Transfering objects between programs

[Daniel Fudge]

I'm trying to call an executable and read an object from it. For sake
of simplicity say it's just the double "x". In my Read_Object.exe
code I can call the program with the following.

i = system ("Build_Object. exe");

Build_Object.ex e creates an object that I require in the parent
program, Read_Object.exe . Is there a method to communicate between
child and parent?
If so, can you point me to it? Currently, I'm communicating via a
file.

Thanks,
Fudge

[Victor Bazarov]

Re: Transfering objects between programs

"Daniel Fudge" <daniel@oddjob. utias.utoronto. ca> wrote...[color=blue]
> I'm trying to call an executable and read an object from it. For sake
> of simplicity say it's just the double "x". In my Read_Object.exe
> code I can call the program with the following.
>
> i = system ("Build_Object. exe");
>
> Build_Object.ex e creates an object that I require in the parent
> program, Read_Object.exe . Is there a method to communicate between
> child and parent?
> If so, can you point me to it? Currently, I'm communicating via a
> file.[/color]

That's the only way available as far as standard C++ is concerned.

Some OSes offer other ways: shared memory, messaging, etc. However,
this has nothing to do with the standard c++ and therefore off-topic.
Ask in a newsgroup for your OS.

V

[Thomas Matthews]

Re: Transfering objects between programs

Daniel Fudge wrote:[color=blue]
> I'm trying to call an executable and read an object from it. For sake
> of simplicity say it's just the double "x". In my Read_Object.exe
> code I can call the program with the following.
>
> i = system ("Build_Object. exe");
>
> Build_Object.ex e creates an object that I require in the parent
> program, Read_Object.exe . Is there a method to communicate between
> child and parent?
> If so, can you point me to it? Currently, I'm communicating via a
> file.
>
> Thanks,
> Fudge[/color]

Transferring data between executables is outside the
domain of the _standard_ C++ language. Issues between
programs is the domain of the operating system. Research
newsgroups that discuss your operating system.

Also search for "pipes", "sockets", "mutexes".

--
Thomas Matthews

C++ newsgroup welcome message:

http://www.slack.net/~shiva/welcome.txt

C++ Faq: http://www.parashift.com/c++-faq-lite
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alt.comp.lang.l earn.c-c++ faq:

http://www.raos.demon.uk/acllc-c++/faq.html

Other sites:
http://www.josuttis.com -- C++ STL Library book

[Tuga]

Re: Transfering objects between programs

"Daniel Fudge" <daniel@oddjob. utias.utoronto. ca> escreveu na mensagem
news:e9cd095f.0 402111216.2f0df c41@posting.goo gle.com...[color=blue]
> I'm trying to call an executable and read an object from it. For sake
> of simplicity say it's just the double "x". In my Read_Object.exe
> code I can call the program with the following.
>
> i = system ("Build_Object. exe");
>
> Build_Object.ex e creates an object that I require in the parent
> program, Read_Object.exe . Is there a method to communicate between
> child and parent?
> If so, can you point me to it? Currently, I'm communicating via a
> file.
>
> Thanks,
> Fudge[/color]

Hi.
If you want communication between applications why don't you communicate by
sockets?
Then you can return everything you want between apps.

[Dylan Nicholson]

Re: Transfering objects between programs

daniel@oddjob.u tias.utoronto.c a (Daniel Fudge) wrote in message news:<e9cd095f. 0402111216.2f0d fc41@posting.go ogle.com>...[color=blue]
> I'm trying to call an executable and read an object from it. For sake
> of simplicity say it's just the double "x". In my Read_Object.exe
> code I can call the program with the following.
>
> i = system ("Build_Object. exe");
>
> Build_Object.ex e creates an object that I require in the parent
> program, Read_Object.exe . Is there a method to communicate between
> child and parent?[/color]

While not strictly part of the C++ standard, it would close to 100%
portable to do this via command-line arguments, although you're still
faced with the problem of converting data to string representations :

void call_exe(double x)
{
std::stringstre am args;
args << "Build_Object.e xe " << x; // feed other stuff in here
int i = system(args.str ().c_str());
/* do something with result */
}

//////////////////////
// code for Build_Object.ex e:

int main(int argc, char* argv[])
{
if (argc > 1)
{
double x = strtof(argv[1], 0);
//
// etc.
}
}

Dylan

}

[Evan Carew]

Re: Transfering objects between programs

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Fudge,

This is nothing but a serialization issue in descise. A place to start
is the C++ FAQ on serialization. That being said, there are several
technologies which can solve this problem which you might have access
to. They include, but are not limited to: UNIX/IP sockets, pipes, RPC,
CORBA, etc.

From my perspective, if you are looking for something simple and quick,
try the RPC method. THis method is available on all UNIXs & is even
available on MS products under the name of DCE RPC.

Evan Carew

Daniel Fudge wrote:[color=blue]
> I'm trying to call an executable and read an object from it. For sake
> of simplicity say it's just the double "x". In my Read_Object.exe
> code I can call the program with the following.
>
> i = system ("Build_Object. exe");
>
> Build_Object.ex e creates an object that I require in the parent
> program, Read_Object.exe . Is there a method to communicate between
> child and parent?
> If so, can you point me to it? Currently, I'm communicating via a
> file.
>
> Thanks,
> Fudge[/color]

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