SWIG 在 Windows 中生成 C++ Python3 包装器导致断言 MSVC 2017

Question

使用 SWIG 围绕 C++ 类生成包装器会在运行时导致奇怪的断言：

Assertion failed!

Program: C:\Python37\python37_d.dll

File: c:\_work\4\s\objects\typeobject.c

Line: 3634

Expression: PyTuple_Check(args)

For information on how your program can cause an assertion

failure, see the Visual C++ documentation on asserts

(Press Retry to debug the application - JIT must be enabled)

如果在弹出的对话框上点击忽略，一切似乎都正常。

我创建了一个示例程序来尝试复制问题并遇到了同样的问题：

主程序

#include "testwrapper.h"

#pragma push_macro("slots")

#undef slots

#include "Python.h"

#pragma pop_macro("slots")

#include "SwigModules/generated/swig_runtime.h"

PyObject * ConvertToWrapper(SwigInterface * instance)

{

    swig_type_info * pTypeInfo = SWIG_TypeQuery("SwigInterface *");

    PyObject* obj = SWIG_NewPointerObj(instance, pTypeInfo, 0); <- issue occurs here

    return obj;

}

TestWrapper * wrapper = new TestWrapper();

void TestSwig()

{

  Py_Initialize();

  PyRun_SimpleString("import test_module");

  ConvertToWrapper(wrapper);

  Py_Finalize();

}

int main(int argc, char *argv[])

{

  TestSwig();

  return 0;

}

测试包装器.h

#pragma once

#include "swiginterface.h"

class TestWrapper : public  SwigInterface

{

public:

  TestWrapper(){}

  virtual ~TestWrapper(){}

  virtual void Test();

};

swiginterface.h

#pragma once

class SwigInterface

{

public:

  virtual ~SwigInterface(){}

  virtual void Test() = 0;

};

test_module.i（swig 接口文件）

%module test_module

%{

#include "../swiginterface.h"

%}

%include "../SwigInterface.h"

%inline %{

  SwigInterface * test;

%}

setup_function (python)

from distutils.core import setup, Extension

setup(name="test_module",

      py_modules=['test_module'],

      ext_modules=[Extension("_test_module",

                     ["test_module.i"],

                     extra_compile_args=["-DSWIG_TYPE_TABLE=test_module"],

                     swig_opts=["-c++", "-py3"],

                  )])

Answer 1

或者升级到 SWIG 4.0，它有一个修复。

Answer 2

为了解决这个问题，我需要从 Python3.7 降级到 Python3.6