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November 16, 2022 15:40
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ASP.NET Core SignalR C++ Client

This project is part of ASP.NET Core. You can find samples, documentation and getting started instructions for ASP.NET Core at

Use for issues with this project.

Install this library

There are multiple ways to build this library

  • Use vcpkg and install the library with vcpkg install microsoft-signalr
  • Build from command line
  • Build in Visual Studio (must have the "Desktop Development with C++" workload) by selecting the "Open a local folder" option and selecting the repository root folder

Command line build

Below are instructions to build on different OS's. You can also use the following options to customize the build:

Command line Description Default value
-DBUILD_SAMPLES Build the included sample project false
-DBUILD_TESTING Builds the test project true
-DUSE_CPPRESTSDK Includes the CppRestSDK (default http stack) (requires cpprestsdk to be installed) false
-DUSE_MSGPACK Adds an option to use the MessagePack Hub Protocol (requires msgpack-c to be installed) false
-DWERROR Enables warnings as errors true
-DWALL Enables all warnings true
-DINJECT_HEADER_AFTER_STDAFX=<header path> Adds the provided header to the library compilation in stdafx.cpp, intended to allow "new" and "delete" to be replaced. <none>

Build on Windows

PS> git submodule update --init
PS> .\submodules\vcpkg\bootstrap-vcpkg.bat
PS> .\submodules\vcpkg\vcpkg.exe install cpprestsdk[websockets]:x64-windows jsoncpp:x64-windows
PS> mkdir build.release
PS> cd build.release
PS> cmake .. -A x64 -DCMAKE_TOOLCHAIN_FILE="..\submodules\vcpkg\scripts\buildsystems\vcpkg.cmake" -DCMAKE_BUILD_TYPE=Release -DUSE_CPPRESTSDK=true
PS> cmake --build . --config Release

Output will be in build.release\bin\Release\

Build on Mac

$ git submodule update --init
$ brew install gcc6
$ ./submodules/vcpkg/
$ ./submodules/vcpkg/vcpkg install cpprestsdk[websockets] jsoncpp
$ mkdir build.release
$ cd build.release
$ cmake .. -DCMAKE_TOOLCHAIN_FILE=../submodules/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_BUILD_TYPE=Release -DUSE_CPPRESTSDK=true
$ cmake --build . --config Release

Output will be in build.release/bin/

Build on Linux

$ git submodule update --init
$ ./submodules/vcpkg/
$ ./submodules/vcpkg/vcpkg install cpprestsdk[websockets] boost-system boost-chrono boost-thread jsoncpp
$ mkdir build.release
$ cd build.release
$ cmake .. -DCMAKE_TOOLCHAIN_FILE=../submodules/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_BUILD_TYPE=Release -DUSE_CPPRESTSDK=true
$ cmake --build . --config Release

Output will be in build.release/bin/

Example usage

#include <iostream>
#include <future>
#include "signalrclient/hub_connection.h"
#include "signalrclient/hub_connection_builder.h"
#include "signalrclient/signalr_value.h"

std::promise<void> start_task;
signalr::hub_connection connection = signalr::hub_connection_builder::create("http://localhost:5000/hub").build();

connection.on("Echo", [](const std::vector<signalr::value>& m)
    std::cout << m[0].as_string() << std::endl;

connection.start([&start_task](std::exception_ptr exception) {


std::promise<void> send_task;
std::vector<signalr::value> args { "Hello world" };
connection.invoke("Echo", args, [&send_task](const signalr::value& value, std::exception_ptr exception) {


std::promise<void> stop_task;
connection.stop([&stop_task](std::exception_ptr exception) {


Example CMake file

cmake_minimum_required (VERSION 3.5)
project (signalrclient-sample)

find_package(microsoft-signalr REQUIRED)

add_executable (sample sample.cpp)