On Mon, 17 Jan 2005 17:44:37 UTC, spam@jqhome.net wrote:

> Hi,
>
> I am working with EAs these days and have framed a couple of questions.
> As part of a system I am writing, I want to allow the user to simply
> retrieve all EAs either as a string, byte array or a linked list of
> these. Part of this might be allowing for backing these up or sending
> them with a file over a network.

You should read carefully what the documentation about EAs have to
say.
For that the best way is to install the toolkt42 coming with your
eComStation.


> If the EA is of type EAT_MVMT or EAT_MVST these can have any custom EA
> saved to them, right?

Yes. But you would onyl create an EA of that type when your specific
logic would need that.

True it is not too easy to design the EAs of an file right - but what
is easy in programming anyway?
You will start finding the right EA type using one of the standard
defined types so long the data you have to store matches them.

I ask since one can list several of these but
> unless the entries are length preceeded there is no way of telling what
> is there.
>
> What is the strategy people use for dealing with unknown EAs? I know
> there are some nifty tools for looking at EAs, but in practice most of
> the time these will be either one of the standard EAs or something
> exotic.

That is the trick to have different EAs with different types. Type and
lengh fields lets you go over EAs you knows nothing about. Defining
you own type can help you to hide some information frm other apps.

> Here is a possible case. Let us say that I have what looks like a
> multivalued EA with n entries. If all of these are
> application-specific, should I just hand back the whole thing as a byte
> array? What I don't want to do is, say, back these up somehow and then
> find they are messed up on the restore.

Follow the definition of the the type! When you does NOT so you will
alive some strange behavior of the system and/or the apps using that
type.

> Any good places to look at examples of how people have worked with EAs?

os2tlkt42.zip. Unzip and install the whole toolkit to find the
examples and extended documentation about EAs.


--
Tschau/Bye
Herbert

Visit http://www.ecomstation.de the home of german eComStation
eComStation 1.2 Deutsch ist da!

Jeff wrote:

> Any good places to look at examples of how people have worked with EAs?

+ my filetype recognition/archivlister program Typ2
+ cmd.exe /c type -ea:FILENAME

But there exist some broken resource compiler versions, that
write corrupted EA. The REXX EA also do not follow the standard
format, but they are an easiely handled special case.

--
Veit Kannegieser

Here is some weirdness I've noticed.

I am able to read EAs with my program. The odd thing is that if I take
a directory and fill in some keywords in the field then try to read, I
get the error from DosQueryPathInfo that the EA list is inconsistent
and there is an EA with no name that is the max of 64k. What gives? I
am going thru the usual dialog in PM and just reading them.
Suggestions??

Jeff

On 17.01.05 18:44, spam@jqhome.net wrote:

> Any good places to look at examples of how people have worked with
> EAs?

Cristian Langanke's WPS Toolkit: http://wpstk.netlabs.org

--
Andreas Schnellbacher

Solution: the chain of EAPO2 structures was not set up correctly.
Grrr. such a friendly API...

-- j