CS 230 Spring 2005                                                      Assignment 8 – Files                                                                   100 points

Assigned: 03/21/2005

Due: 04/01/2005 at the start of class (but plan on there being another assignment for 3/29 lab)

Pre-Lab (Do Before Lab):  Bring a new disk. Plan out tasks, objects, and events needed for program. Plan out major pseudocode

Main Assignment:

LaSoogle Labs is developing an online radio station in which you create your own personal radio station and music is streamed to you based on what you like and don’t like (like other services already out there).  Your program is a simplification dealing with ranking songs (only). . The program should get from a file (songs.txt) a list of songs and display them in a list box. When the user selects a song from the song list box, the song information should be displayed in a read-only text box or in a label. When a user specifies a rating (0-5) AND selects a “Rate” button, write the rating (song and rating) to a comma-delimited text file for later tabulation (add it to those already in the file), and remove the song from the list box of songs. (DO NOT have the rating recorded immediately upon selection in case of inadvertent click). Provide the rate capability, a clear (song and rating),  and an exit capability.

Hand in:

• Floppy disk with an entire folder containing all files related to the project.  Please set the name of the project to something other than the default name (WindowsApplication1, …)
• Print out of your code.

Miscellaneous:

• Display voter name and ID for selected voter in separate controls – you will need to separate the info, as done in class.
• For validation, ensure when the rate button is selected that the song has been filled in and a valid rating has been entered.   
• After the rate button has been recorded, give the listener some kind of confirmation (e.g. a msgbox) and automatically clear the song and rating choices.
• You must use the filename specified above, so I can easily test a bunch of different programs in a row. Sample files are provided on the assignments page of my www site. In the spirit of thorough testing of programs, you should try other versions of files as well.
• When you remove the song from the song listbox, that will result automatically in a change to the item selected property of the list box, triggering an event. Your event procedure needs to protect against that crashing your program (the selected item will be set to “nothing” which is a built in value – typing it in (nothing) you should see it turn blue.
• We have covered procedures and functions – I recommend that you continue to use them (e.g. validation).

· MAKE SURE YOUR PROGRAM WORKS!

· You must turn on Option Explicit and Option Strict.

· Put YOUR NAME, e-mail address, date and purpose in comments at the beginning of the program.

· You MUST include comments that explain your program in order to get full credit.

· Remember to use meaningful variable names, and indent to show the structure of the program (VB usually does this correctly).

· Put your name on the form as a Label or as part of the form title.

· Try to use good user interface design. Make clear what user needs to do and what the answers mean.