#環境
Unity5.6.2f1
#概要
C#側からc++側に関数を登録して、c++側から登録した関数を呼び出します
エコープログラムです
#AndroidStudioとUnityの事前設定
以下を参照してプロジェクトを作成する
Android用ネイティブレンダリングPlugin(c++[so])の作成
「libnativecpp.so」としてエクスポートされるようにする
「MultiThreadedRendering」にチェックを入れなくていい
今回はレンダリングは関係ない為
#CMakeLists.txt
# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html
# Sets the minimum version of CMake required to build the native library.
cmake_minimum_required(VERSION 3.4.1)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
native-lib
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
Test.cpp
)
# Specifies a path to native header files.
include_directories( Unity/ )
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log
)
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
native-lib
# Links the target library to the log library
# included in the NDK.
${log-lib}
)
#プログラム
Assets/TestNativePlugin.cs
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.UI;
using System.Runtime.InteropServices;
public class TestNativePlugin : MonoBehaviour
{
[SerializeField] Text _text = null;
[DllImport ("nativecpp")]
public static extern void SetEchoCallbackFunction( UnityAction<string> func );
[DllImport ("nativecpp")]
public static extern void TestEcho( string message );
private static TestNativePlugin _instance = null;
private void Awake()
{
_instance = this;
}
private void OnDestroy()
{
_instance = null;
}
private void OnApplicationQuit()
{
OnDestroy();
}
private void OnEnable()
{
SetEchoCallbackFunction( OnNativeCallback );
}
private void OnDisable()
{
SetEchoCallbackFunction( null );
}
private void Start()
{
TestEcho( "hello world!" );
}
private void OnNativeCallback( string message )
{
Debug.Log( message );
_instance.SetText( message );
}
private void SetText( string message )
{
if( _text == null )
return;
_text.text = message;
}
}
Test.cpp
#include "IUnityInterface.h"
#include <math.h>
#include <stdio.h>
#include <assert.h>
extern "C"
{
using EchoCallback = void(*)( const char* );
namespace
{
EchoCallback onEchoCallback = NULL;
}
UNITY_INTERFACE_EXPORT void SetEchoCallbackFunction( EchoCallback func )
{
onEchoCallback = func;
}
UNITY_INTERFACE_EXPORT void TestEcho( const char* pMessage )
{
if ( onEchoCallback == NULL )
return;
onEchoCallback( pMessage );
}
}