B4X

Upload Binary File from Memory

See more Google Drive Examples

This example demonstrates how to upload a binary file from memory. It uploads the file to a subdirectory of our choosing. B4X

Dim success As Boolean = False

success = 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 ChilkatAuthGoogle
gAuth.Initialize("gAuth")
gAuth.AccessToken = "GOOGLE-DRIVE-ACCESS-TOKEN"

Dim rest As ChilkatRest
rest.Initialize("rest")

'  Connect using TLS.
Dim bAutoReconnect As Boolean = True
success = rest.Connect("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 ChilkatJsonObject
json.Initialize
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 ChilkatCache
gdCache.Initialize
gdCache.Level = 0
gdCache.AddRoot("C:/ckCache/googleDrive")

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


Dim parents As ChilkatJsonArray
parents.Initialize
json.AppendArray2("parents", 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 ChilkatFileAccess
fac.Initialize

'  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 = rest.FullRequestMultipart("POST", "/upload/drive/v3/files?uploadType=multipart")
If rest.LastMethodSuccess = False Then
    Log(rest.LastErrorText)
    Return
End If


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


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

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

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

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