OpenVMS Source Code Demos

BASIC-FOREIGN-CMD.BAS

1000	%title "vax_basic_foreign_cmd.bas"
	%ident "version 1.00"
	!
	!0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
	!1         2         3         4         5         6         7         8         9         0         1         2         3
	!=========================================================================================================================
	! Title  : vax_basic_foreign_cmd.bas
	! Author : Neil S. Rieck	(Waterloo, Ontario, Canada)
	!	 :			(https://neilrieck.net) (mailto:n.rieck@bell.net)
	! Purpose: to demo how to read command line parameters (works like "main(int argc, char *argv[])" in DEC-C)
	! Usage  : this program must be loosely connected to DCL as a foreign command like so:
	!		$command :== $ mypath:myprogram.exe
	!	   then started from DCL like so:
	!		$command param1 param2 param3 (where params are optional command line args)
	! History:
	! 1.00 991126 1. original program
	!=========================================================================================================================
	option type=explicit
	!
	external long function lib$get_foreign( string by desc, string by desc, word by ref, long by ref)
	!
	declare long	rc%	,&
			i%, j%	,&
		string	junk$
	!
	rc% = lib$get_foreign(junk$,,,)
	print "command line params: "; junk$
	!
	if junk$ <> "" then
	    junk$ = junk$ + " "					! add a trailing space
	    junk$ = edit$( junk$, 16%)				! multiple spaces + tabs to one space
	    i% = 1%						! start at char #1
	    j% = 9999%						! for 1st pass thru while/next
	    while j% > 0%
		j% = pos( junk$, " ", i%)			! find next space
		if j% > i% then					! if one was found
		    print "param: "; seg$( junk$, i%, j%-1%)	! then extract the string in between
		    i% = j% + 1%				! advance the starting pointer
		end if
	    next
	end if
	!
	end

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Neil Rieck
Waterloo, Ontario, Canada.