在 C# 中使用 C++ 库
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Using c++ library in c#
提问by Prashant Cholachagudda
I am trying include c++ library (DLL) in my c# project but every time I do that I get following error message in VS2008, any suggestions?
我正在尝试在我的 c# 项目中包含 c++ 库 (DLL)，但是每次我这样做时，我都会在 VS2008 中收到以下错误消息，有什么建议吗？
EDIT:It's a C++ MFC DLL
编辑：这是一个 C++ MFC DLL
--------------------------- Microsoft Visual Studio --------------------------- A reference to 'C:\Users\cholachaguddapv\Desktop\imaging.dll' could not be added. Please make sure that the file is accessible, and that it is a valid assembly or COM component.
--------------------------- Microsoft Visual Studio --------------------------- A reference to 'C:\Users\cholachaguddapv\Desktop\imaging.dll' could not be added. Please make sure that the file is accessible, and that it is a valid assembly or COM component.
采纳答案by Lucero
If it is a "normal" DLL (not COM, not managed C++), you cannot add a reference like this. You have to add p/invoke signatures (external static method definitions) for the exports you want to call in your DLL.
如果它是“普通”DLL（不是 COM，不是托管 C++），则不能添加这样的引用。您必须为要在 DLL 中调用的导出添加 p/invoke 签名（外部静态方法定义）。
[DllImport("yourdll.dll")]
public static extern int ExportToCall(int argument);
Have a look at the DllImportattribute in the online help.
查看联机帮助中的DllImport属性。
回答by Jacob Stanley
If it's a straight C++ library then it's not possible to reference it in this way.
如果它是一个直接的 C++ 库，那么就不可能以这种方式引用它。
You have two options, you can compile the C++ library as an assembly an expose the unmanaged code with a C++/CLI wrapper.
您有两个选择，您可以将 C++ 库编译为程序集，并使用 C++/CLI 包装器公开非托管代码。
-or-
-或者-
You can use some p/invoke calls if the library exposes it's functionality via a C API.
如果库通过 C API 公开其功能，您可以使用一些 p/invoke 调用。
Could you expand the question a bit to include some details about how you normally call imaging.dll from c++?
您能否稍微扩展一下问题，以包括一些有关您通常如何从 C++ 调用 imageing.dll 的详细信息？
回答by James Curran
Calling convention and memory model difference between managed code (C#) and non-Managed code (WIn32 C++) make them incompatible.
托管代码 (C#) 和非托管代码 (WIn32 C++) 之间的调用约定和内存模型差异使它们不兼容。
However, .NET include a bridge technology for COM objects, so if you imaging DLL were a COM object, it could be made to work. It is, however, apparently not a COM object.
但是，.NET 包含 COM 对象的桥接技术，因此如果您将 DLL 映像为 COM 对象，则它可以工作。但是，它显然不是 COM 对象。
回答by Dave Van den Eynde
If it's a clean C++ DLL where you only export C compatible functions, then you can use P/Invoke to use those functions. If you turn that C++ DLL into a COM DLL with a Type Library, using it is even easier: you can import the type library into .NET and .NET wrappers (called Runtime Callable Wrappers) are created for you.
如果它是一个干净的 C++ DLL，您只导出与 C 兼容的函数，那么您可以使用 P/Invoke 来使用这些函数。如果您将该 C++ DLL 转换为带有类型库的 COM DLL，则使用它会更容易：您可以将类型库导入到 .NET 中，并且会为您创建 .NET 包装器（称为运行时可调用包装器）。
回答by The real napster
if it is a unmanaged dll you cannot add a reference to it. You have to invoke it using pinvoke or the likes of it:
如果它是非托管 dll，则无法添加对它的引用。您必须使用 pinvoke 或类似的方法调用它：
public classFoo
{
[DllImport("myunmanaged.dll", CharSet = CharSet.Ansi)]
private extern static int UnmanagedFunction(int type, int dest);
}
If you wanna convert it to a managed dll take a look here: http://msdn.microsoft.com/en-us/library/aa446538.aspx
如果您想将其转换为托管 dll，请查看此处：http: //msdn.microsoft.com/en-us/library/aa446538.aspx
If you wanna know some more about pinvoke and dllimport take a look here: http://msdn.microsoft.com/en-us/library/aa288468.aspx
如果您想了解有关 pinvoke 和 dllimport 的更多信息，请查看此处：http: //msdn.microsoft.com/en-us/library/aa288468.aspx
Cheers
干杯
