从C调用C ++类的成员函数（Visual Studio中） [英] Call C++ class member function from C (Visual Studio)

问题描述

我需要调用从C程序中的C ++成员函数。

我创建的.cpp / .H封装文件在C code，包裹C ++成员函数。

I need to call a C++ member function from a C program.
I created .cpp/.h wrapper files in the C code, wrapping the C++ member functions.

i.e.- wrapper.cpp

i.e.- wrapper.cpp

#include "wrapper.h"

extern "C" {

  void wrap_member1()
  {
    Class::member1();
  }

  void wrap_member2()
  {
    Class::member2();
  }
}

和wrapper.h：

and wrapper.h:

#include <windows.h>
#include <stdio.h>
#include "../C++ class with members I need to call.h" 


extern "C" void wrap_member1();
extern "C" void wrap_member2();

我的问题是，当我complie：

错误C2061：语法错误：标识符类

My problem is when I complie:
error C2061: syntax error : identifier 'Class'

它指向C ++类的.H声明为错误。同样的结果，如果我没有在包装文件....？

It points to the .h declaration of the C++ class as an error. Same result as if I did not have the wrapper files....?

P.S。我也删除从原型的外部C，并在包装​​函数接收到错误：

P.S. I also removed the "extern "C" " from the prototypes and received an error on the wrapper function:

error C2732: linkage specification contradicts earlier specification for 'wrap_member1'

任何意见？

推荐答案

有两个问题：

一，要包括在C头文件中的C ++头文件。这意味着C编译器获得C ++ code。这是什么原因导致您所遇到的错误。作为<一个href=\"http://stackoverflow.com/questions/1479888/call-c-class-member-function-from-c-visual-studio/1479897#1479897\">Reed •科普塞建议，把的#include 在C ++源文件中的C头文件代替。

One, you are including a C++ header file in a C header file. This means the C compiler gets C++ code. This is what causes the error you are experiencing. As Reed Copsey suggests, put the #include in the C++ source file instead of the C header file.

二，你正在使用的externC的C头文件。环绕你的语句在 #IFDEF 这样：

Two, you are using extern "C" in the C header file. Wrap your statement in an #ifdef as such:

#ifdef __cplusplus
extern "C" {
#endif

/* Functions to export to C namespace */

#ifdef __cplusplus
}
#endif

这将允许该文件是为C和C ++。

This will allow the file to be usable for both C and C++.

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