ScreenExtender/PcWin/ScreenExtenderClient/SxdCliMainForm.cs

using System;
using System.Drawing;
using System.IO;
using System.Net.Http;
using System.Windows.Forms;

namespace ScreenExtenderClient
{
    public partial class SxdCliMainForm : Form
    {
        private Image _image;
        private Exception _lastException;

        public SxdCliMainForm()
        {
            InitializeComponent();
            if (Program.Args.Count > 1) SxdClVwPanel.Text = Program.Args[1];
        }

        private void UpdateTimer_Tick(object sender, EventArgs e)
        {
            var old = _image;
            try
            {
                var cl = new HttpClient();
                var httpResponseMessage = cl.GetAsync(Program.Args[0]).Result;
                var bytes = httpResponseMessage.Content.ReadAsByteArrayAsync().Result;
                var ms = new MemoryStream(bytes);
                _image = Image.FromStream(ms);
                _lastException = null;
            }
            catch (Exception exception)
            {
                _lastException = exception;
                Console.WriteLine(exception);
                _image = null;
            }
            old?.Dispose();
            SxdClVwPanel.Invalidate();
        }

        private void SxdClVwPanel_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.Clear(BackColor);
            if (_image != null) e.Graphics.DrawImage(_image, Point.Empty);
            if (_lastException != null) ControlPaint.DrawStringDisabled(e.Graphics, _lastException.ToString(), Font, ForeColor, new Rectangle(0, 0, SxdClVwPanel.Width, SxdClVwPanel.Height), new StringFormat());
        }
    }
}