[Patches] [ python-Patches-977553 ] Speed up EnumKey call
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Wed Jul 14 17:54:48 CEST 2004
Patches item #977553, was opened at 2004-06-22 17:22
Message generated for change (Comment added) made by theller
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Category: Windows
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Garth Bushell (garth42)
Assigned to: Nobody/Anonymous (nobody)
Summary: Speed up EnumKey call
Initial Comment:
This patch removes the RegQueryInfoKey call and
replaces it with a call to EnumKeyEx. This greatly
speeds up this call.
The script below times
python 2.3 5531 89.7130000591
python 2.4 +patch 5531 0.0469999313354
start = time.time()
i = 0
try:
while 1:
_winreg.EnumKey(_winreg.HKEY_CLASSES_ROOT, i)
i += 1
except WindowsError:
pass
print i, time.time() - start
----------------------------------------------------------------------
>Comment By: Thomas Heller (theller)
Date: 2004-07-14 17:54
Message:
Logged In: YES
user_id=11105
I'm curious: Why did you replace RegEnumKey with
RegEnumKeyEx? Are there any advantages of the latter?
----------------------------------------------------------------------
Comment By: Mike Mangino (mmangino)
Date: 2004-07-14 16:12
Message:
Logged In: YES
user_id=74879
This looks good to me, but I think the buffer size is off by
one. I read the SDK to say tha they key can be 255
characters. That means you need to allocate 256 characters
to allow for the null terminator. Could you create a test
case for a max length registry key?
----------------------------------------------------------------------
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