PureBasic Forums - English

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

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!

Hiya Lemming, welcome aboard.

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

Rings:

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..)

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)?

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?!?

@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