File Access (Locking / Sharing)

Lemming · Post by **Lemming** » Sat Mar 06, 2004 8:25 pm

Hi there,
is there a way to open a file for input that is already opened for output by another task?
What I'm looking for is an equivalent to
OPEN "BLA" FOR INPUT LOCK SHARED AS #1
as can be used in other Basic dialects...

Thanks already

Lemming · Post by **Lemming** » Sat Mar 06, 2004 10:01 pm

Well,
I've found myself a workaround...

The Fastfile library does the trick, it just opens the file and doesn't care about it being opened for write. Great!

Post by **Dare2** » Sat Mar 06, 2004 10:43 pm

Hiya Lemming, welcome aboard.

Post by **Rings** » Sun Mar 07, 2004 8:17 pm

Lemming wrote:Well,
I've found myself a workaround...
The Fastfile library does the trick, it just opens the file and doesn't care about it being opened for write. Great!

i have studied the api for all the flags while using CreateFile...... hint to fred

Post by **Fred** » Mon Mar 08, 2004 11:29 am

Rings:

LarsG · Post by **LarsG** » Mon Mar 08, 2004 11:38 am

just a quick question:
does FastFile give you any way of knowing that the file is in use?! (ie. not just open it, locked or not..)

Post by **Rings** » Tue Mar 09, 2004 11:30 am

LarsG wrote:just a quick question:
does FastFile give you any way of knowing that the file is in use?! (ie. not just open it, locked or not..)

yes in one way of course
Should i make a Command like IsLocked(Filename)?

LarsG · Post by **LarsG** » Tue Mar 09, 2004 3:03 pm

I've never had any problems working with this myself, but I guess it would be crucial to check if the file is being worked on by another program at the moment you're trying to use it.. what do you think?!?

einander · Post by **einander** » Wed Mar 10, 2004 10:26 am

@Lemming:
May be this helps:
From WinApi documentation, WriteFileEx_() function:

Applications must not read from nor write to the input buffer that a read operation is using until the read operation completes. A premature access to the input buffer may lead to corruption of the data read into that buffer.

You can try the SleepEx_() API function to enter an alertable wait state.

Best regards
Einander

PureBasic Forums - English

File Access (Locking / Sharing)

File Access (Locking / Sharing)

Found a workaround

Re: Found a workaround