swig,python和wchar_t问题

时间:2011-02-14 18:21:01

标签: python macos swig

我是Python C绑定swig的新手,并且一直试图解决这个问题。我有一个外部C库(Example.c),我想从Python调用。我阅读Swig教程并能够立即生成包装器。现在的问题是,当我调用API时,我得到了这个:

>>> import Example
>>> dir(Example)
['Example_CreateConnection', 'trimmed to fit the screen']
>>> Example.Example_CreateConnection("")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: in method 'Example_CreateConnection', argument 1 of type 'ExampleChar const *'

好像找不到类型ExampleChar。以下是我的swig文件:

%module Example
%{
#include "ExampleSDK.h"
%}

%include "ExampleTypes.h"
%include "ExampleSDK.h"

ExampleTypes.h看起来像这样:

#ifndef ExampleTypes_H
#define ExampleTypes_H

typedef wchar_t ExampleChar;

#endif /* ExampleTypes_H */

ExampleSDK.h如下所示:

#ifndef ExampleSDK_H
#define ExampleSDK_H

#include "ExampleTypes.h"
void Example_CreateConnection(const ExampleChar *temp);

#endif /* ExampleSDK_H */

以下是调用生成包装器的命令行:

swig -python -I. Example.i
gcc -c Example.c -I/Developer/SDKs/MacOSX10.6.sdk/usr/include/
gcc -c Example_wrap.c -I/usr/include/python2.6 -I.
gcc -bundle -flat_namespace -undefined suppress -o _Example.so Example_wrap.o Example.o -L/usr/lib/python2.6/config/ -lpython2.6

以下是Example.c的外观:

#include "runetype.h" // for Mac wchar_t definition

#include "ExampleSDK.h"

void Example_CreateConnection(const ExampleChar *temp)
{
    //do nothing
}

我不确定它有什么问题。我希望有人能够指出我在这里做过的错误。谢谢。

此致

川林

1 个答案:

答案 0 :(得分:2)

上次我将wchat_t用于SWIG + Python时,我最终需要添加以下内容:

%include "pywstrings.swg"
%include "pystrings.swg"
%include "std_string.i"
%include "typemaps.i"  

%fragment("SWIG_AsVal_wchar_t", "header", fragment="<wchar.h>") {
    SWIGINTERN int SWIG_AsVal_wchar_t(PyObject* p, wchar_t* c) {
        return SWIG_OK;
    }
}
%fragment("SWIG_From_wchar_t", "header", fragment="<wchar.h>") {
    SWIGINTERNINLINE PyObject* SWIG_From_wchar_t(wchar_t c) {
        return SWIG_Py_Void();
    }
} 

// Python -> C
%typemap(in) wchar_t const * {
  $1 = PyString_to_wchar_t($input);
}

// C -> Python
%typemap(out) wchar_t * {
  $result = wchar_t_to_PyObject($1);
}

在我的Swig界面文件中。