[Libreoffice-qa] DDE on Windows

Stephan Bergmann sbergman at redhat.com
Tue Jul 30 03:40:14 PDT 2013

On 07/29/2013 03:51 PM, Noel Grandin wrote:
> On 2013-07-29 15:31, Stephan Bergmann wrote:
>> However, I do not know how to trigger that (Windows-specific anyway)
>> code, but I would like to be able to verify that the new code works as
>> intended (whether or not the old code did) before backporting this to
>> libreoffice-4-0 and -4-1.
> Normally, those messages would be used by the Windows context menu stuff
> to run commands for individual files e.g. PRINT and OPEN.
> But it looks like our file associations are configured to simply exec()
> a new copy of LibreOffice.
> Way back in the day DDE was also used as a primitive form of
> Inter-Process Communication, but that has long since been superceded by
> So I'm guessing that this code is pretty dead.

So, any attempt of mine at digging deeper here went back to square one 
(like, you can associate a file extension with a "ddeexec" command in 
the Windows registry, but then need to come up with the syntax for that 
command yourself anyway), so I finally decided to give up and keep the 
code as is for now, with at big fat warning at 
"Add TODO comment expressing doubts about existing code" (and got the 
whole thing backported to libreoffice-4-1 towards 4.1.1).

If anybody wants to pick up from there, that would be most welcome.


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