(VB.NET UWP/WinRT) 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 Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

Dim success As Boolean = True

' 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 Chilkat.AuthGoogle
gAuth.AccessToken = "GOOGLE-DRIVE-ACCESS-TOKEN"

Dim rest As New Chilkat.Rest

' Connect using TLS.
Dim bAutoReconnect As Boolean = True
success = Await rest.ConnectAsync("www.googleapis.com",443,True,bAutoReconnect)

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

' -------------------------------------------------------------------------
' A multipart upload to Google Drive needs a multipart/related Content-Type
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"
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 Chilkat.JsonObject
json.AppendString("name","hedgehogs.jpg")
json.AppendString("description","A cute photo of two hedgehogs.")
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 Chilkat.Cache
gdCache.Level = 0
gdCache.AddRoot("C:/ckCache/googleDrive")

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


Dim parents As Chilkat.JsonArray = json.AppendArray("parents")
parents.AddStringAt(-1,folderId)


rest.SetMultipartBodyString(json.Emit())

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

Dim fac As New Chilkat.FileAccess
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
rest.SetMultipartBodyBinary(jpgBytes)

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


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


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

' Show the full JSON response.
json.EmitCompact = False
Debug.WriteLine(json.Emit())

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

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