Free bytes on drive

Please help with sample code

I am looking to make a project that must do the following,.

1. go to my network with ip address, user name and password (sometimes you don't need password or user id).

2. Get me the free bytes on each local drive on the server.

3. Get it in to text file ( Server name, drive and free bytes).

I did try it, but could not figure it out, and the code that I did have I lost it, as my hard drive decided not to work anymore.