That's a great find. Good job. I tried it and it works well.

The solution is kinda documented in the Corona SDK API PDF on page 33. It describes "file:setvbuf(mode [,size])." In this case "file:" would be "io:" and defaults to the "standard" I/O device -- which turns out to be the Console Output window.

I never would have thought of the Xcode Organizer Console Output as the standard I/O for the iPhone, but it does make sense. In other systems I've worked on the local terminal was used as a debugging device for inputting commands and displaying debug information.

It looks like the default mode is "full" for full buffering. That's why I saw the output some times when my program was running and when it was stopped.

I don't think it's wise to run in this mode all the time because I'm sure it would affect performance. You could turn it on if you need some real-time help and you may be able to use the file:flush() call to force the output.

This is another good tool to keep in your back pocket.

Thanks again.
Tom

Here is my solution to quickly disable "print()" output in your final release code.
The best solution is to remove all print() statements but as long as you are not using them in time critical areas I think this solution should work.

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local ReleaseBuild = true  -- set to "true" to disable "print()" console output
 
-------------------------------------
-- Conditional "print()"
-- Use "printNow()" to always print
local printNow = print
if ReleaseBuild then
        print = function(val) end
end
-------------------------------------

I guess my code is overkill but I was thinking I could use ReleaseBuild in other places to disable any debug code not related to print().

Tom