tr8dr / .net-bridge Goto Github PK

Will it be possible to access results returned as a reference in the function call argument, like here:
MathNet.Numerics.Distributions.Normal.Samples(System.Double[],System.Double,System.Double)

        <summary>
        Fills an array with samples generated from the distribution.
        </summary>
        <param name="values">The array to fill with the samples.</param>
        <param name="mean">The mean (μ) of the normal distribution.</param>
        <param name="stddev">The standard deviation (σ) of the normal distribution. Range: σ ≥ 0.</param>
        <returns>a sequence of samples from the distribution.</returns>
    </member>

Is there a way to access constants of a static class? The code would look like

namespace MyNamespace
{
public static class MyConstants
{
public const int CONST_1 = 38;
public const int CONST_2 = 20;
public const int CONST_3 = 100;
...

The version of rDotNet in CRAN is 0.9.1, but unfortunately that version does not handle multiple DLLs in the .cinit...() function (interestingly, the CLRServer in that package DOES handle multiple DLLs).

The github project is up to 0.9.2 and the commit message states that the .cinit function has been extended to handle multiple DLLs ("adjusted rDotNet cinit function to accept multiple dlls")

Is there any chance of publishing version 0.9.2 of rDotNet to CRAN?

Thanks,
Andrew

there seems to be a bug intruduced with issue #3

I have installed the package and dependencies and am attempting to import a custom DLL however I get the following error when attempting to import it.
I would like to know if I am doing something wrong or if this is a known bug.

Traceback (most recent call last):
  File ".\test.py", line 10, in <module>
    printer = clr.new("Printer.Printer")
  File "D:\test\.Net-Bridge\venv\lib\site-packages\pydotnet\clr\CLRApi.py", line 123, in new
    return rep.toValue()
  File "D:\test\.Net-Bridge\venv\lib\site-packages\pydotnet\clr\data\CLRException.py", line 56, in toValue
    raise Exception (self.value)
Exception: System.ArgumentException: could not find type: Printer.Printer
   ? bridge.common.reflection.Creator.NewInstanceByName(String typename, Object[] args) dans d:\test\.Net-Bridge\src\Python\pyDotNet\server\Library.cs:ligne 16939
   ? bridge.embedded.CLRBridgeEmbedded.Create(String classname, Object[] parameters) dans d:\test\.Net-Bridge\src\Python\pyDotNet\server\Library.cs:ligne 84
   ? bridge.server.CLRBridgeServerClient.HandleCreate(CLRCreateMessage req) dans d:\test\.Net-Bridge\src\Python\pyDotNet\server\Library.cs:ligne 1057
WARN  [2020-05-29 09:36:27.904]: receipt of messsage failed: System.IO.EndOfStreamException: End of stream reached with 1 byte left to read
   à bridge.common.io.SameEndianReader.InternalReadByte() dans d:\test\.Net-Bridge\src\Python\pyDotNet\server\Library.cs:ligne 10400
   à bridge.common.io.SameEndianReader.ReadUInt16() dans d:\test\.Net-Bridge\src\Python\pyDotNet\server\Library.cs:ligne 10221
   à bridge.server.CLRMessage.Read(IBinaryReader stream) dans d:\test\.Net-Bridge\src\Python\pyDotNet\server\Library.cs:ligne 1422
   à bridge.server.CLRBridgeServerClient.Service() dans d:\test\.Net-Bridge\src\Python\pyDotNet\server\Library.cs:ligne 980, stack:    à bridge.common.io.SameEndianReader.InternalReadByte() dans d:\test\.Net-Bridge\src\Python\pyDotNet\server\Library.cs:ligne 10400
   à bridge.common.io.SameEndianReader.ReadUInt16() dans d:\test\.Net-Bridge\src\Python\pyDotNet\server\Library.cs:ligne 10221
   à bridge.server.CLRMessage.Read(IBinaryReader stream) dans d:\test\.Net-Bridge\src\Python\pyDotNet\server\Library.cs:ligne 1422
   à bridge.server.CLRBridgeServerClient.Service() dans d:\test\.Net-Bridge\src\Python\pyDotNet\server\Library.cs:ligne 980

Here is the C# file used to generate the dll

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Printer
{
    public class Printer
    {
        public void Print(string text)
        {
            Console.WriteLine(text);
        }
    }
}

And here is the python code I am using to import it

import os
virtual_env = os.environ['VIRTUAL_ENV']

print(f"Venv:{virtual_env}")

from pydotnet.clr.CLRApi import CLRApi

clr = CLRApi(hostname="localhost", dll="Printer.dll")

printer = clr.new("Printer.Printer")
printer.Print("HelloWorld!")

Given that I am using a virtualenv I also had to modifiy CLRApi.py l.77 like so
server = "%s/Lib/site-packages/pydotnet/server/CLRServer.exe" % os.environ["VIRTUAL_ENV"]

I am on Windows 10 using python3.6.8

This is the dll file generated
Printer.zip

First, thank you for a developing this awesome solution for accessing .NET from R and Python.

I'm looking for documentation or best practices guidance on using RDotNet and the .Net-Bridge in an R package. My current strategy is to use .cinit in the .onLoad() namespace hook to spin up the CLRServer and load the necessary DLL (recognizing that this could cause conflicts with other packages that also use CLRServer, but the solution to #4 would resolve that). What's not clear to me is what I should do when the R session is closed or the package is unloaded. Is there a command to quit the server? Is there any cleanup I need to do to delete objects created by .cnew? Some additional guidance documents would be helpful.

Hi Jonathan,

I have a further question regarding the rDotNet package:

Currently one can only load one dll and R has to be restarted if another dll has to be loaded. The ref-manual states:

the .NET libraries are to be changed, the CLRServer process and R should be restarted.

This behavior in some situations can have some tricky side-effects. For example (to the best of my knowledge) it is not possible to parallely run two R-Scripts (via RScript.exe) where one R-Script has to load and use a.dll and the other process b.dll.

To be honest, I'm not an expert in .NET at all, but would it be possible to change CLRServer.exe in a way, that each R-Thread can assemble an own and independent connection to the server. (Like the DBI package for databases, where it is possible to independently connect to the database (if that is a good example))

Thanks and Cheers
Simon

Sometimes the internal cache dictionaries for ObjectId and objects gets corrupted and the program tries to access a key that does not exist. Currently only fixable by restarting the server.

CLRObjectProxy.cs

Hi,
currently one can only specify one dll-file in the .cinit function of the rDotNet package. This could easily be fixed by changing the internal .initialize function of the rDotNet package.

First besides the inside functions expand.dll and or one had to specify a further function as:

enlarge.dll <- function(dll) {
	server.args <- rep(NA, length(dll) * 2)
	for (i in 1:length(server.args)) {
		if (i%%2 == 1) {
			server.args[i] <- "-dll" 
		} else {
			server.args[i] <- dll[[i/2]]
		}
	}
	return(server.args)
}

And change the part where the arguments are sent to CLRServer.exe

if (!is.null(dll))
   server.args <- c(server.args, "-dll", enlarge.dll(expand.dll(dll)))
else if (dll.env != "")
   server.args <- c(server.args, "-dll", expand.dll(dll.env))

Best Simon

For compatibility with Python 3.10 the import for DataUtil.py need to change:

import numpy as np

import pandas as pd

try:
    
    from collections.abc import Iterable

except ImportError:
    
    from collections import Iterable

from scipy.stats import *