Forums > Dev

Lhex recompiling

Feb 01 2014 | 7:15 am

Dear List,
I need to build hex message to control my HE50SE caméra.
The message is like 8 digit in hex starting from
00000000 to 7FFF7FFF (4 digit for the pan movement and 4 digit for the tilt movement)
so i use Lhex from Peter Elsea Lobj collection.
This object is limited to 255.
In the C source code there is this sentence
#define MAXSIZE 256
So is it just this number to change and then recompile it to get higher values or is there much more under the hood i don’t even know that it exist??
Thank you for any help or comment.

Lhex.cTXETEIWCˇˇˇˇW¿Që^≤fˇ¿ÅÅRè// lhex file for Max object
// by Peter Elsea, University of California, Santa Cruz
// copyright © 1998, Regents of the University of California
// This code and the object created by it may be modified and/or
// distributed by any means, provided that this copyright and notice
// appear in all subsequent copies and documentation.

#include "ext.h"
#include "ext_common.h"

#define MAXSIZE 256
#define ASSIST_INLET 1

typedef struct lhex
struct object ob;

Symbol *byteSym[256];
Atom outList[MAXSIZE];
int listsize;
int oldListSize;
long nextValue;
int dataPending;
int loHigh;
int nibbleSize;
int nibbleMask;
int maxBytes;
void *outL;
Symbol *messageType;
} Lhex;

void *lhex_new();
void lhex_free();
void lhex_Lists();
void lhex_setConstant();
void lhex_floatConstant();
void lhex_anything();
void lhex_bang();
void lhex_du

Feb 01 2014 | 7:34 am

I had a quick look at the code of Lhex. From what I can see I am pretty sure that if you change the #define MAXSIZE to a higher value it ought to accept longer lists without the need of touching other parts of the code. However I wouldn’t go too crazy. Use the minimum value that serves your purposes (possibly 512 or you might be able to get away even with 1024), but I wouldn’t go much higher than 1024 given that memory for lists is statically allocated in the code. BTW, it’s good to keep it a power of two, that’s why I suggested 512 or 1024…

Good luck

– Luigi

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