On 12/06/2007, at 8:01 AM, Michael Foord wrote:
> I recently blogged about how listing all running processes is easy
> with
> IronPython [1].
>
> This contrasts with the pywin32 solution we were using which is a
> 'touch' more obscure (!) and has recently started failing on one
> machine. However, I'm pretty certain that the pywin32 code we are
> listing is 'sub-optimal'.
>
> Can anyone suggest a better solution?
If by better you mean clearer to read, then the wmi module (as Tim
suggested) is probably the best. If by better you mean faster, I
find that using the Process32First/Process32Next methods via ctypes
the fastest. Here, it takes about 6 seconds to get a complete list
with win32pdh, about 3 seconds with wmi, about 0.25 seconds with wmi-
via-win32com, and about 0.015 seconds with ctypes. The only
differences in the returned results are that win32pdh returns a
"_Total" 'process', and calls idle "Idle", WMI (either way) calls
idle "System Idle Process", and the ctypes method calls it "[System
Process]". While the ctypes method is fast, it's not particularly
clear, however :)
import ctypes
import win32con
TH32CS_SNAPPROCESS = 0x00000002
class PROCESSENTRY32(ctypes.Structure):
_fields_ = [("dwSize", ctypes.c_ulong),
("cntUsage", ctypes.c_ulong),
("th32ProcessID", ctypes.c_ulong),
("th32DefaultHeapID", ctypes.c_ulong),
("th32ModuleID", ctypes.c_ulong),
("cntThreads", ctypes.c_ulong),
("th32ParentProcessID", ctypes.c_ulong),
("pcPriClassBase", ctypes.c_ulong),
("dwFlags", ctypes.c_ulong),
("szExeFile", ctypes.c_char * 260)]
def process_list():
# See http://msdn2.microsoft.com/en-us/library/ms686701.aspx
CreateToolhelp32Snapshot = ctypes.windll.kernel32.\
CreateToolhelp32Snapshot
Process32First = ctypes.windll.kernel32.Process32First
Process32Next = ctypes.windll.kernel32.Process32Next
CloseHandle = ctypes.windll.kernel32.CloseHandle
hProcessSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0)
pe32 = PROCESSENTRY32()
pe32.dwSize = ctypes.sizeof(PROCESSENTRY32)
if Process32First(hProcessSnap,
ctypes.byref(pe32)) == win32con.FALSE:
print >> sys.stderr, "Failed getting first process."
return
while True:
yield pe32.szExeFile
if Process32Next(hProcessSnap,
ctypes.byref(pe32)) == win32con.FALSE:
break
CloseHandle(hProcessSnap)
Cheers,
Tony
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