[Python.NET] Use of c++ dll in python

[Mark McMahon]

Hi Lalit,


import ctypes

(or maybe windll instead of cdll below)
ctypes.cdll.YourDllName.InitDialogFromFile("InitFromThisFile.txt")

Simple, no? :-)

For anything more complex - please look at the ctypes help. 
Ctypes helps you a lot - but there is no substitute for reading the help or googling around the 'net for some examples.

Mark

-----Original Message-----
From: Lalit DIGARI [mailto:lalit.digari at st.com] 
Sent: Tuesday, April 04, 2006 12:37 AM
To: Mark McMahon
Cc: pythondotnet at python.org
Subject: RE: [Python.NET] Use of c++ dll in python

Thanks mark,
How could I use dll's exposed function with in python script?
Reagrd's
lalit

-----Original Message-----
From: Mark McMahon [mailto:mark.mcmahon at eur.autodesk.com] 
Sent: Monday, April 03, 2006 5:41 PM
To: Lalit DIGARI; pythondotnet at python.org
Subject: RE: [Python.NET] Use of c++ dll in python


Hi Lalit,

This is not really the group to ask this question - as it doesn't have
anything to do with python.NET.

But other then that I can answer your question I think :-)

You say a "C++ DLL". First thing is you need to make sure that your
functions are correctly exported in an 'unmangled' form. 

What I do for this is the following:

// create a macro DLLEXPORT for those methods you want to export
#define  DLLEXPORT   extern "C" __declspec(dllexport)

// the following may be optional - but can make things easier
#define  VB 	__stdcall

// add the macro to your function prototypes
DLLEXPORT int VB InitDialogFromFile   (char const *const fileName);

// in the CPP file define your function as you would normally do int VB
InitDialogFromFile(char const * const fileName) {
	//FUNC BODY
}

You may also need to create a .def file

; Declares the module parameters for the DLL.
NAME MyCPPDll.dll
DESCRIPTION  'Description of your DLL'
EXPORTS
	// the following line can be used to rename exports
	//InitDialogFromFile_renamed = InitDialogFromFile
	InitDialogFromFile

Once you add that to the project - it will make sure that no mangling
happens (sometimes even after doing extern "C" you still get a leading
underscore!)

Mark


-----Original Message-----
From: pythondotnet-bounces at python.org
[mailto:pythondotnet-bounces at python.org] On Behalf Of Lalit DIGARI
Sent: Monday, April 03, 2006 7:22 AM
To: pythondotnet at python.org
Subject: [Python.NET] Use of c++ dll in python

Hello All ,
I have devloped a c++ dll named mydll in c++ how can I access it with in
python script using ctype... Regard's Lalit

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