socket programming in c# with python - sockets

Question

I am trying to run udp communication by running an external program (python script) in c # and opening the server as a thread.
When data is transfered to the port opened by the Python script, the server(c# program) receivce data.
But, there is no packet that is caught after some data has been sent.
Oddly enough, if i run directly a Python script by turning on the cmd from outside, It works well!
This Strange Phenomenon is observed just when I make python process run in c# program!
I Doubt that send buffer is the cause, but i don't know how to fix it.
I would really appreciate it if you helped me!
Here is my test code!
c# udp server
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Diagnostics;
namespace UdpSocket
{
public partial class Form1 : Form
{
bool used = true;
Thread t1 = null;
Process current_pro = null;
UdpClient srv = null;
public Form1()
{
InitializeComponent();
listView1.View = View.Details;
listView1.FullRowSelect = true;
listView1.GridLines = true;
listView1.Columns.Add("Timeline", 800, HorizontalAlignment.Center);
}
private void udpserverStart()
{
try
{
srv = new UdpClient(5582);
IPEndPoint clientEP = new IPEndPoint(IPAddress.Any, 0);
while (used)
{
byte[] dgram = srv.Receive(ref clientEP);
listView1.Items.Add(Encoding.Default.GetString(dgram));
}
}
catch (Exception e)
{
MessageBox.Show(e.ToString());
}
finally
{
}
}
private void hookStart()
{
ProcessStartInfo proInfo = new ProcessStartInfo();
proInfo.FileName = "python.exe";
proInfo.Arguments = String.Format("-u {0}", #"output.py");
proInfo.CreateNoWindow = true;
proInfo.UseShellExecute = false;
proInfo.RedirectStandardInput = true;
proInfo.RedirectStandardOutput = true;
current_pro = new Process();
current_pro.StartInfo = proInfo;
current_pro.Start();
current_pro.Exited += (sender, e) =>
{
MessageBox.Show("Hook Process exited!");
};
}
private void button1_Click(object sender, EventArgs e)
{
t1 = new Thread(udpserverStart);
t1.Start();
hookStart();
}
private void button2_Click(object sender, EventArgs e)
{
used = false;
srv.Close();
//t1.Join();
t1.Abort();
current_pro.Kill();
this.Close();
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
}
}
and python udp client
sc = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sc.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, 100000)
def message(message, data):
if message['type'] == 'send':
try:
payload = str(message['payload']) + '\n'
sc.sendto(payload.encode(), ('127.0.0.1', 5582))
print(str(message['payload']) + '\n')
except:
print('error');
elif message['type'] == 'error':
try:
print(str(message['stack']) + '\n')
except:
print('error');
else:
print("something...")

Answer 1

I just trying remove redirection code below, and it works well!
proInfo.RedirectStandardInput = true;
proInfo.RedirectStandardOutput = true;