[Rd] R API for C/C++ initialisation issue appears with update to R.3.5

[luke-tier@ey m@ili@g off uiow@@edu]

You might have more luck getting help with a completely self-contained
example (no QT in particular) and a complete description of how you
built and ran your example.

That said, the placement of the call to Rf_endEmbedded looks a little
odd.

Best,

luke

On Thu, 12 Jul 2018, Andéol Evain wrote:

> Hello everyone,
>
> I have a C++ program that calls R using R_tryEval, very similarly to what
> package RInside does.
> It used to work with R.3.4.3 and R.3.4.4. However, since I updated it to
> R.3.5.1, R sends an error message: "*Error in < My command > : the base
> graphics system is not registered*"  for any command related to the
> graphics package.
>
> I made a ticket on stackoverflow about it: https://stackoverflow.com/
> questions/51242993/difference-between-r-3-4-4-and-r-3-5-1-in-r-api-for-c
>
> But nobody could explain why so far. And after reducing my code further, I
> am now enclined to think this is actually a bug.
>
> The code provided in stackOverflow is already reduced, but not minimal yet.
> Since then, I reduced it further to really ensure that it was not an
> interference from anything around it. So I removed the GUI and the
> callbacks.
> Here is a really minimal example attached.
>
> In its current form, the program just sends the command :   par("mar") to
> R, and then the command  dev.off()   .
> With R.3.4.4, this program print as output what is expected. No error
> occured during evaluation of the command :
>
>
>
>
>
>
>
>
>
> *No error occured during eval of "par(\"mar\")"EXAMPLE #1 Output: EXAMPLE
> #1 Output: Result is:  "5.1"Result is:  "5.1"Result is:  "5.1"Result is:
> "5.1"No error occured during eval of "dev.off()"Result is:  "1"*
>
> But the exact same program with R.3.5.1 gives:
>
>
>
>
>
> *An error occured during eval of "par(\"mar\")"No error occured during eval
> of "dev.off()"Result is:  "1"*
>
> The error that occured is not displayed here, since I removed the callbacks
> to fetch it, but it was:
> *Error in par("mar") : the base graphics system is not registered*
>
>
> I compiled Microsoft Visual C++ Compiler 15.0 (amd64), and uses 64bits
> version of R. But previously I also observed the same behovior with 32bits.
> I also tried re-installing R from scratch, without effect.
>
> I am using Windows 10, 64bits
> Registry variables PATH and R_HOME are correctly set and points to the
> appropriate version of R, installed in the default directory.
>
> I'd be glad to hear any ideas about potential fixes or workaround.
>
> Cheers,
>
> Andéol Evain
>

-- 
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
Department of Statistics and        Fax:               319-335-3017
    Actuarial Science
241 Schaeffer Hall                  email:   luke-tierney using uiowa.edu
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