Uploading/downloading to/from Dropbox / OneDrive / Google Drive

[roysubs]

Has anyone been able to automate pushing files up to and pulling from any of these in code?

I don't mind Dropbox / OneDrive / Google Drive, really it's a case of I'll use whichever system has the easiest way to fully automate sending files to/from (as I might do with FTP - I'd prefer to use Dropbox / OneDrive / Google Drive as they are always online and for the small files that I want to send up this would be ideal).