Path: chuka.playstation.co.uk!chuka.playstation.co.uk!scea!greg_labrec@interactive.sony.com
From: "Wayne K. Werner" <wkwerner@con2.com>
Newsgroups: scea.yaroze.beginners,scea.yaroze.programming.codewarrior
Subject: Re: survival demo and code warrior (mac)
Date: 1 Oct 1997 20:25:22 GMT
Organization: WermX Software
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Spencer Newland <snewland@bod.net> wrote:

> 
> Warning : possible unwanted ';'
> LIBPAD.C line 89   while(!PadRead());
> 
Just a warning about the null line on the pad read.  Ignore it.

> Warning : variable 'i' is not initialized before being used
> MAIN_new.C line 1805   short i, slabid, ballid, enmyid, roboid;
> 
This is a real problem.  i is used without initialization, because it
is just plain wrong.  Earlier in this group, Pradip posted the
correction.  I'll include it here for your convienence:

>> Wayne K. Werner wrote:
>>
>> In converting the survival demo over to CW, I go a warning that
the local
>> variable short i is used before it is initialized.  This is indeed
the
>> case, in the function HandleEnmyCollision() at line 1814 of
main.c:
>> 
>> static short HandleEnmyCollision(OBJECT *objc, short *dx, short
*dy, short
>> *dz)
>> {
>>         short i, slabid, ballid, enmyid, roboid;
>>         short where_onwall, where_onslab, where_onball,
where_onenmy,
>> where_onrobo;
>>         short state = objc->State;
>> 
>>         /* Check the collision of the object with robot */
>>         roboid = -1;
>>         where_onrobo = HandleObjcCollision(objc, &Robo, dx, dy,
dz);
>>         if (where_onrobo & COLLISION_XYZ) {
>>                 if ((Robo.Pos.coord.t[1] - Robo.DifY) <=
>> this is the offending line:
>>                         (Enmy[i].Pos.coord.t[1] - Enmy[i].DifY +
(*dy)))
>>                         roboid = 0;
>>                 else
>>                         roboid = 1;
>>         }
>> 
>> What is the legitamate initialization value?
>> 
>> Thanks,
>> Wayne K. Werner
>> wkwerner@con2.com
>>
>>Yes, that is a mistake.  Instead of "Enmy[i]." I should be using
>>"objc->".  So the line will look like the following
>>
>>(objc->Pos.coord.t[1] - objc->DifY + (*dy))) instead of
>>(Enmy[i].Pos.coord.t[1] - Enmy[i].DifY + (*dy)))
>>
>>I will try to make the change soon and post it back.

>>Pradip K Fatehpuria

> 
> 
> After choosing the file called "AUTO",  all of the file seem to
download
> with no errors.  
> 
> When I hit the play button I get a popup which has the following
text in
> it.... "Illegal (reserved) Instruction Error".  Nothing happen on
the NY
> display making me believe that the illegal instruction error is a
CW
> debugger error?

That's because you are not downloading the executable!  To tell the
truth, I don't know what address you are jumping to if the executable
is not loaded, but, whatever it is, it isn't likely to contain a
legal opcode!

BTW, you must make sure that the program is compiled to start at
address 0x80100000.  This is vitally important.  CW defautlts to
0x8009000.  This load address will overwrite your data.

Good luck,

-- 
Wayne K. Werner
wkwerner@con2.com