将C ++函数导入Python程序 [英] Import C++ function into Python program

问题描述

我现在正在试验python函数。我已经找到一种方法来将python函数导入到c / c ++代码中，但是没有其他方法。

I'm experimenting with python functions right now. I've found a way to import python functions into c/c++ code, but not the other way around.

我有一个c ++程序，它有一个特定的函数在里面。我想将编译好的c ++程序导入到我的python脚本并调用c ++函数。

I have a c++ program written and it has a certain function in it. I'd like to "import" the compiled c++ program into my python script and call the c++ function.

为简单起见，说c ++函数很简单： / p>

For simplicity, say the c++ function is as simple as:

int square(x)
{
  return x*x;
}

，编译程序命名为Cprog。

and the compiled program is named Cprog.

我想要我的python脚本是：

I'd like my python script to be something like:

import Cprog

print Cprog.square(4)

我在互联网上搜索没有效果，我希望你的一个大师可能有一个聪明的方式去这个...

Is this possible? I've searched the internet to no avail and I'm hoping one of you gurus might have a clever way of going about this...

推荐答案

这里是上面简单示例的一些工作完成。虽然线程很老，我认为对初学者有一个简单的全包指南是有帮助的，因为我之前也有一些问题。

Here is a little working completion of the simple example above. Although the thread is old, I think it is helpful to have a simple all-embracing guide for beginners, because I also had some problems before.

function.cpp content externC使用ctypes模块可以处理函数）：

function.cpp content (extern "C" used so that ctypes module can handle the function):

extern "C" int square(int x)
{
  return x*x;
}

wrapper.py内容：

wrapper.py content:

import ctypes
print ctypes.windll.library.square(4) # windows
print ctypes.CDLL('library.so').square(4) # linux or when mingw used on windows

然后编译function.cpp文件例如）：

Then compile the function.cpp file (by using mingw for example):

g++ -shared -c -fPIC function.cpp -o function.o

然后使用以下命令创建共享对象库（注意：不是空白）：

Then create the shared object library with the following command (note: not everywhere are blanks):

g++ -shared -Wl,-soname,library.so -o library.so function.o

然后运行wrapper.py程序应该工作。

Then run the wrapper.py an the program should work.

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