将静态链接库转换为动态 dll [英] Converting static link library to dynamic dll

问题描述

我有 .lib 文件及其标头 (.h) 文件.该文件有一些需要在 C# 应用程序中使用的函数.

I have .lib file with its header (.h) file. This file have a few functions that need to be used in C# application.

谷歌搜索后，我发现我需要从这个静态库创建一个动态 DLL，并使用互操作从 C# 代码中调用这个动态 DLL.

After googling I found that I need to create a dynamic DLL from this static library and call this dynamic DLL from C# code using interop.

1. 我已经创建了一个 win32 项目并选择了类型 DLL.

1. I have created a win32 project and selected type DLL.

包含头文件并将 .lib 添加到其他依赖项中.

Included header file and added .lib to additional dependencies.

我能够看到静态库中定义的函数(当我按下 ctrl + space 时).

I am able to see the functions defined in the static library (when I press ctrl + space).

作为一个新手，我不知道如何导出函数，即在具有以下签名的 .lib 中:

As a total newbie I do not know how I can export the function, which is, in .lib with following signature:

void testfun( char* inp_buff, unsigned short* inp_len, char* buffer_decomp,unsigned *output_len,unsigned short *errorCode)

我想在动态 DLL 中使用不同名称的相同签名.

I want same signature in my dynamic DLL with a different name.

头文件和.cpp文件要写什么?

What to write in header file and .cpp file?

推荐答案

如果你可以重新编译你的 lib，只需将 __declspec(dllexport) 添加到你想要导出的所有函数的签名中.

If you can recompile your lib, just add __declspec(dllexport) to the signatures of all of the functions you want to be exported.

void __declspec(dllexport) testfun( char* inp_buff, unsigned short* inp_len, char* buffer_decomp,unsigned *output_len,unsigned short *errorCode)

如果你不能这样做，那么你可以通过编写一个 .def 文件来导出它们.使用 def 文件，您甚至可以在导出函数时更改其名称.http://msdn.microsoft.com/en-us/library/28d6s79h.aspx

If you can't do that, then you can export them by writing a .def file instead. Using def files you can even change the name of a function as it is exported. http://msdn.microsoft.com/en-us/library/28d6s79h.aspx

---- mylib.def 的内容----

---- contents of mylib.def ----

LIBRARY

EXPORTS
   testfun
   newname=testfun2

然后当你链接dll时，包含mylib.def

Then when you link the dll, include mylib.def

link /dll /machine:x86 /def:mylib.def  mylib.lib

编辑 2:

请注意 pinvoke 假定您导入的函数将具有 _stdcall 调用约定，除非您另有说明.因此，您可能也需要在 C# 代码中执行此操作.

note that pinvoke assumes that the functions you import will have _stdcall calling convention unless you say otherwise. So you might need to do this as well, in your C# code.

[DllImport("mylib.dll", CallingConvention=CallingConvention.Cdecl)]

或者，您可以将 C++ 代码更改为 __stdcall

Or, you could change your C++ code to be __stdcall

void __declspec(dllexport) __stdcall testfun( char* inp_buff, ...

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