metamax's questions

I don't know if the title is appropriate because more than an error I have a strange behavior in my NodeJs application with express and Postgresql

To begin with, I insert my DB into a field called date of the timestamp type in the following way:

var newDate = new Date();
// agrego 5 minutos a la fecha y hora actuales
newDate.setMinutes(newDate.getMinutes() + 5);
// convierto a string el resultado
var string_newDate = newDate.toISOString().replace(/T/, ' ').replace(/\..+/, '')
console.log('tipo:', typeof(string_newDate), ', valor:',string_newDate);
//: tipo: string  valor: 2020-12-14 20:17:53
// guardo en la DB:
database.query('INSERT INTO usuario(fecha) VALUES ($1)', [string_newDate])

When doing a query to the DB by terminal it shows me exactly that value:

Select fecha from usuario where id = 1;
// obtengo: 2020-12-14 20:17:53

The problem arises when I make the query from my nodejs application:

const result = await database.query('SELECT fecha from usuario where id = 1');
...
console.log('tipo:', typeof(result.rows.fecha), 'valor:', typeof(result.rows.fecha))
// obtengo esta fecha:
// tipo: object valor: 2020-12-15T01:17:53.000Z

The date I get when doing the query with nodejs is 2020-12-15T01:17:53.000Z not what I have stored in my database which is 2020-12-14 20:17:53 .

As additional data, no matter what date I save, the date I get when doing the query with nodejs is 5 hours above the one I saved , as in this case.

I appreciate any help with this problem, I'll be here as long as it takes.

I am using vuejs to create a form that stores data in an array. My problem is that when making a change, it is reflected in the "copies" that exist. I would like to know if there is any way to remove this characteristic of vuejs from being reactive, but only in a specific element. For example if I have my array defined in the data:

miArreglo =[]
otroArreglo = []

Then in a function I do the following:

funcionCualquiera () {
 this.otroArreglo = miArreglo.push()
}

If at some point I deleted what is in miArreglo, the "copy" saved in otroArreglo. Is there any way to avoid this?

Sorry for the question but let me explain:

I understand that a hash function performs one-way operations on an element without the possibility of RETURNING the operation from the result.

A symmetric encryption function allows bi-directional operations based on a key, but allowing me to encrypt and decrypt.

So far so good but I have a doubt if it is possible to have a kind of fusion between the two and thus have an algorithm that encrypts symmetrically but resulting in a unique "hash". In other words, having something that allows me to encrypt a large amount of information based on a key and resulting in a FIXED LENGTH code just like md5 does.

Is this really possible?

Thank you very much.

My problem is the following:

I have a very simple tkinter window, in which I have put a single button. When the user presses this button, a function is executed. This function looks for some files by name and if it doesn't exist it shows a message. The process takes a few minutes, but in the meantime the graphical interface hangs with the famous (not responding). What I need is that while this process is running, the user can continue to use the GUI without problem. I suspect the solution is related to threads but I'm not sure how to do it. Here the code:

from tkinter import *
import os.path
import tkinter as tk
from tkinter import messagebox
import time
def verificacion():
    messagebox.showinfo("Exito", "Todos los archivos existen!!")


def mensajeOmitidos(archivos):
    messagebox.showinfo("Omitido", archivos)


archivos = ["archivo1.py", "archivo2.py", "archivo3.py"]
# Esta es la funcion llamada con el boton
# En este ejemplo no demora mucho, pero el mio
# necesita conectarse a una base de datos por lo que le toma mas tiempo


def funcionConsulta():
    time.sleep(3)
    cont = ""
    for x in archivos:
        if not os.path.isfile(x):
            cont = cont + "," + x
    if len(cont) != 0:
        mensajeOmitidos(cont)
    else:
        verificacion()


raiz = Tk()
raiz.geometry("500x500")
raiz.resizable(width=False, height=False)
botonConsulta = tk.Button(raiz, text="actualizar", command=funcionConsulta)
botonConsulta.grid(row=5, column=5)
raiz.mainloop()

I leave you a screenshot of my test program, at this point it had been like this for 3 minutes.

I must clarify that the test code does not take as long as the original, since in the latter I must connect to a database and do many more things.

I appreciate any help you can give me, I'm waiting.

Well my problem is this:

We are starting to see the topic of sockets and I have these examples:

CLIENT:

import socket
host = "localhost"
port = 9999
socket1 = socket.socket()
socket1.connect((host, port))
try:
    while(True):
        cadena = input("Mensaje para enviar al servidor: ")
        socket1.send(cadena.encode(encoding='utf-8'))
        print("se ha enviado la cadena: ", cadena)
        CadenaRecServidor = socket1.recv(1024).decode('utf-8')
        print("El servidor responde: ", CadenaRecServidor)
except Exception as e:
    print("error", e)
socket1.close()

SERVER:

import socketserver


class     MiTcpHandler(socketserver.BaseRequestHandler):
    def handle(self):
        try:
            self.cadena =     self.request.recv(1024).decode('utf-8')
            print("Cliente:", self.cadena)
            self.CadenaSendServer =     input("Sevidor: ")
            self.request.send(self.CadenaSendServer.encode(
                encoding='utf-8',     errors='strict'))
        except Exception as e:
            print("error", e)


host = "localhost"
port = 9999
server1 = socketserver.TCPServer((host, port), MiTcpHandler)
print("Servidor Corriendo")
server1.serve_forever()

My problem is that when I run them they connect without problems. First I send a message from client to server. I then reply from the server to the client with another message. The problem is that when trying to send a third message from the client again, the program (client only, server if it remains active) quits unexpectedly and displays the following message:

error [VinError 10053] A connection established by software on your host machine has been aborted*

Can someone please help me with this error or who has had experience in these cases. Or at least explain to me why it happens, if I can understand what is happening then I will solve it myself.

