a problem in memory allocation

[jayjay60]

Hi everybody,

I have a strange problem with an allocation of memory for pointers of pointers.

i have done this function to allocate memory for 2 pointers of pointers:

void LoadHistoDB::AllocComptStartEndMin(long RowSize,long ColSize)
{
long i;

pComptStartMineure=new double* [RowSize];
pComptEndMineure=new double* [RowSize];

for(i=0;i<RowSize;i++)
{
pComptStartMineure=new double[ColSize];
pComptEndMineure=new double[ColSize];
}
}

So, after the allocation is done, i want to put value in them, ik that:

pComptStartMineure[j]=i
pComptEndMineure[k]=i

i don't want to post all my code because it will be too long.

So when i test my application with debug method (calling the application with F5!)

When i>120 i could see in the debug window this message in front of pComptStartMineure:

CXX0030:expression cannot be evaluated

and i could see this same message for pComptEndMineure when i>202.

So where is the problem?

Thanks in advance for your help

jayjay

 

[txjump]

i think
pComptStartMineure=new double[ColSize];
pComptEndMineure=new double[ColSize];

should be
pComptStartMineure=new double[ColSize];
pComptEndMineure=new double[ColSize];

 

[tchouch]

void LoadHistoDB::AllocComptStartEndMin(long RowSize,long ColSize)
{
if(RowSize <= 0 || ColSize <= 0) {
//Can't allocate
return;
}
long i;

pComptStartMineure=new double* [RowSize];
pComptEndMineure=new double* [RowSize];
if(pComptStartMineure == NULL || pComptEndMineure == NULL) {
//not enough memory
return;
}
for(i=0;i<RowSize;i++)
{
pComptStartMineure [ i ] =new double[ColSize];
pComptEndMineure [ i ] =new double[ColSize];
}
}
Do You have that too?
void LoadHistoDB::FreeComptStartEndMin(long RowSize)
{
long i;

if(pComptStartMineure == NULL || pComptEndMineure == NULL) {
//nothing allocated
return;
}
for(i=0;i<RowSize;i++)
{
if(pComptStartMineure [ i ])
delete [] pComptStartMineure [ i ];
if( pComptEndMineure [ i ] )
delete [] pComptEndMineure [ i ];
}
if(pComptStartMineure)
delete [] pComptStartMineure;
if(pComptEndMineure)
delete [] pComptEndMineure;
}

 

[jayjay60]

I will try what you suggest to me, but beore doing it, i would like to know how i could solve the problem which break the program if there is not enough memory, because i think it was what happen?

in your post it's this condition:
&quot;
if(pComptStartMineure == NULL || pComptEndMineure == NULL)
{
//not enough memory
return;
}

how could we solve that, because if my application need of X rows and the allocation couldn't be done, it will be very embarrassing!

thanks for your answer

jayjay

 

[tchouch]

Free memory (exit some applications). If You have again not enough memory, add more memory to Your PC - there are no another easy way.
You can swap a part of Your info on disk, but it is not easy, it will works very slowly and I never seen any sample for that.