(CkPython) Download Binary File to In-Memory Bytes

This example demonstrates how to download the binary content of a file from Google Drive directly into local memory.

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux, Solaris

import sys
import chilkat

success = True

# It requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# This example uses a previously obtained access token having permission for the 
# Google Drive scope.

gAuth = chilkat.CkAuthGoogle()
gAuth.put_AccessToken("GOOGLE-DRIVE-ACCESS-TOKEN")

rest = chilkat.CkRest()

# Connect using TLS.
# A single REST object, once connected, can be used for many Google Drive REST API calls.
# The auto-reconnect indicates that if the already-established HTTPS connection is closed,
# then it will be automatically re-established as needed.
bAutoReconnect = True
success = rest.Connect("www.googleapis.com",443,True,bAutoReconnect)

# Provide the authentication credentials (i.e. the access token)
rest.SetAuthGoogle(gAuth)

# ------------------------------------------------------------------------------
# To download a file, we must know the file ID.
# In a previous example (see Build Local Metadata Cache
# we built a local cache to make it easy to lookup file IDs given a file path.
# Let's say we want to download "testFolder/abc/123/penguins.jpg".
# First we lookup the fileId in the cache.  With the fileId, we can download the file.
gdCache = chilkat.CkCache()
gdCache.put_Level(0)
gdCache.AddRoot("C:/ckCache/googleDrive")

fileId = gdCache.fetchText("testFolder/abc/123/penguins.jpg")
if (gdCache.get_LastMethodSuccess() != True):
    print("Filepath not found in cache.")
    sys.exit()

# We need to send a GET request like this:
# GET https://www.googleapis.com/drive/v3/files/fileId?alt=media
# The fileId is part of the path.
sbPath = chilkat.CkStringBuilder()
sbPath.Append("/drive/v3/files/")
sbPath.Append(fileId)
rest.AddQueryParam("alt","media")

# To download to memory, we'll send the request in one call, then receive
# the response header, and then the response body.
# If the response header indicates failure or an unexpected response, then the
# body is not the data we desire.

# First send the HTTP request.
success = rest.SendReqNoBody("GET",sbPath.getAsString())
if (success != True):
    print(rest.lastErrorText())
    sys.exit()

# Get the response header.
statusCode = rest.ReadResponseHeader()
if (statusCode != 200):
    print("response status code = " + str(rest.get_ResponseStatusCode()))
    print("response status text = " + rest.responseStatusText())
    print("response header: " + rest.responseHeader())

    # Read the response body (which should be error text or HTML)
    errResponseBody = rest.readRespBodyString()
    if (rest.get_LastMethodSuccess() == True):
        print("response body: " + errResponseBody)

    sys.exit()

# Read the response body, which should contain the file data.
jpgBytes = chilkat.CkByteData()
success = rest.ReadRespBodyBinary(jpgBytes)
if (rest.get_LastMethodSuccess() != True):
    print(rest.lastErrorText())
    sys.exit()

# Save jpgBytes to a file so we can examine the file to verify that it worked.
fac = chilkat.CkFileAccess()
fac.WriteEntireFile("qa_output/penguins_out.jpg",jpgBytes)

print("File downloaded.")