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VBScript Examples

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(VBScript) 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 ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

success = 1

'  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.

set gAuth = CreateObject("Chilkat_9_5_0.AuthGoogle")
gAuth.AccessToken = "GOOGLE-DRIVE-ACCESS-TOKEN"

set rest = CreateObject("Chilkat_9_5_0.Rest")

'  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 = 1
success = rest.Connect("www.googleapis.com",443,1,bAutoReconnect)

'  Provide the authentication credentials (i.e. the access token)
success = 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.
set gdCache = CreateObject("Chilkat_9_5_0.Cache")
gdCache.Level = 0
gdCache.AddRoot "C:/ckCache/googleDrive"

fileId = gdCache.FetchText("testFolder/abc/123/penguins.jpg")
If (gdCache.LastMethodSuccess <> 1) Then
    outFile.WriteLine("Filepath not found in cache.")
    WScript.Quit
End If

'  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.
set sbPath = CreateObject("Chilkat_9_5_0.StringBuilder")
success = sbPath.Append("/drive/v3/files/")
success = sbPath.Append(fileId)
success = 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 <> 1) Then
    outFile.WriteLine(rest.LastErrorText)
    WScript.Quit
End If

'  Get the response header.
statusCode = rest.ReadResponseHeader()
If (statusCode <> 200) Then
    outFile.WriteLine("response status code = " & rest.ResponseStatusCode)
    outFile.WriteLine("response status text = " & rest.ResponseStatusText)
    outFile.WriteLine("response header: " & rest.ResponseHeader)

    '  Read the response body (which should be error text or HTML)
    errResponseBody = rest.ReadRespBodyString()
    If (rest.LastMethodSuccess = 1) Then
        outFile.WriteLine("response body: " & errResponseBody)
    End If

    WScript.Quit
End If

'  Read the response body, which should contain the file data.

jpgBytes = rest.ReadRespBodyBinary()
If (rest.LastMethodSuccess <> 1) Then
    outFile.WriteLine(rest.LastErrorText)
    WScript.Quit
End If

'  Save jpgBytes to a file so we can examine the file to verify that it worked.
set fac = CreateObject("Chilkat_9_5_0.FileAccess")
success = fac.WriteEntireFile("qa_output/penguins_out.jpg",jpgBytes)

outFile.WriteLine("File downloaded.")

outFile.Close

 

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