[R] R-Embedding and error messages

[Martin Morgan]

Hi Jorge --

I hesitate to suggest this unsupported solution (as these public
suggestions tend to mean that the solution disappears!), but in C

extern void R_SetErrorHook(void (*)(SEXP, char *));

void
my_ErrorHook(SEXP call, char *message)
{

   /*
        etc; e.g., cache message, perhaps reset error hook (hook is
        removed after error; nested R-level try() may mean multiple
        errors per R_tryEval?
   */

}

and then

...

    R_SetErrorHook( my_ErrorHook );
    PROTECT(value = R_tryEval( expr, env, errorOccurred ));
    if( *errorOccurred ) {
        /* etc, e.g., retrieve error message(s) from cache */
    }
    /*
        hmm, maybe R_SetErrorHook needs to be cleared here, or at
        least replaced with a no-op?
    */
...

This is an R-devel question, not R-help.

Martin

"Jorge W. Cardoso" <cardoso at montevideo.com.uy> writes:

> I'm writing a C++ application using R-embedding to do some
> forecast process.
>
> I also use R_tryEval instead of R_Eval to run my R-script,
> so that in case of error I know exactly in which line number
> was the last error.
>
> In particular, from time in time y get some error messages
> refering an exceptional condition in the arima model.
>
> I want to catch these error messages from de C code 
> (or at least the code error number) to take some 
> corrective actions.
>
> Is there any way to do that ?
>
> Regards,
>
> Jorge W. Cardoso
>
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-- 
Martin Morgan
Computational Biology / Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N.
PO Box 19024 Seattle, WA 98109

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