得到系统时间(年月日时分秒毫秒)

char *gettime(char *msg)
{
    struct timeb tp;
    struct tm ltime;

    ftime(&tp);

    localtime_r(&tp.time,<ime);

    sprintf(msg,"%04d-%02d-%02d %02d:%02d:%02d.%03d %d",
    ltime.tm_year+1900,
    ltime.tm_mon+1,
    ltime.tm_mday,
    ltime.tm_hour,
    ltime.tm_min,
    ltime.tm_sec,
    tp.millitm,
    ltime.tm_wday);
    return msg;
}