c++ dll的unity3d插件中的DllNotFoundException [英] DllNotFoundException in unity3d plugin for c++ dll

问题描述

我正在开发 Unity Plugin 项目并尝试从 c# 文件导入 c++ 原生 dll.但我不断收到 dllnotfoundexception.

I am working on the Unity Plugin project and try to import the c++ native dll from c# file. But I keep getting dllnotfoundexception.

c++ dll 代码:

extern "C" {
extern __declspec( dllexport ) bool IGP_IsActivated();
}

c# 代码:

[DllImport("mydll")]
    private static extern bool IGP_IsActivated();

Dll 就位并且 FIle.Exists 正常工作.所有依赖的 dll 都存在于相同的层次结构中，但我仍然以 dllnotfound 异常结束.

Dll is in place and FIle.Exists work properly. All dependent dlls are present at same hierarchy, but I still end up in dllnotfound exception.

任何帮助，非常感谢！！

Any help, much appreciated!!

推荐答案

感谢这个 Unity 论坛帖子 我想出了一个很好的解决方案，它在运行时修改 PATH-环境变量:

Thanks to this Unity forum post I came up with a nice solution which modifies the PATH-environment variable at runtime:

• 将所有的 DLL(包括 Unity 接口的 DLL 及其依赖的 DLL)放在 ProjectAssetsWhereverWorksBestPlugins 中.

• 将以下静态构造函数放入使用插件的类中:

• Put all DLLs (both the DLLs which Unity interfaces with and their dependent DLLs) in ProjectAssetsWhereverWorksBestPlugins.

• Put the following static constructor into a class which uses the plugin:

static MyClassWhichUsesPlugin() // static Constructor
{
    var currentPath = Environment.GetEnvironmentVariable("PATH",
        EnvironmentVariableTarget.Process);
#if UNITY_EDITOR_32
    var dllPath = Application.dataPath
        + Path.DirectorySeparatorChar + "SomePath"
        + Path.DirectorySeparatorChar + "Plugins"
        + Path.DirectorySeparatorChar + "x86";
#elif UNITY_EDITOR_64
    var dllPath = Application.dataPath
        + Path.DirectorySeparatorChar + "SomePath"
        + Path.DirectorySeparatorChar + "Plugins"
        + Path.DirectorySeparatorChar + "x86_64";
#else // Player
    var dllPath = Application.dataPath
        + Path.DirectorySeparatorChar + "Plugins";

#endif
    if (currentPath != null && currentPath.Contains(dllPath) == false)
        Environment.SetEnvironmentVariable("PATH", currentPath + Path.PathSeparator
            + dllPath, EnvironmentVariableTarget.Process);
}

将 [InitializeOnLoad] 添加到类以确保构造函数为 在编辑器启动时运行:

Add [InitializeOnLoad] to the class to make sure that the constructor is run at editor launch:

 [InitializeOnLoad]
 public class MyClassWhichUsesPlugin
 {
     ...
     static MyClassWhichUsesPlugin() // static Constructor
     {
         ...
     }
  }

使用此脚本无需复制 DLL.Unity 编辑器在 Assets/.../Plugins/... 文件夹中找到它们，可执行文件在 ..._Data/Plugins 目录中找到它们(其中它们在构建时会自动复制).

With this script there is no need to copy around DLLs. The Unity editor finds them in the Assets/.../Plugins/...-folder and the executable finds them in ..._Data/Plugins-directory (where they get automatically copied when building).

这篇关于c++ dll的unity3d插件中的DllNotFoundException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！