Python script to get the RAM and available hard disk memory

Python uses ctypes module to abstract the hardware information. ctypes allows to call functions in dlls/shared libraries and has extensive facilities to create, access and manipulate simple and complicated C data types in Python - in other words: wrap libraries in pure Python. It is even possible to implement C callback functions in pure Python.

ctypes works on Windows, Windows CE, Mac OS X, Linux, Solaris, FreeBSD, OpenBSD


import ctypes
import platform
import os

class SysInfo:

    def __init__(self):

        self.totalRam, self.availRam = self.ram()
        self.totalRam = self.totalRam / (1048576)
        self.availRam = self.availRam / (1048576)



    def ram(self):
    try:
        kernel32 = ctypes.windll.kernel32
        c_ulong = ctypes.c_ulong
        class MEMORYSTATUS(ctypes.Structure):
            _fields_ = [
                ('dwLength', c_ulong),
                ('dwMemoryLoad', c_ulong),
                ('dwTotalPhys', c_ulong),
                ('dwAvailPhys', c_ulong),
                ('dwTotalPageFile', c_ulong),
                ('dwAvailPageFile', c_ulong),
                ('dwTotalVirtual', c_ulong),
                ('dwAvailVirtual', c_ulong)
            ]

        memoryStatus = MEMORYSTATUS()
        memoryStatus.dwLength = ctypes.sizeof(MEMORYSTATUS)
        kernel32.GlobalMemoryStatus(ctypes.byref(memoryStatus))
        return (memoryStatus.dwTotalPhys, memoryStatus.dwAvailPhys)
    except , err;
        print "No ram found"



    def get_free_space(self,folder, format="GB"):
        """
            Return folder/drive free space
        """
    try:
        fConstants = {"GB": 1073741824,
                      "MB": 1048576,
                      "KB": 1024,
                      "B": 1
                      }
        if platform.system() == 'Windows':
            free_bytes = ctypes.c_ulonglong(0)
            ctypes.windll.kernel32.GetDiskFreeSpaceExW(ctypes.c_wchar_p(folder), None, None, ctypes.pointer(free_bytes))
            #return (int(free_bytes.value/fConstants[format.upper()]), format)
            return (int(free_bytes.value/1073741824), format)
        else:
            return (int(os.statvfs(folder).f_bfree*os.statvfs(folder).f_bsize/fConstants[format.upper()]), format)
    except , err;
        print "No hard disk found"
       
if __name__ == "__main__":
        sys = SysInfo()
        print "System Memory : %dMb total" % sys.totalRam
        print "Available System Memory  : %dMb free" % sys.availRam
        byteformat = "GB"
        drive = raw_input("Enter drive:")
        space,size =  sys.get_free_space(drive+":", byteformat)
        print space,size