SDK IP Functions

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On 28/12/2009 at 15:27, xxxxxxxx wrote:

ok, I tried to send a HTTP command thru the established IP connection on standard port 80 but whenever I call GeIpWaitForIncoming, it never returns (passed listener is correctly established before). C4D idles and I can´t do anything anymore.
Do I need this at all? I am not fully sure I understand the listener intention but I thought it was necessary for getting the packages back. Is that so?

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On 29/12/2009 at 07:29, xxxxxxxx wrote:

Sorry for not answering sooner. I'll try to get an example from the developers. Unfortunatly I have no knowledge about the workings of network connections myself so I can't answer directly.

PS. I'll address this asap in the new year. There is no chance for me to solve this over the holidays.

cheers,
Matthias

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On 29/12/2009 at 08:26, xxxxxxxx wrote:

thanks Matthias. Here is example code I wrote which apparently doesn´t work but shows how I thought it would be working. Maybe it helps resolving this faster (or helps others to resolve with us).

LONG ferr = 0;  
  //Öffne IP Verbindung mit Standard Port 80 für HTTP anfragen  
  connection = GeIpOpenOutgoing("www.dpit2.de:80",this->Get(),10,100,FALSE,&ferr); if(!connection) return;  
  if(ferr!=0) GeIpCloseConnection(connection);  
  
  //Sende HTTP Anfrage für index.html  
  const CHAR httpbuf[44] = "GET http://www.dpit2.de/index.html HTTP/1.0";  
  GeIpSendBytes(connection,httpbuf,sizeof(CHAR)*44);  
  
  //Listener um Serverantwort zu erhalten (?? Hmm, macht irgendwie keinen Sinn...)  
  listener = GeIpOpenListener(0,80,this->Get(),1,FALSE,&ferr); if(!listener) return;  
  if(ferr!=0) GeIpCloseConnection(listener);  
  
  //Antwortverbindung (scheint für immer zu idlen...)  
  IpConnection* incoming = GeIpWaitForIncoming(listener,this->Get(),&ferr);  
  GePrint("zurück aus dem Vakuum");  
  //Größe des Antwortbuffers  
  LONG bytes = GeIpBytesInInputBuffer(incoming);  
  
  //Falls da was ist..  
  if(bytes>0)  
  {  
      //Einlesen  
      void* buffer = GeAlloc(bytes);  
      GeIpReadBytes(incoming,buffer,bytes);  
      //dealloziieren des Buffers  
      GeFree(buffer);  
  }  
  //Antwortverbindung kappen  
  GeIpCloseConnection(incoming);  

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On 10/01/2010 at 10:16, xxxxxxxx wrote:

*pushing daisies*

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On 21/01/2010 at 09:00, xxxxxxxx wrote:

Just wanted to check back when you approximately will be able to provide an example. Any chance of a foreseeable point in time?

Thanks

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On 21/01/2010 at 09:39, xxxxxxxx wrote:

Sorry I can not give an estimate.

cheers,
Matthias

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On 21/01/2010 at 11:31, xxxxxxxx wrote:

ok thanks. Then I´ll be waiting...and I will be waiting.

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On 22/01/2010 at 00:56, xxxxxxxx wrote:

With GeIpOpenOutgoing, you try to connect to someone listening.
With GeIpOpenListener you start listening yourself on some port, and when someone trys to connect to you, you get a connection.

Sending data worked fine for me, receiving should too.

I'll include a testserver and a testclient I did a long time ago, the server should display the message sent through:

IpConnection *con;
    con = GeIpOpenOutgoing("127.0.0.1:6000", bt, 10, 100, FALSE, &ferr);
    CHAR buf[7] = "blabla";
    GeIpSendBytes( con, buf, 7 );

on the same connection you can ofcoure also try to receive (wont work with my testserver though, since it doesnt send anything )

btw, it should always be a good idea to escape your sending/receiving buffer with '\0' or '\r\n'

testserver, written in c++:
it listens on port 6000 and accepts any connection, when it receives something it displays it.

