RE: [Dev-C++] memory violation....

[Raghunath Marella.S <ms...@ya...>]

Hi Ioannis/Jason/Others,

Please find the piece of code where the memory
violation is seen. I have not deleted the pointer and
accessed after that. No error has been done from my
side. 
 
 
 int *EleTopo=new int[seneles*sennds];
 char *NodeSign=new char[this->NNodes+1];
Similarly few other variables have been dynamically
allocated....
 
 for(int i=0;i<seneles;i++)
   for(int j=0;j<ncn;j++)
   {
     int cuEl = (theSubEle+ise)->SEtopo[i];

     *(EleTopo+i*ncn+j)=(theElement+cuEl-1)->topo[j];
     NodeSign[(theElement+cuEl-1)->topo[j]] =
'P';//All nodes are marked as positive initially.
   }
 After this piece of code, 'EleTopo'  values are
printed and they confirmed to be correct.
   
 After few lines of other code.....  
   
 for(int iel=seneles-1;iel>=0 ; iel--)
 {
	int iLocalForEle=0;
	int curElement = (theSubEle+ise)->SEtopo[iel];
	if(iel==seneles-1)
		coutf << "\n Final element in the SE is...:"<<iel;
//newAdd
	int AnyNode;


	int  noOfDf = 0;
	NoOfNegNodes =0;
	for(int j=0;j<ncn;j++)
	{
	   AnyNode = *(EleTopo+iel*ncn+j);
	   int isThisNodeABN = 0;// is this a boundary node
of SE.
	   for(int it=0;it<SeBNodes;it++)
	   {
	    	if(AnyNode ==
((theSubEle+ise)->SEBounNodes[it]))
		{
			isThisNodeABN = 1;
			break;
		}
		else
		isThisNodeABN = 0;
	   }

	   if(isThisNodeABN==0)
	   {

******	   	if(NodeSign[*(EleTopo+iel*ncn+j)]=='N')
	   	{
			//Do nothing...
	   	}
	   	else
	   	{
			NodeSign[*(EleTopo+iel*ncn+j)]='N';
			int nde = *(EleTopo+iel*ncn+j);
******			*(EleTopo+iel*ncn+j) = -*(EleTopo+iel*ncn+j);
			NoOfNegNodes++;

			//saving the the dfs that are going to be removed
after this element being assembled.
			for(int ir=0;ir<NDF;ir++)
			{
			  *(DfToRemove+iel*(ncn*NDF)+iLocalForEle)=
(nde-1)*NDF+ir;
			  iLocalForEle++;
			}
			  noOfDf+=NDF;
	   	}
	   }
	   else
	      cout <<"\n this Node is a BoundaryNode of
SE...:"<<AnyNode<<".."<<ise;
	}
	noOfDf = iLocalForEle;
	NoNegDf[iel]=NDF*NoOfNegNodes;
 }//sign check ends here.....
 
 
 The problem appears in the line marked with ******.
Actually this problem is seen only in some of the
problems. To give you more idea, I have tested this
code  as standalone, it worked fine for 'EleTopo'
sized upto 3200*6, then it worked  properly and no
memory violation was observed. 
 
 But, when the code used as a server implementation in
CORBA environment, the  so called memory violation
took place when 'EleTopo' was sized to 800*6. Briefly,

 'EleTopo' is like an two dimentional array of size
[800][6]. I have to access  data in 'EleTopo' from the
end, ie., from [800][]. The values are correct till
[48][6] and started giving junk values for some of the
indexes between [47][] to [0][]. 
 
 I have shown in array form just for illustration
purpose. 
 
 I am clueless how this memory violation is taking
place in some cases only. 
 
 Will you pls suggest me what is going wrong in this. 
 
thanks & regards,
Raghunath
 

--- Ioannis Vranos <no...@ho...> wrote:
> > -----Original Message-----
> > From: dev...@li... 
> > [mailto:dev...@li...]
> On Behalf 
> > Of Jason Hardman
> > Sent: Monday, June 10, 2002 1:12 AM
> > To: Dev-C++
> > Subject: Re: [Dev-C++] memory violation....
> > 
> > 
> > You should check that "EleTopo" is non-null before
> using it, 
> > just in case the memory allocation
> > failed. I can't remember if the current MinGW used
> with 
> > Dev-C++ is standards compliant enought to
> > throw an exception when memory allocation fails.
> 
> 
> It is, and no, 0 can not be returned by new.
> 
> 
> Ioannis
> 
> * Ioannis Vranos
> * Programming pages: http://www.noicys.cjb.net
> * Alternative URL: http://run.to/noicys
> 
>
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