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  • About
  • Environment
  • Library Files Preparation
  • Hello World
  • Use Baku.LibqiDotNet in UnityEngine
  • Contact


This project is .NET wrapper library for the messaging framework "qi Framework (libqi)" which originates from Aldebaran robotics. To see about original projects, please visit:


Developed by Windows 10/Visual Studio 2015 Community. Expected environment is:

  • Windows 7 or later
  • .NET 3.5 or later
  • 32bit

As targetted for .NET 3.5, this library also runs on UnityEngine.

Library Files Preparation

This library is only a wrapper code, NOT translated implementation of native(C++) libqi, so you have to get original library (*.dll) files. There are two ways to get it.

Recommended: use custom builded dlls

Author distributes customed library for Baku.LibqiDotNet. Customization is actually a simple implementatio of libqi-capi, please see the detail for closed issue (sorry that the discussion is written in Japanese, but the most meaningful part is C++ source code so you would understand what I did).

To get the custom library,

  1. Download .zip from Google Drive
  2. Copy dlls folder in zip archives to your program's working directory

You can change the folder name dlls to another one, but be carefully to do it, as the the folder name is used in sample code.

NOT recommended: use official binary

I can imagine that some of you will hesitate to get and use raw *.dll from an indivisual's Google Drive. OK, you are right, and there is alternative way to get it from Aldebaran Robotics' official source.

CAUTION: Almost all things work well by this way, but binary data (QiByteData class) functions are NOT available when you get *.dlls in this way.

  1. Get Pynaoqi SDK from Aldebaran Robotics' web site and install it to your PC
  2. After the installation, Python's Libs/site-packages directory (or childs director of it) will have "qi.dll", "qic.dll", and some boost *.dlls
  3. Create dlls directory on your program's working directory, and copy & paste *.dll files into it

Hello World

Baku.LibqiDotNet allows you to use the qi Framework in a natural way almost same as C++/Python/Java. The basic operation consists of:

  • Create and connect session (by static method QiSession.Create)
  • Get service from session (by QiSession.GetService). The service is expressed as QiObject instance.
  • Call a method with args (by QiObject["methodName"].Call(params[] args))

Baku.LibqiDotNet has special type expressions like QiBool, QiInt32. By using implicit cast operations, you can use primitive value literals instead of those class' instances.

using System;

using Baku.LibqiDotNet;
using Baku.LibqiDotNet.Path;

namespace HelloWorld
    class Program
        static void Main(string[] args)
            //Add `dlls` directory to candidates to search unmanaged library files
            PathModifier.AddEnvironmentPath("dlls", PathModifyMode.RelativeToEntryAssembly);

            //Connect by IP and Port(port number has default value 9559)
            string address = "tcp://";
            var session = QiSession.Create(address);

            Console.WriteLine($"Connected? {session.IsConnected}");
            if (!session.IsConnected)
                Console.WriteLine("end program because there is no connection");

            //Text to speech module, one of the most popular service in Aldebaran's robots.
            var tts = session.GetService("ALTextToSpeech");

            //Call "say" function with string arg (note: string argument will be translated to QiString)
            tts["say"].Call("this is test");


Use Baku.LibqiDotNet in UnityEngine

Japanese instruction to use this library in UnityEngine can be found at here. Sample Unity package is available in Google Drive.

  1. Define "UNITY" compile symbol in "Baku.LibqiDotNet" project (in VS 2015, compile symbol can be defined in project's property -> build).
  2. Build the project
  3. Open and create new Unity Project.
  4. Put "Baku.LibqiDotNet.dll" in Assets
  5. Create "Plugins" folder in Assets, and "x86" child folder.
  6. Copy unmanaged *.dll files, which introduced in "Library Files Preparation", to "x86" folder.

cf. The compile symbol "UNITY" switches DllImport attributes's argument. The symbol is used in DllImportSettings.cs.


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