BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  socket issue          BorlandTalk.com Forum Index -> C++ Builder (Internet Socket) View previous topic :: View next topic   Author Message mat Guest Posted: Fri Feb 09, 2007 8:09 am    Post subject: socket issue hello,im using a socketconnection component to connect to a datasnap server.i do socketconnection->connected=true; the code is in a separate thread and i have some application->processmessages in order to get some visual feedback (e.g. a messagebox before it starts connected and a messagebox if it connects). the code is of course in a try catch . the issue is the following: when i try to connect to an existing pc it does what its supposed to do almost immediately, if the datasnap server is up it connects ,if its not up (e.g. if im not running the scktsrv.exe)it throws an exception. when i try to connect to an not existing pc (wrong ip) the system freezes and waits for a rather big timeout. if i try to connect to a firewalled pc (which blocks such incomming) it freezes again and waits for a rather big timeout again. is this something i can fix?the waiting timeout is very big,and the program freezes (although its in its own thread). i thought of first pinging the remote pc to see if its up and then try to connect to it but that would introduce another waiting time(the ping waiting time) what do people usually do to deal with this kind of problems? thks Back to top Bob Gonder Guest Posted: Fri Feb 09, 2007 11:48 pm    Post subject: Re: socket issue mat wrote: Quote: hello,im using a socketconnection component to connect to a I would point you to Remy's previous answer: From: "Remy Lebeau \(TeamB\)" Newsgroups: borland.public.cppbuilder.internet.socket Subject: Re: socketconnection-thread issue Date: Wed, 10 Jan 2007 00:23:36 -0800 Message-ID: <45a4a254$1 (AT) newsgroups (DOT) borland.com> Google it or click the Message-ID Back to top Remy Lebeau (TeamB) Guest Posted: Sat Feb 10, 2007 12:35 am    Post subject: Re: socket issue "mat" <mat (AT) hotmail (DOT) com> wrote in message news:45cbd7c8$1 (AT) newsgroups (DOT) borland.com... Quote: hello,im using a socketconnection component Which component specifically? Quote: the code is in a separate thread and i have some application->processmessages in order to get some visual feedback (e.g. a messagebox before it starts connected and a messagebox if it connects). You should not be calling Application->ProcessMessages() in a worker thread. Only call it in the main thread. Besides, you don't need it anyway. You can call the Win32 API MessageBox() directly in a worker thread without processing any messages at all, as it has its own message processing internally. Quote: if its not up (e.g. if im not running the scktsrv.exe)it throws an exception. As it should be. Quote: when i try to connect to an not existing pc (wrong ip) the system freezes and waits for a rather big timeout. Again, as it should be. If the IP cannot be reached immediately, it can take a long time for the OS to figure out whether the IP is actually valid or not. Quote: if i try to connect to a firewalled pc (which blocks such incomming) it freezes again and waits for a rather big timeout again. See above. If the firewall is blocking communications, then it is likely also blocking the packets that the OS needs to determine whether the machine is present or not at the IP. Quote: is this something i can fix? The only thing you can do is implement your own timeout on the connection manually. You did not say whether the socket was asynchronous or synchronous. It makes a big difference in how to implement such a timeout. Quote: the waiting timeout is very big Such is the nature of sockets, especially on Windows. Microsoft likes to use large timeouts that cannot be changed. Quote: the program freezes (although its in its own thread). The program cannot be freezing unless you are making your main thread wait on the socket thread while it is waiting on the socket. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Sat Feb 10, 2007 12:37 am    Post subject: Re: socket issue "Bob Gonder" <notbg (AT) notmindspring (DOT) invalid> wrote in message news:2ocps2hvm5nhgo61mg0mffnafc1e5uohcl (AT) 4ax (DOT) com... Quote: I would point you to Remy's previous answer: http://groups.google.com/group/borland.public.cppbuilder.internet.socket/msg/e59802701e88334c Gambit Back to top mat Guest Posted: Sat Feb 10, 2007 11:41 pm    Post subject: Re: socket issue im using the tscoketconnection component from the datasnap tool categorie to connect to a datasnap server(builder 2006). Quote: You should not be calling Application->ProcessMessages() in a worker thread. but if i dont call this in the thread when i want to show something in a label in the main thread(form) then it doesnt show up,eg:(all this in my separate thread): MainForm->Label1->Caption="connecting..."; Application->ProcessMessages(); DataModule->SocketConnection1->Connected=true; if i dont put the processmessages it doesnt show the label. concerning the sychronous-asychronous mode,i dont know how to change this in the component im using. maybe im using the thread in a wrong way in the first place.i have created a thread to do the connecting but this new thread accesses a component(socket connection)from a datamodule.is this the reason that it forces the program to freeze? eg: Mythread::Connect() { DataModule->SocketConnection->Connected=true; } Back to top Remy Lebeau (TeamB) Guest Posted: Mon Feb 12, 2007 3:36 am    Post subject: Re: socket issue "mat" <mat (AT) hotmail (DOT) com> wrote in message news:45ce03ae$1 (AT) newsgroups (DOT) borland.com... Quote: if i dont call this in the thread when i want to show something in a label in the main thread(form) then it doesnt show up You are not supposed to be updating the controls of the main thread from within the context of a worker thread to begin with. For a worker thread to safely access the UI, it should be using the TThread::Synchronize() method for that. This is clearly stated at the top of every unit that the IDE generates when you choose the "File | New | Thread" wizard. For example: void __fastcall TWorkerThread::Execute() { //... Synchronize(UpdateUI); //... } void __fastcall TWorkerThread::UpdateUI() { MainForm->Label1->Caption = "connecting..."; DataModule->SocketConnection1->Connected = true; } Quote: concerning the sychronous-asychronous mode,i dont know how to change this in the component im using. You still haven't said which component you are actually using. I asked you that question in my last reply. Quote: i have created a thread to do the connecting but this new thread accesses a component(socket connection)from a datamodule.is this the reason that it forces the program to freeze? No. Gambit Back to top mat Guest Posted: Mon Feb 12, 2007 6:44 am    Post subject: Re: socket issue Thks about the answers,i said that im using the tscoketconnection component from the datasnap tool categorie this tool categories has: tdcomconnection tsocketconnection tsimpleobjectbroker etc.. Back to top mat Guest Posted: Mon Feb 12, 2007 7:09 am    Post subject: Re: socket issue void __fastcall TAuthThread::Connect() { AuthDataModule->SocketConnection1->Connected=true; } void __fastcall TAuthThread::MyFUNCTION() { //do something Synchronize(Connect); } this produces error:could not find a match for tthread:synchronize(void) i guess i wrote it wrong,how must i fix this? i checked this->connect() but creates the same error Back to top Remy Lebeau (TeamB) Guest Posted: Mon Feb 12, 2007 8:50 am    Post subject: Re: socket issue "mat" <mat (AT) hotmail (DOT) com> wrote in message news:45cfbe36$1 (AT) newsgroups (DOT) borland.com... Quote: this produces error:could not find a match for tthread:synchronize(void) I assume, then, that you are using BDS 2006? Always say the version you are using when asking for help. You will have to prefix the method name with '&' when calling Synchronize(), ie: Synchronize(&Connect); Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Mon Feb 12, 2007 9:10 am    Post subject: Re: socket issue "mat" <mat (AT) hotmail (DOT) com> wrote in message news:45cfe6b7 (AT) newsgroups (DOT) borland.com... Quote: i tryed that but again when i try to connect to a non existing ip the program freezes This time I would expect it to, as you are now connecting in the context of the main thread. You weren't doing that before. Quote: concerning the aychronous-sychronous mode is there anything that i can do? No. TSocketConnection is a synchronous component. Gambit Back to top mat Guest Posted: Mon Feb 12, 2007 9:10 am    Post subject: Re: socket issue i tryed that but again when i try to connect to a non existing ip the program freezes concerning the aychronous-sychronous mode is there anything that i can do? im using the tscoketconnection component from the datasnap tool categorie borland 2006 thks Back to top mat Guest Posted: Mon Feb 12, 2007 9:10 am    Post subject: Re: socket issue so i guess nothing can be done?any suggestion? :) thks "Remy Lebeau (TeamB)" <no.spam (AT) no (DOT) spam.com> wrote in message news:45cfefd8$1 (AT) newsgroups (DOT) borland.com... Quote: "mat" <mat (AT) hotmail (DOT) com> wrote in message news:45cfe6b7 (AT) newsgroups (DOT) borland.com... i tryed that but again when i try to connect to a non existing ip the program freezes This time I would expect it to, as you are now connecting in the context of the main thread. You weren't doing that before. concerning the aychronous-sychronous mode is there anything that i can do? No. TSocketConnection is a synchronous component. Gambit Back to top mat Guest Posted: Mon Feb 12, 2007 9:10 am    Post subject: Re: socket issue if i try to ping the pc before connecting will it be a good idea? i put an IdIcmpClient component i write simple: AnsiString buffer; unsigned short a; IdIcmpClient1->Ping(buffer,a); Application->ProcessMessages(); and in its onreply even i have Memo1->Lines->Add(AnsiString(AReplyStatus.MsRoundTripTime) +" from "+AReplyStatus.FromIpAddress); i noticed that if i try ping an ip that possible doesnt exist i get a 1000+ from 0.0.0.0 or if i write a url that doesnt exist i get an exception in the timeout that i have declared. is this a good (i mean programming way good) way to understand if an ip exists before making the socketconnection->connected=true? thks "mat" <mat (AT) hotmail (DOT) com> wrote in message news:45cbd7c8$1 (AT) newsgroups (DOT) borland.com... Quote: hello,im using a socketconnection component to connect to a datasnap server.i do socketconnection->connected=true; the code is in a separate thread and i have some application->processmessages in order to get some visual feedback (e.g. a messagebox before it starts connected and a messagebox if it connects). the code is of course in a try catch . the issue is the following: when i try to connect to an existing pc it does what its supposed to do almost immediately, if the datasnap server is up it connects ,if its not up (e.g. if im not running the scktsrv.exe)it throws an exception. when i try to connect to an not existing pc (wrong ip) the system freezes and waits for a rather big timeout. if i try to connect to a firewalled pc (which blocks such incomming) it freezes again and waits for a rather big timeout again. is this something i can fix?the waiting timeout is very big,and the program freezes (although its in its own thread). i thought of first pinging the remote pc to see if its up and then try to connect to it but that would introduce another waiting time(the ping waiting time) what do people usually do to deal with this kind of problems? thks Back to top Remy Lebeau (TeamB) Guest Posted: Mon Feb 12, 2007 9:10 am    Post subject: Re: socket issue "mat" <mat (AT) hotmail (DOT) com> wrote in message news:45d00321 (AT) newsgroups (DOT) borland.com... Quote: if i try to ping the pc before connecting will it be a good idea? No. Asside from the added overhead of the ping itself, that still won't tell you whether the server can actually be connected to or not. Quote: in its onreply even i have Memo1->Lines->Add(AnsiString(AReplyStatus.MsRoundTripTime) +" from "+AReplyStatus.FromIpAddress); i noticed that if i try ping an ip that possible doesnt exist i get a 1000+ from 0.0.0.0 The correct thing to do is to first look at the AReplyStatus.ReplyStatusType member, as that tells you whether the ping was successful or not. The rest of the members may or may not be valid, depending on the type of reply received. 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