freeprocess

BlitzMax Forums/BlitzMax Programming/freeprocess

Nigel Brown

(Posted 2007) [#1]

I have tracked a crash down to freeprocess I am calling

text = proc.err.readline$()

from a timer set @ 25Hz. When the crash occurs. This is a total bomb of the program, no errors application just dissapears.

When I slow the timer to 10Hz the crash stops, I will try and produce some example code to go with this soon. but would seem to me that something is overflowing?

klepto2

(Posted 2007) [#2]

Try to check if something is available to read before reading the line.

IF proc.err.readAvail() = true then
   text = proc.err.readline()
endif

H&K	(Posted 2007) [#3]

Running things from timers is bit like using multiTasking (Ok notice ppl I said a BIT like), and you have to be sure that one prossess isnt deleting things that another prossess needs. So as Klepto said just look-see it still exists.
The reason 10 probably works and 25 doesnt is simply down to luck. (Ok simplistic, but hah)

Nigel Brown

(Posted 2007) [#4]

very interesting I just tried IF proc.err.readAvail() and it never returns true but there is text there to read?

Chris C

(Posted 2007) [#5]

you have to check that you close all file handles, you can quickly run out of file handles, I made a post about it somewhere but cant seem to find it now...

klepto2

(Posted 2007) [#6]

Try this:

process:TProcess = CreateProcess("tracert blitzforum.de")

handle:TPipeStream = process.pipe


DebugLog handle.ReadAvail()
DebugLog handle.ReadLine()
While process
   If handle.ReadAvail()
    Local Line:String = handle.ReadLine()
    If Line <> "" Then Print Line
   EndIf
Wend

If you're using MaxGui and you are trying to read the output, then you have to call PollSystem() within the 'while process' loop.

Chris C

(Posted 2007) [#7]

http://www.blitzmax.com/Community/posts.php?topic=67091 see my third post and after if you are creating multiple tprocess objects rather than just using one...

ninjarat

(Posted 2007) [#8]

this is interesting. what exactly do you use this for?