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Apr 10th, 2007

Access violation in C

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Hi

During writing a code, I need to define dynamic arrays several times, so I wrote the following simple function for defining a double 1D array:

c Syntax (Toggle Plain Text)
/*----------------------------------------------------------------------------
Function for Difining 1-D Dynaimcs Arrays for Storing Double Values 
------------------------------------------------------------------------------*/ 
 
double *allocation_1d_double(int size)
 
{
double *array;
if ( (array = (double *)malloc(size*sizeof(double)) ) == NULL )
 
{
printf("\nError, memory not allocated.\n");
 
exit(1);
}
return array;
}
/*----------------------------------------------------------------------------
Function for Difining 1-D Dynaimcs Arrays for Storing Double Values 
------------------------------------------------------------------------------*/ 
 
double *allocation_1d_double(int size)
 
{
double *array;
if ( (array = (double *)malloc(size*sizeof(double)) ) == NULL )
 
{
printf("\nError, memory not allocated.\n");
 
exit(1);
}
return array;
}

The function works well for more than 20 calling but suddenly it gives the following error:
“Unhandled exception in a.exe: Access Violation"

I checked the code several times and I'm quite sure that error is happened in calling this function. If there was any problem in memory, I expected to receive memory error message but now, I don't know what is wrong with code. Would you please help me?

Last edited by WaltP; Apr 11th, 2007 at 3:19 am. Reason: Added CODE tags -- you actually typed right over what they are when you entered this post...

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ahad

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Apr 10th, 2007

Re: Access violation in C

something is probably corrupting the memory pool some place else in your program and that's a difficult problem to find. If you have a large progrm I would start by commenting out large blocks of code until the problem goes away. That at least narrows down the search.

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Apr 10th, 2007

Re: Access violation in C

Does this occur for specific values of size ? If yes, which compiler are you using ? Also post the relevant code..

Last edited by ~s.o.s~; Apr 10th, 2007 at 12:23 pm.

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Apr 11th, 2007

Re: Access violation in C

Thanks for the guide.

The code is so large and for other size of input data this error is occurred in some other allocation part. so It seems that I have memory problem. My compiler is Visual C++ v.6.0 and my pc has32 bit processor.

I think that I should change the code in the way that I can free some of the arrays after using so that I will have some free memory space for writing rest of the code. What is your idea? Does using 64 bit processor or other compilers have effect? Please advise.

BR,
Ahad

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Re: Access violation in C

>>Does using 64 bit processor or other compilers have effect?

The compiler and processor are not relevent to memory leaks. Offhand I'd say your program has buffer overruns somewhere.

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