Constantly reading a log file from 3rd party application...

[Aktonius]

It baffles me why is everything ok but sometimes all of sudden the file handle becomes unreadable even there is a new data cosntantly added to it, the only solution becomes to close Auto-it process that opened the handle and re-open it again after relaunch.

So the procedure is simple

$xml = FileOpen("c:\path_to_file.xml")

while 1
$data = FileRead($xml)
consolewrite("inspecting data >"&$data&@lf)
wend

But then all of sudden sometimes the handle just becomes undreadable and FileRead() returns blank even it shouldnt(new data is added constantly...)

Any other method i could try to avoid this?

Edited January 26, 2013 by Aktonius

[careca]

Hi, because the file is being used by another aplication, maybe you need to close, and reopen before you read again.

Not sure, just guessing.

[kylomas]

Aktonius,

I would read it like this

while 1
    $xml = FileOpen("c:\path_to_file.xml")
    if $xml = -1 then msgbox($mb_systemmodal,'File Open Error',$xml)
    $data = FileRead($xml)
    consolewrite("inspecting data > " & $data & @lf)
    fileclose($xml)
    $xml = 0
    sleep(1000)
wend

kylomas

[Aktonius]

Closing/opening file handle every second somehow worries me about memory/processor usage or general overkill that might lead to unexpected things but maybe i am just paranoid, thanks for suggestion as thats something i can try.

[kylomas]

Aktonius,

I understand your concern. I think that setting the file handle to "0" releases the resources. However, you could try to serialize the access using "_winapi_fileinuse" in Yashied's WINAPIex UDF (sorry, don't have the link).

kylomas

[kylomas]

Aktonius,

Yashied's UDF is

It might be used like this

#include <winapiex.au3>
$xml = @scriptfullpath
while 1
    if _winapi_fileinuse($xml) = 1 then
  $data = FileRead($xml)
  consolewrite("inspecting data > " & $data & @lf)
 Else
  ConsoleWrite($xml & ' in use' & @LF)
 endif
    sleep(1000)
wend

* - note

The fileread using the filename does an open/close. The more I think about it, the more sense it makes to do an explicit open/close and set the file handle to '0' to free resources. I don't know if the above implicit open/close does this.

kylomas