python - 用SWIG包装C/C++库

我有一个正在进行的项目，需要使用Topaz Signature Capture垫。我们的产品当前使用Topaz提供的ActiveX控件来收集网站上的签名，但是我们正在尝试移至由Python驱动的桌面应用程序。 Python将使我们无需太多额外工作即可扩展到多个操作系统。

Topaz提供了一个“C”库(http://www.topazsystems.com/sigpluslibrary.html)以与其设备接口(interface)。我相信我已经确定它实际上是C++(使用类和其他C++构造)。我曾尝试使用SWIG和Cython为Python创建包装器，但运气并不好。

我的SWIG目录结构是这样的:

SigSwig

包括(包含来自Topaz共享C库的所有头文件)

setup.py

SigLib.i

Signature.i

等...

Setup.py

# setup.py
import distutils
from distutils.core import setup, Extension

module = Extension(
                        "_SigLib",
                        ["SigLib.i"],
                        swig_opts=['-c++'],
                        language='c++',
                        library_dirs=['c:\Python27'],
                        libraries=["SigLib", "hid", "LibJpeg", "libtiff", "WINTAB32", "WNTAB32X", "zlib"],
                        extra_options=["SigLib.lib", "hid.lib", "LibJpeg.lib", "libtiff.lib", "WINTAB32.LIB", "WNTAB32X.LIB", "zlib.lib"]
                    )

setup(
      name = "Signature Capture",
      version = "1.0",
      ext_modules = [module]
)

SigLib.i

%module SigLib
%{
#define SIGAPI
#include "Include\SigLib.h"
%}

%include TabletParameters.i
%include TabletInterface.i
%include LCDInterface.i
%include Signature.i

签名

%module Signature
%include "Include\Signature.h"

我很难理解SWIG示例，但是据我所知这应该没问题。 SigLib.i加载到主 header (SigLib.h)中，该 header 包含SIGAPI的声明以及所有主要的include文件。它不包括Signature.h(或其他接口(interface)文件中的任何其他头文件)，因为它不跟随所有头文件。然后它将加载其他接口(interface)文件。 Signature.i和所有其他接口(interface)文件仅包含对要解析的 header 的引用。

我尝试了几种不同的方法，这似乎是迄今为止最好的方法。但是，当我执行setup.py时，出现以下错误:

SigLib_wrap.cpp(3417) : error C2065: 'temp' : undeclared identifier
SigLib_wrap.cpp(3418) : error C2065: 'temp' : undeclared identifier
SigLib_wrap.cpp(3418) : error C2059: syntax error : '*'
SigLib_wrap.cpp(3419) : error C2513: 'TabletParameters' : no variable declared before '='
SigLib_wrap.cpp(3419) : error C2065: 'temp' : undeclared identifier
SigLib_wrap.cpp(3420) : error C2065: 'temp' : undeclared identifier
SigLib_wrap.cpp(3420) : error C2541: 'delete' : cannot delete objects that are not pointers
SigLib_wrap.cpp(3432) : error C2275: 'TabletParameters' : illegal use of this type as an expression c:\users\kevin\downloads\sigpython\include\TabletParameters.h(18) : see declaration of 'TabletParameters'

查看生成的代码，大多数错误包含SIGAPI，如下所示:

SIGAPI * temp;

SIGAPI似乎是#define，它出现在SigLib.h文件中，并用于类定义中，例如:

class SIGAPI Signature

SigLib.h的定义:

#ifdef  SIGLIBDLL
#define SIGAPI  __declspec( dllexport )
#else
#define SIGAPI
#endif

我已经尝试了数小时的Google搜索，以寻求解决方案，但是我没有任何运气。我尚未在SWIG文档中找到任何内容，但老实说，我不确定要查找的内容。

编辑:

除了加载额外的标题之外，Giorgos还建议进行更改。它现在似乎可以生成包含所有所需内容的整个包装文件，但是链接到库时出错。

SigLib.i

%module SigLib
%{
    #include "Include\SigLib.h"
%}


%include <windows.i>
%include "Include\SigLib.h"
%include "Include\SigPoint.h"
%include "Include\SigStroke.h"
%include "Include\TabletParameters.h"
%include "Include\CircularBuffer.h"
%include "Include\SerialIoIF.h"
%include "Include\HidIoIF.h"
%include "Include\UsbIoIF.h"
%include "Include\SocketIoIF.h"
%include "Include\NewSocketIoIF.h"
%include "Include\SimIoIF.h"
%include "Include\ProcessSerialData.h"
%include "Include\CaptureSig.h"
%include "Include\TabletPoint.h"
%include "Include\PointBuffer.h"
%include "Include\TabletInterface.h"
%include "Include\TabletSampleList.h"
%include "Include\SigWindowType.h"
%include "Include\SigFile.h"
%include "Include\md5.h"
%include "Include\Utilities.h"
%include "Include\HotSpot.h"
%include "Include\HotSpotList.h"
%include "Include\BitmapCharacter.h"
%include "Include\CharacterMap.h"
%include "Include\TiffImage.h"
%include "Include\LCDGraphicBitmap.h"
%include "Include\LCDInterface.h"

我做到了，改变了我加载所有内容的方式。现在看来它正在编译，但是我遇到了许多类似以下的链接错误:

SigLib_wrap.obj : error LNK2019: unresolved external symbol "public: int __thiscall TabletInterface::PointsInPointBuffer(void)" (?PointsInPointBuffer@TabletInterface@@QAEHXZ) referenced in function __wrap_TabletInterface_PointsInPointBuffer

SigLib_wrap.obj : error LNK2019: unresolved external symbol "public: void __thiscall TabletInterface::InitProcessInputData(void)" (?InitProcessInputData@TabletInterface@@QAEXXZ) referenced in function __wrap_TabletInterface_InitProcessInputData

SigLib_wrap.obj : error LNK2019: unresolved external symbol "public: void __thiscall TabletInterface::CloseProcessInputData(void)" (?CloseProcessInputData@TabletInterface@@QAEXXZ) referenced in function __wrap_TabletInterface_CloseProcessInputData

我需要针对SigLib.lib和其他一些lib文件进行链接，但是我不确定如何从我拥有的setup.py文件中执行此操作，并且该方法是否甚至适用于Python。

最佳答案

根据SWIG文档的第3.4段:



在任何特定于Windows的声明之前添加%include <windows.i>可能会解决您的问题。