Greetings, Louis-Marie et Pierre!
> I put XV in
> Acedb/bin so that it should be easy for Acedb pick_me_to_call procedure to
> find it. I put the image in the externalFiles directory. but all I get is a
> message in my terminal window saying: Acedb call ...but nothing happens.
>> At this point, I badly need your help:
> Where should i put the binary xv?
> where should i put the pictures (a special directory)?
> What else ?
In ace4_3 there is no magic location for either xv or the image files.
Instead the magic location is the directory wscripts/.
In your ace files, replace "Pick_me_to_call xv my.gif" with
"Pick_me_to_call display my.gif". Then create the following
script named $ACEDB/wscripts/display:
xv $ACEDB/externalFiles/$1 &
(assuming xv is on the users' PATH; if not you can replace "xv" with the
full pathname.) Make the script executable, with "chmod a+x".
This script can be altered to specify a different location
for the image files, or to use a different viewer program instead of xv.
So this indirection via wscripts/ is very flexible and powerful. It's just
too bad that it makes it so hard to guess where the magic is.