CSV from Multicolumn Listbox

[Jim Q]

Currently, I have a User Input Promt delivering values to a Multicolumn Listbox. 

I need, when a value is True (externally from the while loop), for the multicolumn listbox to spit out the top cued value as a Comma Seperated Value (CSV) string.

Example:
1. External value is true
2. Upper most row of values from listbox taken and placed into CSV string
3. String sent out of while loop (external)

Thank You,
Jim

[smercurio_fc]

Which part are you having problems with, since it's not clear:

• Accessing the first row - You already have the 2D array in the loop, so not sure why you would want to pull the data from the listbox, as that's been formatted to 2 decimal places, so you'd lose accuracy.
• Converting to a comma-delimited string - Use the Array to Spreadsheet String function. See attached pic for example.
• Getting notified of this external value - This depends on what's generating this external value. You can use a queue, or a simple global.

Tip: You should separate the handling of the Stop button from the handling of the button to add a row. In your implementation if you click Stop you're forced to see the dialog to enter a value, even though you're trying to stop.

[Jim Q]

It is my hope to create a dynamic list (of new GPS way points that can be entered at any point in time), which will be cued within the multicolumn listbox.  From there I would like the rows to be taken out one at a time (only when a signal tells it to be pulled out, and the GPS way point has been reached), and placed into a CSV (to be transmitted to a COM port) that will in turn be sent to another device which requires a CSV string.

[smercurio_fc]

Your VI seems to be an extension of the VI that altenbach posted as a response to your query in this thread. What you've put together is a VI, but it lack a design or architecture. Based on the description of what you're trying to accomplish It seems to me that you need to implement a state machine architecture or a simple producer-consumer architecture.