www.pudn.com > MUD.rar > Demo02-02.cpp

// MUD Programming 
// Ron Penton 
// (C)2003 
// Demo02-02.cpp - Hello Internet! Client 
// This program will start connect to a server, and send a string of data to it 
 
 
 
// Code Block 2.1 - Header Includes 
// This code block includes all of the standard Sockets API/Winsock headers 
#ifdef WIN32                // windows 95 and above 
    #include "winsock2.h" 
    #include "Ws2tcpip.h" 
 
#else                       // UNIX/Linux 
    #include  
    #include  
    #include  
    #include  
    #include  
    #include  
#endif 
// End Code Block 2.1 - Header Includes 
    
 
 
// Code Block 2.2 - Redefinitions and globals For Cross-Compatibility 
#ifdef WIN32                // windows 95 and above 
    WSADATA g_wsadata;      // winsock data holder 
    #define CloseSocket closesocket 
    #define GetSocketError WSAGetLastError 
    #define StartSocketLib WSAStartup( MAKEWORD( 2, 2 ), &g_wsadata ); 
    #define CloseSocketLib WSACleanup(); 
 
    #ifndef socklen_t 
        typedef int socklen_t; 
    #endif 
#else                       // Unix/Linux 
    #define CloseSocket close 
    #define GetSocketError errno 
    #define StartSocketLib {} 
    #define CloseSocketLib {} 
#endif 
 
// End Code Block 2.2 - Redefinitions and globals For Cross-Compatibility 
 
 
 
#include              // load the iostream library 
#include  
using namespace std;            // use the std namespace 
 
int main() 
{ 
    // BEGIN CODE BLOCK 2.4 - creating a connecting data socket 
    int err;                    // for getting errors 
    char message[128] = "Hello Internet!"; 
    char ip[16] = ""; 
    unsigned long ipaddr; 
 
    // start the socket library 
    StartSocketLib; 
 
    cout << "Enter the IP address to connect to: "; 
    cin >> ip; 
 
    // convert the IP address. 
    ipaddr = inet_addr( ip ); 
    if( ipaddr == -1 ) 
    { 
        cout << "Error: invalid IP address" << endl; 
        return 0; 
    } 
 
    // create a socket 
    int sock = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP ); 
 
    // check if socket was created 
    if( sock == -1 ) 
    { 
        cout << "Socket creation error!" << endl; 
        return 0; 
    } 
    cout << "Socket created!" << endl; 
 
    // create a sockaddr_in for connection, on port 4000 
    struct sockaddr_in socketaddress; 
    socklen_t sa_size = sizeof( struct sockaddr_in ); 
    socketaddress.sin_family = AF_INET; 
    socketaddress.sin_port = htons( 4000 ); 
    socketaddress.sin_addr.s_addr = ipaddr; 
    memset( &(socketaddress.sin_zero), 0, 8 ); 
 
    // connect the socket 
    err = connect( sock, (struct sockaddr*)&socketaddress, sa_size ); 
 
    if( err == -1 ) 
    { 
        cout << "Socket connection error!" << endl; 
        return 0; 
    } 
    cout << "Socket connected!" << endl; 
    // END CODE BLOCK 2.4 - creating a connecting data socket 
 
    cout << "sending message: " << message << "..." << endl; 
 
    // send data 
    err = send( sock, message, strlen( message ) + 1, 0 ); 
 
    if( err == -1 ) 
    { 
        cout << "Socket sending error!" << endl; 
        return 0; 
    } 
 
    cout << "Data Sent!" << endl; 
     
    shutdown( sock, 2 ); 
    CloseSocket( sock ); 
 
    CloseSocketLib; 
}