Allocating Huge Amount of Memory in BCB

[murataykut]

Hi,
I'm writing image processing program on BCB. But, for huge amount of memory allocation BCB doesn't works properly.
I want to allocate nearly 2 GB (total) dynamic arrays. For 1,5 GB there is no problem. But when this size incresing it gives bad allocation error.
In that computer there is 2 GB physical memory and I use WinXP (and I add /3GB to boot.ini).
For testing I wrote an Visual C++ code in another PC which has 1 GB phyisical RAM. In the below code Visual C++ can allocate 1600 MB memory. But this code can allocate only 794 MB on BCB. What can I do? Please help...

  DWORD dwSize = 1024*1024*1600;
  LPVOID pvBase = VirtualAlloc(NULL, dwSize, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
  if (NULL != pvBase)
  {
    //For test only...
    LPBYTE MyPointer = (LPBYTE)pvBase;
    MyPointer[0]=15;
    MyPointer[1]=20;
  }
  else
  {
//    GetLastError
  }
  VirtualFree(pvBase, 0, MEM_DECOMMIT);
  VirtualFree(pvBase, 0, MEM_RELEASE);
 
  pvBase = NULL;
 

[Banfa]

I assume BCB is Borland C++ Builder?

Try allocating your memory in smaller chunks, if necessary create an ADT (abstract data type) that allows you to access the chunks as if they where a single array.

Alternitively 2GB is rather a lot of data to hold in memory, put it in a file, make the file MemoryMapped and again create an ADT to access it as though it where an array.