[英]C-DLL from C++ source
I have a C-Wrapper for my C++ Framework. 我的C ++框架有一个C-Wrapper。 Since this should run on mac and windows I am using scons :
由于这应该在mac和Windows上运行,因此我正在使用scons :
env = Environment()
env.Append(CPPPATH = ['./'])
env.Append(LIBS = 'kernel32.lib')
env.Append(LIBPATH = 'C:/Program Files/Microsoft SDKs/Windows/v6.0A/Lib')
env.SharedLibrary(target='warpLib', source='warplib.cpp')
Simple Versions of warplib.cpp and warplib.h look like this: warplib.cpp和warplib.h的简单版本如下所示:
warplib.cpp warplib.cpp
#define DllExport __declspec( dllexport )
#include "warplib.h"
extern "C" {
DllExport int foo(int a) {
return a;
}
}
warplib.h warplib.h
#define DllExport __declspec( dllexport )
extern "C" {
DllExport int foo(int a);
}
Can anybody tell me what is wrong with that? 谁能告诉我这是怎么回事? I tried almost all the combinations possible of 'extern "C"' but it always throws me something like "error C2732: linkage specification contradicts earlier specification for '...'".
我尝试了几乎所有可能使用'extern“ C”的组合,但是它总是使我感到类似“错误C2732:链接规范与早期的'...'规范矛盾”。
If I skip 'extern "C"' it works but I see no .lib file and I am pretty sure I need that to really use the library. 如果我跳过'extern“ C”,它可以工作,但是看不到.lib文件,我很确定我需要它才能真正使用该库。
You should only need extern "C"
on the declaration. 您只需要在声明中使用
extern "C"
。 Anyone then including that header will expect to link against it using the C linking standard, rather than the C++ decorated form. 然后包括该标头的任何人都将期望使用C链接标准而不是C ++装饰的形式针对它进行链接。 The
warplib.cpp
source file, and subsequent object file will expose the function foo
correctly if warplib.h
is included. 所述
warplib.cpp
源文件,和随后的对象文件将暴露函数foo
正确如果warplib.h
是包括在内。
When using MSVC, there are a plethora of semi-useful scripts, and "build environment" console shortcuts provided, with a lot of dev-related environment variables and paths provided. 使用MSVC时,有大量半有用的脚本,并提供了“构建环境”控制台快捷方式,并提供了许多与开发相关的环境变量和路径。 I recommend locating a suitable script to execute to insert these variables into your environment, or running the dev console.
我建议找到合适的脚本来执行以将这些变量插入您的环境中,或者运行开发控制台。
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