通过ctypes获得python windows process的内存使用情况

"""Functions for getting memory usage of Windows processes."""

__all__ = ['get_current_process', 'get_memory_info', 'get_memory_usage']

import ctypes
from ctypes import wintypes

GetCurrentProcess = ctypes.windll.kernel32.GetCurrentProcess
GetCurrentProcess.argtypes = []
GetCurrentProcess.restype = wintypes.HANDLE

SIZE_T = ctypes.c_size_t

class PROCESS_MEMORY_COUNTERS_EX(ctypes.Structure):
_fields_ = [
('cb', wintypes.DWORD),
('PageFaultCount', wintypes.DWORD),
('PeakWorkingSetSize', SIZE_T),
('WorkingSetSize', SIZE_T),
('QuotaPeakPagedPoolUsage', SIZE_T),
('QuotaPagedPoolUsage', SIZE_T),
('QuotaPeakNonPagedPoolUsage', SIZE_T),
('QuotaNonPagedPoolUsage', SIZE_T),
('PagefileUsage', SIZE_T),
('PeakPagefileUsage', SIZE_T),
('PrivateUsage', SIZE_T),
]

GetProcessMemoryInfo = ctypes.windll.psapi.GetProcessMemoryInfo
GetProcessMemoryInfo.argtypes = [
wintypes.HANDLE,
ctypes.POINTER(PROCESS_MEMORY_COUNTERS_EX),
wintypes.DWORD,
]
GetProcessMemoryInfo.restype = wintypes.BOOL

def get_current_process():
"""Return handle to current process."""
return GetCurrentProcess()

def get_memory_info(process=None):
"""Return Win32 process memory counters structure as a dict."""
if process is None:
process = get_current_process()
counters = PROCESS_MEMORY_COUNTERS_EX()
ret = GetProcessMemoryInfo(process, ctypes.byref(counters),
ctypes.sizeof(counters))
if not ret:
raise ctypes.WinError()
info = dict((name, getattr(counters, name))
for name, _ in counters._fields_)
return info

def get_memory_usage(process=None):
"""Return this process's memory usage in bytes."""
info = get_memory_info(process=process)
return info['PrivateUsage']

if __name__ == '__main__':
import pprint
pprint.pprint(get_memory_info())