Log to console from C++ DLL

I have a C++ DLL and I would like to Log to the Unity Console when in Play mode.
Is the a way to display text to the Unity console from C++ ? Can I just use 'std::cout' ?
This is not working for me. Thanks.

 

I don't think so.

I just pass strings back from my native C functions and then output it via Unity. You could just accumulate all the strings in C++ side and then have another function that returns those strings to Unity.

 

Here's a solution with a callback function:
https://stackoverflow.com/questions/43732825/use-debug-log-from-c

 

Interesting! Last time I checked you had to wait until the next frame to send stuff back... what you posted looks like it might happen immediately. Cool.

 

I assume its a direct callback to this C# class and a static class method (in memory) and therefore its frame independent, but runs on the main thread so I would use it sparingly or only in a developer build.

 

1. Thanks. I will try both of these suggestions.

 

This works wonders! Thanks

 

Try this github.
https://github.com/Darkgrouptw/UnityNativeLogger

You need to include Native api from PluginAPI (e.g. %UNITY_LOCATION%\Editor\Data\PluginAPI)
In your cpp:

static IUnityLog* mLogger;



extern "C" void UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API SendDataFromUnityToLog(float t)

{

    // Call it using the define below

    string content = "Native log: " + to_string(t);

    const char* c_content = content.c_str();

    UNITY_LOG(mLogger, c_content);

    UNITY_LOG_WARNING(mLogger, c_content);

    UNITY_LOG_ERROR(mLogger, c_content);

}



// This will be called when this plugin is loaded

extern "C" void UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API UnityPluginLoad(IUnityInterfaces * pInterfaces)

{

    // Store this IUnityLog

    mLogger = pInterfaces->Get<IUnityLog>();

    UNITY_LOG(mLogger, "Native Plugin load");

}

extern "C" void UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API UnityPluginUnload()

{

    UNITY_LOG(mLogger, "Native Plugin unload");

    mLogger = nullptr;

}

In your cs file

Code (CSharp):

1.  
2.     [DllImport("NativePlugin")]
3.     private static extern void SendDataFromUnityToLog(float _);
4.  
5.     private void Start()
6.     {
7.         UnityEngine.Random.InitState(System.DateTime.Now.Second);
8.         float randNum = UnityEngine.Random.value;
9.         Debug.Log("Unity Log: " + randNum.ToString());
10.  
11.         // Trigger the UnityPluginLoad(c++) once you call this function
12.         SendDataFromUnityToLog(randNum);
13.     }