Envoi d'attachement par SMTP

salut tout le monde
voila mon probleme :

- comment mettre des pièces jointes dans un envoi de mail, voila mon code :

Code:

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int sendmail(char *smtp, char *des, char *msg, char *subject)
{
    char exp[] = "moi@toto.fr";
 
    WSADATA wsa;
    WSAStartup(MAKEWORD(2, 2), &wsa);
 
    SOCKET sock = socket(AF_INET, SOCK_STREAM, 0);
 
    struct hostent *serverHostEnt = gethostbyname(smtp);
 
    SOCKADDR_IN sin;
    memcpy(&sin.sin_addr.s_addr, serverHostEnt -> h_addr, serverHostEnt -> h_length);
    sin.sin_family = AF_INET;
    sin.sin_port = htons(25);
 
    connect(sock, (SOCKADDR*) &sin, sizeof(sin));
 
    char request[1024], b[1024];
    sprintf(request, "EHLO client\r\nMAIL FROM:<%s>\r\n", exp);
    send(sock, request, strlen(request), 0);
    recv(sock, b, 1023, 0);
    sprintf(request, "RCPT TO:<%s>\r\n", des);
    send(sock, request, strlen(request), 0);
    recv(sock, b, 1023, 0);
    sprintf(request, "DATA\r\n");
    send(sock, request, strlen(request), 0);
    recv(sock, b, 1023, 0);
    sprintf(request, "From: %s\r\nTo: %s\r\nSubject: %s\r\n%s\r\n.\r\n\r\n", exp, des, subject, msg);
    send(sock, request, strlen(request), 0);
    recv(sock, b, 1023, 0);
    sprintf(request, "Content-type:<%s>\r\n", titi);
    send(sock, request, strlen(request), 0);
    recv(sock, b, 1023, 0);
    sprintf(request, "QUIT\r\n");
    send(sock, request, strlen(request), 0);
    recv(sock, b, 1023, 0);
 
    closesocket(sock);
    WSACleanup();
 
    return 0;
}

si vous avez des liens bien explicites avec des exemples ou des code sources d'exemple

merci beaucoup ++