C＃导入C ++ dll [英] C# importing C++ dll

问题描述

我有一个托管的dll文件，该文件将功能从C ++ dll导入到托管的环境中。我在程序中使用了它的某些功能，但问题是，使用它时出现此错误：

I have a managed dll file which imports functions from a C++ dll to the managed environment. I'm using some of its functions in my program but the problem is, I get this error when I use it:

无法加载DLL'Libraries\lib。 dll'：找不到指定的模块。 （来自HRESULT的异常：0x8007007E）

Unable to load DLL 'Libraries\lib.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

我将.dll文件放在程序的目录和system32文件夹中。但是，它仍然不起作用。我想我必须使用DLLImport，但我不知道如何使用它。即使看了一些示例，我仍然感到困惑。有人可以在这里帮我吗？

I placed the .dll file in the program's directory and in the system32 folder. However, it still doesn't work. I think I have to use DLLImport but I have no idea how to use it.. even after looking at some examples I am still confused. Can someone help me here?

推荐答案

您说：

我将.dll文件放在程序目录中...

I placed the .dll file in the program's directory...

但是：

无法加载DLL 'Libraries\lib.dll'

我们需要查看您的 DLLImport 属性的创建，即本机方法的C＃签名。在我看来，您似乎已指定路径，即

We need to see your DLLImport attribute creation, i.e., the C# signature of the native method. It looks to me like you probably specify the path, i.e.,

[DLLImport( "Libraries\lib.dll" )];
static extern void MyNativeMethod();

尝试使用此代替：

[DLLImport( "lib.dll" )];
static extern void MyNativeMethod();

这将搜索运行目录以及通过您的 PATH 环境变量。如果您按原样指定文件路径，老实说，我不知道如果找不到该文件，它是否会通过 PATH 搜索（我找不到在其中提及该文件的路径） 文档）。

That will search the running directory as well as through your PATH environment variable. If you specify a file path as you do I honestly don't know if it will search through PATH if the file is not found (I couldn't find mention of it in the docs).

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