----- 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
|