Re: [Rd] Using R_MakeExternalPtr

From: Jonathan Zhou <>
Date: Wed, 25 Jul 2007 09:53:36 -0700 (PDT)

Hi all,

Here is the R code function in where I called the two C++ and further below are the 2 C++ functions I used to create the externalptr and use it :

soam.Rapply <- function (x, func, ...,




        njobs <- max(1,ceiling(nrow(x)/batch.size))

    if(!is.matrix(x) && !

        stop("x must be a matrix or data frame")


        {rowSet <- lapply(splitIndices(nrow(x), njobs), function(i) x[i, , drop = FALSE])} else {rowSet <- list(x)}

    sesCon <- .Call("soamInit")

    script <- " "

    fname <- tempfile(pattern = "Rsoam_data", tmpdir = getwd())     file(fname, open="w+")
    if(!is.null(savelist)) {

        dump(savelist, fname)


    for(counter in 1:length(packages))

        temp<-call("library", packages[counter], character.only=TRUE)
        dput(temp, fname)<-readLines(fname)

    for(counter in 1:njobs)

        caller <- paste("caller", counter, sep = "")<-call("dput", call("apply", X=rowSet[[counter]], MARGIN=1,
FUN=func), caller)
        dput(, fname)<-readLines(fname)

        final.script = temp[1]
        for(count in 2:length(temp)){
            final.script<-paste(final.script, temp[count], "\n")}

        .Call("soamSubmit", counter, sesCon, final.script, packages)

    .Call("soamGetResults", sesCon, njobs, join.method, parent.frame())

    for(job in 1:njobs)

        caller <- paste("result", job, sep = "")
        temp = dget(caller)
        if(job==1) {retval=temp} else {retval=join.method(retval,temp)}



extern "C"

SEXP soamInit ()

    // Initialize the API

    // Set up application specific information to be supplied to Symphony     char appName[] = "SampleAppCPP";

    // Set up application authentication information using the default security provider

    DefaultSecurityCallback securityCB("Guest", "Guest");

    // Connect to the specified application     ConnectionPtr conPtr = SoamFactory::connect(appName, &securityCB);

    // Set up session creation attributes     SessionCreationAttributes attributes;


    // Create a synchronous session
    Session* sesPtr = conPtr->createSession(attributes);

    SEXP out = R_MakeExternalPtr((void*)temp, R_NilValue, R_NilValue);

    return out;

extern "C"

  void soamSubmit	(SEXP jobID,		//job ID
			 SEXP sesCon,		//session pointer
			 SEXP caller,			//objects
			 SEXP pack)			//packages

char* savelist = CHAR(STRING_ELT(caller, 0)); string strTemp = ""; int job = INTEGER(jobID)[0]; void* temp = R_ExternalPtrAddr(sesCon); Session* sesPtr = reinterpret_cast<Session*>(temp); // Create a message MyMessage inMsg(job, /*pack,*/ savelist);

    // Send it
    TaskInputHandlePtr input = sesPtr->sendTaskInput(&inMsg); }

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