sockets - server unable to retrieve sender port and IP -

-

setup: 1) laptop connected router in home network. have no-ip domain name. have port-forwarding on router forward port 40000 laptop a. laptop "server" listening on port 40000.

2)i have laptop b connected same router. run "client" on b. creates socket (udp) own port 45000 connects sever (domain name & port 40000) , sending messages. laptop receives. well.

3) when try capture laptop b (sender's) address & port in readmessag(..), gives me ip addressof router (71.xx.yy.zz) , port of 1024. thought give sender ip (whatever 192.x.y.z , port of45000.).

how can connect , exchange messages a-->b ? (i hoping can ip of port of client initial message , reply , establish 2 way communication.) disconnect ? -----i using qt toolkit

//server code excerpt udpsocket = new qudpsocket();  int retbind=udpsocket->bind(qhostaddress::any,40000);  //server reads message client (code checking pending datagrams not shown) udpsocket->readdatagram(datagram.data(), datagram.size(),&senderip, &senderport);

thanks,


Comments

Post a Comment

Popular posts from this blog

c# - How Configure Devart dotConnect for SQLite Code First? -

-
can configure following sample code ? when run following code, error : no entity framework provider found ado.net provider invariant name 'devart.data.sqlite' setting in machine.config <system.data> <dbproviderfactories> <add name="dotconnect sqlite" invariant="devart.data.sqlite" description="devart dotconnect sqlite" type="devart.data.sqlite.sqliteproviderfactory, devart.data.sqlite, version=4.6.287.0, culture=neutral, publickeytoken=09af7300eec23701" /> </dbproviderfactories> </system.data> after add below block code in app.config <?xml version="1.0"?> <configuration>   <configsections> <!-- more information on entity framework configuration, visit http://go.microsoft.com/fwlink/?linkid=237468 --> <section name="entityframework" type="system.data.entity.internal.configfile.entityframeworksection, entit...
Read more

java - Copying object fields -

-
what best way of copying classes when need have 2 independent variables? have simple class: public class myclass { boolean = false; string b= "not empty"; } do need make method : assign(myclass data ) { a= data.a; b= data.b; } is there automatic method copy (duplicate) objects in java? do need make method : pretty close. instead of making method, should make constructor. such constructors called copy constructor , , create them this: myclass(myclass data) { = data.a; b = data.b; } and create copy of instance, use constructor this: myclass obj1 = new myclass(); myclass obj2 = new myclass(obj1); copy constructor can tedious : using copy constructor create deep-copy can tedious, when class has mutable fields. in case, assignment create copy of reference, , not object itself. have create copy of fields (if want deep copy). can go recursive. a better way create deep copy serialize , deserialize object. why not use clone()? ...
Read more

c++ - Clear the memory after returning a vector in a function -

-
i have function processes , stores lot of data in , returns results vector of class. amount of data stored in function tremendous , want clear storage memory of function after finished job. necessary (does function automatically clear memory) or should clear memory function? update: vector<customers> process(char* const *filename, vector<int> id) { vector<customers> list_of_customers; (perform actions) return list_of_customers; } variables defined locally within function automatically released @ end of function scope. destructors objects called, should free memory allocated objects (if objects coded correctly). example of such object std::vector . anything you've allocated new must have corresponding delete release storage. try avoid doing own allocation , use raii instead, i.e. containers or smart pointers.
Read more