ScreenCapture/MainForm.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ScreenCapture
{
    public partial class MainForm : Form
    {
        private KeyboardHook hook;

        public MainForm()
        {
            InitializeComponent();
            hook = new KeyboardHook(this.Handle);
            hook.KeyPressed += CaptureWindow_Click;
            hook.RegisterHotKey(ModifierKeysWin.Win, Keys.F12);
        }

        protected override void WndProc(ref Message m)
        {
            if (hook != null)
            {
                hook.WndProc(ref m);
            }

            base.WndProc(ref m);
        }

        private void Open()
        {
            Show();

            if (!this.ShowInTaskbar)
                this.ShowInTaskbar = true;

            if (this.WindowState == FormWindowState.Minimized)
                this.WindowState = FormWindowState.Normal;
        }

        private async void CaptureWindow_Click(object sender, EventArgs e)
        {
            ScreenCapture sc = ScreenCapture.Instance;
            sc.CaptureWindow();
            string link = await Web.upload(sc.Stream, sc.FileName);
            sc.Release();

            Clipboard.SetText(link);
            ShowNotification(link);

        }

        private void Close_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            Open();
        }

        private void settingsMenu_Click(object sender, EventArgs e)
        {
            Open();
        }

        private void OnClosing(object sender, FormClosingEventArgs e)
        {
            e.Cancel = true;
            this.ShowInTaskbar = false;
            this.WindowState = FormWindowState.Minimized;
            Hide();
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            Hide();
        }

        private void ShowNotification(string str)
        {
            notifyIcon.BalloonTipText = str;
            notifyIcon.ShowBalloonTip(3000);
        }
    }
}