> READSAS <- function(sourcefile) .C("readsas", sourcefile)
> OUTPUT <- READSAS("../SASFILES/sdrug.sas7bdat")
> R / C then reads a sas7bdat file and sends the contents to the terminal
> window.
>
> I expected OUTPUT to contain the text that appear in the terminal window
> (i.e., the
> contents of the file). But, that is not the case; OUTPUT contains:
> [[1]]
> [1] "../SASFILES/sdrug.sas7bdat"
READSAS returns the value of .C(...), which returns a list of its arguments,
perhaps modified by the C function you called. Thus you should expect
READSAS to return the filename you gave it (in a list).
Bill Dunlap
TIBCO Software
wdunlap tibco.com
> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
> Behalf
> Of Dennis Fisher
> Sent: Sunday, February 02, 2014 5:10 PM
> To: r-h...@stat.math.ethz.ch
> Subject: [R] Capturing output of a C executable
>
> R 3.0.1
> OS X
>
> Colleagues,
>
> I am experimenting with incorporating C code into R. After compiling the C
> code with:
> R CMD SHLIB -o FILE.so FILE.c
> and executing:
> dyn.load("FILE.so")
> (without any errors), I execute the following R functions in a terminal
> window:
> READSAS <- function(sourcefile) .C("readsas", sourcefile)
> OUTPUT <- READSAS("../SASFILES/sdrug.sas7bdat")
> R / C then reads a sas7bdat file and sends the contents to the terminal
> window.
>
> I expected OUTPUT to contain the text that appear in the terminal window
> (i.e., the
> contents of the file). But, that is not the case; OUTPUT contains:
> [[1]]
> [1] "../SASFILES/sdrug.sas7bdat"
> It is not clear to my how to capture that appears in the terminal window.
>
> Ultimately, I may need to modify the C code so that the output goes to a
> file, which I
> then read into R. However, it would be better if I did not need to modify
> the C code.
> Does anyone have any ideas of how I can capture this output within R?
>
> Dennis
>
> Dennis Fisher MD
> P < (The "P Less Than" Company)
> Phone: 1-866-PLessThan (1-866-753-7784)
> Fax: 1-866-PLessThan (1-866-753-7784)
> www.PLessThan.com
>
> ______________________________________________
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> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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