调用C ++成员函数的C函数-使用C编译器编译C代码 [英] C function calling C++ member function - where the C code is compiled with a C compiler

问题描述

请 ，在以欺骗手段关闭之前，请先阅读问题&看看它为何与众不同（提示：它是C编译器）

PLEASE before closing as dupe, read the question & see why it is different (hint: it's the C compiler)

我已经用Google搜索了，发现了很多关于C函数如何调用C ++成员函数的解释。

I have Googled and found many, many, explanations of how a C function can call a C++ member function.

它们看上去都与这个问题，来自非常高的代表成员。

They all look similar to the accepted answer to this question, from a very high rep member.

它说

在头文件中，放入

extern "C" void* MyClass_create() {
   return new MyClass;
}
extern "C" void MyClass_release(void* myclass) {
   delete static_cast<MyClass*>(myclass);
}
extern "C" void MyClass_sendCommandToSerialDevice(void* myclass, int cmd, int params, int id) {
   static_cast<MyClass*>(myclass)->sendCommandToSerialDevice(cmd,params,id);
}

，然后在C代码中放入

void* myclass = MyClass_create();
MyClass_sendCommandToSerialDevice(myclass,1,2,3);
MyClass_release(myclass);

这似乎很简单，但是我不明白的是，头文件必须参考 MyClass （不要介意 static_cast ），但是我想用C编译器（gcc）编译C代码，而不是C ++编译器（g ++）。

That seems straightforward, but what I don't understand is that the header file is going to have to reference MyClass (never mind that static_cast), but I want to compile my C code with a C compiler (gcc), not a C++ compiler (g++).

它不起作用。如何从用C编译器编译的C代码中调用C ++成员函数？

It won't work. How can I call a C++ member function from C code - which is compiled with a C compiler?

推荐答案

您应该执行以下操作在C ++中：

You should do the following in C++:

在与C兼容的头文件中，例如 interface.h ，写：

In a C-compatible header file, e.g. interface.h, write:

#if defined(__cplusplus)
extern "C" {
#endif

void* MyClass_create();
void MyClass_release(void* myclass);
void MyClass_sendCommandToSerialDevice(void* myclass, int cmd, int params, int id);

#if defined(__cplusplus)
}
#endif

并在源文件中，例如 interface.cpp ，放

and in a source file, e.g. interface.cpp, put

/*extern "C"*/ void* MyClass_create() {
    return new MyClass;
}
/*extern "C"*/ void MyClass_release(void* myclass) {
    delete static_cast<MyClass*>(myclass);
}
/*extern "C"*/ void MyClass_sendCommandToSerialDevice(void* myclass, int cmd, int params, int id) {
    static_cast<MyClass*>(myclass)->sendCommandToSerialDevice(cmd,params,id);
}

现在，将它们作为原始C ++库的一部分或单独编译C ++库。您应该能够在纯C程序中包含上述 .h 文件，并将其链接到库。

Now, compile these either as part of the original C++ library, or a separate C++ library. You should be able to include the above .h file in your pure C programs and link them against the library.

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