Jump to content
Sign in to follow this  

_TempFile UDF - possible bug

Recommended Posts


Hello I have noticed a very strange behavior of this function - it seems to be outputting the SAME result when you run two concurrent scripts and they happen to call this function in the same time!

It took me a while to see what's happening but it is true - my two scripts both log messages in one logfile while running so I set up logging of the generated _TempFile filename they were going to use and it was the same several times. It seems it does not depend on system time seconds value, because I generated 5 filenames during one second and 2 pairs were the same and one was different. What shall I do? I think I will have to use some fixed filename for every file operation instead of _TempFile since it is not reliable when you run two processes using it :-\

Share this post

Link to post
Share on other sites

Try to use GetTempFileName :D

*GERMAN* [note: you are not allowed to remove author / modified info from my UDFs]My UDFs:[_SetImageBinaryToCtrl] [_TaskDialog] [AutoItObject] [Animated GIF (GDI+)] [ClipPut for Image] [FreeImage] [GDI32 UDFs] [GDIPlus Progressbar] [Hotkey-Selector] [Multiline Inputbox] [MySQL without ODBC] [RichEdit UDFs] [SpeechAPI Example] [WinHTTP]UDFs included in AutoIt: FTP_Ex (as FTPEx), _WinAPI_SetLayeredWindowAttributes

Share this post

Link to post
Share on other sites

Use the PID as prefix, like:

$tempfn = _TempFile(@TempDir, @AutoitPID)

It should work around. You should perhaps try to make a reproduce example script. After confirmation post a ticket asking that the function be changed to incorporate the PID within the filename before testing for existence.

Anyway, that should bring our attention to the fact that the source of entropy used inside Random in not good enough and not resistant to parallel use in distinct processes. Perhaps using PID and some memory base address of process or similar value would help having a more random Random. I believe the underlying function itself is well beyond doubt; the culprit must be the seed used and the unsufficiently small granularity of timer(s).

This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this