How do I test if an OPTIONAL parameter is present

[Robert Wallace]

I have a subroutine which contains optional parameters - all or none may be required - none being the default condition.

FUNCTION Getnopsline(OPT infile AS STRING, entryflag AS LONG, infileps AS LONG, terminator AS STRING, trim AS STRING) AS STRING

What is the correct way I should test whether a parameter is used or not - so far all I get is a "subscript error" if I try to find out whether a parameter is present or not.

Or do I need to have at least one parameter as a flag?

Bob
___________________________________________
Later

Found the answer in another PB Forum :

IF ISMISSING(infile) then

[Michael Mattias]

ISMISSING()

(Requires PB/CC 5+ or PB/Win 9+. Compiler version not shown)

[John Thompson]

Thanks, also. I've got to start reading Help more thoroughly upon a new release. I was still using VARPTR.

[Michael Mattias]

> I've got to start reading Help more thoroughly upon a new release

The last two releases (8x, 9x) have had lots of new stuff.

I usually pick up on the 'NEW!' statements and functions Ok, but for the 'IMPROVED!' things I have a heck of a time remembering "hey, that function now has <some new and useful option> ."

MCM