How can I set file:vbuf to "no" on simulator?

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1

Hi.
I'm battling with a pretty obscure crash on my game and I want to be sure the print() output is displayed immediately with no buffer to be able to debug the crash before the simulator freezes.

I've tried using io:stdout:setvbuf("no") but I get an error
attempt to index a nil value (global 'io')

Is there a way to ensure no buffer is used for the simulator's console output?

Thanks ins advance for your help.

2

Not sure if stdout even works with Playdate SDK, but you probably wanted to call io.stdout:setvbuf("no") . : is shorthand for invoking a function with self as the first parameter.

3

Thanks for the help @outgunned .
The ":" on my post was a typo, I actually have it with just the period in my code

io.stdout:setvbuf("no")

and with that I'm getting the error

attempt to index a nil value (global 'io')

So for some reason it is not recognizing the "io" global :thinking:

1 Like
4

If it helps, some of the Lua standard libraries aren't on the Playdate: the package, io and os libraries are completely removed, and the debug library is severely stripped down.

As for immediately flushing stdout, there's no good way to do that -- in Lua at least. In C you can call printf from within the Simulator dynamic library and it'll log to the Simulator's stdout -- but not the in-app console.

2 Likes
5

Thanks scratchminer.
I thought I had a buffer issue because I could see some expected outputs when my game crashed.
It turns out the crash was for some other reason so I'm not even sure there is a buffer for prints anymore. :smiley:

This is the actual issue: Help with error e0 - #6 by optimusdag

Cheers!