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Path: utzoo!utcs!oscvax!rico
From: rico@oscvax.UUCP
Newsgroups: net.micro.amiga
Subject: Re: Pointers and AllocMem with Aztec
Message-ID: <418@oscvax.UUCP>
Date: Sat, 14-Jun-86 14:48:14 EDT
Article-I.D.: oscvax.418
Posted: Sat Jun 14 14:48:14 1986
Date-Received: Sat, 14-Jun-86 16:22:40 EDT
References: <1868@gitpyr.UUCP>
Reply-To: rico@oscvax.UUCP (Rico Mariani)
Organization: Ontario Science Centre, Toronto
Lines: 52
Summary: 

In article <1868@gitpyr.UUCP> lbg@gitpyr.UUCP writes:
>
>I have spent all day trying to get AllocMem to work with my Aztec
>compiler.  I refuse to break down and use 32-bit integers.  So
>what am I supposed to do??  I have tried the code in the RKM,
>which does not work.  I have tried declaring AllocMem() as:
>  extern APTR         long             APTR
>  extern APTR *       long *           APTR *
>  struct APTR *       char             void
>  struct APTR         char *           void *
>
>None of them work.  They all return a NULL pointer!  BTW, I am not
>as dumb as this looks.  I knew that void would not work.  But take a
>look at Aztec's list of Amiga functions AND at the functions.h file
>in the include directory -- they both list AllocMem as a void of all
>things!!
>
>Thanks, dudes and dudettes!
>
>Lee

Even though Lee asked for replies by mail I thought I'd post this as
well just in case anyone else is stuck on this.  Lee's problem is probably
not how he is declaring Allocmem "char *AllocMem()" should be fine, with
Aztec and 16 bit int's you must be careful how you *call* Allocmem or any
other Resident library routine.  The Amiga library routines all expect
to be passed 32 bit objects i.e. "longs"... so don't use a call like this:


  wrong: foo = (struct bar *) Allocmem( sizeof(struct bar) );

correct: foo = (struct bar *) Allocmem( (long)sizeof(struct bar) );


be especially careful if you are using constants, if you want to allocate
10 bytes, don't say

	foo = Allocmem(10);

say

	foo = Allocmem(10L);


Another warning to novice Aztec users, if you compile with +l to get 32 bit
ints, don't forget to link with the 32 bit library... use c32.lib and m32.lib
they are on the second disk...

	That's all folks...
	  -Rico

	...{ihnp4|allegra|decvax|linus|watmath}!utzoo!oscvax!rico