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Connecting to a C++ dll

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shanukalra

Connecting to a C++ dll

Hi,

I am new to smalltalk and I have just started using Pharo. I am trying to read a C++ function from a dll and then display output in pharo. I tried using FFI , but I am unable to implement it in this scenario. Can anyone please help me with this?

Regards
Shanu

kilon

Re: Connecting to a C++ dll

here you go

https://gforge.inria.fr/scm/viewvc.php/*checkout*/PharoByExampleTwo-Eng/Alien/alien.pdf?root=pharobooks

I am not expert on these things and the chapter I linked is for C and not C++ but until some expert replies you may have success in trying this

From: Shanu Kalra <[hidden email]>
To: [hidden email]
Sent: Friday, 23 November 2012, 7:16
Subject: [Pharo-users] Connecting to a C++ dll

Igor Stasenko

Re: Connecting to a C++ dll

C++ and FFI = Forget It

just google for it.. you will see that literally no single language
which fully supports it..
most of things require a lot of extra non-trivial steps and not always working..

On 23 November 2012 09:27, dimitris chloupis <[hidden email]> wrote:

>
> here you go
>
> https://gforge.inria.fr/scm/viewvc.php/*checkout*/PharoByExampleTwo-Eng/Alien/alien.pdf?root=pharobooks
>
> I am not expert on these things and the chapter I linked is for C and not
> C++ but until some expert replies you may have success in trying this
> ________________________________
> From: Shanu Kalra <[hidden email]>
> To: [hidden email]
> Sent: Friday, 23 November 2012, 7:16
> Subject: [Pharo-users] Connecting to a C++ dll
>
> Hi,
>
> I am new to smalltalk and I have just started using Pharo. I am trying to
> read a C++ function from a dll and then display output in pharo. I tried
> using FFI , but I am unable to implement it in this scenario. Can anyone
> please help me with this?
>
> Regards
> Shanu
>
>

--
Best regards,
Igor Stasenko.

shanukalra

Re: Connecting to a C++ dll

Is it possible if I use NativeBoost? And if possible can you please tell me exactly how to call an external function from a dll and display the ouput in pharo.

Thanks
Shanu

EstebanLM

Re: Connecting to a C++ dll

no, it is not possible, since NativeBoost is "a kind of FFI" after all... and the problem is not with ffi libraries but with c++ (lack of) standards

On Nov 28, 2012, at 1:25 PM, shanukalra <[hidden email]> wrote:

> Is it possible if I use NativeBoost? And if possible can you please tell me
> exactly how to call an external function from a dll and display the ouput in
> pharo.
>
> Thanks
> Shanu
>
>
>
> --
> View this message in context: http://forum.world.st/Connecting-to-a-C-dll-tp4656451p4657114.html
> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.
>

EstebanLM

Re: Connecting to a C++ dll

btw, I don't know what are you trying to do, but some c++ libraries provides an "ffi capable" extra library, to handle this kind of issues.

On Nov 28, 2012, at 1:31 PM, Esteban Lorenzano <[hidden email]> wrote:

> no, it is not possible, since NativeBoost is "a kind of FFI" after all... and the problem is not with ffi libraries but with c++ (lack of) standards
>
> On Nov 28, 2012, at 1:25 PM, shanukalra <[hidden email]> wrote:
>
>> Is it possible if I use NativeBoost? And if possible can you please tell me
>> exactly how to call an external function from a dll and display the ouput in
>> pharo.
>>
>> Thanks
>> Shanu
>>
>>
>>
>> --
>> View this message in context: http://forum.world.st/Connecting-to-a-C-dll-tp4656451p4657114.html
>> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.
>>
>

melkyades

Re: Connecting to a C++ dll

Just one thing, so that he doesn't lose hope so fast. Maybe if he explains a bit of the context there's a better solution. Can you say what library you want to bind?

About binding C++, IF it's in a DLL, I wouldn't say that it's plain impossible, but that it depends mainly on how the dll is generated, as there are different degrees of compatibility between C++ and DLLs. As nativeboost let's you generate custom assembly, in theory it may be possible but in practice might be hard, you should be warned, and will require some low-level programming abilities.

My first question is if you are sure it's a C++ dll and not a plain C one?

You may want to read this to understand what you are dealing with first.

Cheers,

Javier

On Wed, Nov 28, 2012 at 9:33 AM, Esteban Lorenzano <[hidden email]> wrote:

btw, I don't know what are you trying to do, but some c++ libraries provides an "ffi capable" extra library, to handle this kind of issues.

On Nov 28, 2012, at 1:31 PM, Esteban Lorenzano <[hidden email]> wrote:

> no, it is not possible, since NativeBoost is "a kind of FFI" after all... and the problem is not with ffi libraries but with c++ (lack of) standards
>
> On Nov 28, 2012, at 1:25 PM, shanukalra <[hidden email]> wrote:
>
>> Is it possible if I use NativeBoost? And if possible can you please tell me
>> exactly how to call an external function from a dll and display the ouput in
>> pharo.
>>
>> Thanks
>> Shanu
>>
>>
>>
>> --
>> View this message in context: http://forum.world.st/Connecting-to-a-C-dll-tp4656451p4657114.html
>> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.
>>
>

--
Lic. Javier Pimás
Ciudad de Buenos Aires

Igor Stasenko

Re: Connecting to a C++ dll

On 28 November 2012 18:20, Javier Pimás <[hidden email]> wrote:
> Just one thing, so that he doesn't lose hope so fast.
:)

> Maybe if he explains a
> bit of the context there's a better solution. Can you say what library you
> want to bind?
>

> About binding C++, IF it's in a DLL, I wouldn't say that it's plain
> impossible, but that it depends mainly on how the dll is generated, as there
> are different degrees of compatibility between C++ and DLLs. As nativeboost
> let's you generate custom assembly, in theory it may be possible but in
> practice might be hard, you should be warned, and will require some
> low-level programming abilities.
>
> My first question is if you are sure it's a C++ dll and not a plain C one?
>
> You may want to read this to understand what you are dealing with first.
>

yes, your link is a nice description of a problem..
it shows that even connecting two different C/C++ modules, possibly
compiled by different compilers, can be problematic.. Not saying about
connecting C++ module with any other language.

>
> Cheers,
> Javier
>

--
Best regards,
Igor Stasenko.