我想用python调用带有复数输入的c编写函数.我尝试使用SWIG生成包装器-但它似乎掉下来了.我认为我需要找出适合在numpy.i中使用的“宏”-但不确定是什么-任何人对此都有任何经验-或其他可以解决此问题的方法?
numpy.i在底部显示了它-尽管已被注释掉.我尝试使用这些宏-但是它们失败了,SWIG抱怨我尝试了以下宏扩展的语法错误:
%numpy_typemaps(complex float, NPY_CFLOAT , int)
%numpy_typemaps(complex double, NPY_CDOUBLE, int)
%numpy_typemaps(complex long double, NPY_CLONGDOUBLE, int)
这些是我的文件:
ComplexNumbers.c
# include <math.h>
# include <complex.h>
double complex returnX(double complex X)
/*
fresnel reflection coefficient rs
*/
{
return X;
}
ComplexNumbers.i:
%{
#define SWIG_FILE_WITH_INIT
%}
%include "numpy.i"
%init %{
import_array();
%}
%module ComplexNumbers
%inline %{
extern double complex returnX(double complex X);
%}
Python:
#!/usr/bin/env python
"""
setup.py file for ComplexNumbers
"""
from distutils.core import setup
from distutils.extension import Extension
import numpy
ComplexNumbers_module = Extension('_ComplexNumbers',
sources=['ComplexNumbers_wrap.c',
'ComplexNumbers.c'],
include_dirs=[numpy.get_include()]
)
setup (name = 'ComplexNumbers',
version = '1.0',
author = "JP Hadden jp.hadden@bristol.ac.uk",
description = """Spectral Interfereometry functions""",
ext_modules = [ComplexNumbers_module],
py_modules = ["ComplexNumbers"],
)
编译器输出错误
C:\MinGW32-xy\bin\gcc.exe -mno-cygwin -mdll -O -Wall -IC:\Python27\lib\site-pack
ages\numpy\core\include -IC:\Python27\include -IC:\Python27\PC -c ComplexNumbers
_wrap.c -o build\temp.win32-2.7\Release\complexnumbers_wrap.o
ComplexNumbers_wrap.c:2975:23: error: expected '=', ',', ';', 'asm' or '__attrib
ute__' before 'returnX'
ComplexNumbers_wrap.c: In function '_wrap_returnX':
ComplexNumbers_wrap.c:2982:18: error: expected '=', ',', ';', 'asm' or '__attrib
ute__' before 'arg1'
ComplexNumbers_wrap.c:2982:18: error: 'arg1' undeclared (first use in this funct
ion)
ComplexNumbers_wrap.c:2982:18: note: each undeclared identifier is reported only
once for each function it appears in
ComplexNumbers_wrap.c:2986:18: error: expected '=', ',', ';', 'asm' or '__attrib
ute__' before 'result'
ComplexNumbers_wrap.c:2986:18: error: 'result' undeclared (first use in this fun
ction)
ComplexNumbers_wrap.c:2997:24: error: expected ')' before 'complex'
ComplexNumbers_wrap.c:2997:24: error: pointer value used where a floating point
value was expected
ComplexNumbers_wrap.c:2997:14: error: invalid type argument of unary '*' (have '
double')
ComplexNumbers_wrap.c:3000:20: error: expected ')' before 'complex'
ComplexNumbers_wrap.c:3000:20: warning: implicit declaration of function 'return
X'
ComplexNumbers_wrap.c:3001:15: error: expected ')' before 'complex'
ComplexNumbers_wrap.c:3001:15: error: expected ')' before 'complex'
ComplexNumbers_wrap.c:3001:15: error: expected ')' before 'complex'
ComplexNumbers_wrap.c:3001:15: error: pointer value used where a floating point
value was expected
ComplexNumbers_wrap.c:3001:15: error: expected ')' before 'complex'
ComplexNumbers_wrap.c:3001:15: error: incompatible type for argument 1 of 'memcp
y'
c:\mingw32-xy\bin\../lib/gcc/mingw32/4.5.2/../../../../include/string.h:38:40: n
ote: expected 'void *' but argument is of type 'double'
error: command 'gcc' failed with exit status 1
解决方法:
我不确定它如何与Numpy交互,但是SWIG当然包括对C99复杂类型的支持.我可以使用以下示例对此进行验证:
%module test
%{
#include <complex.h>
%}
%include <complex.i>
%inline %{
double complex test(double complex X) {
return X;
}
%}
这使用了SWIG complex.i接口.
(请注意,这里%inline用于声明,定义和包装所有内容-方便进行测试,但是对于“真实”代码,我倾向于使用%include).
我在Linux上使用以下命令对此进行了编译:
swig -Wall -python test.i
gcc -std=c99 -Wall -Wextra test_wrap.c -I/usr/include/python2.7 -shared -o _test.so
内置一个警告就很好.完成后,我可以执行以下操作:
LD_LIBRARY_PATH=. python
Python 2.7.3 (default, Aug 1 2012, 05:16:07)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import test
>>> test.test(complex(0,1))
1j
>>> test.test(complex(0,2))
2j
>>> test.test(complex(1,2))
(1+2j)
>>>
似乎正在接受并返回本机Python复杂类型.
我还能够编译以下接口:
%{
#define SWIG_FILE_WITH_INIT
#include <complex.h>
%}
%include <complex.i>
%include <numpy.i>
%init %{
import_array();
%}
%numpy_typemaps(complex float, NPY_CFLOAT , int)
%numpy_typemaps(complex double, NPY_CDOUBLE, int)
%numpy_typemaps(complex long double, NPY_CLONGDOUBLE, int)
%module test
%inline %{
double complex test(double complex X) {
return X;
}
%}
通过添加%include< complex.i> ;,和-std = c99到编译器标志.我认为您可以使用these options之类的东西为distutils设置它.