Strangeness: Cannot write to a file from a process created by Windows Task Scheduler ...

Sandy Walsh swalsh at impathnetworks.com
Mon Oct 26 18:57:08 CET 2009


Thanks Marco & Al,

Yes it seems to be a flush problem. Strange how it doesn't require the 
explicit flush() when the console window appears, but does otherwise. 
Either way, it gives me a good direction to chase after.

Thanks again for your quick help guys!
-Sandy


Marco Bizzarri wrote:
> You could try to flush the file? Maybe it would flush once you close,
> which never happens; did you try to limit the amount of times it run
> inside the 'while' loop?
>
> Regards
> Marco
>
>
>
> On Mon, Oct 26, 2009 at 6:17 PM, Sandy Walsh <swalsh at impathnetworks.com> wrote:
>   
>> Hi there,
>>
>> Seeing some really weird behavior and perhaps someone has seen something
>> similar:
>>
>> I have a python script that launches as a Windows Scheduled Task. The
>> program simply opens a disk file and writes some text to it:
>>
>> ---
>> f = open("waiting.txt", "w")
>> x = 0
>> while 1:
>>   f.write("Sleeping: %d\r\n" % x)
>>   x += 1
>>   time.sleep(2)
>>
>> f.close()
>> ---
>>
>> I've run it under my user account. I've run it as Local Account. I've run it
>> via pythonw and python ... only one way works:
>>
>> When I run with full credentials (not local account) and python (not
>> pythonw) I get output in the file (and a CMD window appears while it's
>> running). In every other combination it creates the 'waiting.txt' file, but
>> doesn't write any output to the file. The length of the file is 0 bytes.
>>
>> Anyone have ideas what could be causing this? I suspect it's blocking on
>> something, but I can't imagine where.
>>
>> There is no stderr/stdout output anywhere in the program so it's not
>> blocking on anything stdio related (that I can imagine)
>>
>> Thoughts?
>> -Sandy
>>
>>
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>>     
>
>
>
>   

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