#include "stdafx.h"
#include "iostream"
#include "stdio.h"
#include "stdlib.h"
#include "string.h"
#include "windows.h"
#include "winsock2.h"

#define BUF_SIZ 4096

int rcv_Client(SOCKET s) {
  char buf[BUF_SIZ];            // Buffer für empfangene Daten
  int rcvCnt=0;
  // Daten empfangen(blockiert)

while(true){
      rcvCnt=recv(s, buf, sizeof(buf)-1, 0);
      if (rcvCnt<=0) {
          printf("geschlossen");
          break;
      }       
      buf[rcvCnt]='\0';
      printf("empfangen: %s\n", buf);
  }

// Verbindung schließen
  closesocket(s);

return 0;
}

int main() {
  long  result;          // Enthält die Rückgabewerte der Funktionen
  WSADATA wsa;           // Initialisierungs-Daten

// Mit WSAStartup werden die Sockets initialisiert
  result = WSAStartup(MAKEWORD(2, 0), &wsa);
  if(result != 0){
      printf("Fehler bei WSAStartup() : Code %d\n", result);
      return 0;
  }
  else {
      printf("WSAStartup() erfolgreich!\n");
  }

SOCKADDR_IN addrBind;  // Daten für das Binden an einen Port
  // Initialisieren der Struktur SOCKADDR_IN
  memset(&addrBind, 0, sizeof(SOCKADDR_IN));
  addrBind.sin_port            = htons(6000);
  addrBind.sin_family            = AF_INET;
  addrBind.sin_addr.s_addr    = ADDR_ANY;

// Initialisierung des socketAccept
  SOCKET socketAccept=socket(AF_INET, SOCK_STREAM, 0);   // Socket, der Verbindungen annimt
 
  result=bind(socketAccept, (SOCKADDR* ) &addrBind, sizeof(SOCKADDR_IN));
  if(result == SOCKET_ERROR) {
      printf("Fehler in bind() : Code %d\n", WSAGetLastError());
      return 0;
  }
  else {
      printf("bind() erfolgreich!\n");
  }
 
  // socketAccept geht in den "listen-mode"
  result = listen(socketAccept, 10);
  if(result == SOCKET_ERROR) {
      printf("Fehler in listen() : Code %d\n", WSAGetLastError());
      return 0;
  }
  else {
     printf("listen() erfolgreich!\n");
  }

SOCKET socketConnect;  // Socket, der eine Verbindung enthält
  sockaddr_in client;
  int cli_size=sizeof(client);

while(true)
  {
      // accept() blockiert solang, bis eine Verbindung angenommen wurde
      socketConnect = accept(socketAccept, (sockaddr* ) &client, &cli_size);
     
      if(socketConnect == SOCKET_ERROR) {
          printf("Fehler in accept() : Code %dProgramm wird fortgesetzt\n",
                 WSAGetLastError());
          continue;
      }
      else {
          SOCKADDR_IN addrTemp;
          memset(&addrTemp, 0, sizeof(SOCKADDR_IN));
          int len = sizeof(addrTemp);

if (getpeername(socketConnect, (sockaddr* ) &addrTemp, &len) < 0)
              printf("Fehler gepeername()");
          else {
              printf("%s:%d verbunden\n", inet_ntoa(addrTemp.sin_addr), ntohs(addrTemp.sin_port));
          }
          rcv_Client(socketConnect);
      }
  }
}

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On 22/01/2010 at 01:00, xxxxxxxx wrote:

listening for a connection and accepting it should work like this:

first you open a listener, when a client connects, you open a connection to accept (my guess is that this is what GeIpWaitForIncomming is for)
then you try to receive on the accept-connection (the listener keeps listening, or is closed)

something like this:

if ( !conListener )
  {
      conListener = GeIpOpenListener( ( (127 << 24) + (0 << 16) + (0 << + 1 ), 6000, bt, 10, TRUE, &ferr );
      if ( conListener )
      {
          CHAR buf[200];
          GeIpGetHostAddr( conListener, buf, 200 );
          String str = String( buf );
          GePrint( str );
      }
  }
  if ( !conAccept )
      conAccept = GeIpWaitForIncoming( conListener, bt, &ferr );
 
  LONG bytes = GeIpBytesInInputBuffer( conAccept );
  if ( bytes > 0 )
  {
      CHAR buf[200];
      GeIpReadBytes( conAccept, buf, bytes );
 
      String str = String( buf );
      GePrint( str );
  }

the problem is: I never received a thing on "conAccept" (and also didnt on conListener), but the connection could be established, well not really, since doesnt seem to accept it (could be a bug)
-> just see what happens in TCPView (next post) when starting the testclient

and here for the simple client:

start this after opening the listening connection, since it tries to connect to port 6000 right on start
you can then send any kind of data through typing it in and pressing enter.

for further understanding on whats going on, try starting both the testserver and client, they will connect with each other.

