[Rd] How to get utf8 string using R externals

[xiaoyan yu]

I have a R Script Predict.R:
    set.seed(42)
    C <- seq(1:1000)
    A <- rep(seq(1:200),5)
    E <- (seq(1:1000) * (0.8 + (0.4*runif(50, 0, 1))))
    L <- ifelse(runif(1000)>.5,1,0)
    df <- data.frame(cbind(C, A, E, L))
load("C:/Temp/tree.RData")                #  load the model for scoring

  P <- as.character(predict(tree_model_1,df,type='class'))

Then in a C++ program
I call eval to evaluate the script and then findVar the P variable.
After get each class label from P using string_elt and then
Rf_translateChar, the characters are unicodes (<U+BD80><U+C2E4>) instead of
utf8 encoding of the korean characters 부실.
Can I know how to get UTF8 by using R externals?

I also found the same script giving utf8 characters in RGui but unicode in
Rterm.
I tried to attach a screenshot but got message "The message's content type
was not explicitly allowed"
In RGui, I saw the output 부실, while in Rterm, <U+BD80><U+C2E4>.

Please help.

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