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Pointer to pointer?
#280369
07/22/09 12:10
07/22/09 12:10
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Joined: May 2004
Posts: 1,510
Denmark
Claus_N
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Hi, It seems that it is not possible to use a pointer to a pointer in Lite-C - can anyone confirm this? The manual didn't seem to say anything about it  I tried testing it with this code, which resulted in a crash ("invalid arguments"):
void test(RPGItem** _temp)
{
str_cat(_temp.name,"\ntest");
}
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Re: Pointer to pointer?
[Re: Claus_N]
#280373
07/22/09 12:34
07/22/09 12:34
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
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You DEFINATELY CAN use pointers to pointers (to pointers even).
I use them with multi-dimensional arrays often.
Without seeing your RPGItem struct, I cant be sure, but try (in this order)
str_cat(_temp->name,"\ntest");
or
str_cat((_temp)->name,"\ntest");
or
str_cat((*_temp)->name,"\ntest");
The "->" is required, assuming that "name" is a string pointer.
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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Re: Pointer to pointer?
[Re: Claus_N]
#280384
07/22/09 13:22
07/22/09 13:22
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
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Thats right, Ive passed pointer-to-a-pointer's that way without issue before.
Can you post the code that calls the 'test' function.
And the code that builds the data too.
So I can see the logic behind why you need to call it as a pointer-to-a-pointer.
In case theres a bug in that somewhere...
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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Re: Pointer to pointer?
[Re: EvilSOB]
#280387
07/22/09 13:31
07/22/09 13:31
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Joined: May 2004
Posts: 1,510
Denmark
Claus_N
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I was doing it just for testing purposes, though here's the code using the function:
// In function main
RPGItem* testItem;
testItem.type = 2;
testItem.name = testStr;
test(&testItem);
and the struct so far:
typedef struct RPGItem
{
var type;
int cellsX;
int cellsY;
BMAP* bmap;
STRING* name;
} RPGItem;
Edit: this is the first time I'm trying to use Lite-C so it wouldn't surprise me if I missed something  Edit 2: I tried using a pointer-to-a-pointer of an integer instead, and it worked, so I'm probably just missing something  Edit 3 : Tried this and it does work:
void test(RPGItem** _temp)
{
(**_temp).type = 2;
}
Last edited by Claus_N; 07/22/09 13:40.
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Re: Pointer to pointer?
[Re: Claus_N]
#280394
07/22/09 14:04
07/22/09 14:04
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
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Posts: 3,232
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With what you have, you dont need a pointer-to-a-pointer. (all below code is tested)
void _test(RPGItem *_temp)
{
str_cat(_temp->name,"\ntest");
}
// In function main
RPGItem testItem;
testItem.type = 2;
testItem.name = str_create(_chr(testStr));
_test(&testItem);
Unless your items are going into an array like this....
void _test(RPGItem *_temp)
{
str_cat(_temp->name,"\ntest");
}
// In function main
RPGItem *testItem = malloc(sizeof(RPGItem)*20);
var i; for(i=0; i<20; i++) { memset(testItem[i],0,sizeof(RPGItem)); }
testItem[0].type = 2;
testItem[0].name = str_create(_chr(testStr));
_test(&testItem[0]);
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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Re: Pointer to pointer?
[Re: EvilSOB]
#280398
07/22/09 14:19
07/22/09 14:19
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Joined: May 2004
Posts: 1,510
Denmark
Claus_N
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I was just testing whether it was possible in Lite-C, as I would be using it later on while writing my inventory system  (I'm re-writing my old c-script inventory in Lite-C )
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Re: Pointer to pointer?
[Re: Claus_N]
#280400
07/22/09 14:21
07/22/09 14:21
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Joined: Feb 2008
Posts: 3,232
Australia
EvilSOB
Expert
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Expert
Joined: Feb 2008
Posts: 3,232
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Kewl, would be nice to see.
Public use? Or trade secret code? (just curious)
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial
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Re: Pointer to pointer?
[Re: EvilSOB]
#280406
07/22/09 14:33
07/22/09 14:33
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Joined: May 2004
Posts: 1,510
Denmark
Claus_N
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For a small RPG project ( http://www.zofteyez.dk/azarinath/ ). I'll probably make an inventory like this for "public use" later, but it depends on the amount of homework :P
Last edited by Claus_N; 07/22/09 14:33. Reason: typo
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