在 Unity 中使用 DLL，MonoBehaviour

Posted 2023-02-22

【中文标题】在 Unity 中使用 DLL，MonoBehaviour

【英文标题】：Using DLL in Unity, MonoBehaviour

【发布时间】：2014-05-22 20:08:13

【问题描述】：

我有一个用 C 语言编写的机翼几何和流动求解器代码库。我制作了一个简单的测试项目，用于调试库、我的 C# 包装类和我的主项目之间的一些集成问题。在这个测试项目中，我有一个测试脚本：

using UnityEngine;
using System;
using System.Collections.Generic;
using System.Collections;
using System.Runtime.InteropServices;

public class testScript2 : MonoBehaviour 
    // external functions
    [DllImport( "TestLib" )]
    public static extern void makeWing( ref stripCalcStruct wing, 
        int n_sections, bool isSwept, double sweep );
    [DllImport( "TestLib" )]
    public static extern void makeComp( ref stripCalcStruct wing, 
        ref compNILLStruct wingComp );
    [DllImport( "TestLib" )]
    public static extern void NILLWingEx( ref stripCalcStruct wing,
        ref compNILLStruct comp, ref outNILL results, bool simpsons );

    // member variables to store computation results
    public double calculation1 = 0.0;
    public double calculation2 = 0.0;
    public double calculation3 = 0.0;
    public double calculation4 = 0.0;
    public double calculation5 = 0.0;
    public double calculation6 = 0.0;

    // Use this for initialization
    void Start () 
        // this is my "main" program
        // initialize some geometric parameters
        int numCS = 2;
        int numControlStations = 2;
        int numAirfoils = 1;
        int numAiCoeffs = 10;
        int n_sections = 40;

        // Create a StripController
        StripController controller1 = new StripController(
            n_sections, numCS, numControlStations, numAirfoils, numAiCoeffs );
        controller1.tryStuff();
        // Fill the wing geometry with a default wing from the library
        makeWing( ref controller1.wing, 40, false, 0.0 );
        // save a piece to see that it worked
        calculation1 = controller1.wing.area;
        // Fill computational state parameters with default values from the library
        makeComp( ref controller1.wing, ref controller1.comp );
        // save a piece to see that it worked
        calculation2 = controller1.getAlphaAtIndex( 0 );
        // Call the flow solver from the library
        NILLWingEx( ref controller1.wing, ref controller1.comp, 
            ref controller1.results, false );
        // save the required computation time
        calculation3 = controller1.results.time;
        // free pinned memory in the controller
        controller1.freeStuff();

        /* Try this again, but this time call the NILLWingEX function from
         * within the StripController file */
        StripController controller2 = new StripController(
            n_sections, numCS, numControlStations, numAirfoils, numAiCoeffs );
        controller2.tryStuff();
        makeWing( ref controller2.wing, 40, false, 0.0 );
        calculation4 = controller2.wing.area;
        makeComp( ref controller2.wing, ref controller2.comp );
        calculation5 = controller2.getAlphaAtIndex( 0 );
        controller2.EvalNILL(); // This fails
        calculation6 = controller2.results.time;
        controller2.freeStuff();
    

    // Update is called once per frame
    void Update () 

    

    void OnGUI()
    
        // display our computation results on the screen
        GUI.Label( new Rect( 100f, 100f, 500f, 20f ), calculation1.ToString() );
        GUI.Label( new Rect( 100f, 120f, 500f, 20f ), calculation2.ToString() );
        GUI.Label( new Rect( 100f, 140f, 500f, 20f ), calculation3.ToString() );
        GUI.Label( new Rect( 100f, 160f, 500f, 20f ), calculation4.ToString() );
        GUI.Label( new Rect( 100f, 180f, 500f, 20f ), calculation5.ToString() );
        GUI.Label( new Rect( 100f, 200f, 500f, 20f ), calculation6.ToString() );
    

有一个 StripController.cs 文件包含 StripController 类。类的顶部是这样的

public class StripController

    [DllImport( "TestLib" )]
    public static extern void NILLWingEX( ref stripCalcStruc wing,
         ref compNILLStruct comp, ref outNILL results, bool simpsons );

因此它与另一个文件具有相同的外部NILLWingEX 定义。 EvalNILL() 方法看起来像这样

public void EvalNILL()

    NILLWingEX( ref wing, ref comp, ref results, false );

在测试脚本文件中，在第一个块中使用StripController 并在本地调用NILLWingEX 可以正常工作。但是在第二个块中，我从该文件中调用了StripController 调用NILLWingEX，我得到了一个EntryPointNotFoundException: NILLWingEX。所以我可以从测试脚本文件中调用外部函数，但不能从我的其他文件中调用？这与从 MonoBehaviour 继承有关吗？这是否与测试脚本附加到游戏对象（主摄像头）这一事实有关？

如有任何帮助澄清何时/何地可以和不能在 Unity 中调用库函数，我们将不胜感激。

【问题讨论】：

在不从 MonoBehaviour 继承的类中使用 DLL 没有问题。

testScript2 和 StripController 是否都存在于同一个 Unity 项目中？

【参考方案1】：

实际上，我似乎还不够挑剔。测试脚本调用NILLWingEx 和StripController 调用NILLWingEX 并带有大写的“X”。我不确定那是怎么进去的。所以我才吹了一天半的错字...