Hello to you My CAD forum,
I'm looking to interconnect Catia and Visual studio because I found a program called graphy that does vector on Catia: GitHub - Wertoi/Graphy: Catia 3D writer. Only although the interface launches, the connection between this program and Catia is not made! Do you know of a dll in Catia (dassaultsystem/code/bin...) that can do this interconnection or another way without retouching the graphy code if possible 
Hello
Have you looked at this link:
Otherwise here is a remark even if no Catia for me the problem may be identical.
On Solidworks you need to have the corresponding version of visual studio for SW2020 → Visual studio 2015. And if you take a newer version, it doesn't work.
See also this topic:
And also:
And finally:
Hello @sbadenis and thank you for your answer.
The first video is not very appropriate for my problem, but I take it because it shows COM references to add when connecting catia visual studio, but I don't think it solves the interconnection problem.
After I even converted the code into .exe, but the connection still doesn't happen.
It could be that this is a problem with the version of Catia not recognized by this code but the code should be readapted and the .... I'm dry!! 
for now but I'm continuing on my own.
CDLT
Rémi
I was also talking about the version of visual studio which must imperatively correspond to the version of Catia under solidworks.
On the other hand, I couldn't find the page that gives the version of visual studio to use with this or that version of Catia.
And good luck for the rest of your research.
@sbadenis ,
It was a CATIA version problem, the versions above the R28 are not recognized by Graphy:
