Sockets en Windows

Estos programas fueron la base de muchos otros

Cliente

Descarga Cliente

Servidor

Descarga Servidor 

Código de Cliente

CSocket* sockClient = NULL;
BOOL aceptar = FALSE;

void CClienDlg::OnButton1(){
    if(sockClient != NULL){
        delete sockClient;
        m_envia = "";
        m_recive = "";
        UpdateData(FALSE);
    }
    
    UpdateData(FALSE);

    sockClient = new CSocket;
    sockClient->Create();
    BOOL resul;
    int contador = 0;
    do{
        contador ++;
        resul = sockClient->Connect("LOCALHOST", 1000);
        if(contador > 3){
            MessageBox("Tiempor de espera superado", "Time Out");
            return;
        }
    }
    
    while(resul == 0);
    aceptar = TRUE;
    char cadena[1000];
    int datos = sockClient->Receive(cadena, 1000);
    cadena[datos] = 0;
    m_receive = cadena;

    //MessageBox(cadena, "Cadena Recibida");
    UpdateData(FALSE);
}

void CClienDlg::OnEnviar(){

    UpdateData(TRUE);
    char cadena[1000] = "";
    if( m_envia.GetLength() == 0 ){
        return;
    }
    strcpy(cadena,(const char*) m_envia);
    
    //MessageBox(m_envia,"Envio");
    sockClient->Send(cadena,strlen(cadena));
    strcpy(cadena,"Se rompio la conexion con el servidor");
    int datos = sockClient->Receive(cadena,1000);
    cadena[datos] = 0;
    m_recive = cadena;
    UpdateData(FALSE);
}

Código del Servidor

// SERVIDOR DE INFORMACION
CSocket sockSrvr; // construct a socket
if(sockSrvr.Create(1000)==0){ 
    MessageBox("No puedo establecer conexion en servidor"); 
}

if(sockSrvr.Listen()==0) {}

CSocket sockRecv;

// establecer el tiempo maximo de resppuesta

DWORD inicio = GetTickCount();

while(sockSrvr.Accept( sockRecv )==0){
    int resul = sockSrvr.GetLastError();
    DWORD actual = GetTickCount();
    
    if(actual > inicio + 10000) {
        MessageBox("Finalizado el tiemp maximo de espera","Time out");
        return;
    }

    char cadena[100];
    sprintf(cadena,"%ld",resul);
    
    //MessageBox(cadena);
    
    switch(resul){
        case WSAEFAULT:
        {
            MessageBox("The lpSockAddrLen argument is too small (less than the size of a SOCKADDR structure)");
            return;
        }

        case WSAEINVAL:
        {
        MessageBox("Listen was not invoked prior to accept");
        return;
        }

        case WSAEWOULDBLOCK:
        {
        MessageBox("The socket is marked as nonblocking and no connections are present to be accepted. ");
        return;
        }

        case WSANOTINITIALISED:
        {
        MessageBox("A successful AfxSocketInit must occur before using this API.");
        return;
        }

        case WSAENETDOWN:
        {
        MessageBox(" The Windows Sockets implementation detected that the network subsystem failed.");
        return;
        }

        case WSAEADDRINUSE:
        {
        MessageBox("The specified address is already in use.");
        return;
        }

        case WSAEINPROGRESS:
        {
        MessageBox("A blocking Windows Sockets call is in progress.");
        return;
        }

        case WSAEISCONN:
        {
        MessageBox(" The socket is already connected.");
        return;
        }

        case WSAEMFILE:
        {
        MessageBox("No more file descriptors are available.");
        return;
        }

        case WSAENOBUFS:
        {
        MessageBox("No buffer space is available. The socket cannot be connected.");
        return;
        }

        case WSAENOTSOCK:
        {
        MessageBox("The descriptor is not a socket.");
        return;
        }

        case WSAEOPNOTSUPP:
        {
        MessageBox("no es soportado");
        return;
        }

        default:
        {
        //MessageBox("Ninguno");
        }
    }
}

char cadena[1000] = "Conexion establecida";

// MessageBox(cadena,"Cadena enviada");

sockRecv.Send(cadena,strlen(cadena));

int conta = 0;

while(strcmp(cadena,"FIN" ) != 0 && conta < 5) {
    conta ++;
    strcpy(cadena,"");
    int datos = sockRecv.Receive(cadena,1000);
    cadena[datos] = 0;

    //MessageBox(cadena,"Cadena Recibida");
    sockRecv.Send(cadena,strlen(cadena));
}

MessageBox("Fin de servidor");