(Visual Basic 6.0) Upload Binary File from Memory

This example demonstrates how to upload a binary file from memory. It uploads the file to a subdirectory of our choosing.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim success As Long
success = 1

' This example 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.

Dim gAuth As New ChilkatAuthGoogle
gAuth.AccessToken = "GOOGLE-DRIVE-ACCESS-TOKEN"

Dim rest As New ChilkatRest

' Connect using TLS.
Dim bAutoReconnect As Long
bAutoReconnect = 1
success = rest.Connect("www.googleapis.com",443,1,bAutoReconnect)

' Provide the authentication credentials (i.e. the access token)
success = rest.SetAuthGoogle(gAuth)

' -------------------------------------------------------------------------
' A multipart upload to Google Drive needs a multipart/related Content-Type
success = rest.AddHeader("Content-Type","multipart/related")

' Specify each part of the request.

' The 1st part is JSON with information about the file.
rest.PartSelector = "1"
success = rest.AddHeader("Content-Type","application/json; charset=UTF-8")

' Construct the JSON that will contain the metadata about the file data to be uploaded...
Dim json As New ChilkatJsonObject
success = json.AppendString("name","hedgehogs.jpg")
success = json.AppendString("description","A cute photo of two hedgehogs.")
success = json.AppendString("mimeType","image/jpeg")

' To place the file in a folder, we must add a parents[] array to the JSON
' and add the folder 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 find the file ID for the folder "testFolder/abc/123"
Dim gdCache As New ChilkatCache
gdCache.Level = 0
gdCache.AddRoot "C:/ckCache/googleDrive"

Dim folderId As String
folderId = gdCache.FetchText("testFolder/abc/123")
If (gdCache.LastMethodSuccess <> 1) Then
    Debug.Print "Filepath not found in cache."
    Exit Sub
End If

Dim parents As ChilkatJsonArray
Set parents = json.AppendArray("parents")
success = parents.AddStringAt(-1,folderId)

success = rest.SetMultipartBodyString(json.Emit())

' The 2nd part is the file content, which will contain the binary image data.
rest.PartSelector = "2"
success = rest.AddHeader("Content-Type","image/jpeg")

Dim fac As New CkFileAccess
Dim jpgBytes() As Byte
' Read a JPG file from the local filesystem.
jpgBytes = fac.ReadEntireFile("qa_data/jpg/hedgehogs.jpg")

' Add the bytes to our upload
success = rest.SetMultipartBodyBinary(jpgBytes)

Dim jsonResponse As String
jsonResponse = rest.FullRequestMultipart("POST","/upload/drive/v3/files?uploadType=multipart")
If (rest.LastMethodSuccess <> 1) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

' A successful response will have a status code equal to 200.
If (rest.ResponseStatusCode <> 200) Then
    Debug.Print "response status code = " & rest.ResponseStatusCode
    Debug.Print "response status text = " & rest.ResponseStatusText
    Debug.Print "response header: " & rest.ResponseHeader
    Debug.Print "response JSON: " & jsonResponse
    Exit Sub
End If

' Show the JSON response.
success = json.Load(jsonResponse)

' Show the full JSON response.
json.EmitCompact = 0
Debug.Print json.Emit()

' A successful response looks like this:
' {
'   "kind": "drive#file",
'   "id": "0B53Q6OSTWYoldmJ0Z3ZqT2x5MFk",
'   "name": "hedgehogs.jpg",
'   "mimeType": "image/jpeg"
' }

' Get the fileId:
Debug.Print "fileId: " & json.StringOf("id")