#include "stdafx.h"
#include "stdio.h"
#include "stdlib.h"
#include <string>
#include "windows.h"
#include "winsock2.h"
#include "iostream"

int snd_Server(SOCKET s) {
  int sndCnt=0;
  char temp[200];
  std::string msg;
  while (true) {
      std::cin.getline(temp, 100, '\n');
      msg=temp;
      msg+="\r\n";
      sndCnt=send(s, msg.c_str(), msg.length(), 0);
      if(sndCnt<0){
          perror("Fehler Send");
          return 1;
      }
  }
  return 0;
}

int main(int argc, char **argv)
{
  WSADATA wsa;
  int res=WSAStartup(MAKEWORD(2,0), &wsa);
  if(res!=0){
      perror("Fehler WSAStartup");
      return 1;
  }

SOCKADDR_IN addr;
  memset(&addr, 0, sizeof(SOCKADDR_IN));
  addr.sin_port            = htons(6000);
  addr.sin_family            = AF_INET;
  addr.sin_addr.s_addr    = inet_addr("127.0.0.1");
 
  SOCKET socketConnect=socket(AF_INET, SOCK_STREAM, 0);

res=connect(socketConnect, (SOCKADDR* ) &addr, sizeof(addr));

if(res<0) {
      perror("Fehler Connect");
      return 2;
  }

if (snd_Server(socketConnect)>0) return 3;
  return 0;
}

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On 22/01/2010 at 01:04, xxxxxxxx wrote:

you can d/l the binaries here:
http://ul.to/n5dcoz

also a very handy tool to see what programs are having listening or established connections is TCPView rom Sysinternals:
http://technet.microsoft.com/de-de/sysinternals/bb897437.aspx

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On 19/11/2010 at 03:00, xxxxxxxx wrote:

I did some tests, and it seems to work quite straight forward.
You just need a thread for your client and your server, then it should work fine:

void SenderThread::Main(void)
{
     while(!TestBreak())
     {
          LONG ferr=0;
          UCHAR buf[] = "mymessage!\0";
     
          IpConnection* sender=GeIpOpenOutgoing("127.0.0.1:9093", Get(), 100000, 100000, FALSE, &ferr;);
          GeIpSendBytes(sender, buf, 11);
          GeIpCloseConnection(sender);
     }
}

void ReceiverThread::Main()
{
     while(!TestBreak())
     {
          ULONG ip = (127 << 24) + (0 << 16) + (0 << + 1;
          LONG ferr=0;
          IpConnection* listener=GeIpOpenListener(ip, 9093, Get(), 100000, FALSE, &ferr;);
          IpConnection* incoming = GeIpWaitForIncoming(listener, Get(), &ferr;);
          while(GeIpBytesInInputBuffer(incoming) ==0)
               GeSleep(10);
          LONG bufsize = GeIpBytesInInputBuffer(incoming);
          CHAR buf[11];
          GeIpReadBytes(incoming, buf, bufsize);
          GeIpCloseConnection(incoming);
          GeIpCloseConnection(listener);
          GePrint(String(buf));
     }
}

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On 19/11/2010 at 03:49, xxxxxxxx wrote:

affa,

I´m using an external library now but as you can see in my post above I did exactly as you did back then (also in a thread of course) and it didn´t work (even though it is straight forward). Maybe they fixed the behavior in R12. Did you try with R12 or also with previous versions? What is the purpose of your loop btw? Would be strange it works for you while it didn´t work back then. Would be interesting to know what made my code not work even if I don´t need it anymore.

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On 19/11/2010 at 04:48, xxxxxxxx wrote:

I only tried it in R11.5 yet, and there it seems to work quite fine.
The loop is just a remainder of my real code. I stripped it down for this example

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On 19/11/2010 at 05:36, xxxxxxxx wrote:

Hey. Can you get a http request through with it? Or did you only test custom buffer sending (like sending/getting your own stuff onto/from your server)?

thx

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On 21/11/2010 at 22:43, xxxxxxxx wrote:

i only tested sending my own stuff between two Cinema instances

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On 22/11/2010 at 01:47, xxxxxxxx wrote:

Ah ok, I see. Thanks for the info anyway