Using R(D)COM for integrating R with C#

Question

I am trying to use R(D)Com interface. I have R 2.12.1 installed on machine. For using this interface in C#, I loaded rscproxy_1.3-1 package and then installed R_Scilab_DCOM3.0-1B5 on my machine. Also, I copied sciproxy.dll from Program Files\R(D)COM Server\Scilab to Program Files\R(D)COM Server\bin, as informed while installing the interface.

My Problem:

As a part of testing, I tried the code from blog post http://vvella.blogspot.com/2010/08/integrate-c-net-and-r-taking-best-of.html. But my form application failed due to exception raised by statement rconn.Init(“R”). The exception text was Exception from HRESULT: 0x80040013 I tried to run samples from Programs->R->R(D)COM Server->Server 01 Basic Test. On launched form, I clicked button “Start R” but it failed with error printed in text box as “Initializing R...Function call failed Code: -2147221485 Text: installation problem: unable to load connector”

I tried this:

I tried to troubleshoot it with the help of Index html page, and there under installation section, I found that there must be rproxy.dll under installed R/Bin folder. Also, HKEY_LOCAL_MACHINE\Software\R-core\R\InstallPath should point to installation folder.

Things lacking on my machine are

the installed R/bin folder doesn’t contain rproxy.dll. Where can I get this dll? Or is it sciproxy.dll instead?
HKEY_LOCAL_MACHINE\Software\R-core\R\InstallPath points to installation folder, but there is no entry under HKEY_CURRENT_USER\Software.

I can guess there is something fishy about installation, or registering COM server. But I am not successful in figuring it out.

Could you please tell me where am I going wrong?

thanks,

Kapil

Start with something simpler than a form - try a console app to begin with and put mrnye's code into Main. — Richie Cotton
– Richie Cotton, Commented Feb 22, 2011 at 12:59
Also, I remember that there was a bug in the old versions that meant rcom had to be installed in the default library location (R.home("library")) or the connection couldn't be found. Don't know whether that's been fixed yet. — Richie Cotton
– Richie Cotton, Commented Feb 22, 2011 at 13:05
Hi Kapil, if you got the solution for this problem, please reply with the solution. Thanks in Advance — Aada
– Aada, Commented Oct 11, 2012 at 8:07

mike · Accepted Answer · 2011-02-22 10:39:34Z

Oh god I remember this being a huge pain in the arse. Lets see if I can remember... And before I start, I warn you that I just "got this working" and never cared to work out if I could remove parts from the process.

Downloads are available from http://rcom.univie.ac.at/download.html . If I remember correctly, the RandFriends package is all you need, it installs a crapload (just install it all) but is simple. Alternatively, I think if you install the 'rscproxy' package in R you can just download the 'statconnDCOM' and install that. Memory is hazy, but I know one of these methods results in an annoying splash screen everytime you run your C# executable, and one doesn't. Although that could have just been some setting I played with.

Now, I can't remember how you verify that stuff has installed successfully. Pretty sure it comes with examples though. Once that is started, get your C# project open. Reference the following projects,

StatConnectorCommonLib
STATCONNECTORSRVLib

In your code, you will probably want to implement a IStatConnectorCharacterDevice so you get the R output coming back out in C#. Your code to initialise will then look something like,

private StatConnector _StatConn;
private IStatConnectorCharacterDevice _CharDevice;

private Whatever()
{
  // declare
  _StatConn = new StatConnectorClass();
  _CharDevice = new MyCharDevice();

  // init R, wire up char device
  _StatConn.Init("R");
  _StatConn.SetCharacterOutputDevice(_CharDevice);
}

Then you should be able to just use the functions as needed

_StatConn.EvaluateNoReturn("x <- 3");
var returnObj = _StatConn.Evalute("1 + 1");

Hope that helps.

tl;dr download RAndFriends, do fresh install with that

Thanks @mrnye for your answer. RAndFriend Package worked just fine for me.Download this package without any proxy settings.

Rob Sedgwick · Accepted Answer · 2014-01-07 23:18:43Z

0

I had a similar problem calling R.Init(), I found R.GetErrorText() returns the actual error message

answered Jan 7, 2014 at 23:18

Rob Sedgwick

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