public class Test : MonoBehaviour

{

    public string output = "";

    public string stack = "";

    void OnEnable()

    {

        Application.RegisterLogCallback(HandleLog);

    }

    void OnDisable()

    {

        Application.RegisterLogCallback(null);

    }

    void HandleLog(string logString, string stackTrace, LogType type)

    {

        output = logString;

        stack = stackTrace;

    }

}