DDE Plugins Synchronous Execution?

[tajmone]

Missing info on DDE plugins.

In his Pro Motion DDE Interface in C, Thiadmer Riemersma brings up the issue of wether asynchronous execution of DDE plugins is mandatory or not:

My implementation of a DDE “execute” is asynchronous. I do not know whether Pro Motion requires this. A few other applications for which I implemented DDE conversations required asynchronous execution, so I left it that way. Note that the Delphi implementation also does an asynchronous execution.

• Q: Can DDE plugins be interfaced synchronously too?
• Should I add a clarification footnote to the original document providing the answer for that? (I think Thiadmer won't mind this)

For more info, see also:

• DDE Plugins Synchronous Execution? pmotion-purebasic#3

[jan-cosmigo]

I can't say at the moment, because the DDE transfers are hidden behind an API provided by Delphi. I did not find anything about synchronous or asynchronous data transfer. Whenever the DDE-system receives a message then it calls an event handler. On my side I just write some text into a field and that's it.
Once I find the time to rearrange/redo the code then I might have a closer look at the DDE techniques that are actually used under the hood.