Screen Capture

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Printing;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace Capture
{

    static class Program
    {
        private const int WH_KEYBOARD_LL = 13;

        private const int WM_KEYDOWN = 0x0100;

        private static LowLevelKeyboardProc _proc = HookCallback;

        private static IntPtr _hookID = IntPtr.Zero;

        private static Resident resi = null;

        [STAThread]
        static void Main()
        {
            resi = new Resident();
            _hookID = SetHook(_proc);
            Application.Run();
            UnhookWindowsHookEx(_hookID);
        }

        private static IntPtr SetHook(LowLevelKeyboardProc proc)
        {
            using (Process curProcess = Process.GetCurrentProcess())
            using (ProcessModule curModule = curProcess.MainModule)
            {
                return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
            }

        }

        private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

        private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
            {
                int vkCode = Marshal.ReadInt32(lParam);

                // 44（Print Screen）のときのみ印刷処理を行う
                if (vkCode == 44)
                {
                    resi.Print();
                }
            }
            return CallNextHookEx(_hookID, nCode, wParam, lParam);
        }

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool UnhookWindowsHookEx(IntPtr hhk);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string lpModuleName);

    }

    public partial class Resident : Form
    {
        public Resident()
        {
            this.ShowInTaskbar = false;
            this.SetComponents();
        }

        /// <summary>
        /// タスクトレイのメニュー処理（アプリの終了）
        /// </summary>
        /// <param name="sendar"></param>
        /// <param name="e"></param>
        private void Close_Click(object sendar, EventArgs e)
        {
            Application.Exit();
        }

        /// <summary>
        /// アプリの設定
        /// </summary>
        private void SetComponents()
        {
            NotifyIcon icon = new NotifyIcon();
            icon.Icon = Properties.Resources.Icon1;

            icon.Visible = true;
            icon.Text = "アプリテスト";

            ContextMenuStrip menu = new ContextMenuStrip();
            ToolStripMenuItem menuItem = new ToolStripMenuItem();
            menuItem.Text = "&終了";
            menuItem.Click += new EventHandler(Close_Click);
            menu.Items.Add(menuItem);
            icon.ContextMenuStrip = menu;
        }

        /// <summary>
        /// 印刷処理の実施
        /// </summary>
        public void Print()
        {
            CaptureScreen();

            PrintDocument pd = new PrintDocument();
            pd.PrintPage += new PrintPageEventHandler(ReadImage);
            pd.OriginAtMargins = false;
            pd.DefaultPageSettings.Landscape = true;
            pd.Print();
        }

        /// <summary>
        /// キャプチャ画像を作る
        /// </summary>
        private void CaptureScreen()
        {
            Bitmap bm = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
            Graphics g = Graphics.FromImage(bm);
            g.CopyFromScreen(new Point(0, 0), new Point(0, 0), bm.Size);

            bm.Save("image.bmp", ImageFormat.Bmp);
            g.Dispose();
        }

        /// <summary>
        /// 印刷する画像の縮尺を行う
        /// </summary>
        /// <param name="sendar"></param>
        /// <param name="e"></param>
        private void ReadImage(object sendar, PrintPageEventArgs e)
        {
            //拡大率を指定．
            float zoom = 1;
            float padding = 20;

            Image image = Image.FromFile("image.bmp");

            if (image.Width > e.Graphics.VisibleClipBounds.Width)
            {
                zoom = e.Graphics.VisibleClipBounds.Width / image.Width;
            }
            if ((image.Height + padding) * zoom > e.Graphics.VisibleClipBounds.Height)
            {
                zoom = e.Graphics.VisibleClipBounds.Height / (image.Height + padding);
            }

            e.Graphics.DrawImage(image, 0, padding, image.Width * zoom, image.Height * zoom);
            image.Dispose();
        }
    }
}