Message-ID: <op.vdzc8dx6yqqyib@amazonas.geoecology.uni-potsdam.de>
Date: 2010-06-08T12:06:03Z
From: Melwin
Subject: file closing timing problem
In-Reply-To: <8AFB4A1479ECD246A26FAA98CC48A93C018FE2A1@granite1604>
I am not sure if this belongs on this list, anyway:
Wait until somefile.dat (i.e. a file that is supposed to be modified by
swat_edit.exe) has been renewed:
while ( difftime(Sys.time(),file.info("somefile.dat")$atime,units="sec") >
30 )
Sys.sleep(1)
#to be placed between your two system calls
cheers,
Melwin
Am 08.06.2010, 13:38 Uhr, schrieb John Joseph <John.Joseph at utsa.edu>:
> Hello,
> I hope someone can help me with what seems like a simple problem. I
> have the following code:
> system("swat_edit.exe", wait=FALSE, invisible=FALSE)
> system("swat2005.exe")
> In the first line, swat_edit.exe edits hundreds of input files, which
> are then to be used by swat2005.exe in its calculations. The problem is
> that before swat_edit.exe finishes editing and closing all the input
> files, swat2005.exe begins, and an error occurs that such-and-such an
> input file is already in use so that swat2005.exe cannot run.
> Naturally, one would think that changing wait=FALSE ot wait=TRUE might
> solve the problem. But wait = TRUE gives an error.
> I am using Windows 7 and Windows XP, and this problem occurs with both.
> I've inserted a time-delaying statement, z<- mean(runif(30000000,0,1),
> to buy time, but this only helps on the older computer I have, not on
> the new Core i7, which I really want to make use of. The suggestion has
> been made to switch to a Linux system, but I'm having trouble getting
> the source code for swat_edit.exe so that I can recompile for Linux.
> Any ideas, if I want to try to achieve this in Windows?
> Your help would be much appreciated.
> John Joseph
>
> [[alternative HTML version deleted]]
>
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