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From: c60c-3cf@e260-3f.berkeley.edu (Dan Kogai)
Newsgroups: comp.sys.mac.programmer
Subject: Re: global data in Think C
Message-ID: <1990May8.024609.13256@agate.berkeley.edu>
Date: 8 May 90 02:46:09 GMT
References: <704@dimebox.cs.utexas.edu>
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Organization: UC Bezerkeley
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In article <704@dimebox.cs.utexas.edu> ted@cs.utexas.edu (Ted Woodward) writes:
>Well, I just found out that string constants in Think C 4.0 get put into the
>global data segment...bad move, guys.  Because of this, I have 47K of 'global'
>data...
>So what do I try?  I try this:
>#define NUMELEMS 29
>Str32 *myArray;	/*yes, I did a #include <appletalk.h>*/
>InitElms()
>{	myArray = (Str32 *) NewPtr(sizeof(Str32) * (long) NUMELMS);
>	myArray[0] = "generic text here";
                     ^^^^^^^^^^^^^^^^^^Problem
>}
>
>and get 'illegal operation on array'.  So I can't say:
>Str32 test;
>test = "stuff";
         ^^^^^Problem #2'
>This seems kinda silly.  I'd also like to be able to say something like this:
>myArray = {"generic1","genereic2",...}
             ^^^^^^^^^^^^^^^^^^^^^Problem
>like in a declaration, so I can put the stuff in the heap instead of global
>space...

	Okay, I grokked your problem enough so let me explain.
	You keep forgetting Ptr32 is pascal string!  You have to
put "\p" in case of pascal string.  And you should use pStrCopy() to copy
it down:  String assignment cannot be done with "=" in C.  Second example
is fine except you forgot "\p".   And you also forgot to check null pointer
in case NewPtr() couldn't find enough space.  Plus since you are using
NUMELEM as CONSTANT size of array, why do you have to bother allocating it
dynamically?  Dynamic allocation is necessary only when the size of array
is variant.  In your case you don't even have to bother writhing InitElms()
and it's as simple as:

Str32 myarray[NUMELEM]={
	"\pgeneric string here"
}

	Personally I hate pascal string so I store all string in C convention
and convert it to pascal whenever I need to use pascal string.

---
##################  Dan The "Think C fan" Man
+ ____  __  __   +  (Aka Dan Kogai)
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##################              has nothing 2 do w/ whatever I post, ThanQ.