Knx

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using GlobalHotkeys;

namespace ScreenSnap
{
    public partial class Main : Form
    {
        #region SUBCLASS
        #region API
        /// <summary>
        /// Helper class containing User32 API functions
        /// </summary>
        private class User32
        {
            public enum WindowState
            {
                SW_SHOWNORMAL = 1,
                SW_SHOWMINIMIZED = 2,
                SW_SHOWMAXIMIZED = 3
            }
            [StructLayout(LayoutKind.Sequential)]
            public struct WINDOWPLACEMENT
            {
                public int length;
                public int flags;
                public int showCmd;
                public System.Drawing.Point ptMinPosition;
                public System.Drawing.Point ptMaxPosition;
                public System.Drawing.Rectangle rcNormalPosition;
            }
            [StructLayout(LayoutKind.Sequential)]
            public struct RECT
            {
                public int left;
                public int top;
                public int right;
                public int bottom;
            }
            [DllImport("user32.dll")]
            public static extern int GetForegroundWindow();
            [DllImport("user32.dll")]
            public static extern IntPtr GetDesktopWindow();
            [DllImport("user32.dll")]
            public static extern IntPtr GetWindowDC(IntPtr hWnd);
            [DllImport("user32.dll")]
            public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);
            [DllImport("user32.dll")]
            public static extern bool GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
            [DllImport("user32.dll")]
            public static extern IntPtr GetWindowRect(IntPtr hWnd, ref RECT rect);
        }
        #endregion
        #endregion

        #region METHODS
        #region CONSTRUCTORS
        public Main()
        {
            InitializeComponent();

            GlobalHotkey.RegisterHotKey(this, Keys.PrintScreen, 0);
            Keys k = Keys.PrintScreen | Keys.Alt;
            GlobalHotkey.RegisterHotKey(this, k, 1);

            TextBoxFolder.Text = Application.StartupPath;
        }
        #endregion

        /// <summary>
        /// Take screenshot
        /// </summary>
        /// <param name="Width"></param>
        /// <param name="Height"></param>
        /// <param name="X"></param>
        /// <param name="Y"></param>
        /// <returns>Image captured</returns>
        public Image ImageCapture(int Width, int Height, int X, int Y)
        {
            this.Opacity = 0;
            Rectangle ScreenBounds = new Rectangle(X, Y, Width, Height);
            Bitmap Screenshot = new Bitmap(ScreenBounds.Width, ScreenBounds.Height, PixelFormat.Format32bppArgb);
            Graphics ScreenGraph = Graphics.FromImage(Screenshot);
            ScreenGraph.CopyFromScreen(ScreenBounds.X, ScreenBounds.Y, 0, 0, ScreenBounds.Size, CopyPixelOperation.SourceCopy);
            Image Img = (Image)Screenshot;
            this.Opacity = 100;
            Clipboard.SetImage(Img);
            return Img;
        }

        /// <summary>
        /// Save image to file
        /// </summary>
        /// <param name="Img"></param>
        public void ImageSave(Image Img)
        {
            if (Directory.Exists(TextBoxFolder.Text))
            {
                string Name = TextBoxFolder.Text + @"\" + TextBoxFileName.Text + (DateTime.Now.ToFileTime()) + ".jpg";
                Img.Save(Name, ImageFormat.Jpeg);
            }
            else
                MessageBox.Show("Invalid folder", "Error");
        }

        /// <summary>
        /// Capture full screen image
        /// </summary>
        public void ScreenshotFull()
        {
            ImageSave(ImageCapture(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height,
                    Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y));
        }

        /// <summary>
        /// Capture window image
        /// </summary>
        public void ScreenshotWindow()
        {
            int hWnd = User32.GetForegroundWindow();
            User32.RECT bounds = new User32.RECT();
            User32.GetWindowRect((IntPtr)hWnd, ref bounds);
            int width = bounds.right - bounds.left;
            int height = bounds.bottom - bounds.top;
            User32.WINDOWPLACEMENT wp = new User32.WINDOWPLACEMENT();
            User32.GetWindowPlacement((IntPtr)hWnd, ref wp);
            int x;
            int y;

            if (wp.showCmd == (int)User32.WindowState.SW_SHOWMAXIMIZED)
            {
                x = wp.ptMaxPosition.X;
                y = wp.ptMaxPosition.Y;
            }
            else
            {
                x = wp.rcNormalPosition.X;
                y = wp.rcNormalPosition.Y;
            }

            if ((x + width) > Screen.PrimaryScreen.WorkingArea.Width)
                width = width - ((x + width) - Screen.PrimaryScreen.WorkingArea.Width);

            if ((y + height) > Screen.PrimaryScreen.WorkingArea.Height)
                height = height - ((y + height) - Screen.PrimaryScreen.WorkingArea.Height);

            ImageSave(ImageCapture(width, height, x, y));
        }
        #endregion

        #region EVENTS
        #region GLOBAL KEYS
        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);

            if (m.Msg == GlobalHotkey.WM_HOTKEY)
            {
                switch (m.WParam.ToInt32())
                {
                    case 0:
                        try
                        {
                            ScreenshotFull();
                        }
                        catch
                        {
                            MessageBox.Show("Unknow error!", "Error");
                        }
                        break;
                    case 1:
                        try
                        {
                            ScreenshotWindow();
                        }
                        catch
                        {
                            MessageBox.Show("Unknow error!", "Error");
                        }
                        break;
                }
            }
        }
        #endregion

        private void ButtonScreenshot_Click(object sender, EventArgs e)
        {
            try
            {
                ScreenshotFull();
            }
            catch
            {
                MessageBox.Show("Unknow error!", "Error");
            }
        }

        private void ButtonFolderBrowse_Click(object sender, EventArgs e)
        {
            if (FolderBrowserDialogSave.ShowDialog() == DialogResult.OK)
                TextBoxFolder.Text = FolderBrowserDialogSave.SelectedPath;
        }
        #endregion
    }
}