Question

Simple question, I’m writting a program that needs to open huge image files (8kx8k) but I’m a little bit confused on how to initialize the huge arrays to hold the images in c++.

I been trying something like this:

long long SIZE = 8092*8092;     ///8096*8096
double* array;
array = (double*) malloc(sizeof(double) * SIZE);
if (array == NULL)
{
    fprintf(stderr,"Could not allocate that much memory");
}

But sometimes my NULL check does not catch that the array was not initialized, any idea why?

Also I can’t initialize more that 2 or 3 arrays, even when running in a x64 machine with 12 GB of RAM, any idea why?

I would really wish not to have to work with sections of array instead. Any help is welcome.

Thanks.

Answer 1

Are you compiling your application as a 32-bit application (the default in Visual Studio, if that’s what you’re using), or as a 64-bit application? You shouldn’t have troubles if you build it as a 64-bit app.

malloc allocates (reserves memory and returns a pointer), calloc initializes (writes all zeros to that memory).