----- Original Message -----
Sent: Thursday, October 30, 2008
7:33 AM
Subject: Re: [amibroker] How to
fclose()/fdelete() left open files from afl
Herman,
Best method to avoid problems,
interdependenices is to
open file, do the reading/writing you need
and close the file all within ONE funciton.
Don't worry too much about the open/close
performance as system caches file access and you are not
really accesing disk file physically, but
its file system virtual cache in RAM.
Do not keep files open between functions,
all file operation should be encapsulated in one function
that does the job.
You should keep dependencies between
functions at lowest possible level (ideal: zero).
Funcitons should only communicate via one
entry point (input parameters) and one defined result.
Best regards,
Tomasz
Janeczko
amibroker.com
----- Original Message -----
Sent: Thursday, October 30, 2008
3:19 PM
Subject: Re: [amibroker] How to
fclose()/fdelete() left open files from afl
I am now using this, somewhat awkward, method to monitor file
open/close operations. I wrapped fopen() with xfopen() and fclose()
with xclose().
I post this just in case someone has similar debugging
problems.
Herman
function Trace( Msg )
{
TraceEnabled = Nz( StaticVarGet( "TraceEnabled" )
);
if ( TraceEnabled
) _TRACE( Msg );
}
function TRACEONCE( Msg )
{
TraceEnabled = Nz( StaticVarGet( "TraceEnabled" )
);
if ( TraceEnabled
)
{
PrevMessage = StaticVarGetText(
"LastTraceMsg" );
if (
PrevMessage != Msg )
{
_TRACE( Msg );
StaticVarSetText(
"LastTraceMsg", Msg );
}
}
}
function xfopen( filename, mode )
{
fh = fopen( filename, mode );
StaticVarSetText("FM"+fh, filename + " Mode: "+Mode
);
TraceOnce("FILE Opened: "+ filename+ " Mode:
"+Mode);
return fh;
}
function xfclose( Handle )
{
fclose( Handle );
FileMode = StaticVarGetText("FM"+Handle );
TraceOnce("FILE Closed: "+ FileMode );
}
Thursday, October 30, 2008, 8:46:25 AM, you wrote:
|
> |
It often happens during development that,
due to coding errors, files are not closed. The only way to
close these file appears to be to use an external UnLock program
to UnLock and delete the file. Since I use many files it is very
time consuming to locate the open files and the afl errors that
caused them.
I'd like advice from experienced
programmers on how to detect, locate, and close files left open
due to mistakes, from afl of course.
many thanks for any suggestions you may
have,
herman
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