Internet Transfer Control--File Size

I am uploading files to an FTP server using the Internet Transfer Control. I am having no difficulty
putting the files on the server, changing directories, etc. My problem is that I want to check the size
of the files before and after they are uploaded. I have resorted to sending a file that contains the size
of each file along with 24 files that I am sending. The size can then be checked manually, but this
really needs to be an automated process. I am obviously missing something in the use of the SIZE
command with the EXECTUE--I never get anything but 0. I have even tried the FTPGetFileSize API
call, but once again am missing the correct file handle. I'm a neophyte in of all this, and definitely need
some expert input.