Re: OLE and External Edit

In message <501bf84bdbray@xxxxxxxxxxxxxx>
on 11 Jan 2009 Ray Favre wrote:

In article <gjskbt$rbd$1@xxxxxxxxxxxxxxxxxxx>, John Tytgat
<this@xxxxxxxxxx> wrote:
Ray Favre wrote:
I have text-file copies of the 'official' Acorn OLE spec and OLE
Support spec (both from 1993!). Please let me know separately if
you want them.

Acorn OLE spec ? OLE was specified by CC, no ?

You may well be right. No harm or disrespect intended.

I got it from 'hensa' (I think) and it looked the same as many
Acorn-sourced docs. So I made an assumption.

The only visible credit is that it says it was authored by 'Mike'.

I have this OLE specification, both the original and a version incorporating
helpful comments from Erik Groenhuis.

One question:

In Message_OLE_OpenSession we have in the message block:

+16 = message number (&80E21)
+20 = 16 byte unique name padded with zeros
+36 = window handle of display holding file
+40 = x offset of data in window
+44 = y offset of data in window
+48 = format number
format = 0 or 1 (edit file)
+52 = Session number (24 bit number invented by the client)
+56 = file type
+60 = full pathname of data, zero terminated
format = 2 (redit file)
+52 = Session number (24 bit number invented by the client)
format > 2 (reserved for future expansion)

Can anyone tell me what the values at +36, +40 and +44 are meant to be used
for? Why should the OLE server need to know this information? Do any of
them make use of it?

Also, I note that the session numbers are limited to 24 bits, so I had better
not supply a pointer to the struct associated with my OLE handler, just in
case it is more than 16M into the logical address space of the application
(unlikely, but you never know).

I wonder whether that was a mistake for 32 bit? I'll play safe and ensure I
keep them small.

--
Matthew Phillips
Dundee
.

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