Thread: live communication between 2 c++ programs

  1. #1
    Registered User
    Join Date
    Apr 2007

    live communication between 2 c++ programs

    Hi, I am looking for a good, fast method for communication between two c++ programs. I am making a 3D mouse pointer and need to send the three coordinates to another program that presents them graphically. At the moment I am using a file, but opening and closing a little file up to 40 times per second cant be ideal...
    At the moment it looks like this:

    Code to send coordinates in Prog1:

    ofstream fout("c:\\xyz.txt");
    fout << x << " " << y << " " << z;
    fout << flush;
    (x, y, z are doubles)

    Code to recieve coordinates in Prog2:

    ifstream fin("c:\\xyz.txt");
           fin >> X >> Y >> Z;
    Any better ideas?
    My googling before finding this forum suggested me sockets or pipes, but I cant get it working. Any example is welcome!

    /Tomas B

    EDIT: I am using Windows XP and Visual Studio 2005
    Last edited by necksnapper; 04-03-2007 at 07:34 AM.

  2. #2
    Ethernal Noob
    Join Date
    Nov 2001
    I'm not entirely sure but I believe you would use a socket library ify your intention is for two programs to communicate over a network.

  3. #3
    Registered User
    Join Date
    Apr 2007
    no they are running at the same computer, thats why I didnt dig more into the sockets - because I realized it was supposed to be on different computers, but maybe it is possible to use sockets anyway?

  4. #4
    Registered User
    Join Date
    Nov 2006
    yes it is

  5. #5
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    Scroll down to the end, then read about mailslots and pipes.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  6. #6
    Registered User
    Join Date
    May 2006
    Is there any portable way to do this? Maybe its possible with boost?

  7. #7
    Frequently Quite Prolix dwks's Avatar
    Join Date
    Apr 2005

    Seek and ye shall find. quaere et invenies.

    "Simplicity does not precede complexity, but follows it." -- Alan Perlis
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  8. #8
    Registered User
    Join Date
    Mar 2007
    You could also export the symbols from that program so that another pogram can read from it.

    Only problem is I am not entirely sure if a DLL has to be the link between the apps, or if you can do it app to app.

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