(Visual FoxPro) 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

LOCAL lnSuccess
LOCAL loGAuth
LOCAL loRest
LOCAL lnBAutoReconnect
LOCAL loJson
LOCAL loGdCache
LOCAL lcFolderId
LOCAL loParents
LOCAL loFac
LOCAL loJpgBytes
LOCAL lcJsonResponse

lnSuccess = 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.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.AuthGoogle')
loGAuth = CreateObject('Chilkat.AuthGoogle')
loGAuth.AccessToken = "GOOGLE-DRIVE-ACCESS-TOKEN"

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rest')
loRest = CreateObject('Chilkat.Rest')

* Connect using TLS.
lnBAutoReconnect = 1
lnSuccess = loRest.Connect("www.googleapis.com",443,1,lnBAutoReconnect)

* Provide the authentication credentials (i.e. the access token)
loRest.SetAuthGoogle(loGAuth)

* -------------------------------------------------------------------------
* A multipart upload to Google Drive needs a multipart/related Content-Type
loRest.AddHeader("Content-Type","multipart/related")

* Specify each part of the request.

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

* Construct the JSON that will contain the metadata about the file data to be uploaded...
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.AppendString("name","hedgehogs.jpg")
loJson.AppendString("description","A cute photo of two hedgehogs.")
loJson.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"
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cache')
loGdCache = CreateObject('Chilkat.Cache')
loGdCache.Level = 0
loGdCache.AddRoot("C:/ckCache/googleDrive")

lcFolderId = loGdCache.FetchText("testFolder/abc/123")
IF (loGdCache.LastMethodSuccess <> 1) THEN
    ? "Filepath not found in cache."
    RELEASE loGAuth
    RELEASE loRest
    RELEASE loJson
    RELEASE loGdCache
    CANCEL
ENDIF

loParents = loJson.AppendArray("parents")
loParents.AddStringAt(-1,lcFolderId)
RELEASE loParents

loRest.SetMultipartBodyString(loJson.Emit())

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.FileAccess')
loFac = CreateObject('Chilkat.FileAccess')

* Read a JPG file from the local filesystem.
loJpgBytes = loFac.ReadEntireFile("qa_data/jpg/hedgehogs.jpg")

* Add the bytes to our upload
loRest.SetMultipartBodyBinary(loJpgBytes)

lcJsonResponse = loRest.FullRequestMultipart("POST","/upload/drive/v3/files?uploadType=multipart")
IF (loRest.LastMethodSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loGAuth
    RELEASE loRest
    RELEASE loJson
    RELEASE loGdCache
    RELEASE loFac
    CANCEL
ENDIF

* A successful response will have a status code equal to 200.
IF (loRest.ResponseStatusCode <> 200) THEN
    ? "response status code = " + STR(loRest.ResponseStatusCode)
    ? "response status text = " + loRest.ResponseStatusText
    ? "response header: " + loRest.ResponseHeader
    ? "response JSON: " + lcJsonResponse
    RELEASE loGAuth
    RELEASE loRest
    RELEASE loJson
    RELEASE loGdCache
    RELEASE loFac
    CANCEL
ENDIF

* Show the JSON response.
loJson.Load(lcJsonResponse)

* Show the full JSON response.
loJson.EmitCompact = 0
? loJson.Emit()

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

* Get the fileId:
? "fileId: " + loJson.StringOf("id")

RELEASE loGAuth
RELEASE loRest
RELEASE loJson
RELEASE loGdCache
RELEASE loFac