用于C ++ DLL的unity3d插件中的DllNotFoundException

问题描述

我正在研究Unity Plugin项目，并尝试从c#文件导入c ++本机dll.但是我一直在获取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到位并且文件存在.正常工作.所有依赖的dll都存在于相同的层次结构中，但我仍然会遇到dllnotfound异常.

任何帮助，万分感谢！

解决方案

感谢此 Unity论坛帖子我想出了一个不错的解决方案，该解决方案在运行时修改了PATH -environment变量:

• 在Project\Assets\Wherever\Works\Best\Plugins中放置所有个DLL(Unity与之交互的DLL及其依赖的DLL).

• 将以下静态构造函数放入使用插件的类中:

  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]添加到类中，以确保构造函数为在编辑器上运行发射:

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

使用此脚本，无需在DLL周围进行复制. Unity编辑器在Assets/.../Plugins/...文件夹中找到它们，而可执行文件在..._Data/Plugins-目录中找到它们(构建时会在其中自动复制它们).

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 code:

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

c# code:

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

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.

Any help, much appreciated!!

解决方案

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

• Put all DLLs (both the DLLs which Unity interfaces with and their dependent DLLs) in Project\Assets\Wherever\Works\Best\Plugins.

• 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);
  }
  

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

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

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).

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