Determining memory size in C?

aska · #1 01-Jun-2009, 09:19

i have a little code for determing memory size this my code:

CPP / C++ / C Code:


/*   using interupt 12H  BIOS)              */
#include<stdio.h>
#include<bios.h>
int main(void)
 {
  printf("memory size %d kbite\n", biosmemory());
  return 0;
 }

by compiling i have error:Cannot open include file: 'bios.h': No such file or directory..so where i can find thi file if needed or how i can solve it by another way?

nordtorp · #2 01-Jun-2009, 10:29

Hello aska,

I just Googled around and came across your thread. The biosmemory is only compatible with DOS and Windows 3.x.

Look at this page for more information: http://www.digitalmars.com/rtl/bios.html#_bios_memsize

As for any solution for your problem, I don't really know.

What memory are you going to read? System memory (RAM) or some cache of some sort?

aska · #3 01-Jun-2009, 11:00

I'm going to read system memory (RAM).

davekw7x · #4 01-Jun-2009, 14:55

Quote:

Originally Posted by aska

I'm going to read system memory (RAM).

Do you mean to read the amount of physical memory present in your system?

There are no standard C or C++ library functions that deal with hardware considerations (ram, video display, etc.)

There may be operating-system dependent functions available with your compiler.

For example, on my Windows xp platform with Microsoft and Borland compilers I can use the following, based on an example from msdn:

CPP / C++ / C Code:

/*  
    From the example at
        [url]http://msdn.microsoft.com/en-us/library/aa366589.aspx[/url]

    davekw7x

*/

#include <windows.h>
#include <stdio.h>

int main()
{
    MEMORYSTATUSEX statex;

    statex.dwLength = sizeof (statex);
    GlobalMemoryStatusEx (&statex);

    printf("Memory size = %7I64d Bytes\n", statex.ullTotalPhys/1024);
    return 0;
}

If your workstation has one GByte of memory installed, you can expect to see something like:

Code:

Memory size = 1048048 kBytes

If you are running Linux, you can get the information from /proc/meminfo.

With my various Linux workstations, I can just open /proc/meminfo as a file and read a line at a time into a buffer until I see the line that begins with "MemTotal:"

Then I use sscanf to read the second item into an unsigned long variable.

Regards,

Dave

Footnote: The "/proc/meminfo" stuff also works for me with GNU gcc on my Windows/Cygwin workstation.

If you have some compiler other than GNU or a fairly recent Microsoft or Borland compiler or if you are using some other operating system there may be (or, maybe not) similar (or dissimilar) functions. In other words, any time you need non-standard functions for your task: YMMV (Your Mileage May Vary).

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Determining memory size in C?

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