Listing 3: The Chat application main function>
//developed for C/C++ Users Journal by Erik L. Nelson //this code may be used freely with no restrictions on use // Linux: cc *.cpp -o udp -lpthread // Win32: cl *.cpp -o udp.exe (for Microsoft compiler) #include "comm.h" #include <stdio.h> int main(int argc, char *argv[]){ char buf[4096]; short listeningport; short destport; char *desthost; if(argc != 4 || !(listeningport=atoi(argv[1])) || !(destport=atoi(argv[3]))){ printf("Usage: udp [listen port number] [destination machine]" " [destination port]\n"); return 0; } desthost=argv[2]; CComm Comm; if(! Comm.Listen(listeningport)){ printf("Error listening to UDP port\n"); return 0; } while(fgets(buf,sizeof(buf),stdin)){ Comm.SendMsg(buf, strlen(buf),desthost,destport); } // end of while loop return 0; }