Machsupport Forum

Mach Discussion => Mach4 General Discussion => Topic started by: Bill_O on May 12, 2020, 01:53:52 PM

Title: pInst and pcall
Post by: Bill_O on May 12, 2020, 01:53:52 PM

I am looking through some scripts that others have written to see what I can steal or modify.
I came across a script that uses pInst and pcall.
What is the p for?
I understand and have used Inst and call but do not know what they do if p is added.
Hope this is clear enough.

Bill

Title: Re: pInst and pcall
Post by: smurph on May 12, 2020, 07:05:47 PM

I'm not sure about pinst.  I think that is just a variable name.  But pcall is a LUA "Protected Call", hence the "p" in pcall.  It gives a means to trap and handle errors without bombing out the whole LUA chink that is running.  In other words, it is usually used to handle errors gracefully. 

Steve

Title: Re: pInst and pcall
Post by: Bill_O on May 13, 2020, 08:31:16 AM

Steve,

Thanks for the information.

Bill