使用 extern c 和 dllexport 与模块定义 (msvc++) 进行

问题描述

我试图为 dll 导出一个简单的测试函数，以便与指定调用约定的应用程序(仅供参考:mIRC)一起使用:

int __stdcall test_func(HWND mWnd, HWND aWnd, char *data, char *parms, BOOL show, BOOL nopause)

现在，要从应用程序调用它，我将使用 test_func 但我注意到由于名称修改，它并不像我想象的那么简单.

通过这里的类似主题，我了解到将 extern "C" 与 __declspec(dllexport) 结合使用是一种消除重整的等效(有点)方法到模块定义 (.def).但是，当使用 extern/dllexport 方法时，我的函数(作为示例)始终是 _test_func@numbers 而 .def 删除了我需要导出到的应用程序所需的所有重整.>

谁能解释一下这是为什么?我只是对这两种方法很好奇.谢谢！

dllexport/import 被设计为自己加载回来，而不是使用 GetProcAddress 的旧 C 库.您所看到的重整是所有 Microsoft 编译器长期以来对 __stdcall 函数所做的.最有可能的是，您的目标需要一个 __cdecl 函数，而不是 __stdcall，但如果没有，您将需要使用 .def 文件来专门取消对名称的处理.

I was trying to export a simple test function for a dll to work with an application (fyi: mIRC) that specifies the calling convention as:

int __stdcall test_func(HWND mWnd, HWND aWnd, char *data, char *parms, BOOL show, BOOL nopause)

Now, to call this from the application, I'd be using test_func but I have noticed due to name mangling it is not as simple as I'd thought.

Through similar topics here I have come to the understanding that using extern "C" in combination with __declspec(dllexport) is an equivelant (somewhat) method of removing mangling to module definitions (.def). However, when using the extern/dllexport method my function (as an example) is always _test_func@numbers whereas the .def removed all mangling as required for use with the application i needed to export to.

Could someone please explain why this is? I'm just curious about the two methods. Thanks!

dllexport/import are designed to be loaded back by themselves, not an old C library using GetProcAddress. The mangling you have seen is what all Microsoft compilers have done for a long time for __stdcall functions. Most likely, your target either expects a __cdecl function, not __stdcall, but if not, you will need to use a .def file to specifically un-mangle the name.

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