无法调用DLL导入条目，C#-> C ++，EntryPointNotFoundException [英] Cannot call DLL import entry, C# -> C++, EntryPointNotFoundException

问题描述

我正在尝试从C#调用用C ++编写的自定义DLL中的函数.但是我在代码分析过程中收到警告，并在运行时收到错误:

I'm trying to call from C# a function in a custom DLL written in C++. However I'm getting the warning during code analysis and the error at runtime:

警告:CA1400: Microsoft.Interoperability:正确 的声明 "SafeNativeMethods.SetHook()"，以便 它正确地指向一个现有的 wi.dll中的入口点.不受管 当前链接到的入口点名称 是SetHook.

Warning: CA1400 : Microsoft.Interoperability : Correct the declaration of 'SafeNativeMethods.SetHook()' so that it correctly points to an existing entry point in 'wi.dll'. The unmanaged entry point name currently linked to is SetHook.

错误: System.EntryPointNotFoundException原为 未处理.找不到条目 DLL"wi.dll"中名为"SetHook"的点.

Error: System.EntryPointNotFoundException was unhandled. Unable to find an entry point named 'SetHook' in DLL 'wi.dll'.

两个项目wi.dll和C#exe均已编译到同一个DEBUG文件夹中，两个文件均位于此处.整个文件系统中只有一个名为wi.dll的文件.

Both projects wi.dll and C# exe has been compiled in to the same DEBUG folder, both files reside here. There is only one file with the name wi.dll in the whole file system.

C ++函数定义如下:

C++ function definition looks like:

#define WI_API __declspec(dllexport)
bool WI_API SetHook();

我可以使用Dependency Walker看到导出的功能:

I can see exported function using Dependency Walker:

as decorated: bool SetHook(void)
as undecorated: ?SetHook@@YA_NXZ

C#DLL导入看起来像(我已经使用MSDN杂志中的CLRInsideOut定义了这些行):

C# DLL import looks like (I've defined these lines using CLRInsideOut from MSDN magazine):

[DllImport("wi.dll", EntryPoint = "SetHook", CallingConvention = CallingConvention.Cdecl)]
[return: MarshalAsAttribute(UnmanagedType.I1)]
internal static extern bool SetHook();

我也尝试过不使用EntryPoint和CallingConvention定义.

I've tried without EntryPoint and CallingConvention definitions as well.

两个项目都是32位，我使用的是W7 64位，VS 2010 RC.

Both projects are 32-bits, I'm using W7 64 bits, VS 2010 RC.

我相信我只是忽略了一些东西....

I believe that I simply have overlooked something....

提前谢谢.

推荐答案

好，您知道入口点名称，请使用[DllImport]属性中的EntryPoint =?SetHook @@ YA_NXZ"属性.或者在您的C ++代码中的声明前加上extern"C"，这样名称就不会被弄乱.

Well, you know the entry point name, use the EntryPoint = "?SetHook@@YA_NXZ" property in the [DllImport] attribute. Or put extern "C" before the declaration in your C++ code so the name doesn't get mangled.

[DllImport("wi.dll", EntryPoint = "?SetHook@@YA_NXZ", CallingConvention = CallingConvention.Cdecl)]
[return: MarshalAsAttribute(UnmanagedType.I1)]
internal static extern bool SetHook();

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