required to be included in the request header. This has already been mentioned in your question.
    • For request = drive_service.files().get_media(fileId=file_id), it includes the range property in the header.

    修改脚本后，它如下所示.

    When your script is modified, it becomes as follows.

    request = drive_service.files().get_media(fileId=file_id)
    fh = io.BytesIO()
    downloader = MediaIoBaseDownload(fh, request, chunksize=length)
    done = False
    while done is False:
        status, done = downloader.next_chunk()
    return fh.getvalue()
    

    到:

    request = drive_service.files().get_media(fileId=file_id)
    request.headers["Range"] = "bytes={}-{}".format(start, start+length)
    fh = io.BytesIO(request.execute())
    return fh.getvalue()
    

    注意:

    • 在上面修改的脚本中，当使用MediaIoBaseDownload时，发现文件完全下载而不使用range属性.所以我不使用MediaIoBaseDownload.

    • 此外，您也可以按如下方式使用requests.

      Note:

      • In above modified script, when MediaIoBaseDownload is used, it was found that the file is completely downloaded without using the range property. So I don't use MediaIoBaseDownload.

      • Also you can use requests like as follows.

        url = "https://www.googleapis.com/drive/v3/files/" + file_id + "?alt=media"
        headers = {"Authorization": "Bearer ###accessToken###", "Range": "bytes={}-{}".format(start, start+length)}
        res = requests.get(url, headers=headers)
        fh = io.BytesIO(res.content)
        return fh.getvalue()
        

      • 部分下载

      如果我误解了你的问题，而这不是你想要的方向，我深表歉意.

      If I misunderstood your question and this was not the direction you want, I apologize.

      这篇关于如何在Google Drive Api v3中进行部分下载?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！