(Lianja) Box.com Streaming Upload File

Demonstrates how to upload a file to box.com, streaming the file directly from the filesystem.

Note: This example requires a fix that is included in Chilkat v9.5.0.70 and above.

Chilkat Lianja Extension Download Chilkat Lianja Extension

//  This requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

loRest = createobject("CkRest")

//    Provide a previously obtained OAuth2 access token.
loOauth2 = createobject("CkOAuth2")
loOauth2.AccessToken = "BOX_ACCESS_TOKEN"
loRest.SetAuthOAuth2(loOauth2)

//  First, make the initial connection.
//  A single REST object, once connected, can be used for many Box REST API calls.
//  The auto-reconnect indicates that if the already-established HTTPS connection is closed,
//  then it will be automatically re-established as needed.
llBAutoReconnect = .T.

//  ----------------------------------------------------------------------
//  IMPORTANT: Note that the domain is "upload.box.com", not "api.box.com"
//  ----------------------------------------------------------------------
llSuccess = loRest.Connect("upload.box.com",443,.T.,llBAutoReconnect)
if (llSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    release loOauth2
    return
endif

//  The request body uses the "multipart/form-data" format to transmit two "parts".
//  The first part is called "attributes" and contains a JSON object with information about the file, including the name of the file
//  and the ID of the parent folder. The second part contains the contents of the file.
//  (Note that the name of the second "part" is ignored.)

loRest.AddHeader("Content-Type","multipart/form-data")

//  Provide the content for each part of the request...

//  First the JSON attributes.  Use "0" for the root folder.
//    {"name":"hedgehogs.jpg", "parent":{"id":"0"}}
loJsonAttr = createobject("CkJsonObject")
loJsonAttr.UpdateString("name","hedgehogs.jpg")
loJsonAttr.UpdateString("parent.id","0")

loRest.PartSelector = "1"
loRest.AddHeader("Content-Disposition",'form-data; name="attributes"; ')
loRest.SetMultipartBodyString(loJsonAttr.Emit())

//  The upload will stream directly from a file.
loRest.PartSelector = "2"
loRest.AddHeader("Content-Disposition",'form-data; name="file"; filename="hedgehogs.jpg"')
//  "application/octet-stream" can be safely used for any type file..
loRest.AddHeader("Content-Type","application/octet-stream")

//  IMPORTANT: This example requires Chilkat v9.5.0.70 or later, for a fix that was made in
//  multipart/streaming uploads.
loFileStream = createobject("CkStream")
loFileStream.SourceFile = "qa_data/jpg/hedgehogs.jpg"
loRest.SetMultipartBodyStream(loFileStream)

//  Restore the PartSelector to "0" (for safety, in case something else sends another request on this object)
loRest.PartSelector = "0"

//  Send the multipart/form-data request, which uploads the file by streaming directly from the filesystem.
lcResponseBody = loRest.FullRequestMultipart("POST","/api/2.0/files/content")
if (loRest.LastMethodSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    release loOauth2
    release loJsonAttr
    release loFileStream
    return
endif

//  A 201 is received for a successful upload
if (loRest.ResponseStatusCode <> 201) then
    ? "Box.com upload failed."
    ? "Request header:"
    ? loRest.LastRequestHeader
    ? "---"
    ? "Response status code = " + str(loRest.ResponseStatusCode)
    ? "Response body:"
    ? lcResponseBody
    release loRest
    release loOauth2
    release loJsonAttr
    release loFileStream
    return
endif

? "File uploaded."


release loRest
release loOauth2
release loJsonAttr
release loFileStream