Thanks in advance, I'll be here as long as I need.

Hello good, I have a question about how to change parameters to a button in wxpython. Let me explain: I have a window with a drop-down list with some colors and I have a button below that says "OK"

The idea is that the user selects a color from the list and then hits the "OK" button.

If the user selects the white color, a pop-up should open with an error message. If you select any other color the window should be closed. Here the code in python: import wx

class ventana(wx.App):


    def OnInit(self):
        frame = crear_ventana()
        frame.Show(True)
        frame.Centre()
        return True

####SI EL USUARIO SELECCIONA BLANCO Y LE DA OK DEBE APARECER ESTA 
VENTAN:#######


class ventana_error(wx.Dialog):

    def __init__(self, padre):

        wx.Dialog.__init__(self, padre, wx.NewId(),
                           title="Error", size=(300, 100))
        panel = wx.Panel(self, -1)
        boton = wx.Button(panel, label="entendido",
                      pos=(125, 37), size=(70, 25))
        boton.Bind(wx.EVT_BUTTON, self.llamar)
        self.Centre()
        normal = wx.StaticText(
            panel, -1, "Seleccione otro color", pos=(75, 15), style=wx.ALL)
        # self.entrada_texto=wx.TextCtrl(panel,value="",pos=(5,27),size= 
               (5,5),style=wx.TE_LEFT)

    def llamar(self, event):
        self.Close(True)


#################VENTANA PRINCIPAL: ##################

class crear_ventana(wx.Frame):

    def __init__(self):
        wx.Frame.__init__(self, None, -1, title="Seleccione colores", size= 
          (200, 200),
                      pos=(100, 10), style=wx.DEFAULT_FRAME_STYLE & ~ 
  (wx.RESIZE_BORDER | wx.MAXIMIZE_BOX | wx.MINIMIZE_BOX | wx.CLOSE_BOX))
       panel1 = wx.Panel(self, -1)

        boton1 = wx.Button(panel1, label="OK",
                       pos=(50, 100), size=(50, 25))

        opciones = [u"Blanco", u"Rojo", u"Verde"]
        self.opciones = wx.Choice(
           panel1, wx.ID_ANY, choices=opciones, pos=(50, 50), size=(100, 
             25))
    self.opciones.SetSelection(-1)

    #####AQUI ESTA EL PROBLERMA:######
    boton1.Bind(wx.EVT_BUTTON, self.llamar_ventana1)
    # Lo que necesito es cambiar ese llamar_ventana1
    # por llamar_ventana2 pero dependiendo de lo que el
    # usuario seleccione

    dec = self.opciones.Bind(
        wx.EVT_CHOICE, self.Choice)  # esto se me ocurrio
    # pero resulta que solo funciona una vez al ejecutarse
    # tal vez que me devuelva un valor distinto cada vez que
    # el usuario cambie de seleccion
    # dec almacena eso que el usuario selecciona

    print("dec: ")
    print(dec)

    def Choice(self, event):  # Esta es la funcion para verificar lo que se 
    selecciono
      global numerox

       opcion_seleccionada = self.opciones.GetStringSelection()
       opcion_seleccionada_uno = self.opciones.GetSelection()
       print(opcion_seleccionada)
       print(opcion_seleccionada_uno)
       return opcion_seleccionada_uno

     def llamar_ventana1(self, event):  # si el usuario selecciona blanco
        # llamar a esta funcion
        ventana2 = ventana_error(self)
        ventana2.ShowModal()
        ventana2.Destroy()


     def llamar_ventana2(self, event):  # si selecciona otro color llamar a 
          esta funcion
          self.Destroy()


app1 = ventana(0)
app1.MainLoop()

If someone knows how to do that please explain to me. I'll be here all the time thanks :)

Hello, as the question says, what I want to know is if it is possible to load a list of words in an array the way I am doing it. If someone can help me please here is a snippet of the code:

    #include<iostream>
    #include<synchapi.h>
    #include<string.h>
    #include<stdio.h>
    using namespace std;
    int main()
    {
    FILE *cargar_verbos; 
    int c_v=0;// este lo utilizo como contador
    string c__v; // este lo utilizo para cargar la palabra
    cargar_verbos=fopen("verbos_ar.txt","r"); 
    // el siguiente while lo utilizo para saber cuantas palabras hay en el              
    //archivo pues en este punto no tenemos ni idea.
    while(!feof(cargar_verbos))
    {
        fscanf(cargar_verbos,"%s",&c__v);
        c_v++; // por eso uso este contador

    }
    string verbos_ar[c_v]; //declaro el arreglo tipo string y utilizo el 
    //contador para declarar la cantidad



    c_v=0; // paso el contador nuevamente a cero

    while(!feof(cargar_verbos)) // aqui es donde tengo el problema
    {

        fscanf(cargar_verbos,"%s",&verbos_ar[c_v]); // esta es mi duda

        c_v++;

    }
    fclose(cargar_verbos);
    }

As you can see in the part that loads the word in the array I put the counter as indicative and according to me it should store the word without problems but whenever I run the program and it reaches that part it gives me an error. If anyone can help me I would really appreciate it.