Error when attempting to call a C++ .dll library in R

Question

I have a library, let's say mylibrary.dll, that has c++ code that I want to run in R. I did this:

dyn.load("mylibrary.dll")
.Call("myfun")

I get:

Error in .Call("myfun") : C symbol name "myfun" not in load table

Now, I've seen several answers to similar problems, on here and on other websites, but when I attempted each solution, each seemed to be to require having access to the original source code, for example adding something like this: extern "C" to the C++ code or re-compiling the code in a certain way. All I have is a .dll file, and I'd like to use that directly to call from R the functions contained within it.

By the way, when I ran the first line of code I got this: `Warning message: In inDL(x, as.logical(local), as.logical(now), ...) : DLL attempted to change FPU control word from 8001f to 9001f`. I saw elsewhere that this can be ignored. — Eric Brooks, Jun 11 '15 at 21:44
Have you tried looking through the load table? On Unix, you would use the `nm` command, but on Windows...I don't know. Maybe try some of the stuff on [this](http://stackoverflow.com/questions/4438900/how-to-view-dll-functions) thread? — Alexey Shiklomanov, Jun 11 '15 at 23:55
Thanks @AlexeyShiklomanov, I was able to figure it out from that thread. — Eric Brooks, Jun 12 '15 at 15:52

score 0 · Accepted Answer · answered Jun 12 '15 at 15:51

Solution: the name of the function was different than what I expected. I went to the thread that Alexey suggested in the comments, and from there was able to use one of the suggested tools (DLL export viewer) to get a list of the functions, where I found the correct name.

(Alas, I now need to figure out why R is locking up when I call the function, but my question here is done!)

Error when attempting to call a C++ .dll library in R

1 Answers1