RE: Determine if a File is Open

1 Apr 2022


      Alan,
Thanks for the response.  I found an API that lists all files open.  If the
pdf is found, I force the user to close it.
Carl
-----Original Message-----
From: ProFox [mailto:profox-bounces@leafe.com] On Behalf Of Alan Bourke
Sent: Tuesday, March 29, 2022 11:45 AM
To: profoxtech@leafe.com
Subject: Re: Determine if a File is Open
Probably the easiest way is just trying to open it and trapping the error.
So assuming you know the file exists then
lnHandle = fopen(lcMyFileName)
if lnHandle = -1   
       * -- The file couldn't be opened so is open somewhere else.
else
        fclose(lnHandle)
endif
To close it you would have to find the file handle from the other process,
i.e. whatever they're using to read PDF files, and use the Windows API to
close that handle. Bearing in mind that they could be using any web browser,
Acrobat Reader or any number of PDF readers to view the PDF. Maybe extract
it in their temp folder and don't worry about erasing it.
-- 
  Alan Bourke
  alanpbourke (at) fastmail (dot) fm

On Tue, 29 Mar 2022, at 4:33 PM, Carl Lindner wrote:
> I extracted "d:\test_dir\test.pdf".  Then used ShellExecute to open it.
The
> user reads the pdf and later I want to erase it.  But, it will not erase
if
> the user has not previously closed it.
>
> 
>
> How can I tell if it is closed?  Even better, is there a way I can close
it?
>
> 
>
> Carl Lindner
>
>
>
> --- StripMime Report -- processed MIME parts ---
> multipart/alternative
>   text/plain (text body -- kept)
>   text/html
> ---
>
[excessive quoting removed by server]

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

RE: Determine if a File is Open