Re: [Jsbsim-devel] Output sockets

[Tim H. <tim...@or...>]

Lee,

 

Perhaps this will help:

 

We modified the file "FGfdmSocket.cpp" as follows (beginning around line
#64):

 

'=========================================

  if (address.find_first_not_of("0123456789.",0) != address.npos) {

    if ((host = gethostbyname(address.c_str())) == NULL) {

      cout << "Could not get host net address by name..." << endl;

    }

  } else {

                unsigned int addr;

                addr = inet_addr(address.c_str() );

                // MODIFIED to accept xxx.xxx.xxx.xxx ip addresses - Orion
Networking - 20070816

//    if ((host = gethostbyaddr(address.c_str(), address.size(), PF_INET))
== NULL) {

                if ((host = gethostbyaddr((char *) &addr, address.size(),
PF_INET)) == NULL) {

      cout << "Could not get host net address by number..." <<
WSAGetLastError() << endl;

    }

  }

 

  if (host != NULL) {

    cout << "Got host net address..." << endl;

    sckt = socket(AF_INET, SOCK_STREAM, 0);

 

    if (sckt >= 0) {  // successful

      memset(&scktName, 0, sizeof(struct sockaddr_in));

      scktName.sin_family = AF_INET;

      scktName.sin_port = htons(port);

      memcpy(&scktName.sin_addr, host->h_addr_list[0], host->h_length);

      int len = sizeof(struct sockaddr_in);

                // MODIFIED to accept xxx.xxx.xxx.xxx ip addresses - Orion
Networking - 20070816

                  int socketErr=0;

                  socketErr = connect(sckt, (struct sockaddr*)&scktName,
len);

      if (socketErr == 0) {   // successful

        cout << "Successfully connected to socket for output ..." << endl;

        connected = true;

      } else {                // unsuccessful

        cout << "Could not connect to socket for output ..." <<
WSAGetLastError() << endl;

      }

    } else {          // unsuccessful

      cout << "Could not create socket for FDM output, error = " << errno <<
endl;

    }

  }

'=========================================

--

Tim

  _____  

From: jsb...@li...
[mailto:jsb...@li...] On Behalf Of Lee Duke
Sent: Monday, September 24, 2007 9:03 PM
To: JSBSim development issues
Subject: Re: [Jsbsim-devel] Output sockets

 

Jon,

Thanks. I've got the source code for netcat already. I'm just looking for a
way to avoid having to soret around in  it. 

And this way, if someone shares the code with me, everyone will end up with
some good information.

Lee

Jon S. Berndt wrote: 

Does anyone have a simple example of how to capture/connect to a JSBSim
output socket in C++? I've figure out how to interface to the input
socket from a C++ program, but for some reason connecting to the output
socket has eluded me.
 
I can make the connection using Linux system commands---
nc -l localhost 1138
works exactly as what I would like.
 
Thanks for any help you can give me.
 
Lee
    

 
It's been a long time since I've done sockets, but when writing a socket
listening program (as I recall), you're not guaranteed to get a particular
amount of data each time you access the socket. You might also get more than
you are expecting, so you have to keep reading the data until there's no
more there.
 
Hopefully, someone out there can supply a simple listener application. If
not, the source code for netcat can reportedly be found here:
 
(See: http://www.vulnwatch.org/netcat/index.html)
 
http://www.vulnwatch.org/netcat/nc110.tgz
 
Jon
 
 
 
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