How to get Windows physical RAM using python?

[Bengt Richter]

On Wed, 30 Jul 2003 23:04:56 +0200, =?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?= <martin at v.loewis.de> wrote:

>Mark wrote:
>
>> OK, How to check the amount of Windows physical RAM using python?
>
>You should call the GlobalMemoryStatus(Ex) function. To my knowledge,
>there is no Python wrapper for it, yet, so you would need to write one.
>
>Regards,
>Martin
>
====< memorystatus.c >=============================================
/*
** memorystatus.c
** Version 0.01 20030731 10:45:12 Bengt Richter bokr at oz.net
**
*/

#include "Python.h"
#include <windows.h>

static char doc_memstat[] =
    "Returns list of 7 integers:\n"
    "   [0]: percent of memory in use\n"
    "   [1]: bytes of physical memory\n"
    "   [2]: free physical memory bytes\n"
    "   [3]: bytes of paging file\n"
    "   [4]: free bytes of paging file\n"
    "   [5]: user bytes of address space\n"
    "   [6]: free user bytes\n";

static PyObject *
memorystatus_memstat(PyObject *self, PyObject *args)
{
    PyObject *rv;
    MEMORYSTATUS ms;
    GlobalMemoryStatus( &ms );

    if (!PyArg_ParseTuple(args, "")) /* No arguments */
        return NULL;
    rv = Py_BuildValue("[i,i,i,i,i,i,i]",
        ms.dwMemoryLoad,    // percent of memory in use 
        ms.dwTotalPhys,     // bytes of physical memory 
        ms.dwAvailPhys,     // free physical memory bytes 
        ms.dwTotalPageFile, // bytes of paging file 
        ms.dwAvailPageFile, // free bytes of paging file 
        ms.dwTotalVirtual,  // user bytes of address space 
        ms.dwAvailVirtual   // free user bytes 
    ); 
    return rv;
}

/* List of functions defined in the module */
static struct PyMethodDef memorystatus_module_methods[] = {
    {"memstat", memorystatus_memstat, METH_VARARGS, doc_memstat},
    {NULL, NULL}                 /* sentinel */
};


/* Initialization function for the module (*must* be called initmemorystatus) */
static char doc_memorystatus[] = "Get win32 memory status numbers (see memstat method)";

DL_EXPORT(void)
initmemorystatus(void)
{
    PyObject *m, *d, *x;

    /* Create the module and add the functions */
    m = Py_InitModule("memorystatus", memorystatus_module_methods);
    d = PyModule_GetDict(m);
    x = PyString_FromString(doc_memorystatus);
    PyDict_SetItemString(d, "__doc__", x);
    Py_XDECREF(x);
}
===================================================================

You may find a little .cmd file like this (tailored to your system) handy:

[10:55] C:\pywk\ut\memorystatus>type \util\mkpydll.cmd
@cl -LD -nologo -Id:\python22\include %1.c -link -LIBPATH:D:\python22\libs -export:init%1

[10:56] C:\pywk\ut\memorystatus>mkpydll memorystatus
memorystatus.c
   Creating library memorystatus.lib and object memorystatus.exp

[10:56] C:\pywk\ut\memorystatus>python

(I'll indent this one space to avoid spurious quote highlights)

 Python 2.2.2 (#37, Oct 14 2002, 17:02:34) [MSC 32 bit (Intel)] on win32
 Type "help", "copyright", "credits" or "license" for more information.
 >>> import memorystatus
 >>> help(memorystatus)
 Help on module memorystatus:

 NAME
     memorystatus - Get win32 memory status numbers (see memstat method)

 FILE
     c:\pywk\ut\memorystatus\memorystatus.dll

 FUNCTIONS
     memstat(...)
         Returns list of 7 integers:
         [0]: percent of memory in use
         [1]: bytes of physical memory
         [2]: free physical memory bytes
         [3]: bytes of paging file
         [4]: free bytes of paging file
         [5]: user bytes of address space
         [6]: free user bytes

 DATA
     __file__ = 'memorystatus.dll'
     __name__ = 'memorystatus'


 >>> memorystatus.memstat()
 [0, 334929920, 271536128, 942825472, 861339648, 2147352576, 2129780736]

Warning: Just now did this. Not tested beyond what you see!!

Regards,
Bengt Richter