RE: OpenDir

[Chris Bipes <chris.bipes@xxxxxxxxxxxxxxx>]

Define Null before PN and the statement  Eval dh = OpenDir( PN )  will not
work.  It only works because PN is null terminated do to the way you defined
your constants.  

From the Help Text:

*STRING means that you can pass character strings where a basing
pointer is expected.  When a pointer parameter is prototyped    
with OPTIONS(*STRING), then either a pointer or a character     
expression can be specified as the passed parameter.  If a      
character expression is specified, then the compiler will copy  
the value of the expression to a temporary pointer and add a    
null-terminator at the end.  Then it will pass the address of   
this temporary pointer to the called procedure.                 

Christopher K. Bipes    mailto:ChrisB@Cross-Check.com
Sr. Programmer/Analyst  mailto:Chris_Bipes@Yahoo.com
CrossCheck, Inc.        http://www.cross-check.com
6119 State Farm Drive   Phone: 707 586-0551 x 1102
Rohnert Park CA  94928  Fax: 707 586-1884

If consistency is the hobgoblin of little minds, only geniuses work here.
Karen Herbelin - Readers Digest 3/2000

-----Original Message-----
From: Marcin Sagan [mailto:ITBAMSAG@bh.com.pl]
Sent: Friday, October 27, 2000 8:26 AM
To: RPG400-L@midrange.com
Subject: OpenDir


Hi 
I have such prototype for opendir

d OpenDir         pr              *   ExtProc( 'opendir' ) 
d  Name                           *   Value                
d                                     Options( *String )   

d PN              c                   '/QDLS/SAGAN/'       
d Null             c                   x'00'
d PathName        S             50a 
    
Why I can open dir with this statements
c                   Eval      PathName = '/QDLS/SAGAN/' +Null
c                   Eval      dh = OpenDir( PathName )   
c                   Eval      dh = OpenDir( PN ) 
c                   Eval      dh = OpenDir( '/QDLS/SAGAN/' )

but not with this
c                   Eval      PathName = '/QDLS/SAGAN/' 
c                   Eval      dh = OpenDir( PathName )   

Shouldn't option *String put *Null after PathName?
Why this allow to do it with PN?

TIA

Marcin Sagan
 
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