Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!oliveb!apple!well!brecher
From: brecher@well.UUCP (Steve Brecher)
Newsgroups: comp.sys.mac.programmer
Subject: Re: help with sublaunching
Message-ID: <11509@well.UUCP>
Date: 4 May 89 01:59:47 GMT
References: <9410@j.cc.purdue.edu>
Reply-To: brecher@well.UUCP (Steve Brecher)
Distribution: usa
Organization: Software Supply, Sunnyvale, CA
Lines: 46


In article <9410@j.cc.purdue.edu>, aib@j.cc.purdue.edu (coleman) writes:

>   I am having major problems with sublaunching. Everytime I try it,
>   I get a system beep, but it exits from there without returning
>   an error code. This was copied mostly from tech note # 126. Any 
>   help would be greatly appreciated.
>   
>   Source is as follows :
> 
> ...
> 
> pascal OSErr LaunchIt( pLnch) /* < 0 means error */
> pLaunchStruct pLnch ;
> {
>       asm {
>        MOVE.L  (A7)+,A0
>         _Launch
>         MOVE.W  D0,(A7)  ; since it MAY return */
>       }
> }
> 
> ...

In technote 126 LaunchIt is declared as an inline routine; that means the
compiler will generate the code at the place where LaunchIt is called. The
MPC C syntax = { <hex code } is not the same as other Cs' Asm directive. Your
compiler may not support inline functions.  The code you have doesn't work as
a real subroutine (C function).  To make LaunchIt into a callable function:

pascal OSErr LaunchIt(pLnch)
 pLaunchStruct pLnch ;
 {
        asm {
         MOVE.L  (A7)+,A1    ; pop return address
     Move.L  (A7)+,A0    ; pop struct pointer
          _Launch
          MOVE.W  D0,(A7)  ; since it MAY return */
     Jmp     (A1)        ; return to caller
        }
 }

(I didn't examine the rest of your code.)
-- 

brecher@well.UUCP (Steve Brecher)