Question

我是python的新手，作为我正在创建的程序的一部分，我正在尝试使用WMI获取所有正在运行的进程及其当前处理器利用率的列表。我也使用线程事件调度程序每隔30秒调用一次。

import wmi
from threading import Timer
import time

c = wmi.WMI()
time_to_sleep  = 30

def get_process_info():
    process_info = {}    
    try:
        for process in c.Win32_Process ():
                id = process.ProcessID
                for p in c.Win32_PerfRawData_PerfProc_Process (IDProcess=id):
                    n1, d1 = long (p.PercentProcessorTime), long (p.Timestamp_Sys100NS)
                    n0, d0 = process_info.get (id, (0, 0))
                    try:
                        percent_processor_time = (float (n1 - n0) / float (d1 - d0)) *100.0
                    except ZeroDivisionError:
                        percent_processor_time = 0.0
                    process_info[id] = (n1, d1)
                    print id, process.Caption, str(percent_processor_time)
    finally: 
        Timer(time_to_sleep, get_process_info, ()).start()
        time.sleep(time_to_sleep) #Sleep while it loops

get_process_info()

第一次运行时，它执行正常，但第二次运行它会引发错误：

Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Python27\lib\threading.py", line 551, in __bootstrap_inner
    self.run()
  File "C:\Python27\lib\threading.py", line 755, in run
    self.function(*self.args, **self.kwargs)
  File "C:\Users\Administrator\workspace\WorkflowTesting\Workflow\Workflow.py", line 32, in get_process_info
    for process in c.Win32_Process ():
  File "C:\Python27\lib\site-packages\wmi.py", line 817, in query
    return self._namespace.query (wql, self, fields)
  File "C:\Python27\lib\site-packages\wmi.py", line 1009, in query
    return [ _wmi_object (obj, instance_of, fields) for obj in self._raw_query(wql) ]
  File "C:\Python27\lib\site-packages\wmi.py", line 1003, in _raw_query
    handle_com_error ()
  File "C:\Python27\lib\site-packages\wmi.py", line 241, in handle_com_error
    raise klass (com_error=err)
x_wmi: <x_wmi: Unexpected COM Error (-2147352567, 'Exception occurred.', (0, u'SWbemServicesEx', None, None, 0, -2147221008), None)>

Answer 1

最好不使用线程来使用以下方法：

import wmi
import time

time_to_sleep  = 30

c = wmi.WMI()
process_info = {}    

while True:
    for process in c.Win32_Process ():
            id = process.ProcessID
            for p in c.Win32_PerfRawData_PerfProc_Process (IDProcess=id):
                n1, d1 = long (p.PercentProcessorTime), long (p.Timestamp_Sys100NS)
                n0, d0 = process_info.get (id, (0, 0))
                try:
                    percent_processor_time = (float (n1 - n0) / float (d1 - d0)) *100.0
                except ZeroDivisionError:
                    percent_processor_time = 0.0
                process_info[id] = (n1, d1)
                print id, process.Caption, str(percent_processor_time)
    time.sleep(time_to_sleep)

我不确定睡眠时间是否有其他影响，但现在它似乎运作良好。我怀疑如果我需要完成其他操作，可以在单独的线程上执行此操作吗？

调用递归函数时WMI意外的COM错误-2147352567

1 个答案: