Call getPid to obtain node pid via XMLRPC in C++

edit

"I cannot figure out how to get access to node URIs" - do you know how to do step (2) of what you suggest?

Perfect, thank you.

Could someone please write working template of this working? I get the URI, but the "getPID" call fails:

// Get URI of the node
XmlRpc::XmlRpcValue args, result, payload;
args.setSize(2);
args[0] = "caller_name";
args[1] = "node_name";
ros::master::execute("lookupNode", args, result, payload, true);

// Make new client of node
std::string uri = result[2];
XmlRpc::XmlRpcClient* client =
ros::XMLRPCManager::instance()->getXMLRPCClient(ros::master::getHost(), ros::master::getPort(), uri.c_str());

// Get PID of the node
XmlRpc::XmlRpcValue request, response;
request.setSize(1);
request[0] = "node_name";
client->execute("getPid", request, response);

The client execute call (last line) always returns false, am I missing something here?

Be sure to close the client created by the XmlRpc::XmlRpcClient, since it opens a socket for every client created. In case you run this in loop, you could get "Too many files opened" error or "Error:24" especially in linux. Since for each client a socket is created and sockets are defined as file descriptors in linux. This will be a memory leak. So always close an opened client after processing. Releasing the client connection is recommended.

ros::XMLRPCManager::instance()->releaseXMLRPCClient(xclient);