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.exe 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

 

[Thomas Matthews]

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.exe 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

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

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alt.comp.lang.learn.c-c++ faq:
http://www.raos.demon.uk/acllc-c++/faq.html
Other sites:
http://www.josuttis.com -- C++ STL Library book

 

[Victor Bazarov]

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.exe 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.

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

 

[Tuga]

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.exe 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

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]

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.exe creates an object that I require in the parent
program, Read_Object.exe. Is there a method to communicate between
child and parent?

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::stringstream args;
args << "Build_Object.exe " << x; // feed other stuff in here
int i = system(args.str().c_str());
/* do something with result */
}

//////////////////////
// code for Build_Object.exe:

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

Dylan

}

 

[Evan Carew]

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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

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.exe 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

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