Unresolved External Symbol Errors

Game Design
1

I got past the Iterator Debug Problem. Now I’m getting Unresolved External Symbol Errors.

I noticed in the Guide Step 2 of Setup for Visual Studip projects says add “NAKAMA_COCOS2D_SDK/libs/win64/v142” But there is no NAKAKA_COCOS2D_S2D folder in the package on GitHub. Could this be part of the problem?

There’s only “libs” and “shared libs.” I tried both of of those (adjusting for Debug and Release configurations) and still get linker errors.
Any assistance would be much appreciated! Thanks!

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2

Can anyone assist with this? I’m stuck before I can even get my project started. Has anybody else had luck with the Nakama 2.4.1 C++ Github release?

I think I’m following the directions correctly. I can only have 1 screenshot per post, so I will make several posts showing my setup in each step relative to the directions in the GitHubRelease (Forum won’t let me link). The instructions there are a little different from what’s C++ Client Guide.

In Project Settings add following:

  1. Add NAKAMA_CPP_SDK/include in C/C++ > General > Additional Include Directories

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3
  1. Add libs folder in Linker > General > Additional Library Directories :
  • NAKAMA_CPP_SDK/libs/win32/v140 - for VS 2015 x86
  • NAKAMA_CPP_SDK/libs/win64/v140 - for VS 2015 x64
  • NAKAMA_CPP_SDK/libs/win32/v141 - for VS 2017 x86
  • NAKAMA_CPP_SDK/libs/win64/v141 - for VS 2017 x64
  • NAKAMA_CPP_SDK/libs/win32/v142 - for VS 2019 x86
  • NAKAMA_CPP_SDK/libs/win64/v142 - for VS 2019 x64

I’m using VS2019 x64, so:

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4
  1. Add the .lib files in your Debug libs folder to Linker > Input > Additional Dependencies for your Debug configuration. Do the same for your Release libs and configuration.

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5

And for release:

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6

If I copy paste the “Full C++ Example” from the Client Guide and then try to start the Session Manager I get a bunch of Unresolved External Symbol Errors. They appear to be problems on objects within the Nakama libraries that I added to the linker. Can anybody advise? I would love to move forward with Nakama. Thanks!

#include <iostream>
#include "nakama-cpp/Nakama.h"

using namespace Nakama;
using namespace std;

class NakamaSessionManager
{
public:
    NakamaSessionManager()
    {
        NClientParameters parameters;

        _client = createDefaultClient(parameters);
    }

    void start(const string& deviceId)
    {
        // to do: read session token from your storage
        string sessionToken;

        if (!sessionToken.empty())
        {
            // Lets check if we can restore a cached session.
            auto session = restoreSession(sessionToken);

            if (!session->isExpired())
            {
                // Session was valid and is restored now.
                _session = session;
                return;
            }
        }

        auto successCallback = [this](NSessionPtr session)
        {
            _session = session;

            // to do: save session token in your storage
            std::cout << "session token: " << session->getAuthToken() << std::endl;
        };

        auto errorCallback = [](const NError& error)
        {
        };

        _client->authenticateDevice(deviceId, opt::nullopt, opt::nullopt, {}, successCallback, errorCallback);
    }

protected:
    NClientPtr _client;
    NSessionPtr _session;
};
int main()
{
    NakamaSessionManager sessionManager;

    sessionManager.start("mytestdevice0001");


}

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7

@lugehorsam Would you be able to suggest the settings needed to develop with the C++ client in Visual Studio?

8

Yesterday evening I was able to fix this and get it running. Once I added the proper lib folders for config and release, I needed to remove the full paths from the “additional dependencies” and just enter the filenames.

So it looks like this. With a similar one in Release configuration.
There were still additional measures I had to take before it would compile. I’ll document the complete steps for working with C++ Client in Visual Studio in another post.

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9

Thanks @mehoo and apologies for not being able to help with this particular issue in time.