AllocVecTags & FreeVec

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Sun, 2012-04-15 20:22

JosDuchIt

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Last seen: 8 years 1 month ago

Joined: 2012-01-08 20:57

AllocVecTags & FreeVec

Why do i get the crash indicated in the code below?

#define __USE_INLINE__
#include <exec/types.h>
#include <proto/exec.h>
#include <proto/dos.h>
#include <proto/intuition.h>
 
int main (void)
{
struct ColorSpec *g_prefs = NULL; /// test
PutStr("Working\n");
if (!(g_prefs = (struct ColorSpec *)AllocVecTags(sizeof(struct ColorSpec),AVT_ClearWithValue, 0, TAG_DONE)))
	{ 	PutStr("No Prefs obtained\n"); 
		goto endprog;  
	}
 
PutStr("Gui.c Freeing prefs\n");
	if (g_prefs) FreeVec(&g_prefs); ///+++
PutStr("Gui.c Freed prefs\n"); /// crash
 
 
endprog:
return 1; 
 
}

Sun, 2012-04-15 21:34

salass00

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Last seen: 7 months 1 week ago

Joined: 2011-02-03 11:27

@JosDuchIt It crashes

@JosDuchIt

It crashes because you are taking the address to the variable g_prefs (a pointer to the pointer) and passing it to FreeVec() instead of simply passing the pointer value as returned from AllocVecTags().

Change "FreeVec(&g_prefs);" to "FreeVec(g_prefs);" and it will work.

Mon, 2012-04-16 09:35

(Reply to #2) #3

JosDuchIt

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Last seen: 8 years 1 month ago

Joined: 2012-01-08 20:57

Thanks, I have been confused

Thanks,

I have been confused again with pointers , but here also because the crash pointed to the next line (with addr2line) In my program this was just another FreeVec with same "&" error. I was lead to think the format was OK because no crash pointed to the first FreeVec.

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