On exclusive open for write

I have identified the relevant threads and have read the pages in the
microsoft support website. Experts, please share with me:

>From reading the code I understand that the procedure is not
full-proof.

A function IsFileOpen attempts to open a file for I/O. It then closes
it and returns TRUE if an error was produced while attempting to open.

Then, the attempt to open at Excel-level is done through invocation of
IsFileOpen in an IF.

In other words, broadly speaking, we have the following sequence of
events:

Open at I/O level.
Close at I/O level.
Workbook.Open

Thus, it is possible that between the Close and Workbook.Open someone
else has opened the file. Am I correct? Am I missing something?

Is there a full-proof way to open a file exclusively for write and then
use object libraries with it?

Regards,
Kostis Vezerides

Why don't you just try to open the file: if you can open it then why close
it again?
Just open it and keep it open, or raise an error if the file can't be
opened.

Tim

--
Tim Williams
Palo Alto, CA


"vezerid" <vezerid@act.edu> wrote in message
news:1137699672.852884.235130@g44g2000cwa.googlegroups.com...
> I have identified the relevant threads and have read the pages in the
> microsoft support website. Experts, please share with me:
>
> >From reading the code I understand that the procedure is not
> full-proof.
>
> A function IsFileOpen attempts to open a file for I/O. It then closes
> it and returns TRUE if an error was produced while attempting to open.
>
> Then, the attempt to open at Excel-level is done through invocation of
> IsFileOpen in an IF.
>
> In other words, broadly speaking, we have the following sequence of
> events:
>
> Open at I/O level.
> Close at I/O level.
> Workbook.Open
>
> Thus, it is possible that between the Close and Workbook.Open someone
> else has opened the file. Am I correct? Am I missing something?
>
> Is there a full-proof way to open a file exclusively for write and then
> use object libraries with it?
>
> Regards,
> Kostis Vezerides
>

It is because I want the file to work for multi-user access. The idea
is that SPR1.xls is used as a template for data entry by many users. By
clicking a button I want the elements of the form to be stored in a
central table, in SPR2.xls, located in the network. Therefore locking
issues are important.

Kostis

That still doesn't explain why, if you want to write data to the file, you
don't just try to open it and then keep it open if you succeed.
I don't get why you open it and then immediately close it (only to open it
again later).

--
Tim Williams
Palo Alto, CA


"vezerid" <vezerid@act.edu> wrote in message
news:1137762495.612834.271940@g14g2000cwa.googlegroups.com...
> It is because I want the file to work for multi-user access. The idea
> is that SPR1.xls is used as a template for data entry by many users. By
> clicking a button I want the elements of the form to be stored in a
> central table, in SPR2.xls, located in the network. Therefore locking
> issues are important.
>
> Kostis
>