Re: [ctypes-users] finding PID through handle with Ctypes

[Michael C <mys...@gm...>]

I tried this, but it returns zero, is it because I need to initiate the
variable, PID, in DWORD, somehow?

thanks!

> code

import ctypes
import os
import time

User32 = ctypes.WinDLL('User32', use_last_error=True)
Kernel32 = ctypes.WinDLL('Kernel32', use_last_error=True)
window_name = 'Star Wars™: The Old Republic™'
handle = User32.FindWindowW(None, window_name )

print(handle)

PID = 0
print(User32.GetWindowThreadProcessId(handle, PID))
print(PID)










On Mon, Aug 14, 2017 at 10:07 PM, eryk sun <er...@gm...> wrote:

> On Mon, Aug 14, 2017 at 7:57 PM, Michael C
> <mys...@gm...> wrote:
> >
> > I am trying to get the PID of a process given its name. I acquire the
> > handle, and then feed it to the ctypes function hoping it would return
> the
> > PID, but it returns 0!
> >
> > import ctypes
> >
> > window_name = 'chrome.exe'
> > User32 = ctypes.WinDLL('User32', use_last_error=True)
> > Kernel32 = ctypes.WinDLL('Kernel32', use_last_error=True)
> > handle = User32.FindWindowW(None, window_name )
> > print(Kernel32.GetProcessId(handle))
>
> GetProcessId [1] takes a kernel Process handle, but you're passing it
> a user Window handle. Ask the window manager instead. Every Window is
> owned by a Thread, and every Thread belongs to a Process.
> user32.GetWindowThreadProcessId [2] returns both identifiers. The
> second argument to this function is a pointer to a DWORD, to which it
> writes the Process ID.
>
> [1]: https://msdn.microsoft.com/en-us/library/ms683215
> [2]: https://msdn.microsoft.com/en-us/library/ms633522
>