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rougie
Joined: 14 Jun 2006
Posts: 31
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| Storing an array subscript to a member of a structure |
 Posted: Mon Jul 27, 2009 11:18 am |
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Hello,
I have tried the following code in VC++ compiler as a .c module and it compiles without error or warnings and works the way it supposed to. Now, I know that C for PICs does not have the same conformity as C for desktops and might not follow the same compliance rules. So for this reason I am asking this forum if the following code should be coded with slightly different syntax in order to be accomodated to PIC C.
Here is the code:
| Code: |
#include <Dv4685.h> // DEVICE INNITIALIZATIONS
#include <stdlib.h> // CCS LIBRARY STANDARD LIBRARY
#include <stdlibm.h> // CCS LIBRARY (HEAP) MALLOC MODULE
typedef struct tag_lb
{
long (*pmr)[5]; <<< Error points here!
}lb;
lb* create_obj(long (*pmr)[5])
{
lb *ptr_lb = NULL;
ptr_lb = malloc (sizeof *ptr_lb);
ptr_lb->pmr = pmr;
return ptr_lb;
}
void f1(lb *pObj)
{
long t,x=0,y=0;
t = pObj->pmr[x][y];
t = pObj->pmr[0][1];
t = pObj->pmr[0][2];
}
int main()
{
lb *pObj = NULL;
long pmr[][5] = { {195, 194, 193, 111, 111 },
{194, 195, 112, 222, 111 } };
pObj = create_obj(&pmr[0]);
f1(pObj);
free(pObj);
return 0;
} |
Any input as to why I am getting the following error in PCWH CCS compiler version 4.093:
| Quote: | | Error 28 "Kernel.c" Line 8 (6,7): Expecting an identifier |
All feedback is greatly appreciated!
Best regards
Robert |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Jul 27, 2009 12:48 pm |
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It may need typedef'ing of the function pointer before you use it.
See the example at the end of this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=37478
I was able to make it compile by using that method:
| Code: |
#include <18F452.h>
#fuses XT,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=4000000)
//#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
// Typedef a function pointer.
typedef long (*_fptr)(int8);
typedef struct tag_lb
{
_fptr pmr[5];
}lb;
//======================================
void main(void)
{
while(1);
} |
I don't guarantee that any of this works. I don't want to spend a lot
of time working on this. I've done it in the past and there are posts
in the archives on this (function pointers). I just wanted to help you
get past this initial sticking point. A lot of experimentation may be
required to get it to work. |
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rougie
Joined: 14 Jun 2006
Posts: 31
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| Posted: Mon Jul 27, 2009 2:06 pm |
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PCM Programmer,
My question is not related to function pointers. What I am trying to do is pass in the two dimensional array's base address (or subscript) into a function via a pointer of type
long (*pmr)[5]
and then storing this pointer value to the "long (*pmr)[5]; " member of the tag_lb structure. Then, once in the f1() function, I want to retrieve the pointer so I can use it to access the two dimensional array's informations.
Regards
Roberto |
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