Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!cs.utexas.edu!sun-barr!newstop!sun!amdcad!dgcad!dg-rtp!wgate!lanzo
From: lanzo@wgate.UUCP (Mark Lanzo)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: dos.library ACTION_SET_DATE question.
Message-ID: <182@atesysv.UUCP>
Date: 8 Apr 91 19:28:00 GMT
References: <ben.5658@epmooch.UUCP>
Reply-To: lanzo@atesysv.UUCP (Mark Lanzo)
Organization: Wandel & Goltermann Technologies, Inc.
Lines: 55

In a prior article ben@epmooch.UUCP (Rev. Ben A. Mesander) wrote:
 >   I grabbed an excellent program called PickPacket from a fish disk. It's
 >   a great tool to play with dos.library packets. 
    
Another fine product brought to you by those folks at 
the Software Distillery   :-)

 >   I'm trying to set the date on a file with it. The first thing I do is
 >   send an ACTION_LOCATE_OBJECT packet to df1:. I'm trying to set the date
 >   on a file named "df1:ruru". The ACTION_LOCATE_OBJECT packet is filled out
 >   with Arg1: NULL, Arg2: (BSTR) ruru, Arg3: EXCLUSIVE_LOCK.
    
 >   It appears that I get a lock on the file "ruru". So now, I 
 >   send an ACTION_SET_DATE packet with Arg1 being the lock I obtained from
 >   the ACTION_LOCATE_OBJECT packet, and Arg2 being a pointer to a buffer
 >   containing nulls (I want to set the date to "the beginning of time"). 
    
 >   But I get an error back: "Invalid object lock". This happens whether I
 >   give a shared or exclusive lock to the ACTION_SET_DATE packet.


Unfortunately, I can't remember what the exact args for ACTION_SET_DATE
are; but I'll take a few stabs in the dark:

   1.  Pickpacket is incorrectly passing the pointer to the DateStamp
       structure (BPTR vs APTR).

   2.  Pickpacket is prompting for the wrong args, and you need:
       Arg1 = Lock on parent, Arg2 = name of file, Arg3 = Ptr to DateStamp.
       Note that Arg1 can NOT be null.  

Also, try this:

   3a.  Get a lock on DF1:
	  LOCATE_OBJECT:  Arg1=NULL, Arg2=NULL, Arg3=Shared
	  (assume pickpacket returns "FileLock 1").
   3b.  Get a lock on DF1:ruru
	  LOCATE_OBJECT:  Arg1="FileLock 1", Arg2="ruru", Arg3=Shared
	  (assume pickpacket returns "FileLock 2").
   3c.  Now do the SET_DATE, using "FileLock 2".

If this is due to a bug in pickpacket 1.0, then the solution is to wait
until I finish with pickpacket 2.0!

Yes, there really is a Pickpacket 2.0 in the works.  It incorporates
the DOS 2.0 packets, and the 2.0 "3D" look (It is still 1.3 
compatible though).

I'll double-check to see what the correct way to use SET_DATE is.
It definitely does work now in Pickpacket 2.0 -- I spent rather too
much time implementing that particular packet!  [With the new version you
allocate a DateStamp structure and give whatever date you want].

			More to come, ...

				Mark