Re: [Rd] Blocking problem with embeded R (windows)

From: Prof Brian Ripley <>
Date: Fri 09 Dec 2005 - 09:27:36 GMT

You are not calling R, but rproxy.dll, part of a (D)COM interface. Try calling R itself (via R.dll).

On Fri, 9 Dec 2005, Simon Knapp wrote:

> Hi all,
> I am trying to make calls to R from an MFC application running on XP
> and am having problems blocking the application while the call
> executes.
> I have tried the following approaches to using R from the application
> (note that I set a wait cursor while R is executing).
> 1) call rcmd in BATCH mode using system(). This works well, except
> that I get the cmd window popping up... which makes the app look
> pretty tacky.
> 2) use the com interface. This works OK... sometimes. When I call
> R_Proxy_evaluate_noreturn by pressing OK in the dialog that starts the
> execution, if the cursor happens to be over the applications window
> when the dialog disappears, then I get my wait cursor and the
> application blocks. If the cursor is not over the applications window,
> then I don't get the wait cursor and the application seems to block
> after the first mouse click within the applications window.
> 3) use Rproxy.dll directly. The application does not block and I don't
> get a wait cursor at all.
> 4) integrate the code used by Rproxy into my application (in
> verbatim). The application does not block and I don't get a wait
> cursor at all.
> The things I have read about DLLs make statements like "a dll is just
> code and data loaded into your applications process", which I have
> taken to imply that the application should block while R is executing.
> This also seems to be implied by the discussion around the rtest
> example r-ext.pdf.
> Can someone offer any advice on whether there is some way to make my
> application block when configuring R? If not, is there a simple way to
> make the app block (I have never coded using threads before, am a
> relative newbie to MFC and am struggling to figure out how I would to
> block otherwise).
> Help would be greatly appreciated,
> Simon Knapp
> ______________________________________________
> mailing list

Brian D. Ripley,        
Professor of Applied Statistics,
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Fri Dec 09 20:33:10 2005

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