获取前台窗口的进程ID
我正在尝试在Python中构建时间跟踪器，以记录我正在使用的应用程序的屏幕时间。 我用来使前景窗口的PID的方法大部分时间都很好：
import psutil
import win32gui
import win32process
while True:
try:
time.sleep(0.5)
pid1 = win32process.GetWindowThreadProcessId(win32gui.GetForegroundWindow())
process1 = psutil.Process(pid1[-1]).name()
time.sleep(0.5)
pid2 = win32process.GetWindowThreadProcessId(win32gui.GetForegroundWindow())
process2 = psutil.Process(pid2[-1]).name()
if process1 != process2:
print(process2)
except ValueError or psutil.NoSuchProcess or ProcessLookupError as error:
print(error)
但是有时 getwindowthreadProcessid （第7行）返回一个奇怪的pid，有时为负：
pid must be a positive integer (got -571069920)
pid must be a positive integer (got -571069920)
pid must be a positive integer (got -571069920)
pid must be a positive integer (got -571069920)
pid must be a positive integer (got -571069920)
...而在我的情况下，在我的系统上约为18000。
它发生随机发生，主要是在使用Chrome时，如果我关闭并重新打开窗口，则PID再次正常，并且我可以正常获得该过程名称。
有人知道为什么会发生或推荐另一种方法吗？
我尝试重新安装库。
I'm trying to build a time tracker in Python, that records the screen time of applications I'm using.
Approach that I use to get the PID of foreground window works fine most of the time:
import psutil
import win32gui
import win32process
while True:
try:
time.sleep(0.5)
pid1 = win32process.GetWindowThreadProcessId(win32gui.GetForegroundWindow())
process1 = psutil.Process(pid1[-1]).name()
time.sleep(0.5)
pid2 = win32process.GetWindowThreadProcessId(win32gui.GetForegroundWindow())
process2 = psutil.Process(pid2[-1]).name()
if process1 != process2:
print(process2)
except ValueError or psutil.NoSuchProcess or ProcessLookupError as error:
print(error)
But sometimes GetWindowThreadProcessId (line 7) returns a weird PID, sometimes negative:
pid must be a positive integer (got -571069920)
pid must be a positive integer (got -571069920)
pid must be a positive integer (got -571069920)
pid must be a positive integer (got -571069920)
pid must be a positive integer (got -571069920)
...while in my case the largest PID on my system was around 18000.
It happens randomly, mostly when using Chrome, if I close and reopen the window, it's PID is normal again, and I can get it's process name normally.
Does someone know why it is happening or recommend an alternative approach?
I tried reinstalling the libraries.
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找到了问题。
有时
getForegroundWindow认为前景窗口是系统空闲过程，然后getWindowThreadProcessID返回与该过程相对应的PID的列表 - [0（始终有效），{一些大的数量}（始终无效）]，而其他过程的第一个PID始终无效（这就是为什么要获得正确的PID，我使用pid [-1]）Found the problem.
Sometimes
GetForegroundWindowthinks that the foreground window is System Idle Process, thenGetWindowThreadProcessIdreturns a list of to PIDs corresponding to that process - [0 (always valid), {some big number} (always invalid)], while the other processes have the first PID always invalid (this is why to get the correct PID I usepid[-1])