Learning Network Programming

Matthew Fay

Could anyone point me in the direction of some easy to understand networking tutorials? My goal is to implement a simple pong clone in C++ that could be played over a LAN.

gnolam

Beej's Guide to Network Programming

karistouf

udp protocol for a real time app ( it means that you dont verify that the packet arrived, and so you have a real time app, with not so much delay)

GullRaDriel

These day it does now matter if you use UDP or TCP.
Also, there is a TCP setting for disabling packet ack before new sending. It's TCP_NODELAY option who disable the naggle algorythm.

karistouf

This are very basic example of UDP.;D
Basic but it works....

1//////////////////CLIENT////////////////////////////////////////////////////////
2int init_client_and_send_packet()
3{
4WSADATA wsa;
5WSAStartup(MAKEWORD(2,0),&wsa);
6SOCKADDR_IN sin;
7 
8//define structure
9sin.sin_family=AF_INET;
10sin.sin_addr.s_addr=inet_addr(ip);
11sin.sin_port=htons(port);
12//prepare invoice
13sock=socket(AF_INET,SOCK_DGRAM,0); //init socket with SOCK_DGRAM (thats say we send in UDP)
14bind(sock,(SOCKADDR*)&sin,sizeof(sin)); //structure to socket
15sinsize=sizeof(sin);
16 
17//init of our array buffer[]
18memset(trace_udp,0,sizeof(trace_udp));
19//we do the invoice
20nbrbytessended=sendto(sock,udp_buffer,sizeof(udp_buffer),0,(SOCKADDR*)&sin,sinsize);
21return(0);  
22}
23 
24int close_client()
25{
26   shutdown(sock,2);
27    closesocket(sock);
28 return(0);  
29}

1/*************** RECEIVER****************/
2#include<stdio.h>
3#include<winsock2.h>
4#pragma comment(lib,"ws2_32.lib")
5#define NBMAX_CAR 10
6 
7int main()
8{
9WSADATA wsa;
10WSAStartup(MAKEWORD(2,0),&wsa);
11 
12SOCKET sock;
13SOCKADDR_IN sin;
14 
15 
16//Variables
17int port = 11060; //Ne pas init. si demande au user.
18char buffer[NBMAX_CAR];//Pour stocker les packets à envoyer
19int bytesreceived=0;
20 
21//building structure
22sin.sin_family=AF_INET;
23sin.sin_addr.s_addr=INADDR_ANY;
24sin.sin_port=htons(port);
25 
26//init socket with SOCK_DGRAM (thats say we send in UDP)
27sock=socket(AF_INET,SOCK_DGRAM,0);
28 
29//set active socket to structure
30bind(sock,(SOCKADDR*)&sin,sizeof(sin));
31int sinsize=sizeof(sin);
32int i=0;
33while(1)
34{
35memset(buffer,0,sizeof(buffer));
36bytesreceived=recvfrom(sock,buffer,sizeof(buffer),0,(SOCKADDR*)&sin,&sinsize);
37 
38i++;
39}
40}

Thread #594708. Printed from Allegro.cc

1	//////////////////CLIENT////////////////////////////////////////////////////////
2	int init_client_and_send_packet()
3	{
4	WSADATA wsa;
5	WSAStartup(MAKEWORD(2,0),&wsa);
6	SOCKADDR_IN sin;
7
8	//define structure
9	sin.sin_family=AF_INET;
10	sin.sin_addr.s_addr=inet_addr(ip);
11	sin.sin_port=htons(port);
12	//prepare invoice
13	sock=socket(AF_INET,SOCK_DGRAM,0); //init socket with SOCK_DGRAM (thats say we send in UDP)
14	bind(sock,(SOCKADDR*)&sin,sizeof(sin)); //structure to socket
15	sinsize=sizeof(sin);
16
17	//init of our array buffer[]
18	memset(trace_udp,0,sizeof(trace_udp));
19	//we do the invoice
20	nbrbytessended=sendto(sock,udp_buffer,sizeof(udp_buffer),0,(SOCKADDR*)&sin,sinsize);
21	return(0);
22	}
23
24	int close_client()
25	{
26	shutdown(sock,2);
27	closesocket(sock);
28	return(0);
29	}

1	/************* RECEIVER**************/
2	#include<stdio.h>
3	#include<winsock2.h>
4	#pragma comment(lib,"ws2_32.lib")
5	#define NBMAX_CAR 10
6
7	int main()
8	{
9	WSADATA wsa;
10	WSAStartup(MAKEWORD(2,0),&wsa);
11
12	SOCKET sock;
13	SOCKADDR_IN sin;
14
15
16	//Variables
17	int port = 11060; //Ne pas init. si demande au user.
18	char buffer[NBMAX_CAR];//Pour stocker les packets à envoyer
19	int bytesreceived=0;
20
21	//building structure
22	sin.sin_family=AF_INET;
23	sin.sin_addr.s_addr=INADDR_ANY;
24	sin.sin_port=htons(port);
25
26	//init socket with SOCK_DGRAM (thats say we send in UDP)
27	sock=socket(AF_INET,SOCK_DGRAM,0);
28
29	//set active socket to structure
30	bind(sock,(SOCKADDR*)&sin,sizeof(sin));
31	int sinsize=sizeof(sin);
32	int i=0;
33	while(1)
34	{
35	memset(buffer,0,sizeof(buffer));
36	bytesreceived=recvfrom(sock,buffer,sizeof(buffer),0,(SOCKADDR*)&sin,&sinsize);
37
38	i++;
39	}
40	}