(Lianja) 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 Lianja Extension Download Chilkat Lianja Extension

llSuccess = .T.

// 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.

loGAuth = createobject("CkAuthGoogle")
loGAuth.AccessToken = "GOOGLE-DRIVE-ACCESS-TOKEN"

loRest = createobject("CkRest")

// Connect using TLS.
llBAutoReconnect = .T.
llSuccess = loRest.Connect("www.googleapis.com",443,.T.,llBAutoReconnect)

// 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...
loJson = createobject("CkJsonObject")
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"
loGdCache = createobject("CkCache")
loGdCache.Level = 0
loGdCache.AddRoot("C:/ckCache/googleDrive")

lcFolderId = loGdCache.FetchText("testFolder/abc/123")
if (loGdCache.LastMethodSuccess <> .T.) then
    ? "Filepath not found in cache."
    release loGAuth
    release loRest
    release loJson
    release loGdCache
    return
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")

loFac = createobject("CkFileAccess")

// 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 <> .T.) then
    ? loRest.LastErrorText
    release loGAuth
    release loRest
    release loJson
    release loGdCache
    release loFac
    return
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
    return
endif

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

// Show the full JSON response.
loJson.EmitCompact = .F.
? 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